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/* $OpenBSD: forward.c,v 1.40 2021/06/14 17:58:15 eric 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 <sys/stat.h>
#include <stdlib.h>
#include <util.h>
#include <unistd.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;
}
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