/* * Copyright (c) 1998 Sendmail, Inc. 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. * */ #ifndef lint static char copyright[] = "@(#) Copyright (c) 1988, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint static char sccsid[] = "@(#)rmail.c 8.18 (Berkeley) 10/23/1998"; #endif /* not lint */ /* * 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 #ifdef BSD4_4 # define FORK vfork # include #else # define FORK fork # ifndef _PATH_SENDMAIL # define _PATH_SENDMAIL "/usr/lib/sendmail" # endif #endif #include #include #include #include #ifdef EX_OK # undef EX_OK /* unistd.h may have another use for this */ #endif #include #ifndef MAX # define MAX(a, b) ((a) < (b) ? (b) : (a)) #endif #ifndef __P # ifdef __STDC__ # define __P(protos) protos # else # define __P(protos) () # define const # endif #endif #if defined(BSD4_4) || defined(linux) || SOLARIS >= 20600 || (SOLARIS < 10000 && SOLARIS >= 206) # define HASSNPRINTF 1 #endif #if defined(IRIX64) || defined(IRIX5) || defined(IRIX6) || \ defined(BSD4_4) || defined(__osf__) || defined(__GNU_LIBRARY__) # ifndef HASSTRERROR # define HASSTRERROR 1 /* has strerror(3) */ # endif #endif #if !HASSTRERROR extern char *strerror __P((int)); #endif #if defined(sun) && !defined(BSD) && !defined(SOLARIS) && !defined(__svr4__) && !defined(__SVR4) # define memmove(d, s, l) (bcopy((s), (d), (l))) #endif #if !HASSNPRINTF extern int snprintf __P((char *, size_t, const char *, ...)); #endif /* !HASSNPRINTF */ u_char tTdvect[100]; void err __P((int, const char *, ...)); void usage __P((void)); char *xalloc __P((int)); #define newstr(s) strcpy(xalloc(strlen(s) + 1), s) char * xalloc(sz) register int sz; { register char *p; /* some systems can't handle size zero mallocs */ if (sz <= 0) sz = 1; p = malloc((unsigned) sz); if (p == NULL) err(EX_TEMPFAIL, "out of memory"); return (p); } int main(argc, argv) int argc; char *argv[]; { extern char *optarg; extern int errno, optind; FILE *fp; struct stat sb; size_t fplen = 0, fptlen = 0, len; off_t offset; int ch, debug, i, pdes[2], pid, status; char *addrp = NULL, *domain, *p, *t; char *from_path, *from_sys, *from_user; char *args[100], buf[2048], lbuf[2048]; 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(); fplen = fptlen = 0; addrp = ""; from_path = from_sys = from_user = NULL; for (offset = 0;;) { /* Get and nul-terminate the line. */ if (fgets(lbuf, sizeof(lbuf), stdin) == NULL) exit (EX_DATAERR); 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 == '\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 && !(isascii(*t) && isspace(*t)); ++t); *t = '\0'; if (debug) (void)fprintf(stderr, "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)fprintf(stderr, "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 && !(isascii(*t) && isspace(*t)); ++t); *t = '\0'; /* If the first system, copy to the from_sys string. */ if (from_sys == NULL) { from_sys = newstr(p); if (debug) (void)fprintf(stderr, "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, NULL); } if (fplen + len + 2 > fptlen) { fptlen += MAX(fplen + len + 2, 256); if ((from_path = realloc(from_path, fptlen)) == NULL) err(EX_TEMPFAIL, NULL); } 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 && !(isascii(*p) && isspace(*p)); ++p); *p = '\0'; if (*addrp == '\0') addrp = "<>"; if (from_user != NULL) free(from_user); from_user = newstr(addrp); if (debug) { if (from_path != NULL) (void)fprintf(stderr, "from_path: %s\n", from_path); (void)fprintf(stderr, "from_user: %s\n", from_user); } if (offset != -1) offset = (off_t)ftell(stdin); } i = 0; args[i++] = _PATH_SENDMAIL; /* Build sendmail's argument list. */ args[i++] = "-oee"; /* No errors, just status. */ #ifdef QUEUE_ONLY args[i++] = "-odq"; /* Queue it, don't try to deliver. */ #else args[i++] = "-odi"; /* Deliver in foreground. */ #endif args[i++] = "-oi"; /* Ignore '.' on a line by itself. */ /* set from system and protocol used */ if (from_sys == NULL) (void)snprintf(buf, sizeof(buf), "-p%s", domain); else if (strchr(from_sys, '.') == NULL) (void)snprintf(buf, sizeof(buf), "-p%s:%s.%s", domain, from_sys, domain); else (void)snprintf(buf, sizeof(buf), "-p%s:%s", domain, from_sys); args[i++] = newstr(buf); /* Set name of ``from'' person. */ (void)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) { if (**argv == '-') err(EX_USAGE, "dash precedes argument: %s", *argv); if (strchr(*argv, ',') == NULL || strchr(*argv, '<') != NULL) args[i++] = *argv; else { if ((args[i] = malloc(strlen(*argv) + 3)) == NULL) err(EX_TEMPFAIL, "Cannot malloc"); sprintf (args [i++], "<%s>", *argv); } argv++; } args[i] = 0; if (debug) { (void)fprintf(stderr, "Sendmail arguments:\n"); for (i = 0; args[i]; i++) (void)fprintf(stderr, "\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"); execv(_PATH_SENDMAIL, args); err(EX_OSERR, "%s", _PATH_SENDMAIL); } if (pipe(pdes) < 0) err(EX_OSERR, NULL); switch (pid = FORK()) { case -1: /* Err. */ err(EX_OSERR, NULL); case 0: /* Child. */ if (pdes[0] != STDIN_FILENO) { (void)dup2(pdes[0], STDIN_FILENO); (void)close(pdes[0]); } (void)close(pdes[1]); execv(_PATH_SENDMAIL, args); _exit(127); /* NOTREACHED */ } if ((fp = fdopen(pdes[1], "w")) == NULL) err(EX_OSERR, NULL); (void)close(pdes[0]); /* Copy the file down the pipe. */ do { (void)fprintf(fp, "%s", lbuf); } while (fgets(lbuf, sizeof(lbuf), stdin) != NULL); if (ferror(stdin)) err(EX_TEMPFAIL, "stdin: %s", strerror(errno)); if (fclose(fp)) err(EX_OSERR, NULL); 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); } void usage() { (void)fprintf(stderr, "usage: rmail [-T] [-D domain] user ...\n"); exit(EX_USAGE); } #ifdef __STDC__ #include #else #include #endif void #ifdef __STDC__ err(int eval, const char *fmt, ...) #else err(eval, fmt, va_alist) int eval; const char *fmt; va_dcl #endif { va_list ap; #if __STDC__ va_start(ap, fmt); #else va_start(ap); #endif (void)fprintf(stderr, "rmail: "); (void)vfprintf(stderr, fmt, ap); va_end(ap); (void)fprintf(stderr, "\n"); exit(eval); } #if !HASSTRERROR char * strerror(eno) int eno; { extern int sys_nerr; extern char *sys_errlist[]; static char ebuf[60]; if (eno >= 0 && eno < sys_nerr) return sys_errlist[eno]; (void) sprintf(ebuf, "Error %d", eno); return ebuf; } #endif /* !HASSTRERROR */