108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
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/*
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* MiniUPnP project
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* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
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* (c) 2009-2012 Jardel Weyrich
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* This software is subject to the conditions detailed
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* in the LICENCE file provided within the distribution
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*/
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#include "ipfwaux.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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int ipfw_exec(int optname, void * optval, uintptr_t optlen) {
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static int sock = -1;
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int result;
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switch (optname) {
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case IP_FW_INIT:
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if (sock == -1)
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sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
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if (sock < 0) {
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syslog(LOG_ERR, "socket(SOCK_RAW): %m");
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return -1;
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}
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break;
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case IP_FW_TERM:
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if (sock != -1)
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close(sock);
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sock = -1;
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break;
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case IP_FW_ADD:
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case IP_FW_DEL:
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result = setsockopt(sock, IPPROTO_IP, optname, optval, optlen);
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if (result == -1) {
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syslog(LOG_ERR, "setsockopt(): %m");
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return -1;
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}
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break;
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case IP_FW_GET:
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result = getsockopt(sock, IPPROTO_IP, optname, optval, (socklen_t *)optlen);
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if (result == -1) {
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syslog(LOG_ERR, "getsockopt(): %m");
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return -1;
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}
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break;
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default:
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syslog(LOG_ERR, "unhandled option");
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return -1;
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}
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return 0;
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}
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void ipfw_free_ruleset(struct ip_fw ** rules) {
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if (rules == NULL || *rules == NULL)
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return;
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free(*rules);
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*rules = NULL;
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}
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int ipfw_fetch_ruleset(struct ip_fw ** rules, int * total_fetched, int count) {
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int fetched;
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socklen_t size;
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if (rules == NULL || *total_fetched < 0 || count < 1)
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return -1;
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size = sizeof(struct ip_fw) * (*total_fetched + count);
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*rules = (struct ip_fw *)realloc(*rules, size);
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if (*rules == NULL) {
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syslog(LOG_ERR, "realloc(): %m");
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return -1;
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}
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(*rules)->version = IP_FW_CURRENT_API_VERSION;
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if (ipfw_exec(IP_FW_GET, *rules, (uintptr_t)&size) < 0)
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return -1;
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fetched = *total_fetched;
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*total_fetched = size / sizeof(struct ip_fw);
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return *total_fetched - fetched;
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}
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int ipfw_validate_protocol(int value) {
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switch (value) {
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case IPPROTO_TCP:
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case IPPROTO_UDP:
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break;
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default:
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syslog(LOG_ERR, "invalid protocol");
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return -1;
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}
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return 0;
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}
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int ipfw_validate_ifname(const char * const value) {
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int len = strlen(value);
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if (len < 2 || len > FW_IFNLEN) {
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syslog(LOG_ERR, "invalid interface name");
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return -1;
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}
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return 0;
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}
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