diff options
Diffstat (limited to 'smtpd/forward.c')
-rw-r--r-- | smtpd/forward.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/smtpd/forward.c b/smtpd/forward.c new file mode 100644 index 00000000..7494c6ce --- /dev/null +++ b/smtpd/forward.c @@ -0,0 +1,104 @@ +/* $OpenBSD: forward.c,v 1.39 2015/12/28 22:08:30 jung Exp $ */ + +/* + * Copyright (c) 2008 Gilles Chehade <gilles@poolp.org> + * + * 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 "includes.h" + +#include <sys/types.h> +#include <sys/queue.h> +#include <sys/tree.h> +#include <sys/socket.h> +#include <sys/stat.h> + +#include <ctype.h> +#include <event.h> +#include <imsg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#ifdef HAVE_UTIL_H +#include <util.h> +#endif +#ifdef HAVE_LIBUTIL_H +#include <libutil.h> +#endif +#include <unistd.h> +#include <limits.h> + +#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: + free(line); + if (fp) + fclose(fp); + else + close(fd); + return ret; +} |