/* $OpenBSD: forward.c,v 1.36 2015/01/20 17:37:54 deraadt Exp $ */ /* * Copyright (c) 2008 Gilles Chehade * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "smtpd.h" #include "log.h" #define MAX_FORWARD_SIZE (4 * 1024) #define MAX_EXPAND_NODES (100) int forwards_get(int fd, struct expand *expand) { FILE *fp = NULL; char *line = NULL; size_t len; size_t lineno; size_t save; int ret; struct stat sb; ret = -1; if (fstat(fd, &sb) == -1) goto end; /* if it's empty just pretend that no expansion took place */ if (sb.st_size == 0) { log_info("info: forward file is empty"); ret = 0; goto end; } /* over MAX_FORWARD_SIZE, temporarily fail */ if (sb.st_size >= MAX_FORWARD_SIZE) { log_info("info: forward file exceeds max size"); goto end; } if ((fp = fdopen(fd, "r")) == NULL) { log_warn("warn: fdopen failure in forwards_get()"); goto end; } lineno = 0; save = expand->nb_nodes; while ((line = fparseln(fp, &len, &lineno, NULL, 0)) != NULL) { if (! expand_line(expand, line, 0)) { log_info("info: parse error in forward file"); goto end; } if (expand->nb_nodes > MAX_EXPAND_NODES) { log_info("info: forward file expanded too many nodes"); goto end; } free(line); } ret = expand->nb_nodes > save ? 1 : 0; end: if (line) free(line); if (fp) fclose(fp); else close(fd); return ret; }