/* * Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers. * All rights reserved. * Copyright (c) 1988, 1993 * The Regents of the University of California. All rights reserved. * * By using this file, you agree to the terms and conditions set * forth in the LICENSE file which can be found at the top level of * the sendmail distribution. * */ #include SM_IDSTR(copyright, "@(#) Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.\n\ All rights reserved.\n\ Copyright (c) 1988, 1993\n\ The Regents of the University of California. All rights reserved.\n") SM_IDSTR(id, "@(#)$Id: rmail.c,v 8.61 2001/09/18 21:45:29 gshapiro Exp $") /* * RMAIL -- UUCP mail server. * * This program reads the >From ... remote from ... lines that UUCP is so * fond of and turns them into something reasonable. It then execs sendmail * with various options built from these lines. * * The expected syntax is: * * := [-a-z0-9]+ * := ctime format * := [-a-z0-9!]+ * := "^\n$" * := "From" * [ "remote from" ] * := ">" * msg := * * * The output of rmail(8) compresses the lines into a single * from path. * * The err(3) routine is included here deliberately to make this code * a bit more portable. */ #include #include #include #include #include #include #include #include #include #include #ifdef EX_OK # undef EX_OK /* unistd.h may have another use for this */ #endif /* EX_OK */ #include #include #include #include static void err __P((int, const char *, ...)); static void usage __P((void)); static char *xalloc __P((int)); #define newstr(s) strcpy(xalloc(strlen(s) + 1), s) static char * xalloc(sz) register int sz; { register char *p; /* some systems can't handle size zero mallocs */ if (sz <= 0) sz = 1; p = malloc(sz); if (p == NULL) err(EX_TEMPFAIL, "out of memory"); return (p); } int main(argc, argv) int argc; char *argv[]; { int ch, debug, i, pdes[2], pid, status; size_t fplen = 0, fptlen = 0, len; off_t offset; SM_FILE_T *fp; char *addrp = NULL, *domain, *p, *t; char *from_path, *from_sys, *from_user; char **args, buf[2048], lbuf[2048]; struct stat sb; extern char *optarg; extern int optind; debug = 0; domain = "UUCP"; /* Default "domain". */ while ((ch = getopt(argc, argv, "D:T")) != -1) { switch (ch) { case 'T': debug = 1; break; case 'D': domain = optarg; break; case '?': default: usage(); } } argc -= optind; argv += optind; if (argc < 1) usage(); from_path = from_sys = from_user = NULL; for (offset = 0; ; ) { /* Get and nul-terminate the line. */ if (sm_io_fgets(smioin, SM_TIME_DEFAULT, lbuf, sizeof(lbuf)) == NULL) err(EX_DATAERR, "no data"); if ((p = strchr(lbuf, '\n')) == NULL) err(EX_DATAERR, "line too long"); *p = '\0'; /* Parse lines until reach a non-"From" line. */ if (!strncmp(lbuf, "From ", 5)) addrp = lbuf + 5; else if (!strncmp(lbuf, ">From ", 6)) addrp = lbuf + 6; else if (offset == 0) err(EX_DATAERR, "missing or empty From line: %s", lbuf); else { *p = '\n'; break; } if (addrp == NULL || *addrp == '\0') err(EX_DATAERR, "corrupted From line: %s", lbuf); /* Use the "remote from" if it exists. */ for (p = addrp; (p = strchr(p + 1, 'r')) != NULL; ) { if (!strncmp(p, "remote from ", 12)) { for (t = p += 12; *t != '\0'; ++t) { if (isascii(*t) && isspace(*t)) break; } *t = '\0'; if (debug) (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "remote from: %s\n", p); break; } } /* Else use the string up to the last bang. */ if (p == NULL) { if (*addrp == '!') err(EX_DATAERR, "bang starts address: %s", addrp); else if ((t = strrchr(addrp, '!')) != NULL) { *t = '\0'; p = addrp; addrp = t + 1; if (*addrp == '\0') err(EX_DATAERR, "corrupted From line: %s", lbuf); if (debug) (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "bang: %s\n", p); } } /* 'p' now points to any system string from this line. */ if (p != NULL) { /* Nul terminate it as necessary. */ for (t = p; *t != '\0'; ++t) { if (isascii(*t) && isspace(*t)) break; } *t = '\0'; /* If the first system, copy to the from_sys string. */ if (from_sys == NULL) { from_sys = newstr(p); if (debug) (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "from_sys: %s\n", from_sys); } /* Concatenate to the path string. */ len = t - p; if (from_path == NULL) { fplen = 0; if ((from_path = malloc(fptlen = 256)) == NULL) err(EX_TEMPFAIL, "out of memory"); } if (fplen + len + 2 > fptlen) { fptlen += SM_MAX(fplen + len + 2, 256); if ((from_path = realloc(from_path, fptlen)) == NULL) err(EX_TEMPFAIL, "out of memory"); } memmove(from_path + fplen, p, len); fplen += len; from_path[fplen++] = '!'; from_path[fplen] = '\0'; } /* Save off from user's address; the last one wins. */ for (p = addrp; *p != '\0'; ++p) { if (isascii(*p) && isspace(*p)) break; } *p = '\0'; if (*addrp == '\0') addrp = "<>"; if (from_user != NULL) free(from_user); from_user = newstr(addrp); if (debug) { if (from_path != NULL) (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "from_path: %s\n", from_path); (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "from_user: %s\n", from_user); } if (offset != -1) offset = (off_t)sm_io_tell(smioin, SM_TIME_DEFAULT); } /* Allocate args (with room for sendmail args as well as recipients */ args = (char **)xalloc(sizeof(*args) * (10 + argc)); i = 0; args[i++] = _PATH_SENDMAIL; /* Build sendmail's argument list. */ args[i++] = "-G"; /* relay submission */ args[i++] = "-oee"; /* No errors, just status. */ args[i++] = "-odq"; /* Queue it, don't try to deliver. */ args[i++] = "-oi"; /* Ignore '.' on a line by itself. */ /* set from system and protocol used */ if (from_sys == NULL) sm_snprintf(buf, sizeof(buf), "-p%s", domain); else if (strchr(from_sys, '.') == NULL) sm_snprintf(buf, sizeof(buf), "-p%s:%s.%s", domain, from_sys, domain); else sm_snprintf(buf, sizeof(buf), "-p%s:%s", domain, from_sys); args[i++] = newstr(buf); /* Set name of ``from'' person. */ sm_snprintf(buf, sizeof(buf), "-f%s%s", from_path ? from_path : "", from_user); args[i++] = newstr(buf); /* ** Don't copy arguments beginning with - as they will be ** passed to sendmail and could be interpreted as flags. ** To prevent confusion of sendmail wrap < and > around ** the address (helps to pass addrs like @gw1,@gw2:aa@bb) */ while (*argv != NULL) { if (**argv == '-') err(EX_USAGE, "dash precedes argument: %s", *argv); if (strchr(*argv, ',') == NULL || strchr(*argv, '<') != NULL) args[i++] = *argv; else { len = strlen(*argv) + 3; if ((args[i] = malloc(len)) == NULL) err(EX_TEMPFAIL, "Cannot malloc"); sm_snprintf(args[i++], len, "<%s>", *argv); } argv++; argc--; /* Paranoia check, argc used for args[] bound */ if (argc < 0) err(EX_SOFTWARE, "Argument count mismatch"); } args[i] = NULL; if (debug) { (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "Sendmail arguments:\n"); for (i = 0; args[i] != NULL; i++) (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "\t%s\n", args[i]); } /* ** If called with a regular file as standard input, seek to the right ** position in the file and just exec sendmail. Could probably skip ** skip the stat, but it's not unreasonable to believe that a failed ** seek will cause future reads to fail. */ if (!fstat(STDIN_FILENO, &sb) && S_ISREG(sb.st_mode)) { if (lseek(STDIN_FILENO, offset, SEEK_SET) != offset) err(EX_TEMPFAIL, "stdin seek"); (void) execv(_PATH_SENDMAIL, args); err(EX_OSERR, "%s", _PATH_SENDMAIL); } if (pipe(pdes) < 0) err(EX_OSERR, "pipe failed"); switch (pid = fork()) { case -1: /* Err. */ err(EX_OSERR, "fork failed"); /* NOTREACHED */ case 0: /* Child. */ if (pdes[0] != STDIN_FILENO) { (void) dup2(pdes[0], STDIN_FILENO); (void) close(pdes[0]); } (void) close(pdes[1]); (void) execv(_PATH_SENDMAIL, args); err(EX_UNAVAILABLE, "%s", _PATH_SENDMAIL); /* NOTREACHED */ } if ((fp = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT, (void *) &(pdes[1]), SM_IO_WRONLY, NULL)) == NULL) err(EX_OSERR, "sm_io_open failed"); (void) close(pdes[0]); /* Copy the file down the pipe. */ do { (void) sm_io_fprintf(fp, SM_TIME_DEFAULT, "%s", lbuf); } while (sm_io_fgets(smioin, SM_TIME_DEFAULT, lbuf, sizeof(lbuf)) != NULL); if (sm_io_error(smioin)) err(EX_TEMPFAIL, "stdin: %s", sm_errstring(errno)); if (sm_io_close(fp, SM_TIME_DEFAULT)) err(EX_OSERR, "sm_io_close failed"); if ((waitpid(pid, &status, 0)) == -1) err(EX_OSERR, "%s", _PATH_SENDMAIL); if (!WIFEXITED(status)) err(EX_OSERR, "%s: did not terminate normally", _PATH_SENDMAIL); if (WEXITSTATUS(status)) err(status, "%s: terminated with %d (non-zero) status", _PATH_SENDMAIL, WEXITSTATUS(status)); exit(EX_OK); /* NOTREACHED */ return EX_OK; } static void usage() { (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "usage: rmail [-T] [-D domain] user ...\n"); exit(EX_USAGE); } static void #ifdef __STDC__ err(int eval, const char *fmt, ...) #else /* __STDC__ */ err(eval, fmt, va_alist) int eval; const char *fmt; va_dcl #endif /* __STDC__ */ { SM_VA_LOCAL_DECL if (fmt != NULL) { SM_VA_START(ap, fmt); (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "rmail: "); (void) sm_io_vfprintf(smioerr, SM_TIME_DEFAULT, fmt, ap); SM_VA_END(ap); (void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "\n"); } exit(eval); }