diff options
Diffstat (limited to 'usr.sbin/mailwrapper/mailwrapper.c')
| -rw-r--r-- | usr.sbin/mailwrapper/mailwrapper.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/usr.sbin/mailwrapper/mailwrapper.c b/usr.sbin/mailwrapper/mailwrapper.c new file mode 100644 index 0000000..4d7d67d --- /dev/null +++ b/usr.sbin/mailwrapper/mailwrapper.c @@ -0,0 +1,165 @@ +/* $NetBSD: mailwrapper.c,v 1.3 1999/05/29 18:18:15 christos Exp $ */ + +/* + * 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 <err.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> +#include <util.h> + +#define _PATH_MAILERCONF "/etc/mailer.conf" + +struct arglist { + size_t argc, maxc; + char **argv; +}; + +int main __P((int, char *[], char *[])); + +static void initarg __P((struct arglist *)); +static void addarg __P((struct arglist *, const char *, int)); +static void freearg __P((struct arglist *, int)); + +extern const char *__progname; /* from crt0.o */ + +static void +initarg(al) + struct arglist *al; +{ + al->argc = 0; + al->maxc = 10; + if ((al->argv = malloc(al->maxc * sizeof(char *))) == NULL) + err(1, "mailwrapper"); +} + +static void +addarg(al, arg, copy) + struct arglist *al; + const char *arg; + int copy; +{ + if (al->argc == al->maxc) { + al->maxc <<= 1; + if ((al->argv = realloc(al->argv, + al->maxc * sizeof(char *))) == NULL) + err(1, "mailwrapper"); + } + if (copy) { + if ((al->argv[al->argc++] = strdup(arg)) == NULL) + err(1, "mailwrapper:"); + } else + al->argv[al->argc++] = (char *)arg; +} + +static void +freearg(al, copy) + struct arglist *al; + int copy; +{ + size_t i; + if (copy) + for (i = 0; i < al->argc; i++) + free(al->argv[i]); + free(al->argv); +} + +int +main(argc, argv, envp) + int argc; + char *argv[]; + char *envp[]; +{ + FILE *config; + char *line, *cp, *from, *to, *ap; + size_t len, lineno = 0; + struct arglist al; + + initarg(&al); + for (len = 0; len < argc; len++) + addarg(&al, argv[len], 0); + + if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) + err(1, "mailwrapper: can't open %s", _PATH_MAILERCONF); + + for (;;) { + if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) { + if (feof(config)) + errx(1, "mailwrapper: no mapping in %s", + _PATH_MAILERCONF); + err(1, "mailwrapper"); + } + +#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) + 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, 0); + break; + } + + free(line); + } + + (void)fclose(config); + + execve(to, al.argv, envp); + freearg(&al, 0); + free(line); + err(1, "mailwrapper: execing %s", to); + /*NOTREACHED*/ +parse_error: + freearg(&al, 0); + free(line); + errx(1, "mailwrapper: parse error in %s at line %lu", + _PATH_MAILERCONF, (u_long)lineno); + /*NOTREACHED*/ +} |
