440 lines
10 KiB
C
440 lines
10 KiB
C
/*
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* Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.
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* 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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* $FreeBSD$
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*
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*/
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#include <sm/gen.h>
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SM_IDSTR(copyright,
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"@(#) Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.\n\
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All rights reserved.\n\
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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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SM_IDSTR(id, "@(#)$Id: rmail.c,v 8.62 2013/03/12 15:24:52 ca Exp $")
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/*
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* RMAIL -- UUCP mail server.
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*
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* This program reads the >From ... remote from ... lines that UUCP is so
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* fond of and turns them into something reasonable. It then execs sendmail
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* with various options built from these lines.
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*
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* The expected syntax is:
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*
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* <user> := [-a-z0-9]+
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* <date> := ctime format
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* <site> := [-a-z0-9!]+
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* <blank line> := "^\n$"
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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/types.h>
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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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#include <sm/io.h>
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#include <stdlib.h>
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#include <sm/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 /* EX_OK */
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#include <sysexits.h>
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#include <sm/conf.h>
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#include <sm/errstring.h>
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#include <sendmail/pathnames.h>
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static void err __P((int, const char *, ...));
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static void usage __P((void));
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static char *xalloc __P((int));
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#define newstr(s) strcpy(xalloc(strlen(s) + 1), s)
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static 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(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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int ch, debug, i, pdes[2], pid, status;
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size_t fplen = 0, fptlen = 0, len;
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off_t offset;
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SM_FILE_T *fp;
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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, buf[2048], lbuf[2048];
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struct stat sb;
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extern char *optarg;
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extern int optind;
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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")) != -1)
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{
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switch (ch)
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{
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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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}
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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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{
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/* Get and nul-terminate the line. */
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if (sm_io_fgets(smioin, SM_TIME_DEFAULT, lbuf,
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sizeof(lbuf)) < 0)
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err(EX_DATAERR, "no data");
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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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{
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*p = '\n';
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break;
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}
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if (addrp == NULL || *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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{
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if (!strncmp(p, "remote from ", 12))
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{
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for (t = p += 12; *t != '\0'; ++t)
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{
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if (isascii(*t) && isspace(*t))
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break;
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}
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*t = '\0';
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if (debug)
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(void) sm_io_fprintf(smioerr,
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SM_TIME_DEFAULT,
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"remote from: %s\n",
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p);
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break;
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}
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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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{
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if (*addrp == '!')
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err(EX_DATAERR, "bang starts address: %s",
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addrp);
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else if ((t = strrchr(addrp, '!')) != NULL)
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{
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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) sm_io_fprintf(smioerr,
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SM_TIME_DEFAULT,
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"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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{
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/* Nul terminate it as necessary. */
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for (t = p; *t != '\0'; ++t)
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{
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if (isascii(*t) && isspace(*t))
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break;
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}
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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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{
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from_sys = newstr(p);
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if (debug)
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(void) sm_io_fprintf(smioerr,
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SM_TIME_DEFAULT,
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"from_sys: %s\n",
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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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{
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fplen = 0;
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if ((from_path = malloc(fptlen = 256)) == NULL)
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err(EX_TEMPFAIL, "out of memory");
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}
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if (fplen + len + 2 > fptlen)
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{
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fptlen += SM_MAX(fplen + len + 2, 256);
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if ((from_path = realloc(from_path,
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fptlen)) == NULL)
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err(EX_TEMPFAIL, "out of memory");
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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 != '\0'; ++p)
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{
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if (isascii(*p) && isspace(*p))
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break;
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}
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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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{
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if (from_path != NULL)
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(void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT,
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"from_path: %s\n",
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from_path);
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(void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT,
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"from_user: %s\n", from_user);
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}
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if (offset != -1)
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offset = (off_t)sm_io_tell(smioin, SM_TIME_DEFAULT);
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}
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/* Allocate args (with room for sendmail args as well as recipients */
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args = (char **)xalloc(sizeof(*args) * (10 + argc));
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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++] = "-G"; /* relay submission */
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args[i++] = "-oee"; /* No errors, just status. */
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#ifdef QUEUE_ONLY
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args[i++] = "-odq"; /* Queue it, don't try to deliver. */
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#else
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args[i++] = "-odi"; /* Deliver in foreground. */
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#endif
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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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sm_snprintf(buf, sizeof(buf), "-p%s", domain);
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else if (strchr(from_sys, '.') == NULL)
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sm_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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sm_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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sm_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 != NULL)
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{
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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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{
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len = strlen(*argv) + 3;
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if ((args[i] = malloc(len)) == NULL)
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err(EX_TEMPFAIL, "Cannot malloc");
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sm_snprintf(args[i++], len, "<%s>", *argv);
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}
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argv++;
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argc--;
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/* Paranoia check, argc used for args[] bound */
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if (argc < 0)
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err(EX_SOFTWARE, "Argument count mismatch");
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}
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args[i] = NULL;
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if (debug)
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{
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(void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT,
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"Sendmail arguments:\n");
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for (i = 0; args[i] != NULL; i++)
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(void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT,
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"\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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{
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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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(void) 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, "pipe failed");
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switch (pid = fork())
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{
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case -1: /* Err. */
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err(EX_OSERR, "fork failed");
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/* NOTREACHED */
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case 0: /* Child. */
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if (pdes[0] != STDIN_FILENO)
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{
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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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(void) execv(_PATH_SENDMAIL, args);
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err(EX_UNAVAILABLE, "%s", _PATH_SENDMAIL);
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/* NOTREACHED */
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}
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if ((fp = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT, (void *) &(pdes[1]),
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SM_IO_WRONLY, NULL)) == NULL)
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err(EX_OSERR, "sm_io_open failed");
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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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{
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(void) sm_io_fprintf(fp, SM_TIME_DEFAULT, "%s", lbuf);
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} while (sm_io_fgets(smioin, SM_TIME_DEFAULT, lbuf,
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sizeof(lbuf)) >= 0);
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if (sm_io_error(smioin))
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err(EX_TEMPFAIL, "stdin: %s", sm_errstring(errno));
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if (sm_io_close(fp, SM_TIME_DEFAULT))
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err(EX_OSERR, "sm_io_close failed");
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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, "%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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/* NOTREACHED */
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return EX_OK;
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}
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static void
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usage()
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{
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(void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT,
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"usage: rmail [-T] [-D domain] user ...\n");
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exit(EX_USAGE);
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}
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static void
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#ifdef __STDC__
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err(int eval, const char *fmt, ...)
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#else /* __STDC__ */
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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 /* __STDC__ */
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{
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SM_VA_LOCAL_DECL
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if (fmt != NULL)
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{
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SM_VA_START(ap, fmt);
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(void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "rmail: ");
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(void) sm_io_vfprintf(smioerr, SM_TIME_DEFAULT, fmt, ap);
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SM_VA_END(ap);
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(void) sm_io_fprintf(smioerr, SM_TIME_DEFAULT, "\n");
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}
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exit(eval);
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}
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