1 /* $OpenBSD: forward.c,v 1.36 2015/01/20 17:37:54 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2008 Gilles Chehade <gilles@poolp.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/queue.h> 21 #include <sys/tree.h> 22 #include <sys/socket.h> 23 #include <sys/stat.h> 24 25 #include <ctype.h> 26 #include <event.h> 27 #include <imsg.h> 28 #include <stdio.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include <util.h> 32 #include <unistd.h> 33 #include <limits.h> 34 35 #include "smtpd.h" 36 #include "log.h" 37 38 #define MAX_FORWARD_SIZE (4 * 1024) 39 #define MAX_EXPAND_NODES (100) 40 41 int 42 forwards_get(int fd, struct expand *expand) 43 { 44 FILE *fp = NULL; 45 char *line = NULL; 46 size_t len; 47 size_t lineno; 48 size_t save; 49 int ret; 50 struct stat sb; 51 52 ret = -1; 53 if (fstat(fd, &sb) == -1) 54 goto end; 55 56 /* if it's empty just pretend that no expansion took place */ 57 if (sb.st_size == 0) { 58 log_info("info: forward file is empty"); 59 ret = 0; 60 goto end; 61 } 62 63 /* over MAX_FORWARD_SIZE, temporarily fail */ 64 if (sb.st_size >= MAX_FORWARD_SIZE) { 65 log_info("info: forward file exceeds max size"); 66 goto end; 67 } 68 69 if ((fp = fdopen(fd, "r")) == NULL) { 70 log_warn("warn: fdopen failure in forwards_get()"); 71 goto end; 72 } 73 74 lineno = 0; 75 save = expand->nb_nodes; 76 while ((line = fparseln(fp, &len, &lineno, NULL, 0)) != NULL) { 77 if (! expand_line(expand, line, 0)) { 78 log_info("info: parse error in forward file"); 79 goto end; 80 } 81 if (expand->nb_nodes > MAX_EXPAND_NODES) { 82 log_info("info: forward file expanded too many nodes"); 83 goto end; 84 } 85 free(line); 86 } 87 88 ret = expand->nb_nodes > save ? 1 : 0; 89 90 end: 91 if (line) 92 free(line); 93 if (fp) 94 fclose(fp); 95 else 96 close(fd); 97 return ret; 98 } 99