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|
/* $OpenBSD: rmail.c,v 1.25 2012/12/04 02:24:47 deraadt Exp $ */
/* $NetBSD: rmail.c,v 1.8 1995/09/07 06:51:50 jtc Exp $ */
/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* 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:
*
* <user> := [-a-z0-9]+
* <date> := ctime format
* <site> := [-a-z0-9!]+
* <blank line> := "^\n$"
* <from> := "From" <space> <user> <space> <date>
* [<space> "remote from" <space> <site>]
* <forward> := ">" <from>
* msg := <from> <forward>* <blank-line> <body>
*
* The output of rmail(8) compresses the <forward> lines into a single
* from path.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <ctype.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <err.h>
#include <errno.h>
#ifndef MAX
# define MAX(a, b) ((a) < (b) ? (b) : (a))
#endif
extern char *__progname;
void usage(void);
#define TAYLOR_ENV /* use UU_MACHINE if present */
int
main(int argc, char *argv[])
{
FILE *fp;
struct stat sb;
size_t fplen, fptlen, len;
off_t offset;
int ch, debug, i, pdes[2], pid, status;
char *addrp, *domain, *p, *t;
char *from_path, *from_sys, *from_user;
char *args[100], buf[2048], lbuf[2048];
#ifdef lint
fplen = fptlen = 0;
addrp = NULL;
#endif
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;
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 (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 && !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 && !isspace(*t); ++t);
*t = '\0';
/* If the first system, copy to the from_sys string. */
if (from_sys == NULL) {
if ((from_sys = strdup(p)) == NULL)
err(EX_TEMPFAIL, NULL);
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) {
size_t newfptlen = fptlen +
MAX(fplen + len + 2, 256);
char *np;
if ((np = realloc(from_path, newfptlen)) == NULL)
err(EX_TEMPFAIL, NULL);
from_path = np;
fptlen = newfptlen;
}
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 && !isspace(*p); ++p);
*p = '\0';
if (*addrp == '\0')
addrp = "<>";
free(from_user);
if ((from_user = strdup(addrp)) == NULL)
err(EX_TEMPFAIL, NULL);
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 = ftello(stdin);
}
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++] = "-odi"; /* Deliver in foreground. */
args[i++] = "-oi"; /* Ignore '.' on a line by itself. */
/* set from system and protocol used */
#ifdef TAYLOR_ENV
{
char *uu_machine;
uu_machine = getenv("UU_MACHINE");
/* set by Taylor UUCP's uuxqt */
if (uu_machine)
from_sys = uu_machine;
}
#endif
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);
if ((args[i++] = strdup(buf)) == NULL)
err(EX_TEMPFAIL, NULL);
/* Set name of ``from'' person. */
(void)snprintf(buf, sizeof(buf), "-f%s%s",
from_path ? from_path : "", from_user);
if ((args[i++] = strdup(buf)) == NULL)
err(EX_TEMPFAIL, NULL);
/*
* 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 (asprintf(&args[i++], "<%s>", *argv) == -1)
err(EX_TEMPFAIL, "Cannot malloc");
}
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 = vfork()) {
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");
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)
{
(void)fprintf(stderr, "usage: %s [-T] [-D domain] user ...\n",
__progname);
exit(EX_USAGE);
}
|
