275 lines
6.3 KiB
C
Executable File
275 lines
6.3 KiB
C
Executable File
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Various sorts of access control
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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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 <sys/time.h>
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#include <signal.h>
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#include <errno.h>
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#include <unistd.h>
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#include <asterisk/acl.h>
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#include <asterisk/logger.h>
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#include <asterisk/channel.h>
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#include <asterisk/utils.h>
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#include <asterisk/lock.h>
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#include <asterisk/srv.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <net/if.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <sys/ioctl.h>
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#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__)
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#include <fcntl.h>
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#include <net/route.h>
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AST_MUTEX_DEFINE_STATIC(routeseq_lock);
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#endif
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#if defined (SOLARIS)
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#include <sys/sockio.h>
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#endif
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struct ast_ha {
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/* Host access rule */
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struct in_addr netaddr;
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struct in_addr netmask;
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int sense;
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struct ast_ha *next;
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};
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/* Default IP - if not otherwise set, don't breathe garbage */
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static struct in_addr __ourip = { 0x00000000 };
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struct my_ifreq {
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char ifrn_name[IFNAMSIZ]; /* Interface name, e.g. "eth0", "ppp0", etc. */
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struct sockaddr_in ifru_addr;
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};
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/* Free HA structure */
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void ast_free_ha(struct ast_ha *ha)
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{
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struct ast_ha *hal;
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while(ha) {
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hal = ha;
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ha = ha->next;
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free(hal);
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}
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}
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/* Copy HA structure */
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static void ast_copy_ha(struct ast_ha *from, struct ast_ha *to)
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{
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memcpy(&to->netaddr, &from->netaddr, sizeof(from->netaddr));
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memcpy(&to->netmask, &from->netmask, sizeof(from->netmask));
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to->sense = from->sense;
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}
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/* Create duplicate of ha structure */
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static struct ast_ha *ast_duplicate_ha(struct ast_ha *original)
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{
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struct ast_ha *new_ha = malloc(sizeof(struct ast_ha));
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/* Copy from original to new object */
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ast_copy_ha(original, new_ha);
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return(new_ha);
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}
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/* Create duplicate HA link list */
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/* Used in chan_sip2 templates */
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struct ast_ha *ast_duplicate_ha_list(struct ast_ha *original)
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{
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struct ast_ha *start=original;
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struct ast_ha *ret = NULL;
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struct ast_ha *link,*prev=NULL;
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while(start) {
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link = ast_duplicate_ha(start); /* Create copy of this object */
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if (prev)
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prev->next = link; /* Link previous to this object */
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if (!ret)
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ret = link; /* Save starting point */
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start = start->next; /* Go to next object */
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prev = link; /* Save pointer to this object */
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}
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return (ret); /* Return start of list */
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}
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struct ast_ha *ast_append_ha(char *sense, char *stuff, struct ast_ha *path)
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{
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struct ast_ha *ha = malloc(sizeof(struct ast_ha));
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char *nm="255.255.255.255";
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char tmp[256] = "";
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struct ast_ha *prev = NULL;
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struct ast_ha *ret;
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int x,z;
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unsigned int y;
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ret = path;
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while(path) {
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prev = path;
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path = path->next;
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}
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if (ha) {
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strncpy(tmp, stuff, sizeof(tmp) - 1);
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nm = strchr(tmp, '/');
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if (!nm)
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nm = "255.255.255.255";
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else {
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*nm = '\0';
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nm++;
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}
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if (!strchr(nm, '.')) {
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if ((sscanf(nm, "%i", &x) == 1) && (x >= 0) && (x <= 32)) {
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y = 0;
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for (z=0;z<x;z++) {
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y >>= 1;
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y |= 0x80000000;
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}
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ha->netmask.s_addr = htonl(y);
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}
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} else if (!inet_aton(nm, &ha->netmask)) {
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ast_log(LOG_WARNING, "%s not a valid netmask\n", nm);
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free(ha);
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return path;
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}
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if (!inet_aton(tmp, &ha->netaddr)) {
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ast_log(LOG_WARNING, "%s not a valid IP\n", tmp);
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free(ha);
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return path;
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}
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ha->netaddr.s_addr &= ha->netmask.s_addr;
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if (!strncasecmp(sense, "p", 1)) {
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ha->sense = AST_SENSE_ALLOW;
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} else {
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ha->sense = AST_SENSE_DENY;
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}
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ha->next = NULL;
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if (prev)
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prev->next = ha;
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else
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ret = ha;
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}
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ast_log(LOG_DEBUG, "%s/%s appended to acl for peer\n",stuff, nm);
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return ret;
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}
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int ast_apply_ha(struct ast_ha *ha, struct sockaddr_in *sin)
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{
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/* Start optimistic */
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int res = AST_SENSE_ALLOW;
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while(ha) {
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char iabuf[INET_ADDRSTRLEN];
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char iabuf2[INET_ADDRSTRLEN];
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/* DEBUG */
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ast_log(LOG_DEBUG,
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"##### Testing %s with %s\n",
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ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr),
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ast_inet_ntoa(iabuf2, sizeof(iabuf2), ha->netaddr));
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/* For each rule, if this address and the netmask = the net address
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apply the current rule */
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if ((sin->sin_addr.s_addr & ha->netmask.s_addr) == (ha->netaddr.s_addr))
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res = ha->sense;
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ha = ha->next;
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}
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return res;
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}
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int ast_get_ip_or_srv(struct sockaddr_in *sin, const char *value, const char *service)
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{
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struct hostent *hp;
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struct ast_hostent ahp;
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char srv[256];
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char host[256];
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int tportno = ntohs(sin->sin_port);
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if (service) {
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snprintf(srv, sizeof(srv), "%s.%s", service, value);
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if (ast_get_srv(NULL, host, sizeof(host), &tportno, srv) > 0) {
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sin->sin_port = htons(tportno);
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value = host;
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}
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}
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hp = ast_gethostbyname(value, &ahp);
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if (hp) {
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memcpy(&sin->sin_addr, hp->h_addr, sizeof(sin->sin_addr));
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} else {
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ast_log(LOG_WARNING, "Unable to lookup '%s'\n", value);
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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 ast_get_ip(struct sockaddr_in *sin, const char *value)
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{
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return ast_get_ip_or_srv(sin, value, NULL);
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}
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/* iface is the interface (e.g. eth0); address is the return value */
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int ast_lookup_iface(char *iface, struct in_addr *address) {
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int mysock, res = 0;
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struct my_ifreq ifreq;
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memset(&ifreq, 0, sizeof(ifreq));
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strncpy(ifreq.ifrn_name,iface,sizeof(ifreq.ifrn_name) - 1);
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mysock = socket(PF_INET,SOCK_DGRAM,IPPROTO_IP);
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res = ioctl(mysock,SIOCGIFADDR,&ifreq);
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close(mysock);
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if (res < 0) {
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ast_log(LOG_WARNING, "Unable to get IP of %s: %s\n", iface, strerror(errno));
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memcpy((char *)address,(char *)&__ourip,sizeof(__ourip));
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return -1;
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} else {
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memcpy((char *)address,(char *)&ifreq.ifru_addr.sin_addr,sizeof(ifreq.ifru_addr.sin_addr));
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return 0;
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}
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}
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int ast_ouraddrfor(struct in_addr *them, struct in_addr *us)
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{
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int s;
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struct sockaddr_in sin;
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socklen_t slen;
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s = socket(PF_INET, SOCK_DGRAM, 0);
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if (s == -1) {
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ast_log(LOG_WARNING, "Cannot create socket\n");
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return -1;
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}
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sin.sin_family = AF_INET;
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sin.sin_port = 5060;
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sin.sin_addr = *them;
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if (connect(s, (struct sockaddr *)&sin, sizeof(sin))) {
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ast_log(LOG_WARNING, "Cannot connect\n");
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close(s);
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return -1;
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}
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slen = sizeof(sin);
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if (getsockname(s, (struct sockaddr *)&sin, &slen)) {
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ast_log(LOG_WARNING, "Cannot get socket name\n");
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close(s);
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return -1;
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}
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close(s);
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*us = sin.sin_addr;
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return 0;
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}
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