431 lines
9.9 KiB
C
431 lines
9.9 KiB
C
/*
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* Copyright (c) 1998 Sendmail, Inc. All rights reserved.
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1988, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)rmail.c 8.18 (Berkeley) 10/23/1998";
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#endif /* not lint */
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/*
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* RMAIL -- UUCP mail server.
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*
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* This program reads the >From ... remote from ... lines that UUCP is so
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* fond of and turns them into something reasonable. It then execs sendmail
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* with various options built from these lines.
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*
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* The expected syntax is:
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*
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* <user> := [-a-z0-9]+
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* <date> := ctime format
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* <site> := [-a-z0-9!]+
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* <blank line> := "^\n$"
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* <from> := "From" <space> <user> <space> <date>
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* [<space> "remote from" <space> <site>]
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* <forward> := ">" <from>
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* msg := <from> <forward>* <blank-line> <body>
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*
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* The output of rmail(8) compresses the <forward> lines into a single
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* from path.
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*
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* The err(3) routine is included here deliberately to make this code
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* a bit more portable.
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <ctype.h>
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#include <fcntl.h>
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#ifdef BSD4_4
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# define FORK vfork
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# include <paths.h>
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#else
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# define FORK fork
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# ifndef _PATH_SENDMAIL
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# define _PATH_SENDMAIL "/usr/lib/sendmail"
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# endif
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef EX_OK
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# undef EX_OK /* unistd.h may have another use for this */
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#endif
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#include <sysexits.h>
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#ifndef MAX
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# define MAX(a, b) ((a) < (b) ? (b) : (a))
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#endif
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#ifndef __P
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# ifdef __STDC__
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# define __P(protos) protos
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# else
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# define __P(protos) ()
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# define const
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# endif
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#endif
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#if defined(BSD4_4) || defined(linux) || SOLARIS >= 20600 || (SOLARIS < 10000 && SOLARIS >= 206)
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# define HASSNPRINTF 1
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#endif
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#if defined(IRIX64) || defined(IRIX5) || defined(IRIX6) || \
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defined(BSD4_4) || defined(__osf__) || defined(__GNU_LIBRARY__)
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# ifndef HASSTRERROR
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# define HASSTRERROR 1 /* has strerror(3) */
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# endif
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#endif
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#if !HASSTRERROR
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extern char *strerror __P((int));
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#endif
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#if defined(sun) && !defined(BSD) && !defined(SOLARIS) && !defined(__svr4__) && !defined(__SVR4)
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# define memmove(d, s, l) (bcopy((s), (d), (l)))
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#endif
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#if !HASSNPRINTF
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extern int snprintf __P((char *, size_t, const char *, ...));
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#endif /* !HASSNPRINTF */
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u_char tTdvect[100];
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void err __P((int, const char *, ...));
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void usage __P((void));
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char *xalloc __P((int));
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#define newstr(s) strcpy(xalloc(strlen(s) + 1), s)
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char *
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xalloc(sz)
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register int sz;
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{
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register char *p;
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/* some systems can't handle size zero mallocs */
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if (sz <= 0)
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sz = 1;
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p = malloc((unsigned) sz);
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if (p == NULL)
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err(EX_TEMPFAIL, "out of memory");
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return (p);
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}
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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extern char *optarg;
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extern int errno, optind;
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FILE *fp;
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struct stat sb;
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size_t fplen = 0, fptlen = 0, len;
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off_t offset;
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int ch, debug, i, pdes[2], pid, status;
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char *addrp = NULL, *domain, *p, *t;
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char *from_path, *from_sys, *from_user;
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char *args[100], buf[2048], lbuf[2048];
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debug = 0;
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domain = "UUCP"; /* Default "domain". */
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while ((ch = getopt(argc, argv, "D:T")) != EOF)
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switch (ch) {
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case 'T':
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debug = 1;
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break;
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case 'D':
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domain = optarg;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc < 1)
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usage();
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from_path = from_sys = from_user = NULL;
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for (offset = 0;;) {
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/* Get and nul-terminate the line. */
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if (fgets(lbuf, sizeof(lbuf), stdin) == NULL)
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exit (EX_DATAERR);
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if ((p = strchr(lbuf, '\n')) == NULL)
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err(EX_DATAERR, "line too long");
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*p = '\0';
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/* Parse lines until reach a non-"From" line. */
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if (!strncmp(lbuf, "From ", 5))
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addrp = lbuf + 5;
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else if (!strncmp(lbuf, ">From ", 6))
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addrp = lbuf + 6;
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else if (offset == 0)
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err(EX_DATAERR,
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"missing or empty From line: %s", lbuf);
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else {
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*p = '\n';
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break;
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}
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if (*addrp == '\0')
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err(EX_DATAERR, "corrupted From line: %s", lbuf);
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/* Use the "remote from" if it exists. */
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for (p = addrp; (p = strchr(p + 1, 'r')) != NULL;)
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if (!strncmp(p, "remote from ", 12)) {
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for (t = p += 12;
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*t && !(isascii(*t) && isspace(*t)); ++t);
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*t = '\0';
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if (debug)
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(void)fprintf(stderr,
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"remote from: %s\n", p);
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break;
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}
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/* Else use the string up to the last bang. */
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if (p == NULL) {
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if (*addrp == '!')
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err(EX_DATAERR,
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"bang starts address: %s", addrp);
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else if ((t = strrchr(addrp, '!')) != NULL) {
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*t = '\0';
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p = addrp;
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addrp = t + 1;
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if (*addrp == '\0')
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err(EX_DATAERR,
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"corrupted From line: %s", lbuf);
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if (debug)
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(void)fprintf(stderr, "bang: %s\n", p);
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}
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}
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/* 'p' now points to any system string from this line. */
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if (p != NULL) {
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/* Nul terminate it as necessary. */
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for (t = p; *t && !(isascii(*t) && isspace(*t)); ++t);
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*t = '\0';
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/* If the first system, copy to the from_sys string. */
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if (from_sys == NULL) {
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from_sys = newstr(p);
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if (debug)
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(void)fprintf(stderr,
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"from_sys: %s\n", from_sys);
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}
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/* Concatenate to the path string. */
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len = t - p;
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if (from_path == NULL) {
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fplen = 0;
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if ((from_path = malloc(fptlen = 256)) == NULL)
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err(EX_TEMPFAIL, NULL);
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}
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if (fplen + len + 2 > fptlen) {
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fptlen += MAX(fplen + len + 2, 256);
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if ((from_path =
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realloc(from_path, fptlen)) == NULL)
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err(EX_TEMPFAIL, NULL);
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}
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memmove(from_path + fplen, p, len);
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fplen += len;
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from_path[fplen++] = '!';
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from_path[fplen] = '\0';
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}
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/* Save off from user's address; the last one wins. */
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for (p = addrp; *p && !(isascii(*p) && isspace(*p)); ++p);
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*p = '\0';
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if (*addrp == '\0')
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addrp = "<>";
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if (from_user != NULL)
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free(from_user);
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from_user = newstr(addrp);
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if (debug) {
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if (from_path != NULL)
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(void)fprintf(stderr,
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"from_path: %s\n", from_path);
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(void)fprintf(stderr, "from_user: %s\n", from_user);
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}
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if (offset != -1)
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offset = (off_t)ftell(stdin);
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}
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i = 0;
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args[i++] = _PATH_SENDMAIL; /* Build sendmail's argument list. */
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args[i++] = "-oee"; /* No errors, just status. */
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args[i++] = "-odq"; /* Queue it, don't try to deliver. */
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args[i++] = "-oi"; /* Ignore '.' on a line by itself. */
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/* set from system and protocol used */
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if (from_sys == NULL)
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(void)snprintf(buf, sizeof(buf), "-p%s", domain);
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else if (strchr(from_sys, '.') == NULL)
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(void)snprintf(buf, sizeof(buf), "-p%s:%s.%s",
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domain, from_sys, domain);
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else
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(void)snprintf(buf, sizeof(buf), "-p%s:%s", domain, from_sys);
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args[i++] = newstr(buf);
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/* Set name of ``from'' person. */
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(void)snprintf(buf, sizeof(buf), "-f%s%s",
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from_path ? from_path : "", from_user);
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args[i++] = newstr(buf);
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/*
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* Don't copy arguments beginning with - as they will be
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* passed to sendmail and could be interpreted as flags.
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* To prevent confusion of sendmail wrap < and > around
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* the address (helps to pass addrs like @gw1,@gw2:aa@bb)
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*/
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while (*argv) {
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if (**argv == '-')
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err(EX_USAGE, "dash precedes argument: %s", *argv);
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if (strchr(*argv, ',') == NULL || strchr(*argv, '<') != NULL)
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args[i++] = *argv;
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else {
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if ((args[i] = malloc(strlen(*argv) + 3)) == NULL)
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err(EX_TEMPFAIL, "Cannot malloc");
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sprintf (args [i++], "<%s>", *argv);
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}
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argv++;
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}
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args[i] = 0;
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if (debug) {
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(void)fprintf(stderr, "Sendmail arguments:\n");
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for (i = 0; args[i]; i++)
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(void)fprintf(stderr, "\t%s\n", args[i]);
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}
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/*
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* If called with a regular file as standard input, seek to the right
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* position in the file and just exec sendmail. Could probably skip
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* skip the stat, but it's not unreasonable to believe that a failed
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* seek will cause future reads to fail.
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*/
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if (!fstat(STDIN_FILENO, &sb) && S_ISREG(sb.st_mode)) {
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if (lseek(STDIN_FILENO, offset, SEEK_SET) != offset)
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err(EX_TEMPFAIL, "stdin seek");
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execv(_PATH_SENDMAIL, args);
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err(EX_OSERR, "%s", _PATH_SENDMAIL);
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}
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if (pipe(pdes) < 0)
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err(EX_OSERR, NULL);
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switch (pid = FORK()) {
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case -1: /* Err. */
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err(EX_OSERR, NULL);
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case 0: /* Child. */
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if (pdes[0] != STDIN_FILENO) {
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(void)dup2(pdes[0], STDIN_FILENO);
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(void)close(pdes[0]);
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}
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(void)close(pdes[1]);
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execv(_PATH_SENDMAIL, args);
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_exit(127);
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/* NOTREACHED */
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}
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if ((fp = fdopen(pdes[1], "w")) == NULL)
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err(EX_OSERR, NULL);
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(void)close(pdes[0]);
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/* Copy the file down the pipe. */
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do {
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(void)fprintf(fp, "%s", lbuf);
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} while (fgets(lbuf, sizeof(lbuf), stdin) != NULL);
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if (ferror(stdin))
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err(EX_TEMPFAIL, "stdin: %s", strerror(errno));
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if (fclose(fp))
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err(EX_OSERR, NULL);
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if ((waitpid(pid, &status, 0)) == -1)
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err(EX_OSERR, "%s", _PATH_SENDMAIL);
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if (!WIFEXITED(status))
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err(EX_OSERR,
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"%s: did not terminate normally", _PATH_SENDMAIL);
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if (WEXITSTATUS(status))
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err(status, "%s: terminated with %d (non-zero) status",
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_PATH_SENDMAIL, WEXITSTATUS(status));
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exit(EX_OK);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: rmail [-T] [-D domain] user ...\n");
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exit(EX_USAGE);
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}
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#ifdef __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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void
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#ifdef __STDC__
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err(int eval, const char *fmt, ...)
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#else
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err(eval, fmt, va_alist)
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int eval;
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const char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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(void)fprintf(stderr, "rmail: ");
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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(void)fprintf(stderr, "\n");
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exit(eval);
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}
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#if !HASSTRERROR
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char *
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strerror(eno)
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int eno;
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{
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extern int sys_nerr;
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extern char *sys_errlist[];
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static char ebuf[60];
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if (eno >= 0 && eno < sys_nerr)
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return sys_errlist[eno];
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(void) sprintf(ebuf, "Error %d", eno);
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return ebuf;
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}
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#endif /* !HASSTRERROR */
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