asterisk/main/netsock2.c

700 lines
17 KiB
C

/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2010, Digium, Inc.
*
* Viagénie <asteriskv6@viagenie.ca>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Network socket handling
*
* \author Viagénie <asteriskv6@viagenie.ca>
*/
/*** MODULEINFO
<support_level>core</support_level>
***/
#include "asterisk.h"
#include "asterisk/config.h"
#include "asterisk/netsock2.h"
#include "asterisk/utils.h"
#include "asterisk/threadstorage.h"
int ast_sockaddr_ipv4_mapped(const struct ast_sockaddr *addr, struct ast_sockaddr *ast_mapped)
{
const struct sockaddr_in6 *sin6;
struct sockaddr_in sin4;
if (!ast_sockaddr_is_ipv6(addr)) {
return 0;
}
if (!ast_sockaddr_is_ipv4_mapped(addr)) {
return 0;
}
sin6 = (const struct sockaddr_in6*)&addr->ss;
memset(&sin4, 0, sizeof(sin4));
sin4.sin_family = AF_INET;
sin4.sin_port = sin6->sin6_port;
sin4.sin_addr.s_addr = ((uint32_t *)&sin6->sin6_addr)[3];
ast_sockaddr_from_sin(ast_mapped, &sin4);
return 1;
}
AST_THREADSTORAGE(ast_sockaddr_stringify_buf);
char *ast_sockaddr_stringify_fmt(const struct ast_sockaddr *sa, int format)
{
struct ast_sockaddr sa_ipv4;
const struct ast_sockaddr *sa_tmp;
char host[NI_MAXHOST];
char port[NI_MAXSERV];
struct ast_str *str;
int e;
static const size_t size = sizeof(host) - 1 + sizeof(port) - 1 + 4;
if (ast_sockaddr_isnull(sa)) {
return "(null)";
}
if (!(str = ast_str_thread_get(&ast_sockaddr_stringify_buf, size))) {
return "";
}
if (ast_sockaddr_ipv4_mapped(sa, &sa_ipv4)) {
sa_tmp = &sa_ipv4;
} else {
sa_tmp = sa;
}
if ((e = getnameinfo((struct sockaddr *)&sa_tmp->ss, sa_tmp->len,
format & AST_SOCKADDR_STR_ADDR ? host : NULL,
format & AST_SOCKADDR_STR_ADDR ? sizeof(host) : 0,
format & AST_SOCKADDR_STR_PORT ? port : 0,
format & AST_SOCKADDR_STR_PORT ? sizeof(port): 0,
NI_NUMERICHOST | NI_NUMERICSERV))) {
ast_log(LOG_ERROR, "getnameinfo(): %s\n", gai_strerror(e));
return "";
}
if ((format & AST_SOCKADDR_STR_REMOTE) == AST_SOCKADDR_STR_REMOTE) {
char *p;
if (ast_sockaddr_is_ipv6_link_local(sa) && (p = strchr(host, '%'))) {
*p = '\0';
}
}
switch ((format & AST_SOCKADDR_STR_FORMAT_MASK)) {
case AST_SOCKADDR_STR_DEFAULT:
ast_str_set(&str, 0, sa_tmp->ss.ss_family == AF_INET6 ?
"[%s]:%s" : "%s:%s", host, port);
break;
case AST_SOCKADDR_STR_ADDR:
ast_str_set(&str, 0, "%s", host);
break;
case AST_SOCKADDR_STR_HOST:
ast_str_set(&str, 0,
sa_tmp->ss.ss_family == AF_INET6 ? "[%s]" : "%s", host);
break;
case AST_SOCKADDR_STR_PORT:
ast_str_set(&str, 0, "%s", port);
break;
default:
ast_log(LOG_ERROR, "Invalid format\n");
return "";
}
return ast_str_buffer(str);
}
int ast_sockaddr_cidr_bits(const struct ast_sockaddr *sa)
{
struct ast_sockaddr sa_ipv4;
const struct ast_sockaddr *sa_tmp;
int bits = 0;
int bytes;
int i;
int j;
char *addr;
if (ast_sockaddr_isnull(sa)) {
return 0;
}
if (ast_sockaddr_ipv4_mapped(sa, &sa_ipv4)) {
sa_tmp = &sa_ipv4;
} else {
sa_tmp = sa;
}
bytes = sa_tmp->len;
addr = ((struct sockaddr *)&sa_tmp->ss)->sa_data;
for (i = 0; i < bytes ; ++i) {
for (j = 0; j < 8; ++j) {
if ((addr[i] >> j) & 1) {
bits++;
}
}
}
return bits;
}
int ast_sockaddr_split_hostport(char *str, char **host, char **port, int flags)
{
char *s = str;
char *orig_str = str;/* Original string in case the port presence is incorrect. */
char *host_end = NULL;/* Delay terminating the host in case the port presence is incorrect. */
ast_debug(5, "Splitting '%s' into...\n", str);
*host = NULL;
*port = NULL;
if (*s == '[') {
*host = ++s;
for (; *s && *s != ']'; ++s) {
}
if (*s == ']') {
host_end = s;
++s;
}
if (*s == ':') {
*port = s + 1;
}
} else {
*host = s;
for (; *s; ++s) {
if (*s == ':') {
if (*port) {
*port = NULL;
break;
} else {
*port = s;
}
}
}
if (*port) {
host_end = *port;
++*port;
}
}
switch (flags & PARSE_PORT_MASK) {
case PARSE_PORT_IGNORE:
*port = NULL;
break;
case PARSE_PORT_REQUIRE:
if (*port == NULL) {
ast_log(LOG_WARNING, "Port missing in %s\n", orig_str);
return 0;
}
break;
case PARSE_PORT_FORBID:
if (*port != NULL) {
ast_log(LOG_WARNING, "Port disallowed in %s\n", orig_str);
return 0;
}
break;
}
/* Can terminate the host string now if needed. */
if (host_end) {
*host_end = '\0';
}
ast_debug(5, "...host '%s' and port '%s'.\n", *host, *port ? *port : "");
return 1;
}
int ast_sockaddr_parse(struct ast_sockaddr *addr, const char *str, int flags)
{
struct addrinfo hints;
struct addrinfo *res;
char *s;
char *host;
char *port;
int e;
s = ast_strdupa(str);
if (!ast_sockaddr_split_hostport(s, &host, &port, flags)) {
return 0;
}
memset(&hints, 0, sizeof(hints));
/* Hint to get only one entry from getaddrinfo */
hints.ai_socktype = SOCK_DGRAM;
#ifdef AI_NUMERICSERV
hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
#else
hints.ai_flags = AI_NUMERICHOST;
#endif
if ((e = getaddrinfo(host, port, &hints, &res))) {
if (e != EAI_NONAME) { /* if this was just a host name rather than a ip address, don't print error */
ast_log(LOG_ERROR, "getaddrinfo(\"%s\", \"%s\", ...): %s\n",
host, S_OR(port, "(null)"), gai_strerror(e));
}
return 0;
}
/*
* I don't see how this could be possible since we're not resolving host
* names. But let's be careful...
*/
if (res->ai_next != NULL) {
ast_log(LOG_WARNING, "getaddrinfo() returned multiple "
"addresses. Ignoring all but the first.\n");
}
if (addr) {
addr->len = res->ai_addrlen;
memcpy(&addr->ss, res->ai_addr, addr->len);
}
freeaddrinfo(res);
return 1;
}
int ast_sockaddr_resolve(struct ast_sockaddr **addrs, const char *str,
int flags, int family)
{
struct addrinfo hints, *res, *ai;
char *s, *host, *port;
int e, i, res_cnt;
if (!str) {
*addrs = NULL;
return 0;
}
s = ast_strdupa(str);
if (!ast_sockaddr_split_hostport(s, &host, &port, flags)) {
*addrs = NULL;
return 0;
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = family;
hints.ai_socktype = SOCK_DGRAM;
if ((e = getaddrinfo(host, port, &hints, &res))) {
ast_log(LOG_ERROR, "getaddrinfo(\"%s\", \"%s\", ...): %s\n",
host, S_OR(port, "(null)"), gai_strerror(e));
*addrs = NULL;
return 0;
}
res_cnt = 0;
for (ai = res; ai; ai = ai->ai_next) {
res_cnt++;
}
if (res_cnt == 0) {
*addrs = NULL;
goto cleanup;
}
if ((*addrs = ast_malloc(res_cnt * sizeof(struct ast_sockaddr))) == NULL) {
res_cnt = 0;
goto cleanup;
}
i = 0;
for (ai = res; ai; ai = ai->ai_next) {
(*addrs)[i].len = ai->ai_addrlen;
memcpy(&(*addrs)[i].ss, ai->ai_addr, ai->ai_addrlen);
++i;
}
cleanup:
freeaddrinfo(res);
return res_cnt;
}
/*! \brief Pulls first resolved address and returns it */
int ast_sockaddr_resolve_first_af(struct ast_sockaddr *addr,
const char* name, int flag, int family)
{
struct ast_sockaddr *addrs;
int addrs_cnt;
addrs_cnt = ast_sockaddr_resolve(&addrs, name, flag, family);
if (addrs_cnt <= 0) {
return 1;
}
if (addrs_cnt > 1) {
ast_debug(1, "Multiple addresses resolving %s, using the first one only\n", name);
}
ast_sockaddr_copy(addr, &addrs[0]);
ast_free(addrs);
return 0;
}
int ast_sockaddr_apply_netmask(const struct ast_sockaddr *addr, const struct ast_sockaddr *netmask,
struct ast_sockaddr *result)
{
int res = 0;
if (ast_sockaddr_is_ipv4(addr)) {
struct sockaddr_in result4 = { 0, };
struct sockaddr_in *addr4 = (struct sockaddr_in *) &addr->ss;
struct sockaddr_in *mask4 = (struct sockaddr_in *) &netmask->ss;
result4.sin_family = AF_INET;
result4.sin_addr.s_addr = addr4->sin_addr.s_addr & mask4->sin_addr.s_addr;
ast_sockaddr_from_sin(result, &result4);
} else if (ast_sockaddr_is_ipv6(addr)) {
struct sockaddr_in6 result6 = { 0, };
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &addr->ss;
struct sockaddr_in6 *mask6 = (struct sockaddr_in6 *) &netmask->ss;
int i;
result6.sin6_family = AF_INET6;
for (i = 0; i < 4; ++i) {
V6_WORD(&result6, i) = V6_WORD(addr6, i) & V6_WORD(mask6, i);
}
memcpy(&result->ss, &result6, sizeof(result6));
result->len = sizeof(result6);
} else {
/* Unsupported address scheme */
res = -1;
}
return res;
}
int ast_sockaddr_cmp(const struct ast_sockaddr *a, const struct ast_sockaddr *b)
{
const struct ast_sockaddr *a_tmp, *b_tmp;
struct ast_sockaddr ipv4_mapped;
a_tmp = a;
b_tmp = b;
if (a_tmp->len != b_tmp->len) {
if (ast_sockaddr_ipv4_mapped(a, &ipv4_mapped)) {
a_tmp = &ipv4_mapped;
} else if (ast_sockaddr_ipv4_mapped(b, &ipv4_mapped)) {
b_tmp = &ipv4_mapped;
}
}
if (a_tmp->len < b_tmp->len) {
return -1;
} else if (a_tmp->len > b_tmp->len) {
return 1;
}
return memcmp(&a_tmp->ss, &b_tmp->ss, a_tmp->len);
}
int ast_sockaddr_cmp_addr(const struct ast_sockaddr *a, const struct ast_sockaddr *b)
{
const struct ast_sockaddr *a_tmp, *b_tmp;
struct ast_sockaddr ipv4_mapped;
const struct in_addr *ip4a, *ip4b;
const struct in6_addr *ip6a, *ip6b;
int ret = -1;
a_tmp = a;
b_tmp = b;
if (a_tmp->len != b_tmp->len) {
if (ast_sockaddr_ipv4_mapped(a, &ipv4_mapped)) {
a_tmp = &ipv4_mapped;
} else if (ast_sockaddr_ipv4_mapped(b, &ipv4_mapped)) {
b_tmp = &ipv4_mapped;
}
}
if (a->len < b->len) {
ret = -1;
} else if (a->len > b->len) {
ret = 1;
}
switch (a_tmp->ss.ss_family) {
case AF_INET:
ip4a = &((const struct sockaddr_in*)&a_tmp->ss)->sin_addr;
ip4b = &((const struct sockaddr_in*)&b_tmp->ss)->sin_addr;
ret = memcmp(ip4a, ip4b, sizeof(*ip4a));
break;
case AF_INET6:
ip6a = &((const struct sockaddr_in6*)&a_tmp->ss)->sin6_addr;
ip6b = &((const struct sockaddr_in6*)&b_tmp->ss)->sin6_addr;
ret = memcmp(ip6a, ip6b, sizeof(*ip6a));
break;
}
return ret;
}
uint16_t _ast_sockaddr_port(const struct ast_sockaddr *addr, const char *file, int line, const char *func)
{
/*
* Test addr->len first to be tolerant of an ast_sockaddr_setnull()
* addr. In that case addr->len might be the only value initialized.
*/
if (addr->len == sizeof(struct sockaddr_in)
&& addr->ss.ss_family == AF_INET) {
return ntohs(((struct sockaddr_in *)&addr->ss)->sin_port);
}
if (addr->len == sizeof(struct sockaddr_in6)
&& addr->ss.ss_family == AF_INET6) {
return ntohs(((struct sockaddr_in6 *)&addr->ss)->sin6_port);
}
if (DEBUG_ATLEAST(1)) {
ast_log(__LOG_DEBUG, file, line, func, "Not an IPv4 nor IPv6 address, cannot get port.\n");
}
return 0;
}
void _ast_sockaddr_set_port(struct ast_sockaddr *addr, uint16_t port, const char *file, int line, const char *func)
{
/*
* Test addr->len first to be tolerant of an ast_sockaddr_setnull()
* addr. In that case addr->len might be the only value initialized.
*/
if (addr->len == sizeof(struct sockaddr_in)
&& addr->ss.ss_family == AF_INET) {
((struct sockaddr_in *)&addr->ss)->sin_port = htons(port);
} else if (addr->len == sizeof(struct sockaddr_in6)
&& addr->ss.ss_family == AF_INET6) {
((struct sockaddr_in6 *)&addr->ss)->sin6_port = htons(port);
} else if (DEBUG_ATLEAST(1)) {
ast_log(__LOG_DEBUG, file, line, func,
"Not an IPv4 nor IPv6 address, cannot set port.\n");
}
}
uint32_t ast_sockaddr_ipv4(const struct ast_sockaddr *addr)
{
const struct sockaddr_in *sin = (struct sockaddr_in *)&addr->ss;
return ntohl(sin->sin_addr.s_addr);
}
int ast_sockaddr_is_ipv4(const struct ast_sockaddr *addr)
{
/*
* Test addr->len first to be tolerant of an ast_sockaddr_setnull()
* addr. In that case addr->len might be the only value initialized.
*/
return addr->len == sizeof(struct sockaddr_in)
&& addr->ss.ss_family == AF_INET;
}
int ast_sockaddr_is_ipv4_mapped(const struct ast_sockaddr *addr)
{
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr->ss;
return addr->len && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr);
}
int ast_sockaddr_is_ipv4_multicast(const struct ast_sockaddr *addr)
{
return ((ast_sockaddr_ipv4(addr) & 0xf0000000) == 0xe0000000);
}
int ast_sockaddr_is_ipv6_link_local(const struct ast_sockaddr *addr)
{
const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr->ss;
return ast_sockaddr_is_ipv6(addr) && IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr);
}
int ast_sockaddr_is_ipv6(const struct ast_sockaddr *addr)
{
/*
* Test addr->len first to be tolerant of an ast_sockaddr_setnull()
* addr. In that case addr->len might be the only value initialized.
*/
return addr->len == sizeof(struct sockaddr_in6)
&& addr->ss.ss_family == AF_INET6;
}
int ast_sockaddr_is_any(const struct ast_sockaddr *addr)
{
union {
struct sockaddr_storage ss;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
} tmp_addr = {
.ss = addr->ss,
};
return (ast_sockaddr_is_ipv4(addr) && (tmp_addr.sin.sin_addr.s_addr == INADDR_ANY)) ||
(ast_sockaddr_is_ipv6(addr) && IN6_IS_ADDR_UNSPECIFIED(&tmp_addr.sin6.sin6_addr));
}
int ast_sockaddr_hash(const struct ast_sockaddr *addr)
{
/*
* For IPv4, return the IP address as-is. For IPv6, return the last 32
* bits.
*/
switch (addr->ss.ss_family) {
case AF_INET:
return ((const struct sockaddr_in *)&addr->ss)->sin_addr.s_addr;
case AF_INET6:
return ((uint32_t *)&((const struct sockaddr_in6 *)&addr->ss)->sin6_addr)[3];
default:
ast_log(LOG_ERROR, "Unknown address family '%d'.\n",
addr->ss.ss_family);
return 0;
}
}
const char *ast_transport2str(enum ast_transport transport)
{
switch (transport) {
case AST_TRANSPORT_TLS:
return "TLS";
case AST_TRANSPORT_UDP:
return "UDP";
case AST_TRANSPORT_TCP:
return "TCP";
case AST_TRANSPORT_WS:
return "WS";
case AST_TRANSPORT_WSS:
return "WSS";
}
return "Undefined";
}
int ast_accept(int sockfd, struct ast_sockaddr *addr)
{
addr->len = sizeof(addr->ss);
return accept(sockfd, (struct sockaddr *)&addr->ss, &addr->len);
}
int ast_bind(int sockfd, const struct ast_sockaddr *addr)
{
return bind(sockfd, (const struct sockaddr *)&addr->ss, addr->len);
}
int ast_connect(int sockfd, const struct ast_sockaddr *addr)
{
return connect(sockfd, (const struct sockaddr *)&addr->ss, addr->len);
}
int ast_getsockname(int sockfd, struct ast_sockaddr *addr)
{
addr->len = sizeof(addr->ss);
return getsockname(sockfd, (struct sockaddr *)&addr->ss, &addr->len);
}
ssize_t ast_recvfrom(int sockfd, void *buf, size_t len, int flags,
struct ast_sockaddr *src_addr)
{
src_addr->len = sizeof(src_addr->ss);
return recvfrom(sockfd, buf, len, flags,
(struct sockaddr *)&src_addr->ss, &src_addr->len);
}
ssize_t ast_sendto(int sockfd, const void *buf, size_t len, int flags,
const struct ast_sockaddr *dest_addr)
{
return sendto(sockfd, buf, len, flags,
(const struct sockaddr *)&dest_addr->ss, dest_addr->len);
}
int ast_set_qos(int sockfd, int tos, int cos, const char *desc)
{
int res = 0;
int set_tos;
int set_tclass;
struct ast_sockaddr addr;
/* If the sock address is IPv6, the TCLASS field must be set. */
set_tclass = !ast_getsockname(sockfd, &addr) && ast_sockaddr_is_ipv6(&addr) ? 1 : 0;
/* If the sock address is IPv4 or (IPv6 set to any address [::]) set TOS bits */
set_tos = (!set_tclass || (set_tclass && ast_sockaddr_is_any(&addr))) ? 1 : 0;
if (set_tos) {
if ((res = setsockopt(sockfd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)))) {
ast_log(LOG_WARNING, "Unable to set %s DSCP TOS value to %d (may be you have no "
"root privileges): %s\n", desc, tos, strerror(errno));
} else if (tos) {
ast_verb(2, "Using %s TOS bits %d\n", desc, tos);
}
}
#if defined(IPV6_TCLASS) && defined(IPPROTO_IPV6)
if (set_tclass) {
if (!ast_getsockname(sockfd, &addr) && ast_sockaddr_is_ipv6(&addr)) {
if ((res = setsockopt(sockfd, IPPROTO_IPV6, IPV6_TCLASS, &tos, sizeof(tos)))) {
ast_log(LOG_WARNING, "Unable to set %s DSCP TCLASS field to %d (may be you have no "
"root privileges): %s\n", desc, tos, strerror(errno));
} else if (tos) {
ast_verb(2, "Using %s TOS bits %d in TCLASS field.\n", desc, tos);
}
}
}
#endif
#ifdef linux
if (setsockopt(sockfd, SOL_SOCKET, SO_PRIORITY, &cos, sizeof(cos))) {
ast_log(LOG_WARNING, "Unable to set %s CoS to %d: %s\n", desc, cos,
strerror(errno));
} else if (cos) {
ast_verb(2, "Using %s CoS mark %d\n", desc, cos);
}
#endif
return res;
}
int _ast_sockaddr_to_sin(const struct ast_sockaddr *addr,
struct sockaddr_in *sin, const char *file, int line, const char *func)
{
if (ast_sockaddr_isnull(addr)) {
memset(sin, 0, sizeof(*sin));
return 1;
}
if (addr->len != sizeof(*sin)) {
ast_log(__LOG_ERROR, file, line, func, "Bad address cast to IPv4\n");
return 0;
}
if (addr->ss.ss_family != AF_INET && DEBUG_ATLEAST(1)) {
ast_log(__LOG_DEBUG, file, line, func, "Address family is not AF_INET\n");
}
*sin = *(struct sockaddr_in *)&addr->ss;
return 1;
}
void _ast_sockaddr_from_sin(struct ast_sockaddr *addr, const struct sockaddr_in *sin,
const char *file, int line, const char *func)
{
memcpy(&addr->ss, sin, sizeof(*sin));
if (addr->ss.ss_family != AF_INET && DEBUG_ATLEAST(1)) {
ast_log(__LOG_DEBUG, file, line, func, "Address family is not AF_INET\n");
}
addr->len = sizeof(*sin);
}