/************************************************* * Exim - an Internet mail transport agent * *************************************************/ /* Copyright (c) University of Cambridge 1995 - 1999 */ /* See the file NOTICE for conditions of use and distribution. */ /* The main function: entry point, initialization, and high-level control. */ #include "exim.h" /************************************************* * Function interface to store functions * *************************************************/ /* We need some real functions to pass to the PCRE regular expression library for store allocation via Exim's store manager. The normal calls are actually macros that pass over location information to make tracing easier. These functions just interface to the standard macro calls. A good compiler will optimize out the tail recursion and so not make them too expensive. There are two sets of functions; one for use when we want to retain the compiled regular expression for a long time; the other for short-term use. */ static void * function_store_get(size_t size) { return store_get((int)size); } static void function_dummy_free(void *block) { block = block; } static void * function_store_malloc(size_t size) { return store_malloc((int)size); } static void function_store_free(void *block) { store_free(block); } /************************************************* * Compile regular expression and panic on fail * *************************************************/ /* This function is called when failure to compile a regular expression leads to a panic exit. In other cases, pcre_compile() is called directly. In many cases where this function is used, the results of the compilation are to be placed in long-lived store, so we temporarily reset the store management functions that PCRE uses if the use_malloc flag is set. Argument: pattern the pattern to compile use_malloc TRUE if compile into malloc store Returns: pointer to the compiled pattern */ pcre * regex_must_compile(char *pattern, BOOL use_malloc) { int offset; pcre *yield; const char *error; if (use_malloc) { pcre_malloc = function_store_malloc; pcre_free = function_store_free; } yield = pcre_compile(pattern, PCRE_COPT, &error, &offset, NULL); pcre_malloc = function_store_get; pcre_free = function_dummy_free; if (yield == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: " "%s at offset %d while compiling %s", error, offset, pattern); return yield; } /************************************************* * Execute regular expression and set strings * *************************************************/ /* This function runs a regular expression match, and sets up the pointers to the matched substrings. Arguments: re the compiled expression subject the subject string options additional PCRE options setup if < 0 do full setup if >= 0 setup from setup+1 onwards, excluding the full matched string Returns: TRUE or FALSE */ BOOL regex_match_and_setup(pcre *re, char *subject, int options, int setup) { int ovector[3*(EXPAND_MAXN+1)]; int n = pcre_exec(re, NULL, subject, (int)strlen(subject), PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int)); BOOL yield = n >= 0; if (n == 0) n = EXPAND_MAXN + 1; if (yield) { int nn; expand_nmax = (setup < 0)? 0 : setup + 1; for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2) { expand_nstring[expand_nmax] = subject + ovector[nn]; expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn]; } expand_nmax--; } return yield; } /************************************************* * Timeout handler * *************************************************/ /* This is called from various parts of the code when a timeout is required that must just set a flag on expiry. This is typically used to place a time limit on a system call of some kind. There are some other SIGALRM handlers that are used in special cases when more than just a flag setting is required; they are normally in the code module that uses them. Argument: the signal value (SIGALRM) Returns: nothing */ void sigalrm_handler(int sig) { sig = sig; /* Keep picky compilers happy */ sigalrm_seen = TRUE; } /************************************************* * Handler for SIGUSR1 * *************************************************/ /* SIGUSR1 causes any exim process to write to the process log details of what it is currently doing. It will only be used if the OS is capable of setting up a handler that causes automatic restarting of any system call that is in progress at the time. Argument: the signal number (SIGUSR1) Returns: nothing */ static void usr1_handler(int sig) { sig = sig; /* Keep picky compilers happy */ log_write(0, LOG_PROCESS, "%s", process_info); log_close_all(); os_restarting_signal(SIGUSR1, usr1_handler); } /************************************************* * Set up processing details * *************************************************/ /* Save a text string for dumping when SIGUSR1 is received. Do checks for overruns. Arguments: format and arguments, as for printf() Returns: nothing */ void set_process_info(char *format, ...) { int len; va_list ap; sprintf(process_info, "%5d %.12s ", (int)getpid(), version_string); len = strlen(process_info); va_start(ap, format); if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap)) strcpy(process_info + len, "**** string overflowed buffer ****"); DEBUG(2) debug_printf("set_process_info: %s\n", process_info); va_end(ap); } /************************************************* * Entry point and high-level code * *************************************************/ /* Entry point for the Exim mailer. Analyse the arguments and arrange to take the appropriate action. All the necessary functions are present in the one binary. I originally thought one should split it up, but it turns out that so much of the apparatus is needed in each chunk that one might as well just have it all available all the time, which then makes the coding easier as well. Arguments: argc count of entries in argv argv argument strings, with argv[0] being the program name Returns: EXIT_SUCCESS if terminated successfully EXIT_FAILURE otherwise, except when a message has been sent to the sender, and -oee was given */ int main(int argc, char **argv) { int arg_accept_timeout = -1; int arg_error_handling = error_handling; int filter_fd = -1; int group_count; int i; int list_queue_option = 0; int message_count = 0; int msg_action = 0; int msg_action_arg = -1; int namelen = (argv[0] == NULL)? 0 : (int)strlen(argv[0]); int queue_only_reason = 0; #ifdef EXIM_PERL int perl_start_option = 0; #endif int recipients_arg = argc; int sender_address_domain = 0; int test_retry_arg = -1; int test_rewrite_arg = -1; BOOL arg_queue_only = FALSE; BOOL arg_queue_remote = FALSE; BOOL arg_queue_smtp= FALSE; BOOL bi_option = FALSE; BOOL checking = FALSE; BOOL extract_recipients = FALSE; BOOL forced_delivery = FALSE; BOOL deliver_give_up = FALSE; BOOL is_inetd = FALSE; BOOL list_queue = FALSE; BOOL list_variables = FALSE; BOOL local_queue_only; BOOL more = TRUE; BOOL one_msg_action = FALSE; BOOL queue_only_set = FALSE; BOOL queue_remote_set = FALSE; BOOL queue_smtp_set = FALSE; BOOL synchronous_delivery = FALSE; BOOL verify_as_sender = FALSE; BOOL version_printed = FALSE; char *alias_arg = NULL; char *called_as = ""; char *start_queue_run_id = NULL; char *stop_queue_run_id = NULL; char *ftest_domain = NULL; char *ftest_localpart = NULL; char *ftest_prefix = NULL; char *ftest_suffix = NULL; BOOL ftest_system = FALSE; transport_instance *ti; void *reset_point; struct passwd *pw; struct stat statbuf; pid_t passed_qr_pid = (pid_t)0; gid_t group_list[NGROUPS_MAX]; #if HAVE_IPV6 struct sockaddr_in6 inetd_sock; #else struct sockaddr inetd_sock; #endif /* Ensure we have a buffer for constructing log entries. Use malloc directly, because store_malloc writes a log entry on failure. */ log_buffer = (char *)malloc(LOG_BUFFER_SIZE); if (log_buffer == NULL) { fprintf(stderr, "exim: failed to get store for log buffer\n"); exit(EXIT_FAILURE); } /* Set log_stderr to stderr, provided that stderr exists. This gets reset to NULL when the daemon is run and all the file descriptors are closed. We have to use this indirection, because some systems don't allow writing to the variable "stderr". */ if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr; /* Arrange for the PCRE regex library to use our store functions. Note that the normal calls are actually macros that add additional arguments for debugging purposes so we have to assign specially constructed functions here. The default is to use store in the stacking pool, but this is overridden in the regex_must_compile() function. */ pcre_malloc = function_store_get; pcre_free = function_dummy_free; /* Ensure there is a big buffer for temporary use in several places. It is put in malloc store so that it can be freed for enlargement if necessary. */ big_buffer = store_malloc(big_buffer_size); /* Set up the handler for the data request signal, and set the initial descriptive text. */ set_process_info("initializing"); os_restarting_signal(SIGUSR1, usr1_handler); /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate in the daemon code. For the rest of exim's uses, we ignore it. */ signal(SIGHUP, SIG_IGN); /* We don't want to die on pipe errors as the code is written to handle the write error instead. */ signal(SIGPIPE, SIG_IGN); /* Under some circumstance on some OS, Exim can get called with SIGCHLD set to SIG_IGN. This causes subprocesses that complete before the parent process waits for them not to hang around, so when Exim calls wait(), nothing is there. The wait() code has been made robust against this, but let's ensure that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process ending status. */ signal(SIGCHLD, SIG_DFL); /* Save the arguments for use if we re-exec exim as a daemon after receiving SIGHUP. */ sighup_argv = argv; /* Set up the version number. Set up the leading 'E' for the external form of message ids, set the pointer to the internal form, and initialize it to indicate no message being processed. */ version_init(); message_id_option[0] = '-'; message_id_external = message_id_option + 1; message_id_external[0] = 'E'; message_id = message_id_external + 1; message_id[0] = 0; /* Set the umask to zero so that any files that Exim creates are created with the modes that it specifies. */ umask(0); /* Precompile the regular expression for matching a message id. Keep this in step with the code that generates ids in the accept.c module. We need to do this here, because the -M options check their arguments for syntactic validity using mac_ismsgid, which uses this. */ regex_ismsgid = regex_must_compile("^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", TRUE); /* Precompile the regular expression for matching SIZE and DSN parameters in the response to an EHLO command. */ regex_SIZE = regex_must_compile("\\n250[\\s\\-]SIZE(\\s|\\n|$)", TRUE); #ifdef SUPPORT_DSN regex_DSN = regex_must_compile("\\n250[\\s\\-]DSN(\\s|\\n|$)", TRUE); #endif /* If the program is called as "mailq" treat it as equivalent to "exim -bp"; this seems to be a generally accepted convention, since one finds symbolic links called "mailq" in standard OS configurations. */ if ((namelen == 5 && strcmp(argv[0], "mailq") == 0) || (namelen > 5 && strncmp(argv[0] + namelen - 6, "/mailq", 6) == 0)) { list_queue = TRUE; called_as = "-mailq"; } /* If the program is called as "rmail" treat it as equivalent to "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode, i.e. preventing a single dot on a line from terminating the message, and returning with zero return code, even in cases of error (provided an error message has been sent). */ if ((namelen == 5 && strcmp(argv[0], "rmail") == 0) || (namelen > 5 && strncmp(argv[0] + namelen - 6, "/rmail", 6) == 0)) { dot_ends = FALSE; called_as = "-rmail"; errors_sender_rc = EXIT_SUCCESS; } /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS"; this is a smail convention. */ if ((namelen == 5 && strcmp(argv[0], "rsmtp") == 0) || (namelen > 5 && strncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0)) { smtp_input = smtp_batched_input = TRUE; called_as = "-rsmtp"; } /* If the program is called as "runq" treat it as equivalent to "exim -q"; this is a smail convention. */ if ((namelen == 4 && strcmp(argv[0], "runq") == 0) || (namelen > 4 && strncmp(argv[0] + namelen - 5, "/runq", 5) == 0)) { queue_interval = 0; called_as = "-runq"; } /* If the program is called as "newaliases" treat it as equivalent to "exim -bi"; this is a sendmail convention. */ if ((namelen == 10 && strcmp(argv[0], "newaliases") == 0) || (namelen > 10 && strncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0)) { bi_option = TRUE; called_as = "-newaliases"; } /* Get the real uid and gid. If the caller is root, force the effective uid/gid to be the same as the real ones. This makes a difference only if Exim is setuid (or setgid) to something other than root, which could be the case in some special configurations. */ real_uid = getuid(); real_gid = getgid(); if (real_uid == root_uid) { mac_seteuid(real_uid); mac_setegid(real_gid); } /* Scan the program's arguments. Some can be dealt with right away; others are simply recorded for checking and handling afterwards. Do a high-level switch on the second character (the one after '-'), to save some effort. */ for (i = 1; i < argc; i++) { BOOL badarg = FALSE; char *arg = argv[i]; /* Handle flagged options */ if (arg[0] == '-') { int switchchar = arg[1]; char *argrest = arg+2; /* Make all -ex options synonymous with -oex arguments, since that is assumed by various callers. Also make -qR options synonymous with -R options, as that seems to be required as well. Allow for -qqR too. */ if (strncmp(arg+1, "oe", 2) == 0 || strncmp(arg+1, "qR", 2) == 0) { switchchar = arg[2]; argrest++; } else if (strncmp(arg+1, "qqR", 3) == 0) { switchchar = arg[3]; argrest += 2; queue_2stage = TRUE; } /* Make -r synonymous with -f, since it is a documented alias */ else if (arg[1] == 'r') switchchar = 'f'; /* Make -ov synonymous with -v */ else if (strcmp(arg, "-ov") == 0) { switchchar = 'v'; argrest++; } /* An option consistion of -- terminates the options */ else if (strcmp(arg, "--") == 0) { recipients_arg = i + 1; break; } /* High-level switch on active initial letter */ switch(switchchar) { case 'b': /* -bd: Run in daemon mode, awaiting SMTP connections. */ if (strcmp(argrest, "d") == 0) daemon_listen = TRUE; /* -bf: Run in mail filter testing mode -bfd: Set domain for filter testing -bfl: Set local part for filter testing -bfp: Set prefix for filter testing -bfs: Set suffix for filter testing */ else if (*argrest == 'f' || *argrest == 'F') { ftest_system = *argrest++ == 'F'; if (*argrest == 0) { if(++i < argc) filter_test = argv[i]; else { fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]); exit(EXIT_FAILURE); } } else { if (++i >= argc) { fprintf(stderr, "exim: string expected after %s\n", arg); exit(EXIT_FAILURE); } if (strcmp(argrest, "d") == 0) ftest_domain = argv[i]; else if (strcmp(argrest, "l") == 0) ftest_localpart = argv[i]; else if (strcmp(argrest, "p") == 0) ftest_prefix = argv[i]; else if (strcmp(argrest, "s") == 0) ftest_suffix = argv[i]; else { badarg = TRUE; break; } } } /* -bh: Host checking - an IP address must follow. */ else if (strcmp(argrest, "h") == 0) { if (++i >= argc) { badarg = TRUE; break; } if(!string_is_ip_address(argv[i])) { fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", argv[i]); exit(EXIT_FAILURE); } sender_host_address = argv[i]; host_checking = checking = TRUE; } /* -bi: This option is used by sendmail to initialise *the* alias file, though it has the -oA option to specify a different file. Exim has no concept of *the* alias file, but since Sun's YP make script calls sendmail this way, some support must be provided. */ else if (strcmp(argrest, "i") == 0) bi_option = TRUE; /* -bm: Accept and deliver message - the default option. */ else if (strcmp(argrest, "m") == 0) continue; /* -bpxx: List the contents of the mail queue, in various forms. If the first letter after p is r, then order is random. */ else if (*argrest == 'p') { if (*(++argrest) == 'r') { list_queue_option = 8; argrest++; } else list_queue_option = 0; /* -bp: List the contents of the mail queue, top-level only */ if (*argrest == 0) list_queue = TRUE; /* -bpu: List the contents of the mail queue, top-level undelivered */ else if (strcmp(argrest, "u") == 0) { list_queue = TRUE; list_queue_option += 1; } /* -bpa: List the contents of the mail queue, including all delivered */ else if (strcmp(argrest, "a") == 0) { list_queue = TRUE; list_queue_option += 2; } /* Unknown after -bp[r] */ else { badarg = TRUE; break; } } /* -bP: List the configuration variables given as the address list. Force -v, so configuration errors get displayed. */ else if (strcmp(argrest, "P") == 0) { list_variables = TRUE; if (debug_level <= 0) debug_level = 1; debug_file = stderr; } /* -brt: Test retry configuration lookup */ else if (strcmp(argrest, "rt") == 0) { test_retry_arg = i + 1; goto END_ARG; } /* -brw: Test rewrite configuration */ else if (strcmp(argrest, "rw") == 0) { test_rewrite_arg = i + 1; goto END_ARG; } /* -bS: Read SMTP commands on standard input, but produce no replies - all errors are reported by sending messages. */ else if (strcmp(argrest, "S") == 0) smtp_input = smtp_batched_input = TRUE; /* -bs: Read SMTP commands on standard input and produce SMTP replies on standard output. */ else if (strcmp(argrest, "s") == 0) smtp_input = TRUE; /* -bt: address testing mode */ else if (strcmp(argrest, "t") == 0) address_test_mode = checking = TRUE; /* -bv: verify addresses */ else if (strcmp(argrest, "v") == 0) verify_only = checking = TRUE; /* -bvs: verify sender addresses */ else if (strcmp(argrest, "vs") == 0) { verify_only = checking = TRUE; verify_as_sender = TRUE; } /* -bV: Print version string */ else if (strcmp(argrest, "V") == 0) { printf("Exim version %s #%s built %s\n", version_string, version_cnumber, version_date); printf("%s\n", version_copyright); version_printed = TRUE; } else badarg = TRUE; break; /* -C: change configuration file; ignore if it isn't really a change! */ case 'C': if (*argrest == 0) { if(++i < argc) argrest = argv[i]; else { badarg = TRUE; break; } } if (strcmp(config_filename, argrest) != 0) { config_filename = argrest; config_changed = TRUE; } break; /* -D: set up a macro definition */ case 'D': { int ptr = 0; macro_item *mlast = NULL; macro_item *m; char name[24]; char *s = argrest; if (*s == 0) { if(++i < argc) s = argv[i]; else { badarg = TRUE; break; } } while (isalnum(*s) || *s == '_') { if (ptr < sizeof(name)-1) name[ptr++] = *s; s++; } name[ptr] = 0; while (isspace(*s)) s++; if (*s == 0) { if(++i < argc) s = argv[i]; else { badarg = TRUE; break; } } if (*s++ != '=') { badarg = TRUE; break; } if (*s == 0) { if(++i < argc) s = argv[i]; else { badarg = TRUE; break; } } for (m = macros; m != NULL; m = m->next) { if (strcmp(m->name, name) == 0) { fprintf(stderr, "exim: duplicated -D in command line\n"); exit(EXIT_FAILURE); } mlast = m; } m = store_get(sizeof(macro_item) + (int)strlen(name)); m->next = NULL; m->command_line = TRUE; if (mlast == NULL) macros = m; else mlast->next = m; strcpy(m->name, name); m->replacement = string_copy(s); if (clmacro_count >= MAX_CLMACROS) { fprintf(stderr, "exim: too many -D options on command line\n"); exit(EXIT_FAILURE); } clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name, m->replacement); } break; /* -d: Set debug level (see also -v below) or set memory tracing, or set up stderr to a file, or set the drop_cr option. */ case 'd': if (strcmp(argrest, "m") == 0) { debug_trace_memory = TRUE; if (debug_level < 1) debug_level = 1; } else if (strcmp(argrest, "ropcr") == 0) drop_cr = TRUE; else if (strcmp(argrest, "f") == 0) { if (*stderr_filename != 0) freopen(stderr_filename, "a", stderr); } else if (*argrest == 0 && (i+1 >= argc || !isdigit(argv[i+1][0]))) debug_level = 1; else { int n = 0; char *s = (*argrest == 0)? argv[++i] : argrest; (void)sscanf(s, "%d%n", &debug_level, &n); if (n+2 < (int)strlen(arg)) badarg = TRUE; } if (debug_level > 0 && !badarg) { debug_file = stderr; debug_printf("Exim version %s debug level %d uid=%d gid=%d\n", version_string, debug_level, real_uid, real_gid); #ifdef DB_VERSION_STRING debug_printf("Berkeley DB: %s\n", DB_VERSION_STRING); #elif defined(BTREEVERSION) && defined(HASHVERSION) #ifdef USE_DB debug_printf("probably Berkeley DB version 1.8x (native mode)\n"); #else debug_printf("probably Berkeley DB version 1.8x (compatibility mode)\n"); #endif #elif defined(_DBM_RDONLY) || defined(dbm_dirfno) debug_printf("probably ndbm\n"); #else debug_printf("probably GDBM\n"); #endif } break; /* -E: This is a local error message. This option is not intended for external use at all, but is not restricted to trusted callers because it does no harm (just suppresses certain error messages) and if exim is run not setuid root it won't always be trusted when it generates error messages using this option. If there is a message id following -E, point message_reference at it, for logging. */ case 'E': local_error_message = TRUE; if (mac_ismsgid(argrest)) message_reference = argrest; break; /* -ex: The vacation program calls sendmail with the undocumented "-eq" option, so it looks as if historically the -oex options are also callable without the leading -o. So we have to accept them. Before the switch, anything starting -oe has been converted to -e. Exim does not support all of the sendmail error options. */ case 'e': if (strcmp(argrest, "e") == 0) { arg_error_handling = ERRORS_SENDER; errors_sender_rc = EXIT_SUCCESS; } else if (strcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER; else if (strcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR; else if (strcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR; else if (strcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER; else badarg = TRUE; break; /* -F: Set sender's full name, used instead of the gecos entry from the password file. Since users can usually alter their gecos entries, there's no security involved in using this instead. The data can follow the -F or be in the next argument. */ case 'F': if (*argrest == 0) { if(++i < argc) argrest = argv[i]; else { badarg = TRUE; break; } } user_name = argrest; break; /* -f: Set sender's address - only actually used if run by a trusted user, except that the null address can be set by any user. For an untrusted user it is used only as the envelope address for outgoing SMTP and to prevent mail being sent from a filter; the actual sender is still put in Sender: if it doesn't match the From: header. The data can follow the -f or be in the next argument. The -r switch is an obsolete form of -f but since there appear to be programs out there that use anything that sendmail ever supported, better accept it - the synonymizing is done before the switch above. */ case 'f': { int start, end; char *errmess; if (*argrest == 0) { if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; } } sender_address = parse_extract_address(argrest, &errmess, &start, &end, &sender_address_domain, TRUE); if (sender_address == NULL) { fprintf(stderr, "exim: %s - bad address: %s\n", argrest, errmess); return EXIT_FAILURE; } sender_address_forced = TRUE; } break; /* -h: Set the hop count for an incoming message. Exim does not currently support this; it always computes it by counting the Received: headers. To put it in will require a change to the spool header file format. */ case 'h': if (*argrest == 0) { if(++i < argc) argrest = argv[i]; else { badarg = TRUE; break; } } if (!isdigit(*argrest)) badarg = TRUE; break; /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems not to be documented for sendmail but mailx (at least) uses it) */ case 'i': if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE; break; case 'M': /* -MC: continue delivery of another message via an existing open file descriptor. This option is used for an internal call by the smtp transport when there is a pending message waiting to go to an address to which it has got a connection. The caller is required to be root. Four subsequent arguments are required: transport name, host name, sequence number, and message_id. Transports may decline to create new processes if the sequence number gets too big. The channel is stdin + stdout. This must be the last argument. There's a subsequent check that the real-uid is privileged. */ if (strcmp(argrest, "C") == 0) { if (argc != i + 5) { fprintf(stderr, "exim: too many or too few arguments after -MC\n"); return EXIT_FAILURE; } if (msg_action_arg >= 0) { fprintf(stderr, "exim: incompatible arguments\n"); return EXIT_FAILURE; } continue_transport = argv[++i]; continue_hostname = argv[++i]; continue_sequence = atoi(argv[++i]); msg_action = MSG_DELIVER; msg_action_arg = ++i; forced_delivery = TRUE; queue_run_pid = passed_qr_pid; if (!mac_ismsgid(argv[i])) { fprintf(stderr, "exim: malformed message id %s after -MC option\n", argv[i]); return EXIT_FAILURE; } break; } /* -MCD: set the smtp_use_dsn flag; this is useful only when it precedes -MC (see above) */ #ifdef SUPPORT_DSN else if (strcmp(argrest, "CD") == 0) { smtp_use_dsn = TRUE; break; } #endif /* -MCQ: pass on the pid of the queue-running process that started this chain of deliveries; this is useful only when it precedes -MC (see above) */ else if (strcmp(argrest, "CQ") == 0) { if(++i < argc) passed_qr_pid = (pid_t)(atol(argv[i])); else badarg = TRUE; break; } /* -MCS: set the smtp_use_size flag; this is useful only when it precedes -MC (see above) */ else if (strcmp(argrest, "CS") == 0) { smtp_use_size = TRUE; break; } /* -M[x]: various operations on the following list of message ids: -M deliver the messages, ignoring next retry times -Mc deliver the messages, checking next retry times -Mf freeze the messages -Mg give up on the messages -Mt thaw the messages -Mrm remove the messages In the above cases, this must be the last option. There are also the following options which are followed by a single message id, and which act on that message. Some of them use the "recipient" addresses as well. -Mar add recipient(s) -Mmad mark all recipients delivered -Mmd mark recipients(s) delivered -Mes edit sender -Meb edit body -Mvb show body -Mvh show header -Mvl show log */ else if (*argrest == 0) { msg_action = MSG_DELIVER; forced_delivery = TRUE; } else if (strcmp(argrest, "ar") == 0) { msg_action = MSG_ADD_RECIPIENT; one_msg_action = TRUE; } else if (strcmp(argrest, "c") == 0) msg_action = MSG_DELIVER; else if (strcmp(argrest, "eb") == 0) { msg_action = MSG_EDIT_BODY; one_msg_action = TRUE; } else if (strcmp(argrest, "es") == 0) { msg_action = MSG_EDIT_SENDER; one_msg_action = TRUE; } else if (strcmp(argrest, "f") == 0) msg_action = MSG_FREEZE; else if (strcmp(argrest, "g") == 0) { msg_action = MSG_DELIVER; deliver_give_up = TRUE; } else if (strcmp(argrest, "mad") == 0) { msg_action = MSG_MARK_ALL_DELIVERED; } else if (strcmp(argrest, "md") == 0) { msg_action = MSG_MARK_DELIVERED; one_msg_action = TRUE; } else if (strcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE; else if (strcmp(argrest, "t") == 0) msg_action = MSG_THAW; else if (strcmp(argrest, "vb") == 0) { msg_action = MSG_SHOW_BODY; one_msg_action = TRUE; } else if (strcmp(argrest, "vh") == 0) { msg_action = MSG_SHOW_HEADER; one_msg_action = TRUE; } else if (strcmp(argrest, "vl") == 0) { msg_action = MSG_SHOW_LOG; one_msg_action = TRUE; } else { badarg = TRUE; break; } /* All the -Mxx options require at least one message id. */ msg_action_arg = i + 1; if (msg_action_arg >= argc) { fprintf(stderr, "exim: no message ids given after %s option\n", arg); return EXIT_FAILURE; } /* Some require only message ids to follow */ if (!one_msg_action) { int j; for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j])) { fprintf(stderr, "exim: malformed message id %s after %s option\n", argv[j], arg); return EXIT_FAILURE; } goto END_ARG; /* Remaining args are ids */ } /* Others require only one message id, possibly followed by addresses, which will be handled as normal arguments. */ else { if (!mac_ismsgid(argv[msg_action_arg])) { fprintf(stderr, "exim: malformed message id %s after %s option\n", argv[msg_action_arg], arg); return EXIT_FAILURE; } i++; } break; /* Some programs seem to call the -om option without the leading o; for sendmail it askes for "me too". Exim always does this. */ case 'm': if (*argrest != 0) badarg = TRUE; break; /* -N: don't do delivery - a debugging option that stops transports doing their thing. It implies debugging. */ case 'N': if (*argrest == 0) { dont_deliver = TRUE; if (debug_level <= 0) { debug_level = 1; debug_file = stderr; } } else badarg = TRUE; break; case 'o': /* -oA: Set an argument for the bi command (sendmail's "alternate alias file" option). */ if (*argrest == 'A') { alias_arg = argrest + 1; if (alias_arg[0] == 0) { if (i+1 < argc) alias_arg = argv[++i]; else { fprintf(stderr, "exim: string expected after -oA\n"); exit(EXIT_FAILURE); } } } /* -oB: Set a batch max value for (at present only SMTP) remote deliveries */ else if (*argrest == 'B') { char *p = argrest + 1; if (p[0] == 0) { if (i+1 < argc && isdigit(argv[i+1][0])) p = argv[++i]; else { batch_max = 1; p = NULL; } } if (p != NULL) { if (!isdigit(*p)) { fprintf(stderr, "exim: number expected after -oB\n"); exit(EXIT_FAILURE); } batch_max = atoi(p); } } /* -odb: background delivery */ else if (strcmp(argrest, "db") == 0) { synchronous_delivery = FALSE; arg_queue_only = FALSE; queue_only_set = TRUE; } /* -odf: foreground delivery (smail-compatible option); same effect as -odi: interactive (synchronous) delivery (sendmail-compatible option) */ else if (strcmp(argrest, "df") == 0 || strcmp(argrest, "di") == 0) { synchronous_delivery = TRUE; arg_queue_only = FALSE; queue_only_set = TRUE; } /* -odq: queue only */ else if (strcmp(argrest, "dq") == 0) { synchronous_delivery = FALSE; arg_queue_only = TRUE; queue_only_set = TRUE; } /* -odqr: queue remote addresses only - do local deliveries */ else if (strcmp(argrest, "dqr") == 0) { arg_queue_remote = TRUE; queue_remote_set = TRUE; } /* -odqs: queue SMTP only - do local deliveries and remote routing, but no remote delivery */ else if (strcmp(argrest, "dqs") == 0) { arg_queue_smtp = TRUE; queue_smtp_set = TRUE; } /* -oex: Sendmail error flags. As these are also accepted without the leading -o prefix, for compatibility with vacation and other callers, they are handled with -e above. */ /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i) */ else if (strcmp(argrest, "i") == 0) dot_ends = FALSE; /* -oM*: Set various characteristics for an incoming message; actually acted on for root or exim only. */ else if (*argrest == 'M') { if (i+1 >= argc) { fprintf(stderr, "exim: data expected after -o%s\n", argrest); exit(EXIT_FAILURE); } /* -oMa: Set sender host address (root or exim only) */ if (strcmp(argrest, "Ma") == 0) sender_host_address = argv[++i]; /* -oMr: Received protocol (root or exim only) */ else if (strcmp(argrest, "Mr") == 0) received_protocol = argv[++i]; /* -oMs: Set sender host name (root or exim only) */ else if (strcmp(argrest, "Ms") == 0) sender_host_name = argv[++i]; /* -oMt: Set sender ident (root or exim only) */ else if (strcmp(argrest, "Mt") == 0) sender_ident = argv[++i]; /* Else a bad argument */ else { badarg = TRUE; break; } } /* -om: Me-too flag for aliases. Exim always does this. Some programs seem to call this as -m (undocumented), so that is also accepted (see above). */ else if (strcmp(argrest, "m") == 0) {} /* -or : set timeout for non-SMTP acceptance */ else if (*argrest == 'r') { if (argrest[1] == 0) { if (i+1 < argc) arg_accept_timeout = readconf_readtime(argv[++i], 0); } else arg_accept_timeout = readconf_readtime(argrest + 1, 0); if (arg_accept_timeout < 0) { fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]); exit(EXIT_FAILURE); } } /* -oX : Set SMTP listening port to */ else if (strcmp(argrest, "X") == 0) smtp_port = atoi(argv[++i]); else badarg = TRUE; break; /* -ps: force Perl startup; -pd force delayed Perl startup */ #ifdef EXIM_PERL case 'p': if (*argrest == 's' && argrest[1] == 0) perl_start_option = 1; else if (*argrest == 'd' && argrest[1] == 0) perl_start_option = -1; else badarg = TRUE; break; #endif case 'q': /* -qq...: Do queue runs in a 2-stage manner */ if (*argrest == 'q') { queue_2stage = TRUE; argrest++; } /* -qf...: Run the queue, forcing deliveries */ if (*argrest == 'f') { queue_run_force = TRUE; argrest++; } /* -q[f]l...: Run the queue only on local deliveries */ if (*argrest == 'l') { queue_run_local = TRUE; argrest++; } /* -q[f][l]: Run the queue, optionally forced, optionally local only, optionally starting from a given message id. */ if (*argrest == 0 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1]))) { queue_interval = 0; if (i+1 < argc && mac_ismsgid(argv[i+1])) start_queue_run_id = argv[++i]; if (i+1 < argc && mac_ismsgid(argv[i+1])) stop_queue_run_id = argv[++i]; } /* -q[f][l]: Run the queue at regular intervals, optionally forced, optionally local only. */ else { if (*argrest != 0) queue_interval = readconf_readtime(argrest, 0); else queue_interval = readconf_readtime(argv[++i], 0); if (queue_interval <= 0) { fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]); exit(EXIT_FAILURE); } } break; case 'R': /* Synonymous with -qR... */ /* -Rf: As -R (below) but force all deliveries, provided there are no further characters in this argument. */ if (*argrest == 'f' && argrest[1] == 0) { queue_run_force = TRUE; argrest++; } /* -R: Set string to match in addresses for forced queue run to pick out particular messages. */ if (*argrest == 0) { if (i+1 < argc) deliver_selectstring = argv[++i]; else { fprintf(stderr, "exim: string expected after -R\n"); exit(EXIT_FAILURE); } } else deliver_selectstring = argrest; if (queue_interval < 0) queue_interval = 0; break; /* -r: an obsolete synonym for -f (see above) */ /* -t: Set flag to extract recipients from body of message. */ case 't': if (*argrest == 0) extract_recipients = TRUE; else badarg = TRUE; break; /* -v: verify things - this is the same as -d or -d1. */ case 'v': if (*argrest == 0) { if (debug_level <= 0) { debug_level = 1; debug_file = stderr; } } else badarg = TRUE; break; /* -x: AIX uses this to indicate some fancy 8-bit character stuff: The -x flag tells the sendmail command that mail from a local mail program has National Language Support (NLS) extended characters in the body of the mail item. The sendmail command can send mail with extended NLS characters across networks that normally corrupts these 8-bit characters. As Exim is 8-bit clean, it just ignores this flag. */ case 'x': if (*argrest != 0) badarg = TRUE; break; /* All other initial characters are errors */ default: badarg = TRUE; break; } /* End of high-level switch statement */ /* Failed to recognize the option, or syntax error */ if (badarg) { fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete " "option %s\n", arg); exit(EXIT_FAILURE); } } /* End of handling of args starting with '-' */ /* An argument not starting with '-' is the start of a recipients list; break out of the argument-scanning loop. */ else { recipients_arg = i; break; } } /* Arguments have been processed. Check for incompatibilities. */ END_ARG: if (( (smtp_input || extract_recipients || recipients_arg < argc) && (daemon_listen || queue_interval >= 0 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0 || filter_test != NULL || (msg_action_arg > 0 && !one_msg_action)) ) || ( msg_action_arg > 0 && (daemon_listen || queue_interval >= 0 || list_variables || checking || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0) ) || ( (daemon_listen || queue_interval >= 0) && (sender_address != NULL || list_variables || list_queue || checking || bi_option) ) || ( daemon_listen && queue_interval == 0 ) || ( list_variables && (checking || smtp_input || extract_recipients || filter_test != NULL || bi_option) ) || ( verify_only && (address_test_mode || smtp_input || extract_recipients || filter_test != NULL || bi_option) ) || ( address_test_mode && (smtp_input || extract_recipients || filter_test != NULL || bi_option) ) || ( smtp_input && (sender_address != NULL || filter_test != NULL || extract_recipients) ) || ( deliver_selectstring != NULL && queue_interval < 0 ) ) { fprintf(stderr, "exim: incompatible command-line options or arguments\n"); exit(EXIT_FAILURE); } /* Exim is normally entered as root (but some special configurations are possible that don't do this). The security level controls how it uses set{u,g}id and/or sete{g,u}id to reduce its privilege when not necessary. However, it always spins off sub-processes that set their uid and gid as required for local delivery. We don't want to pass on any extra groups that root may belong to, so we want to get rid of them all at this point. We need to obey setgroups() at this stage, before possibly giving up root privilege for a changed configuration file, but later on we might need to check on the additional groups for the admin user privilege - can't do that till after reading the config, which might specify the exim gid. Therefore, save the group list here first. */ group_count = getgroups(NGROUPS_MAX, group_list); /* Save the original effective uid for a couple of uses later. It should normally be root, but in some esoteric environments it may not be. */ original_euid = geteuid(); /* There is a fundamental difference in some BSD systems in the matter of groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are known not to be different. On the "different" systems there is a single group list, and the first entry in it is the current group. On all other versions of Unix there is a supplementary group list, which is in *addition* to the current group. Consequently, to get rid of all extraneous groups on a "standard" system you pass over 0 groups to setgroups(), while on a "different" system you pass over a single group - the current group, which is always the first group in the list. Calling setgroups() with zero groups on a "different" system results in an error return. The following code should cope with both types of system. However, if this process isn't running as root, setgroups() can't be used, since you have to be root to run it, even if throwing away groups. Not being root here happens only in some unusual configurations. We just ignore the error. */ if (setgroups(0, NULL) != 0) { if (setgroups(1, group_list) != 0 && original_euid == root_uid) { fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno)); exit(EXIT_FAILURE); } } /* If the configuration file name has been altered by an argument on the command line (either a new file name or a macro definition) and the caller is not root or the exim user, or if this is a filter testing run, remove any setuid privilege the program has, and run as the underlying user. Otherwise, set the real ids to the effective values (should be root unless run from inetd, which it can either be root or the exim uid, if one is configured). When running with the security options set, root privilege will subsequently be relinquished as soon as possible. */ if (((config_changed || macros != NULL) && real_uid != root_uid && (!exim_uid_set || real_uid != exim_uid)) || filter_test != NULL) { setgid(real_gid); /* Sets real and effective */ setuid(real_uid); really_exim = FALSE; /* To stop any attempts at log writing */ DEBUG(9) debug_printf("Removed setuid privilege: uid=%d gid=%d euid=%d " "egid=%d\n", getuid(), getgid(), geteuid(), getegid()); } else { setgid(getegid()); setuid(geteuid()); } /* If testing a filter, open the file now, before wasting time doing other setups and reading the message. */ if (filter_test != NULL) { filter_fd = open(filter_test, O_RDONLY); if (filter_fd < 0) { fprintf(stderr, "exim: failed to open %s: %s\n", filter_test, strerror(errno)); return EXIT_FAILURE; } } /* Read the main runtime configuration data; this gives up if there is a failure. It leaves the configuration file open so that the subsequent configuration data for delivery can be read if needed. */ readconf_main(); /* Start up Perl interpreter if Perl support is configured and there is a perl_startup option, and the configuration or the command line specifies initializing starting. Note that the global variables are actually called opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */ #ifdef EXIM_PERL if (perl_start_option != 0) opt_perl_at_start = (perl_start_option > 0); if (opt_perl_at_start && opt_perl_startup != NULL) { char *errstr; DEBUG(9) debug_printf("Starting Perl interpreter\n"); errstr = init_perl(opt_perl_startup); if (errstr != NULL) { fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr); return EXIT_FAILURE; } opt_perl_started = TRUE; } #endif /* EXIM_PERL */ /* Log the arguments of the call if the configuration file said so. This is a debugging feature for finding out what arguments certain MUAs actually use. Don't attempt it if logging is disabled, or if listing variables or if verifying/testing addresses. */ if (log_arguments && really_exim && !list_variables && !checking) { int i; char *p = big_buffer; sprintf(big_buffer, "%d args:", argc); while (*p) p++; for (i = 0; i < argc; i++) { int len = (int)strlen(argv[i]); if (p + len + 8 >= big_buffer + big_buffer_size) { strcpy(p, " ..."); log_write(0, LOG_MAIN, "%s", big_buffer); strcpy(big_buffer, "..."); p = big_buffer + 3; } sprintf(p, " %.*s", big_buffer_size - (p - big_buffer) - 2, string_printing(argv[i])); while (*p) p++; } log_write(0, LOG_MAIN, "%s", big_buffer); } /* Handle calls with the -bi option. This is a sendmail option to rebuild *the* alias file. Exim doesn't have such a concept, but this call is screwed into Sun's YP makefiles. Handle this by calling a configured script, as the real user who called Exim. The -oA option can be used to pass an argument to the script. */ if (bi_option) { if (bi_command != NULL) { int i = 0; char *argv[3]; argv[i++] = bi_command; if (alias_arg != NULL) argv[i++] = alias_arg; argv[i++] = NULL; setgid(real_gid); setuid(real_uid); DEBUG(2) debug_printf("exec %.256s %.256s\n", argv[0], (argv[1] == NULL)? "" : argv[1]); execv(argv[0], argv); fprintf(stderr, "exim: exec failed: %s\n", strerror(errno)); exit(EXIT_FAILURE); } else { DEBUG(2) debug_printf("-bi used but bi_command not set; exiting\n"); exit(EXIT_SUCCESS); } } /* Build the argument list for calling Exim to send an error message. */ mailer_argv = store_get((13 + MAX_CLMACROS) * (sizeof(char *))); mailer_argv[0] = exim_path; mailer_argv[1] = "-t"; mailer_argv[2] = "-oem"; mailer_argv[3] = "-oi"; mailer_argv[4] = "-f"; mailer_argv[5] = "<>"; /* Set up the -E option to give the current message id, if any. If debugging is turned on, arrange to pass the setting when we re-exec exim for error messages, etc. Also pass on -N if set (-d is always set if -N is.) The argument list has several 0 entries at the end, all but the last of which can be overwritten. */ mailer_argv[6] = message_id_option; i = 7; if (debug_level > 0) { mailer_argv[i++] = string_sprintf("-d%d", debug_level); if (dont_deliver) mailer_argv[i++] = "-N"; } /* Ensure any alternate configuration file and macro settings are passed on. */ if (config_changed) { mailer_argv[i++] = "-C"; mailer_argv[i++] = config_filename; } if (clmacro_count > 0) { memcpy(mailer_argv + i, clmacros, clmacro_count * sizeof(char *)); i += clmacro_count; } /* Terminate the argument list */ mailer_argv[i] = (char *)0; /* If an SMTP message is being received and the uid is root or exim, check to see whether this is a call from inetd by looking for a peername. We do this early, while still root, so that we can also call os_getloadavg() if required, because some OS need the first call to os_getloadavg() to be done while root, in order to open a kernel file. The socket information is kept available for use later. The case is necessary for the case of an IPv6 socket. */ if (smtp_input && (real_uid == root_uid || (exim_uid_set && real_uid == exim_uid))) { int size = sizeof(inetd_sock); if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0) is_inetd = TRUE; } /* If the load average is going to be needed while receiving a message, get it now, because some OS require the first call to os_getloadavg() to be done as root. What a pain. */ if ((is_inetd && smtp_load_reserve >= 0) || (queue_only_load >= 0 && (smtp_input || extract_recipients || (recipients_arg < argc && !checking)))) load_average = os_getloadavg(); /* If an action on specific messages is requested, or if a daemon or queue runner is being started, we need to know if Exim was called by an admin user. This is the case if the real user is root or exim, or if the real group is exim, or if one of the supplementary groups is exim. Note: this is not the same as "trusted user" status. We don't fail all message actions immediately if not admin_user, since some actions can be performed by others. Instead, set admin_user for later interrogation. */ if (real_uid == root_uid || (exim_uid_set && real_uid == exim_uid) || (exim_gid_set && real_gid == exim_gid)) admin_user = TRUE; else if (exim_gid_set) { while (--group_count >= 0) if (group_list[group_count] == exim_gid) { admin_user = TRUE; break; } } /* Only an admin user may start the daemon or force a queue run in the default configuration, but the queue run restriction can be relaxed. Only an admin user may request that a message be returned to its sender forthwith. */ if (!admin_user && (deliver_give_up || daemon_listen || (queue_interval >= 0 && prod_requires_admin))) { fprintf(stderr, "exim: permission denied\n"); exit(EXIT_FAILURE); } /* Set the working directory to be the top-level spool directory. We don't rely on this in the code, which always uses fully qualified names, but it's useful for core dumps etc. Don't complain if it fails - the spool directory might not be generally accessible and calls with the -C option have lost privilege by now. */ if (chdir(spool_directory) != 0) { directory_make(spool_directory, "", SPOOL_DIRECTORY_MODE, TRUE); (void) chdir(spool_directory); } /* If the real user is not root or the exim uid, the argument for passing in an open TCP/IP connection for another message is not permitted, nor is running with the -N option for any delivery action, unless this call to exim is one that supplied an input message. */ if (real_uid != root_uid && (!exim_uid_set || real_uid != exim_uid) && (continue_hostname != NULL || (dont_deliver && (queue_interval >= 0 || daemon_listen || msg_action_arg > 0) ) )) { fprintf(stderr, "exim: Permission denied\n"); return EXIT_FAILURE; } /* See if the caller is root or exim or is in the list of trusted uids or gids. Trusted callers are permitted to specify sender addresses with -f on the command line. */ if (real_uid == root_uid || (exim_uid_set && real_uid == exim_uid)) trusted_caller = TRUE; else { int i; if (trusted_users != NULL) { for (i = 1; i <= (int)(trusted_users[0]); i++) if (trusted_users[i] == real_uid) { trusted_caller = TRUE; break; } } if (!trusted_caller && trusted_groups != NULL) { for (i = 1; i <= (int)(trusted_groups[0]); i++) if (trusted_groups[i] == real_gid) { trusted_caller = TRUE; break; } } } /* If the caller is not trusted, certain arguments are ignored. Note that authority for performing certain actions on messages is tested in the queue_action() function. */ if (!trusted_caller && !host_checking) { sender_host_name = sender_host_address = sender_ident = NULL; received_protocol = NULL; } /* The queue_only configuration option can be overridden by -odx on the command line, the queue_smtp configuration option can be overridden by -odbs, the queue_remote configuration option can be overridden by -odqr, and the accept_timeout option can be overridden by -or. */ if (queue_only_set) queue_only = arg_queue_only; if (queue_smtp_set) queue_smtp = arg_queue_smtp; if (queue_remote_set) queue_remote = arg_queue_remote; if (arg_accept_timeout >= 0) accept_timeout = arg_accept_timeout; /* If an exim uid is specified, handle setuid/seteuid setting according to the security level. The macros mac_setegid and mac_seteuid are defined as -1 on systems which do not have seteuid and setegid, so that this code will compile on all systems. However, the security level won't be set to values that cause the use of the sete{u,g}id functions on systems that don't have them (see readconf.c). */ if (exim_uid_set) { /* Level 1: Use seteuid to reduce privilege at all times it is not needed, but use setuid if we know that privilege is never going to be required again, typically for enquiry type calls. However, privilege might be needed for the forwardfile director, so can't lose it for verification. */ if (security_level == 1) { if (queue_interval < 0 && /* not running the queue */ !daemon_listen && /* and not starting the daemon */ (msg_action_arg < 0 || msg_action != MSG_DELIVER) && /* and not delivering */ (!checking || host_checking) && /* and not checking address */ (list_variables || /* and either not receiving */ (recipients_arg >= argc && !extract_recipients && !smtp_input) || queue_only)) /* or just queueing */ { setgid(exim_gid); setuid(exim_uid); } /* Running the queue, starting daemon, delivering, or receiving with queue_only FALSE. */ else { mac_setegid(exim_gid); mac_seteuid(exim_uid); } } /* Level 2: if neither starting the daemon nor delivering messages, verifying, or testing an address, always use setuid to remove all root privilege. Level 2 makes no use of the sete{g,u}id functions; subsequent re-execs are used to regain root privilege for delivering. Level 3: as level 2, but in addition use sete{g,u}id at other times. */ else { if (queue_interval < 0 && /* not running the queue */ !daemon_listen && /* and not starting the daemon */ (msg_action_arg < 0 || msg_action != MSG_DELIVER) && /* and not delivering */ (!checking || host_checking)) /* and not checking address */ { setgid(exim_gid); setuid(exim_uid); } /* Level 3 */ else if (security_level > 2) { mac_setegid(exim_gid); mac_seteuid(exim_uid); } } } /* Handle a request to list the delivery queue */ if (list_queue) { set_process_info("listing the queue"); queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg); exit(EXIT_SUCCESS); } /* Handle actions on specific messages, except for the force delivery action, which is done below. Some actions take a whole list of message ids, which are known to continue up to the end of the arguments. Others take a single message id and then operate on the recipients list. */ if (msg_action_arg > 0 && msg_action != MSG_DELIVER) { int yield = EXIT_SUCCESS; set_process_info("acting on specified messages"); if (!one_msg_action) { for (i = msg_action_arg; i < argc; i++) if (!queue_action(argv[i], msg_action, NULL, 0, 0)) yield = EXIT_FAILURE; } else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc, recipients_arg)) yield = EXIT_FAILURE; exit(yield); } /* All the modes below here require the delivery configuration options to be set up. Doing it here saves effort when several processes are subsequently spun off. */ transport_init(); direct_init(); route_init(); readconf_retries(); readconf_rewrites(); fclose(config_file); /* Handle the -brt option. This is for checking out retry configurations. The next three arguments are a domain name or a complete address, and optionally two error numbers. All it does is to call the function that scans the retry configuration data. */ if (test_retry_arg >= 0) { retry_config *yield; int basic_errno = 0; int more_errno = 0; char *s1, *s2; if (test_retry_arg >= argc) { printf("-brt needs a domain or address argument\n"); return EXIT_FAILURE; } s1 = argv[test_retry_arg++]; s2 = NULL; /* If the first argument contains no @ and no . it might be a local user or it might be a single-component name. Treat as a domain. */ if (strchr(s1, '@') == NULL && strchr(s1, '.') == NULL) { printf("Warning: \"%s\" contains no '@' and no '.' characters. It is " "being \ntreated as a one-component domain, not as a local part.\n\n", s1); } /* There may be an optional second domain arg. */ if (test_retry_arg < argc && strchr(argv[test_retry_arg], '.') != NULL) s2 = argv[test_retry_arg++]; /* The final arg is an error name */ if (test_retry_arg < argc) { char *ss = argv[test_retry_arg]; char *error = readconf_retry_error(ss, ss + (int)strlen(ss), &basic_errno, &more_errno); if (error != NULL) { printf("%s\n", error); return EXIT_FAILURE; } } yield = retry_find_config(s1, s2, basic_errno, more_errno); if (yield == NULL) printf("No retry information found\n"); else { retry_rule *r; more_errno = yield->more_errno; printf("Retry rule: %s ", yield->destination); if (yield->basic_errno == ERRNO_EXIMQUOTA) { printf("quota%s%s ", (more_errno > 0)? "_" : "", (more_errno > 0)? readconf_printtime(more_errno) : ""); } else if (yield->basic_errno == ECONNREFUSED) { printf("refused%s%s ", (more_errno > 0)? "_" : "", (more_errno == 'M')? "MX" : (more_errno == 'A')? "A" : ""); } else if (yield->basic_errno == ETIMEDOUT) { printf("timeout%s%s ", (more_errno > 0)? "_" : "", (more_errno =='D')? "DNS" : (more_errno == 'C')? "connect" : ""); } for (r = yield->rules; r != NULL; r = r->next) { printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */ printf(",%s", readconf_printtime(r->p1)); /* amalgamate */ if (r->rule == 'G') { int x = r->p2; int f = x % 1000; int d = 100; printf(",%d.", x/1000); do { printf("%d", f/d); f %= d; d /= 10; } while (f != 0); } printf("; "); } printf("\n"); } return EXIT_SUCCESS; } /* Handle a request to list one or more configuration variables */ if (list_variables) { set_process_info("listing variables"); if (recipients_arg >= argc) readconf_print("all", NULL); else for (i = recipients_arg; i < argc; i++) { if (i < argc - 1 && (strcmp(argv[i], "director") == 0 || strcmp(argv[i], "router") == 0 || strcmp(argv[i], "transport") == 0)) { readconf_print(argv[i+1], argv[i]); i++; } else readconf_print(argv[i], NULL); } exit(EXIT_SUCCESS); } /* Ensure the address of the mailmaster is fully qualified. Don't use rewrite_address_qualify, as that frees the input store, and errors_address may not be in dynamic store. */ if (strchr(errors_address, '@') == NULL) errors_address = string_sprintf("%s@%s", errors_address, qualify_domain_sender); /* Search the configured transports for the assumed ones that will be used for generated pipe, file, and directory addresses and auto replies. If they are not found, do not complain now. A complaint will be generated later if an address actually causes a pipe, file, directory or auto-reply delivery to be generated. We also have to sort out any configured transports for pipes, files, etc. from the system filter. If they are not found, the defaults are used. */ for (ti = transports; ti != NULL; ti = ti->next) { char *name = ti->name; if (strcmp(name, address_pipe_transport) == 0) transport_address_pipe = ti; else if (strcmp(name, address_file_transport) == 0) transport_address_file = ti; else if (strcmp(name, address_reply_transport) == 0) transport_address_reply = ti; else if (strcmp(name, address_directory_transport) == 0) transport_address_directory = ti; else if (strcmp(name, address_directory2_transport) == 0) transport_address_directory2 = ti; if (message_filter_pipe_transport != NULL && strcmp(name, message_filter_pipe_transport) == 0) transport_message_filter_pipe = ti; else if (message_filter_file_transport != NULL && strcmp(name, message_filter_file_transport) == 0) transport_message_filter_file = ti; else if (message_filter_reply_transport != NULL && strcmp(name, message_filter_reply_transport) == 0) transport_message_filter_reply = ti; else if (message_filter_directory_transport != NULL && strcmp(name, message_filter_directory_transport) == 0) transport_message_filter_directory = ti; else if (message_filter_directory2_transport != NULL && strcmp(name, message_filter_directory2_transport) == 0) transport_message_filter_directory2 = ti; } /* Handle a request to deliver one or more messages that are already on the queue. Values of msg_action other than MSG_DELIVER are dealt with above. This is typically used for a small number when prodding by hand (when the option forced_delivery will be set) or when re-execing to regain root privilege. Each message delivery must happen in a separate process, so we fork a process for each one, and run them sequentially so that debugging output doesn't get intertwined, and to avoid spawning too many processes if a long list is given. However, don't fork for the last one; this saves a process in the common case when Exim is called to deliver just one message. */ if (msg_action_arg > 0) { if (prod_requires_admin && !admin_user) { fprintf(stderr, "exim: Permission denied\n"); return EXIT_FAILURE; } set_process_info("delivering specified messages"); if (deliver_give_up) forced_delivery = TRUE; if (forced_delivery) queue_smtp = queue_remote = FALSE; for (i = msg_action_arg; i < argc; i++) { int status; if (i == argc - 1) (void)deliver_message(argv[i], forced_delivery, FALSE, deliver_give_up); else if (fork() == 0) { (void)deliver_message(argv[i], forced_delivery, FALSE, deliver_give_up); _exit(EXIT_SUCCESS); } else wait(&status); } exit(EXIT_SUCCESS); } /* If only a single queue run is requested, without SMTP listening, we can just turn into a queue runner, with an optional starting message id. */ if (queue_interval == 0 && !daemon_listen) { DEBUG(1) debug_printf("Single queue run%s%s%s%s\n", (start_queue_run_id == NULL)? "" : " starting at ", (start_queue_run_id == NULL)? "" : start_queue_run_id, (stop_queue_run_id == NULL)? "" : " stopping at ", (stop_queue_run_id == NULL)? "" : stop_queue_run_id); set_process_info("running the queue (single queue run)"); queue_run(start_queue_run_id, stop_queue_run_id, FALSE); exit(EXIT_SUCCESS); } /* Find the login name of the real user running this process. This is always needed, because it is written into the spool file. It may also be used to construct a from: or a sender: header, and in this case we need the user's full name as well, so save a copy of it, checked for RFC822 syntax and munged if necessary, if it hasn't previously been set by the -F argument. We try to get the passwd entry more than once, in case NIS or other delays are in evidence. */ user_login = NULL; for (i = 1; i <= 10; i++) { if ((pw = getpwuid(real_uid)) != NULL) { user_login = string_copy(pw->pw_name); /* If user name has not been set by -F, set it from the passwd entry unless -f has been used to set the sender address by a trusted user. */ if (user_name == NULL) { if (sender_address == NULL || (!trusted_caller && filter_test == NULL)) { char *name = pw->pw_gecos; char *amp = strchr(name, '&'); char buffer[256]; /* Most Unix specify that a '&' character in the gecos field is replaced by a copy of the login name, and some even specify that the first character should be upper cased, so that's what we do. */ if (amp != NULL) { int loffset; string_format(buffer, sizeof(buffer), "%.*s%n%s%s", amp - name, name, &loffset, user_login, amp + 1); buffer[loffset] = toupper(buffer[loffset]); name = buffer; } /* If a pattern for matching the gecos field was supplied, apply it and then expand the name string. */ if (gecos_pattern != NULL && gecos_name != NULL) { pcre *re; re = regex_must_compile(gecos_pattern, TRUE); /* Uses malloc store */ if (regex_match_and_setup(re, name, 0, -1)) { char *new_name = expand_string(gecos_name); expand_nmax = -1; if (new_name != NULL) { DEBUG(4) debug_printf("user name \"%s\" extracted from " "gecos field \"%s\"\n", new_name, name); name = new_name; } else DEBUG(4) debug_printf("failed to expand gecos_name string " "\"%s\": %s\n", gecos_name, expand_string_message); } else DEBUG(4) debug_printf("gecos_pattern \"%s\" did not match " "gecos field \"%s\"\n", gecos_pattern, name); store_free(re); } user_name = string_copy(name); } /* A trusted caller has used -f but not -F */ else user_name = ""; } /* Break the retry loop */ break; } sleep(1); } /* If we cannot get a user login, log the incident and give up, unless the configuration specifies something to use. */ if (user_login == NULL) { if (unknown_login != NULL) { user_login = expand_string(unknown_login); if (user_name == NULL && unknown_username != NULL) user_name = expand_string(unknown_username); if (user_name == NULL) user_name = ""; } if (user_login == NULL) log_write(0, LOG_PANIC_DIE, "Failed to get user name for uid %d", (int)real_uid); } /* Ensure that the user name is in a suitable form for use as a "phrase" in an RFC822 address. NB big_buffer is used by parse_fix_phrase(). */ user_name = string_copy(parse_fix_phrase(user_name)); /* When operating on spool files, the following are the variables that are used, so set them here so the standard code can be used to write a header file. */ originator_login = user_login; originator_uid = real_uid; originator_gid = real_gid; /* Handle the -brw option, which is for checking out rewriting rules. Cause log writes (on errors) to go to stderr instead. Can't do this earlier, as want the originator_* variables set. */ if (test_rewrite_arg >= 0) { really_exim = FALSE; if (test_rewrite_arg >= argc) { printf("-brw needs an address argument\n"); return EXIT_FAILURE; } rewrite_test(argv[test_rewrite_arg]); return EXIT_SUCCESS; } /* Run in daemon and/or queue-running mode. The function daemon_go() never returns. */ if (daemon_listen || queue_interval > 0) daemon_go(); /* If a non-trusted user supplies a sender address of "<>", then this has the effect of setting the user_null_sender flag, which affects the MAIL FROM command on outgoing SMTP, handling of the MAIL command in filters, setting of the Return_Path header in delivered messages, and the sending of warning messages, but is otherwise ignored. */ if (sender_address != NULL && sender_address[0] == 0 && !trusted_caller) user_null_sender = TRUE; /* If the user running this process is not trusted, or if a trusted caller did not supply a sender address with a -f argument for the non-smtp interface, then the sender is local and the address is the user running the process. However, allow anybody to use -f when testing filter files, or doing address tests (which might involve tests on the sender in the drivers). */ if ((sender_address == NULL && !smtp_input) || (!trusted_caller && filter_test == NULL && !verify_only && !address_test_mode)) { sender_local = TRUE; sender_address = user_login; sender_address_forced = FALSE; sender_address_domain = 0; } /* If the user running this process is trusted and has supplied a sender address with a -f argument, or is passing in the message via SMTP and the sending host address has been set (inetd invocation or otherwise), the sender is not considered to be local. */ else sender_local = FALSE; /* Ensure that the sender address is fully qualified unless it is the empty address, which indicates an error message, or doesn't exist (root caller, smtp interface, no -f argument). */ if (sender_address != NULL && sender_address_domain == 0 && sender_address[0] != 0 && sender_address[0] != '@') sender_address = string_sprintf("%s@%s", sender_address, qualify_domain_sender); DEBUG(9) debug_printf("sender address = %s\n", sender_address); /* Handle a request to verify a list of addresses. Must follow the setting of the sender address, since drivers can now be predicated upon the sender. */ if (verify_only) { int exit_value = 0; int flags = vopt_local | (verify_as_sender? 0 : vopt_is_recipient); if (recipients_arg >= argc) { fprintf(stderr, "exim: no addresses given for verification\n"); return EXIT_FAILURE; } DEBUG(9) debug_printf("Verifying: uid=%d gid=%d euid=%d egid=%d\n", getuid(), getgid(), geteuid(), getegid()); for (i = recipients_arg; i < argc; i++) { char *s = argv[i]; while (*s != 0) { int rc; BOOL finished = FALSE; char *ss = parse_find_address_end(s, FALSE); if (*ss == ',') *ss = 0; else finished = TRUE; rc = verify_address(s, stdout, NULL, NULL, flags); if (rc == FAIL) exit_value = 2; else if (rc == DEFER && exit_value == 0) exit_value = 1; s = ss; if (!finished) while (*(++s) != 0 && (*s == ',' || isspace(*s))); } } direct_tidyup(); route_tidyup(); search_tidyup(); exit(exit_value); } /* Handle the case of address test mode - if no arguments are given, read addresses from stdin. Set debug_level to at least 1 to get full output. */ if (address_test_mode) { int exit_value = 0; if (debug_level <= 0) { debug_level = 1; debug_file = stderr; } DEBUG(9) debug_printf("Address testing: uid=%d gid=%d euid=%d egid=%d\n", getuid(), getgid(), geteuid(), getegid()); if (recipients_arg < argc) { while (recipients_arg < argc) { char *s = argv[recipients_arg++]; while (*s != 0) { int rc; BOOL finished = FALSE; char *ss = parse_find_address_end(s, FALSE); if (*ss == ',') *ss = 0; else finished = TRUE; rc = verify_address(string_copy(s), stdout, NULL, NULL, vopt_is_recipient | vopt_local); if (rc == FAIL) exit_value = 2; else if (rc == DEFER && exit_value == 0) exit_value = 1; s = ss; if (!finished) while (*(++s) != 0 && (*s == ',' || isspace(*s))); } } } else { for (;;) { int rc; char buffer[256]; printf("> "); if (fgets(buffer, 256, stdin) == NULL) break; rc = verify_address(string_copy(buffer), stdout, NULL, NULL, vopt_is_recipient | vopt_local); if (rc == FAIL) exit_value = 2; else if (rc == DEFER && exit_value == 0) exit_value = 1; } printf("\n"); } direct_tidyup(); route_tidyup(); search_tidyup(); exit(exit_value); } /* Handle host checking: this facility mocks up an incoming SMTP call from a given IP address so that the blocking and relay configuration can be tested. */ if (host_checking) { host_build_sender_fullhost(); smtp_input = TRUE; smtp_in = stdin; smtp_out = stdout; sender_local = FALSE; sender_host_notsocket = TRUE; debug_file = stderr; fprintf(stdout, "\n**** SMTP testing session as if from host %s\n" "**** Not for real!\n\n", sender_host_address); if (smtp_start_session()) { reset_point = store_get(0); for (;;) { store_reset(reset_point); if (smtp_setup_msg() <= 0) break; (void)accept_msg(smtp_in, smtp_out, FALSE); } } exit(EXIT_SUCCESS); } /* Arrange for message reception if recipients or SMTP were specified; otherwise complain unless a version print happened or this is a filter verification test. */ if (recipients_arg >= argc && !extract_recipients && !smtp_input) { if (version_printed) return EXIT_SUCCESS; if (filter_test == NULL) { fprintf(stderr, "exim: neither action flags nor mail addresses given\n"); return EXIT_FAILURE; } } /* Accept one or more new messages on the standard input; accept_msg returns TRUE if there are more messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel collapsed). When a message has been read, its id is returned in message_id[]. If doing immediate delivery, we fork a delivery process for each received message, except for the last one, where we can save a process switch. */ /* If the sender ident has not been set (by a trusted caller) set it to the caller. This will get overwritten below for an inetd call. If a trusted caller has set it empty, unset it. */ if (sender_ident == NULL) sender_ident = (user_login != NULL)? user_login : string_sprintf("uid%d", (int)real_uid); else if (sender_ident[0] == 0) sender_ident = NULL; /* It is only in non-smtp mode that error_handling is allowed to be changed from its default of ERRORS_SENDER by argument. (Idle thought: are any of the sendmail error modes other than -oem ever actually used? Later: yes.) */ if (!smtp_input) error_handling = arg_error_handling; /* If this is an inetd call, set up the host address and make an identd call to get the sender_ident. Also ensure that stderr is NULL to prevent panic logging being sent down the socket. */ else if (is_inetd) { fclose(stderr); sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock), NULL); verify_get_ident(0); host_build_sender_fullhost(); set_process_info("handling incoming connection from %s via inetd", sender_fullhost); } /* If the sender host address has been set, build sender_fullhost if it hasn't already been done (which it will have been for inetd). This caters for the case when it is forced by -oMa. However, we must flag that is isn't a socket, so that the test for IP options is skipped for -bs input. */ if (sender_host_address != NULL && sender_fullhost == NULL) { host_build_sender_fullhost(); set_process_info("handling incoming connection from %s via -oMa", sender_fullhost); sender_host_notsocket = TRUE; } /* Otherwise, set the sender host as unknown except for inetd calls. This prevents host checking in the case of -bs not from inetd and also for -bS. */ else if (!is_inetd) sender_host_unknown = TRUE; /* If stdout does not exist, then dup stdin to stdout. This can happen if exim is started from inetd. In this case fd 0 will be set to the socket, but fd 1 will not be set. */ if (fstat(1, &statbuf) < 0) dup2(0, 1); /* Set up the incoming protocol name and the state of the program. Root is allowed to force received protocol via the -oMr option above, and if we are in a non-local SMTP state it means we have come via inetd and the process info has already been set up. We don't set received_protocol here for smtp input, as it varies according to batch/HELO/EHLO. */ if (smtp_input) { if (sender_local) set_process_info("accepting a local SMTP message from <%s>", sender_address); } else { if (received_protocol == NULL) received_protocol = string_sprintf("local%s", called_as); set_process_info("accepting a local non-SMTP message from <%s>", sender_address); } /* Initialize the queue-only flag that can change as a result of a check on the system load. */ queue_check_only(); local_queue_only = queue_only; /* For non-SMTP and for batched SMTP input, check that there is enough space on the spool if so configured. On failure, we must not attempt to send an error message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP error code is given.) */ if ((!smtp_input || smtp_batched_input) && !accept_check_fs(0)) { fprintf(stderr, "exim: insufficient disc space\n"); return EXIT_FAILURE; } /* If this is batched SMTP input and sender_verify_batch is off, turn off the sender verification options. */ if (smtp_batched_input && !sender_verify_batch) sender_verify = sender_try_verify = FALSE; /* If this is smtp input of any kind, handle the start of the SMTP session. */ if (smtp_input) { smtp_in = stdin; smtp_out = stdout; if (!smtp_start_session()) exit(EXIT_SUCCESS); } /* Loop for several messages when reading SMTP input. Reset the pool store each time. If we fork any child processes, we don't want to wait for them unless synchronous delivery is requested, so set SIGCHLD to SIG_IGN in that case. This is not the same as SIG_DFL, despite the fact that documentation often lists the default as "ignore". At least on some systems, setting SIG_IGN causes child processes that complete simply to go away without ever becoming defunct. You can't therefore wait for them - but we don't want to wait for them in the non-synchronous delivery case. */ if (!synchronous_delivery) signal(SIGCHLD, SIG_IGN); /* Save the current store pool point, for resetting at the start of each message, and save the real sender address, if any. */ reset_point = store_get(0); real_sender_address = sender_address; while (more) { store_reset(reset_point); /* In the SMTP case, we have to handle the initial SMTP input and build the recipients list, before calling accept_msg to read the message proper. Whatever sender address is actually given in the SMTP transaction is actually ignored for local senders - we use the actual sender, which is either the underlying user running this process or a -f argument provided by a root caller. This is indicated by the existence of sender_address, which will be NULL only for a trusted caller when no -f was given. It is saved in real_sender_address, which is global so that the error message generator can find it if necessary. */ if (smtp_input) { int rc; if ((rc = smtp_setup_msg()) > 0) { if (real_sender_address != NULL) sender_address = raw_sender = real_sender_address; more = accept_msg(stdin, stdout, extract_recipients); if (message_id[0] == 0) { if (more) continue; exit(EXIT_FAILURE); } } else exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE); } /* In the non-SMTP case, we have all the information from the command line, but must process it in case it is in the more general RFC822 format, and in any case, to detect syntax errors. Also, it appears that the use of comma-separated lists as single arguments is common, so we had better support them. */ else { int i; int rcount = 0; int count = argc - recipients_arg; char **list = argv + recipients_arg; /* Save before any rewriting */ raw_sender = string_copy(sender_address); /* Loop for each argument */ for (i = 0; i < count; i++) { int start, end, domain; char *errmess; char *s = list[i]; /* Loop for each comma-separated address */ while (*s != 0) { BOOL finished = FALSE; char *receiver; char *ss = parse_find_address_end(s, FALSE); if (*ss == ',') *ss = 0; else finished = TRUE; /* Check max recipients - if -t was used, these aren't recipients */ if (recipients_max > 0 && ++rcount > recipients_max && !extract_recipients) { if (error_handling == ERRORS_STDERR) { fprintf(stderr, "exim: too many recipients\n"); exit(EXIT_FAILURE); } else { return moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)? errors_sender_rc : EXIT_FAILURE; } } receiver = parse_extract_address(s, &errmess, &start, &end, &domain, FALSE); if (receiver == NULL) { if (error_handling == ERRORS_STDERR) { fprintf(stderr, "exim: bad address \"%s\": %s\n", string_printing(list[i]), errmess); return EXIT_FAILURE; } else { error_block eblock; eblock.next = NULL; eblock.text1 = string_printing(list[i]); eblock.text2 = errmess; return moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)? errors_sender_rc : EXIT_FAILURE; } } accept_add_recipient(receiver, NULL, 0, 0); s = ss; if (!finished) while (*(++s) != 0 && (*s == ',' || isspace(*s))); } } /* Show the recipients when debugging */ DEBUG(9) { int i; if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address); if (recipients_list != NULL) { debug_printf("Recipients:\n"); for (i = 0; i < recipients_count; i++) debug_printf(" %s\n", recipients_list[i].address); } } /* Read the data for the message. If filter_test is true, this will just read the headers for the message, and not write anything onto the spool. */ more = accept_msg(stdin, stdout, extract_recipients); /* more is always FALSE here (not SMTP message) when reading a message for real; when reading the headers of a message for filter testing, it is TRUE if the headers were terminated by '.' and FALSE otherwise. */ if (message_id[0] == 0) return EXIT_FAILURE; } /* If this is a filter testing run, there are headers in store, but no message on the spool. Run the filtering code in testing mode, setting the domain to the qualify domain and the local part to the current user, unless they have been set by options. The prefix and suffix are left unset unless specified. The the return path is set to to the sender unless it has already been set from a return-path header in the message. */ if (filter_test != NULL) { deliver_domain = (ftest_domain != NULL)? ftest_domain : qualify_domain_recipient; deliver_domain_orig = deliver_domain; deliver_localpart = (ftest_localpart != NULL)? ftest_localpart : user_login; deliver_localpart_orig = deliver_localpart; deliver_localpart_prefix = ftest_prefix; deliver_localpart_suffix = ftest_suffix; deliver_home = getenv("HOME"); if (return_path == NULL) return_path = string_copy(sender_address); exit(filter_runtest(filter_fd, ftest_system, more)? EXIT_SUCCESS : EXIT_FAILURE); } /* Else act on the result of message reception. We should not get here unless message_id[0] is non-zero. If queue_only is set, local_queue_only will be TRUE. If it is not, check on the number of messages received in this connection. If that's OK and queue_only_load is set, check that the load average is below it. If it is not, set local_queue_only TRUE. Note that it then remains this way for any subsequent messages on the same SMTP connection. This is a deliberate choice; even though the load average may fall, it doesn't seem right to deliver later messages on the same call when not delivering earlier ones. */ if (!local_queue_only) { if (smtp_accept_queue_per_connection > 0 && ++message_count > smtp_accept_queue_per_connection) { local_queue_only = TRUE; queue_only_reason = 2; } else if (queue_only_load >= 0) { local_queue_only = (load_average = os_getloadavg()) > queue_only_load; if (local_queue_only) queue_only_reason = 3; } } /* Log the queueing here, when it will get a message id attached, but not if queue_only is set (case 0). Case 1 doesn't happen here (too many connections). */ if (local_queue_only) switch(queue_only_reason) { case 2: log_write(4, LOG_MAIN, "no immediate delivery: more than %d messages " "received in one connection", smtp_accept_queue_per_connection); break; case 3: log_write(4, LOG_MAIN, "no immediate delivery: load average was %.2f\n", (double)load_average/1000.0); break; } /* Else do the delivery */ else { /* If running as root, or if we can regain root by seteuid, or this binary is not setuid to root (an exceptional case) call the delivery function directly for synchronous delivery, or fork a clone of this process to deliver in the background. A fork failure is not a disaster, as the delivery will eventually happen on a subsequent queue run. We want any smtp input streams to be closed. However, it has been observed that using fclose() here causes trouble. When reading in -bS input, duplicate copies of messages have been seen. The files will be sharing a file pointer with the parent process, and it seems that fclose() (at least on some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at least sometimes. Hence we go for closing the underlying file descriptors. */ if (security_level <= 1 || original_euid != root_uid) { if (synchronous_delivery) (void)deliver_message(message_id, FALSE, FALSE, FALSE); else if(fork() == 0) { if (smtp_input) { close(fileno(smtp_in)); /* See comment above */ close(fileno(smtp_out)); smtp_in = NULL; } (void)deliver_message(message_id, FALSE, FALSE, FALSE); _exit(EXIT_SUCCESS); } } /* Otherwise, we have to re-exec exim in order to regain root for the delivery of the message. */ else { pid_t pid; if ((pid = fork()) == 0) { int i = 0; char *argv[12 + MAX_CLMACROS]; if (smtp_input) { close(fileno(smtp_in)); /* See comment above */ close(fileno(smtp_out)); } argv[i++] = exim_path; if (clmacro_count > 0) { memcpy(argv + i, clmacros, clmacro_count * sizeof(char *)); i += clmacro_count; } if (debug_level > 0) argv[i++] = string_sprintf("-d%d", debug_level); if (debug_trace_memory) argv[i++] = "-dm"; if (dont_deliver) argv[i++] = "-N"; if (queue_smtp) argv[i++] = "-odqs"; if (queue_remote) argv[i++] = "-odqr"; if (batch_max >= 0) argv[i++] = string_sprintf("-oB%d", batch_max); if (config_changed) { argv[i++] = "-C"; argv[i++] = config_filename; } argv[i++] = "-Mc"; argv[i++] = message_id; argv[i++] = NULL; DEBUG(4) { while (i < 10) argv[i++] = NULL; debug_printf("exec %s %s %s %s %s %s %s %s %s %s\n", argv[0], argv[1], argv[2], (argv[3] == NULL)? "" : argv[3], (argv[4] == NULL)? "" : argv[4], (argv[5] == NULL)? "" : argv[5], (argv[6] == NULL)? "" : argv[6], (argv[7] == NULL)? "" : argv[7], (argv[8] == NULL)? "" : argv[8], (argv[9] == NULL)? "" : argv[9]); } execv(argv[0], argv); _exit(errno); } /* In the parent, wait if synchronous delivery is required. */ if (synchronous_delivery && pid > 0) { int status; while (wait(&status) != pid); } } } /* The loop will repeat if more is TRUE. */ } return EXIT_SUCCESS; } /* End of exim.c */