1 /* $OpenBSD: forward.c,v 1.35 2013/05/24 17:03:14 eric 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 34 #include "smtpd.h" 35 #include "log.h" 36 37 #define MAX_FORWARD_SIZE (4 * 1024) 38 #define MAX_EXPAND_NODES (100) 39 40 int 41 forwards_get(int fd, struct expand *expand) 42 { 43 FILE *fp = NULL; 44 char *line = NULL; 45 size_t len; 46 size_t lineno; 47 size_t save; 48 int ret; 49 struct stat sb; 50 51 ret = -1; 52 if (fstat(fd, &sb) == -1) 53 goto end; 54 55 /* if it's empty just pretend that no expansion took place */ 56 if (sb.st_size == 0) { 57 log_info("info: forward file is empty"); 58 ret = 0; 59 goto end; 60 } 61 62 /* over MAX_FORWARD_SIZE, temporarily fail */ 63 if (sb.st_size >= MAX_FORWARD_SIZE) { 64 log_info("info: forward file exceeds max size"); 65 goto end; 66 } 67 68 if ((fp = fdopen(fd, "r")) == NULL) { 69 log_warn("warn: fdopen failure in forwards_get()"); 70 goto end; 71 } 72 73 lineno = 0; 74 save = expand->nb_nodes; 75 while ((line = fparseln(fp, &len, &lineno, NULL, 0)) != NULL) { 76 if (! expand_line(expand, line, 0)) { 77 log_info("info: parse error in forward file"); 78 goto end; 79 } 80 if (expand->nb_nodes > MAX_EXPAND_NODES) { 81 log_info("info: forward file expanded too many nodes"); 82 goto end; 83 } 84 free(line); 85 } 86 87 ret = expand->nb_nodes > save ? 1 : 0; 88 89 end: 90 if (line) 91 free(line); 92 if (fp) 93 fclose(fp); 94 else 95 close(fd); 96 return ret; 97 } 98