diff options
Diffstat (limited to 'usr.sbin/mailwrapper/mailwrapper.c')
| -rw-r--r-- | usr.sbin/mailwrapper/mailwrapper.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/usr.sbin/mailwrapper/mailwrapper.c b/usr.sbin/mailwrapper/mailwrapper.c new file mode 100644 index 000000000000..b060ff970045 --- /dev/null +++ b/usr.sbin/mailwrapper/mailwrapper.c @@ -0,0 +1,184 @@ +/* $OpenBSD: mailwrapper.c,v 1.18 2007/11/06 14:39:19 otto Exp $ */ +/* $NetBSD: mailwrapper.c,v 1.9 2003/03/09 08:10:43 mjl Exp $ */ + +/*- + * SPDX-License-Identifier: BSD-4-Clause + * + * Copyright (c) 1998 + * Perry E. Metzger. 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgment: + * This product includes software developed for the NetBSD Project + * by Perry E. Metzger. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. + */ + +#include <sys/param.h> + +#include <err.h> +#include <paths.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <stdlib.h> +#include <errno.h> +#include <libutil.h> +#include <sysexits.h> +#include <syslog.h> + +#include "pathnames.h" + +struct arglist { + size_t argc, maxc; + char **argv; +}; + +int main(int, char *[], char *[]); + +static void initarg(struct arglist *); +static void addarg(struct arglist *, const char *); + +static void +initarg(struct arglist *al) +{ + al->argc = 0; + al->maxc = 10; + if ((al->argv = calloc(al->maxc, sizeof(char *))) == NULL) + err(EX_TEMPFAIL, "calloc"); +} + +static void +addarg(struct arglist *al, const char *arg) +{ + + if (al->argc == al->maxc) { + al->maxc <<= 1; + al->argv = realloc(al->argv, al->maxc * sizeof(char *)); + if (al->argv == NULL) + err(EX_TEMPFAIL, "realloc"); + } + if (arg == NULL) + al->argv[al->argc++] = NULL; + else if ((al->argv[al->argc++] = strdup(arg)) == NULL) + err(EX_TEMPFAIL, "strdup"); +} + +int +main(int argc, char *argv[], char *envp[]) +{ + FILE *config; + char *line, *cp, *from, *to, *ap; + const char *progname; + char localmailerconf[MAXPATHLEN]; + const char *mailerconf; + size_t len, lineno = 0; + int i; + struct arglist al; + + /* change __progname to mailwrapper so we get sensible error messages */ + progname = getprogname(); + setprogname("mailwrapper"); + + initarg(&al); + addarg(&al, argv[0]); + + snprintf(localmailerconf, MAXPATHLEN, "%s/etc/mail/mailer.conf", + getlocalbase()); + + mailerconf = localmailerconf; + if ((config = fopen(localmailerconf, "r")) == NULL) + mailerconf = _PATH_MAILERCONF; + + if (config == NULL && ((config = fopen(mailerconf, "r")) == NULL)) { + int serrno = errno; + openlog(getprogname(), LOG_PID, LOG_MAIL); + + if (serrno == ENOENT) { + addarg(&al, NULL); + syslog(LOG_INFO, "%s does not exist, using %s as default MTA", + mailerconf, _PATH_DEFAULTMTA); + closelog(); + execve(_PATH_DEFAULTMTA, al.argv, envp); + err(EX_OSERR, "cannot exec %s", _PATH_DEFAULTMTA); + } else { + syslog(LOG_INFO, "cannot open %s: %s", + mailerconf, strerror(serrno)); + closelog(); + errno = serrno; + err(EX_OSERR, "cannot open %s", mailerconf); + } + /*NOTREACHED*/ + } + + for (;;) { + if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) { + if (feof(config)) + errx(EX_CONFIG, "no mapping in %s", mailerconf); + err(EX_CONFIG, "cannot parse line %lu", (u_long)lineno); + } + +#define WS " \t\n" + cp = line; + + cp += strspn(cp, WS); + if (cp[0] == '\0') { + /* empty line */ + free(line); + continue; + } + + if ((from = strsep(&cp, WS)) == NULL || cp == NULL) + goto parse_error; + + cp += strspn(cp, WS); + + if ((to = strsep(&cp, WS)) == NULL) + goto parse_error; + + if (strcmp(from, progname) == 0) { + for (ap = strsep(&cp, WS); ap != NULL; + ap = strsep(&cp, WS)) { + if (*ap) + addarg(&al, ap); + } + break; + } + + free(line); + } + + (void)fclose(config); + + for (i = 1; i < argc; i++) + addarg(&al, argv[i]); + + addarg(&al, NULL); + execve(to, al.argv, envp); + err(EX_OSERR, "cannot exec %s", to); + /*NOTREACHED*/ +parse_error: + errx(EX_CONFIG, "parse error in %s at line %lu", + mailerconf, (u_long)lineno); + /*NOTREACHED*/ +} |