1 /* $NetBSD: mailwrapper.c,v 1.5 2001/02/19 23:22:44 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1998 5 * Perry E. Metzger. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgment: 17 * This product includes software developed for the NetBSD Project 18 * by Perry E. Metzger. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <err.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <stdlib.h> 38 #include <unistd.h> 39 #include <util.h> 40 41 #define _PATH_MAILERCONF "/etc/mailer.conf" 42 43 struct arglist { 44 size_t argc, maxc; 45 char **argv; 46 }; 47 48 int main __P((int, char *[], char *[])); 49 50 static void initarg __P((struct arglist *)); 51 static void addarg __P((struct arglist *, const char *, int)); 52 53 static void 54 initarg(al) 55 struct arglist *al; 56 { 57 al->argc = 0; 58 al->maxc = 10; 59 if ((al->argv = malloc(al->maxc * sizeof(char *))) == NULL) 60 err(1, "mailwrapper"); 61 } 62 63 static void 64 addarg(al, arg, copy) 65 struct arglist *al; 66 const char *arg; 67 int copy; 68 { 69 if (al->argc == al->maxc) { 70 al->maxc <<= 1; 71 if ((al->argv = realloc(al->argv, 72 al->maxc * sizeof(char *))) == NULL) 73 err(1, "mailwrapper"); 74 } 75 if (copy) { 76 if ((al->argv[al->argc++] = strdup(arg)) == NULL) 77 err(1, "mailwrapper:"); 78 } else 79 al->argv[al->argc++] = (char *)arg; 80 } 81 82 int 83 main(argc, argv, envp) 84 int argc; 85 char *argv[]; 86 char *envp[]; 87 { 88 FILE *config; 89 char *line, *cp, *from, *to, *ap; 90 size_t len, lineno = 0; 91 struct arglist al; 92 93 initarg(&al); 94 for (len = 0; len < argc; len++) 95 addarg(&al, argv[len], 0); 96 97 if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) 98 err(1, "mailwrapper: can't open %s", _PATH_MAILERCONF); 99 100 for (;;) { 101 if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) { 102 if (feof(config)) 103 errx(1, "mailwrapper: no mapping in %s", 104 _PATH_MAILERCONF); 105 err(1, "mailwrapper"); 106 } 107 108 #define WS " \t\n" 109 cp = line; 110 111 cp += strspn(cp, WS); 112 if (cp[0] == '\0') { 113 /* empty line */ 114 free(line); 115 continue; 116 } 117 118 if ((from = strsep(&cp, WS)) == NULL) 119 goto parse_error; 120 121 cp += strspn(cp, WS); 122 123 if ((to = strsep(&cp, WS)) == NULL) 124 goto parse_error; 125 126 if (strcmp(from, getprogname()) == 0) { 127 for (ap = strsep(&cp, WS); ap != NULL; 128 ap = strsep(&cp, WS)) 129 if (*ap) 130 addarg(&al, ap, 0); 131 break; 132 } 133 134 free(line); 135 } 136 137 (void)fclose(config); 138 139 addarg(&al, NULL, 0); 140 execve(to, al.argv, envp); 141 err(1, "mailwrapper: execing %s", to); 142 /*NOTREACHED*/ 143 parse_error: 144 errx(1, "mailwrapper: parse error in %s at line %lu", 145 _PATH_MAILERCONF, (u_long)lineno); 146 /*NOTREACHED*/ 147 } 148