mirror of https://gerrit.osmocom.org/libosmocore
1343 lines
41 KiB
C
1343 lines
41 KiB
C
/*
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* (C) 2011-2017 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include "../config.h"
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/*! \addtogroup socket
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* @{
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* Osmocom socket convenience functions.
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*
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* \file socket.c */
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#ifdef HAVE_SYS_SOCKET_H
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#include <osmocom/core/logging.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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#include <netdb.h>
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#include <ifaddrs.h>
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#ifdef HAVE_LIBSCTP
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#include <netinet/sctp.h>
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#endif
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static struct addrinfo *addrinfo_helper(uint16_t family, uint16_t type, uint8_t proto,
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const char *host, uint16_t port, bool passive)
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{
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struct addrinfo hints, *result, *rp;
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char portbuf[6];
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int rc;
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snprintf(portbuf, sizeof(portbuf), "%u", port);
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memset(&hints, 0, sizeof(struct addrinfo));
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hints.ai_family = family;
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if (type == SOCK_RAW) {
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/* Workaround for glibc, that returns EAI_SERVICE (-8) if
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* SOCK_RAW and IPPROTO_GRE is used.
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* http://sourceware.org/bugzilla/show_bug.cgi?id=15015
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*/
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hints.ai_socktype = SOCK_DGRAM;
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hints.ai_protocol = IPPROTO_UDP;
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} else {
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hints.ai_socktype = type;
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hints.ai_protocol = proto;
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}
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if (passive)
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hints.ai_flags |= AI_PASSIVE;
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rc = getaddrinfo(host, portbuf, &hints, &result);
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if (rc != 0) {
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LOGP(DLGLOBAL, LOGL_ERROR, "getaddrinfo returned NULL: %s:%u: %s\n",
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host, port, strerror(errno));
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return NULL;
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}
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for (rp = result; rp != NULL; rp = rp->ai_next) {
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/* Workaround for glibc again */
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if (type == SOCK_RAW) {
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rp->ai_socktype = SOCK_RAW;
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rp->ai_protocol = proto;
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}
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}
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return result;
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}
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#ifdef HAVE_LIBSCTP
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/*! Retrieve an array of addrinfo with specified hints, one for each host in the hosts array.
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* \param[out] addrinfo array of addrinfo pointers, will be filled by the function on success.
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* Its size must be at least the one of hosts.
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* \param[in] family Socket family like AF_INET, AF_INET6.
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* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM.
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* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP.
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* \param[in] hosts array of char pointers (strings) containing the addresses to query.
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* \param[in] host_cnt length of the hosts array (in items).
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* \param[in] port port number in host byte order.
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* \param[in] passive whether to include the AI_PASSIVE flag in getaddrinfo() hints.
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* \returns 0 is returned on success together with a filled addrinfo array; negative on error
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*/
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static int addrinfo_helper_multi(struct addrinfo **addrinfo, uint16_t family, uint16_t type, uint8_t proto,
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const char **hosts, size_t host_cnt, uint16_t port, bool passive)
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{
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int i, j;
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for (i = 0; i < host_cnt; i++) {
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addrinfo[i] = addrinfo_helper(family, type, proto, hosts[i], port, passive);
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if (!addrinfo[i]) {
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for (j = 0; j < i; j++)
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freeaddrinfo(addrinfo[j]);
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return -EINVAL;
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}
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}
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return 0;
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}
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#endif /* HAVE_LIBSCTP*/
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static int socket_helper(const struct addrinfo *rp, unsigned int flags)
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{
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int sfd, on = 1;
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sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
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if (sfd == -1) {
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LOGP(DLGLOBAL, LOGL_ERROR,
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"unable to create socket: %s\n", strerror(errno));
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return sfd;
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}
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if (flags & OSMO_SOCK_F_NONBLOCK) {
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if (ioctl(sfd, FIONBIO, (unsigned char *)&on) < 0) {
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LOGP(DLGLOBAL, LOGL_ERROR,
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"cannot set this socket unblocking: %s\n",
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strerror(errno));
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close(sfd);
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sfd = -EINVAL;
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}
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}
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return sfd;
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}
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#ifdef HAVE_LIBSCTP
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/* Fill buf with a string representation of the address set, in the form:
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* buf_len == 0: "()"
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* buf_len == 1: "hostA"
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* buf_len >= 2: (hostA|hostB|...|...)
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*/
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static int multiaddr_snprintf(char* buf, size_t buf_len, const char **hosts, size_t host_cnt)
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{
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int len = 0, offset = 0, rem = buf_len;
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int ret, i;
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char *after;
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if (buf_len < 3)
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return -EINVAL;
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if (host_cnt != 1) {
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ret = snprintf(buf, rem, "(");
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if (ret < 0)
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return ret;
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OSMO_SNPRINTF_RET(ret, rem, offset, len);
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}
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for (i = 0; i < host_cnt; i++) {
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if (host_cnt == 1)
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after = "";
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else
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after = (i == (host_cnt - 1)) ? ")" : "|";
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ret = snprintf(buf + offset, rem, "%s%s", hosts[i] ? : "0.0.0.0", after);
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OSMO_SNPRINTF_RET(ret, rem, offset, len);
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}
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return len;
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}
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#endif /* HAVE_LIBSCTP */
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static int osmo_sock_init_tail(int fd, uint16_t type, unsigned int flags)
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{
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int rc;
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/* Make sure to call 'listen' on a bound, connection-oriented sock */
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if ((flags & (OSMO_SOCK_F_BIND|OSMO_SOCK_F_CONNECT)) == OSMO_SOCK_F_BIND) {
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switch (type) {
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case SOCK_STREAM:
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case SOCK_SEQPACKET:
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rc = listen(fd, 10);
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if (rc < 0) {
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LOGP(DLGLOBAL, LOGL_ERROR, "unable to listen on socket: %s\n",
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strerror(errno));
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return rc;
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}
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break;
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}
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}
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if (flags & OSMO_SOCK_F_NO_MCAST_LOOP) {
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rc = osmo_sock_mcast_loop_set(fd, false);
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if (rc < 0) {
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LOGP(DLGLOBAL, LOGL_ERROR, "unable to disable multicast loop: %s\n",
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strerror(errno));
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return rc;
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}
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}
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if (flags & OSMO_SOCK_F_NO_MCAST_ALL) {
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rc = osmo_sock_mcast_all_set(fd, false);
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if (rc < 0) {
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LOGP(DLGLOBAL, LOGL_ERROR, "unable to disable receive of all multicast: %s\n",
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strerror(errno));
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/* do not abort here, as this is just an
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* optional additional optimization that only
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* exists on Linux only */
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}
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}
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return 0;
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}
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/*! Initialize a socket (including bind and/or connect)
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* \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC
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* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
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* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
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* \param[in] local_host local host name or IP address in string form
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* \param[in] local_port local port number in host byte order
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* \param[in] remote_host remote host name or IP address in string form
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* \param[in] remote_port remote port number in host byte order
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* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
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* \returns socket file descriptor on success; negative on error
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*
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* This function creates a new socket of the designated \a family, \a
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* type and \a proto and optionally binds it to the \a local_host and \a
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* local_port as well as optionally connects it to the \a remote_host
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* and \q remote_port, depending on the value * of \a flags parameter.
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*
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* As opposed to \ref osmo_sock_init(), this function allows to combine
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* the \ref OSMO_SOCK_F_BIND and \ref OSMO_SOCK_F_CONNECT flags. This
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* is useful if you want to connect to a remote host/port, but still
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* want to bind that socket to either a specific local alias IP and/or a
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* specific local source port.
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*
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* You must specify either \ref OSMO_SOCK_F_BIND, or \ref
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* OSMO_SOCK_F_CONNECT, or both.
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*
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* If \ref OSMO_SOCK_F_NONBLOCK is specified, the socket will be set to
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* non-blocking mode.
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*/
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int osmo_sock_init2(uint16_t family, uint16_t type, uint8_t proto,
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const char *local_host, uint16_t local_port,
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const char *remote_host, uint16_t remote_port, unsigned int flags)
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{
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struct addrinfo *result, *rp;
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int sfd = -1, rc, on = 1;
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if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == 0) {
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LOGP(DLGLOBAL, LOGL_ERROR, "invalid: you have to specify either "
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"BIND or CONNECT flags\n");
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return -EINVAL;
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}
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/* figure out local side of socket */
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if (flags & OSMO_SOCK_F_BIND) {
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result = addrinfo_helper(family, type, proto, local_host, local_port, true);
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if (!result)
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return -EINVAL;
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for (rp = result; rp != NULL; rp = rp->ai_next) {
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sfd = socket_helper(rp, flags);
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if (sfd < 0)
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continue;
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if (proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR) {
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rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR,
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&on, sizeof(on));
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if (rc < 0) {
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LOGP(DLGLOBAL, LOGL_ERROR,
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"cannot setsockopt socket:"
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" %s:%u: %s\n",
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local_host, local_port,
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strerror(errno));
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close(sfd);
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continue;
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}
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}
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if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == -1) {
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LOGP(DLGLOBAL, LOGL_ERROR, "unable to bind socket: %s:%u: %s\n",
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local_host, local_port, strerror(errno));
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close(sfd);
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continue;
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}
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break;
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}
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freeaddrinfo(result);
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if (rp == NULL) {
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LOGP(DLGLOBAL, LOGL_ERROR, "no suitable local addr found for: %s:%u\n",
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local_host, local_port);
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return -ENODEV;
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}
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}
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/* Reached this point, if OSMO_SOCK_F_BIND then sfd is valid (>=0) or it
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was already closed and func returned. If OSMO_SOCK_F_BIND is not
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set, then sfd = -1 */
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/* figure out remote side of socket */
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if (flags & OSMO_SOCK_F_CONNECT) {
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result = addrinfo_helper(family, type, proto, remote_host, remote_port, false);
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if (!result) {
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if (sfd >= 0)
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close(sfd);
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return -EINVAL;
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}
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for (rp = result; rp != NULL; rp = rp->ai_next) {
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if (sfd < 0) {
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sfd = socket_helper(rp, flags);
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if (sfd < 0)
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continue;
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}
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rc = connect(sfd, rp->ai_addr, rp->ai_addrlen);
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if (rc != 0 && errno != EINPROGRESS) {
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LOGP(DLGLOBAL, LOGL_ERROR, "unable to connect socket: %s:%u: %s\n",
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remote_host, remote_port, strerror(errno));
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/* We want to maintain the bind socket if bind was enabled */
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if (!(flags & OSMO_SOCK_F_BIND)) {
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close(sfd);
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sfd = -1;
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}
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continue;
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}
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break;
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}
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freeaddrinfo(result);
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if (rp == NULL) {
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LOGP(DLGLOBAL, LOGL_ERROR, "no suitable remote addr found for: %s:%u\n",
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remote_host, remote_port);
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if (sfd >= 0)
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close(sfd);
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return -ENODEV;
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}
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}
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rc = osmo_sock_init_tail(sfd, type, flags);
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if (rc < 0) {
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close(sfd);
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sfd = -1;
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}
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return sfd;
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}
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#ifdef HAVE_LIBSCTP
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/* Build array of addresses taking first addrinfo result of the requested family
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* for each host in hosts. addrs4 or addrs6 are filled based on family type. */
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static int addrinfo_to_sockaddr(uint16_t family, const struct addrinfo **result,
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const char **hosts, int host_cont,
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struct sockaddr_in *addrs4, struct sockaddr_in6 *addrs6) {
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size_t host_idx;
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const struct addrinfo *rp;
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OSMO_ASSERT(family == AF_INET || family == AF_INET6);
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for (host_idx = 0; host_idx < host_cont; host_idx++) {
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for (rp = result[host_idx]; rp != NULL; rp = rp->ai_next) {
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if (rp->ai_family != family)
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continue;
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if (family == AF_INET)
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memcpy(&addrs4[host_idx], rp->ai_addr, sizeof(addrs4[host_idx]));
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else
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memcpy(&addrs6[host_idx], rp->ai_addr, sizeof(addrs6[host_idx]));
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break;
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}
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if (!rp) { /* No addr could be bound for this host! */
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LOGP(DLGLOBAL, LOGL_ERROR, "No suitable remote address found for host: %s\n",
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hosts[host_idx]);
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return -ENODEV;
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}
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}
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return 0;
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}
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/*! Initialize a socket (including bind and/or connect) with multiple local or remote addresses.
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* \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC
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* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
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* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
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* \param[in] local_hosts array of char pointers (strings), each containing local host name or IP address in string form
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* \param[in] local_hosts_cnt length of local_hosts (in items)
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* \param[in] local_port local port number in host byte order
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* \param[in] remote_host array of char pointers (strings), each containing remote host name or IP address in string form
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* \param[in] remote_hosts_cnt length of remote_hosts (in items)
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* \param[in] remote_port remote port number in host byte order
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* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
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* \returns socket file descriptor on success; negative on error
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*
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* This function is similar to \ref osmo_sock_init2(), but can be passed an
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* array of local or remote addresses for protocols supporting multiple
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* addresses per socket, like SCTP (currently only one supported). This function
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* should not be used by protocols not supporting this kind of features, but
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* rather \ref osmo_sock_init2() should be used instead.
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* See \ref osmo_sock_init2() for more information on flags and general behavior.
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*/
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int osmo_sock_init2_multiaddr(uint16_t family, uint16_t type, uint8_t proto,
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const char **local_hosts, size_t local_hosts_cnt, uint16_t local_port,
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const char **remote_hosts, size_t remote_hosts_cnt, uint16_t remote_port,
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unsigned int flags)
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{
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struct addrinfo *result[OSMO_SOCK_MAX_ADDRS];
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int sfd = -1, rc, on = 1;
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int i;
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struct sockaddr_in addrs4[OSMO_SOCK_MAX_ADDRS];
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struct sockaddr_in6 addrs6[OSMO_SOCK_MAX_ADDRS];
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struct sockaddr *addrs;
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char strbuf[512];
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|
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/* TODO: So far this function is only aimed for SCTP, but could be
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reused in the future for other protocols with multi-addr support */
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if (proto != IPPROTO_SCTP)
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return -ENOTSUP;
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/* TODO: Let's not support AF_UNSPEC for now. sctp_bindx() actually
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supports binding both types of addresses on a AF_INET6 soscket, but
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that would mean we could get both AF_INET and AF_INET6 addresses for
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each host, and makes complexity of this function increase a lot since
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we'd need to find out which subsets to use, use v4v6 mapped socket,
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etc. */
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if (family == AF_UNSPEC)
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return -ENOTSUP;
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if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) == 0) {
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LOGP(DLGLOBAL, LOGL_ERROR, "invalid: you have to specify either "
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"BIND or CONNECT flags\n");
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return -EINVAL;
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}
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|
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if (((flags & OSMO_SOCK_F_BIND) && !local_hosts_cnt) ||
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((flags & OSMO_SOCK_F_CONNECT) && !remote_hosts_cnt) ||
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local_hosts_cnt > OSMO_SOCK_MAX_ADDRS ||
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remote_hosts_cnt > OSMO_SOCK_MAX_ADDRS)
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return -EINVAL;
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|
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/* figure out local side of socket */
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if (flags & OSMO_SOCK_F_BIND) {
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rc = addrinfo_helper_multi(result, family, type, proto, local_hosts,
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local_hosts_cnt, local_port, true);
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if (rc < 0)
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return -EINVAL;
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|
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/* Since addrinfo_helper sets ai_family, socktype and
|
|
ai_protocol in hints, we know all results will use same
|
|
values, so simply pick the first one and pass it to create
|
|
the socket:
|
|
*/
|
|
sfd = socket_helper(result[0], flags);
|
|
if (sfd < 0) {
|
|
for (i = 0; i < local_hosts_cnt; i++)
|
|
freeaddrinfo(result[i]);
|
|
return sfd;
|
|
}
|
|
|
|
/* Since so far we only allow IPPROTO_SCTP in this function,
|
|
no need to check below for "proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR" */
|
|
rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR,
|
|
&on, sizeof(on));
|
|
if (rc < 0) {
|
|
multiaddr_snprintf(strbuf, sizeof(strbuf), local_hosts, local_hosts_cnt);
|
|
LOGP(DLGLOBAL, LOGL_ERROR,
|
|
"cannot setsockopt socket:"
|
|
" %s:%u: %s\n",
|
|
strbuf, local_port,
|
|
strerror(errno));
|
|
for (i = 0; i < local_hosts_cnt; i++)
|
|
freeaddrinfo(result[i]);
|
|
close(sfd);
|
|
return rc;
|
|
}
|
|
|
|
/* Build array of addresses taking first of same family for each host.
|
|
TODO: Ideally we should use backtracking storing last used
|
|
indexes and trying next combination if connect() fails .*/
|
|
rc = addrinfo_to_sockaddr(family, (const struct addrinfo **)result,
|
|
local_hosts, local_hosts_cnt, addrs4, addrs6);
|
|
if (rc < 0) {
|
|
for (i = 0; i < local_hosts_cnt; i++)
|
|
freeaddrinfo(result[i]);
|
|
close(sfd);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (family == AF_INET)
|
|
addrs = (struct sockaddr *)addrs4;
|
|
else
|
|
addrs = (struct sockaddr *)addrs6;
|
|
if (sctp_bindx(sfd, addrs, local_hosts_cnt, SCTP_BINDX_ADD_ADDR) == -1) {
|
|
multiaddr_snprintf(strbuf, sizeof(strbuf), local_hosts, local_hosts_cnt);
|
|
LOGP(DLGLOBAL, LOGL_NOTICE, "unable to bind socket: %s:%u: %s\n",
|
|
strbuf, local_port, strerror(errno));
|
|
for (i = 0; i < local_hosts_cnt; i++)
|
|
freeaddrinfo(result[i]);
|
|
close(sfd);
|
|
return -ENODEV;
|
|
}
|
|
for (i = 0; i < local_hosts_cnt; i++)
|
|
freeaddrinfo(result[i]);
|
|
}
|
|
|
|
/* Reached this point, if OSMO_SOCK_F_BIND then sfd is valid (>=0) or it
|
|
was already closed and func returned. If OSMO_SOCK_F_BIND is not
|
|
set, then sfd = -1 */
|
|
|
|
/* figure out remote side of socket */
|
|
if (flags & OSMO_SOCK_F_CONNECT) {
|
|
rc = addrinfo_helper_multi(result, family, type, proto, remote_hosts,
|
|
remote_hosts_cnt, remote_port, false);
|
|
if (rc < 0) {
|
|
if (sfd >= 0)
|
|
close(sfd);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (sfd < 0) {
|
|
/* Since addrinfo_helper sets ai_family, socktype and
|
|
ai_protocol in hints, we know all results will use same
|
|
values, so simply pick the first one and pass it to create
|
|
the socket:
|
|
*/
|
|
sfd = socket_helper(result[0], flags);
|
|
if (sfd < 0) {
|
|
for (i = 0; i < remote_hosts_cnt; i++)
|
|
freeaddrinfo(result[i]);
|
|
return sfd;
|
|
}
|
|
}
|
|
|
|
/* Build array of addresses taking first of same family for each host.
|
|
TODO: Ideally we should use backtracking storing last used
|
|
indexes and trying next combination if connect() fails .*/
|
|
rc = addrinfo_to_sockaddr(family, (const struct addrinfo **)result,
|
|
remote_hosts, remote_hosts_cnt, addrs4, addrs6);
|
|
if (rc < 0) {
|
|
for (i = 0; i < remote_hosts_cnt; i++)
|
|
freeaddrinfo(result[i]);
|
|
close(sfd);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (family == AF_INET)
|
|
addrs = (struct sockaddr *)addrs4;
|
|
else
|
|
addrs = (struct sockaddr *)addrs6;
|
|
rc = sctp_connectx(sfd, addrs, remote_hosts_cnt, NULL);
|
|
if (rc != 0 && errno != EINPROGRESS) {
|
|
multiaddr_snprintf(strbuf, sizeof(strbuf), remote_hosts, remote_hosts_cnt);
|
|
LOGP(DLGLOBAL, LOGL_ERROR, "unable to connect socket: %s:%u: %s\n",
|
|
strbuf, remote_port, strerror(errno));
|
|
for (i = 0; i < remote_hosts_cnt; i++)
|
|
freeaddrinfo(result[i]);
|
|
close(sfd);
|
|
return -ENODEV;
|
|
}
|
|
for (i = 0; i < remote_hosts_cnt; i++)
|
|
freeaddrinfo(result[i]);
|
|
}
|
|
|
|
rc = osmo_sock_init_tail(sfd, type, flags);
|
|
if (rc < 0) {
|
|
close(sfd);
|
|
sfd = -1;
|
|
}
|
|
|
|
return sfd;
|
|
}
|
|
#endif /* HAVE_LIBSCTP */
|
|
|
|
/*! Initialize a socket (including bind/connect)
|
|
* \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC
|
|
* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
|
|
* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
|
|
* \param[in] host remote host name or IP address in string form
|
|
* \param[in] port remote port number in host byte order
|
|
* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
|
|
* \returns socket file descriptor on success; negative on error
|
|
*
|
|
* This function creates a new socket of the designated \a family, \a
|
|
* type and \a proto and optionally binds or connects it, depending on
|
|
* the value of \a flags parameter.
|
|
*/
|
|
int osmo_sock_init(uint16_t family, uint16_t type, uint8_t proto,
|
|
const char *host, uint16_t port, unsigned int flags)
|
|
{
|
|
struct addrinfo *result, *rp;
|
|
int sfd, rc, on = 1;
|
|
|
|
if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) ==
|
|
(OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) {
|
|
LOGP(DLGLOBAL, LOGL_ERROR, "invalid: both bind and connect flags set:"
|
|
" %s:%u\n", host, port);
|
|
return -EINVAL;
|
|
}
|
|
|
|
result = addrinfo_helper(family, type, proto, host, port, flags & OSMO_SOCK_F_BIND);
|
|
if (!result) {
|
|
LOGP(DLGLOBAL, LOGL_ERROR, "getaddrinfo returned NULL: %s:%u: %s\n",
|
|
host, port, strerror(errno));
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (rp = result; rp != NULL; rp = rp->ai_next) {
|
|
sfd = socket_helper(rp, flags);
|
|
if (sfd == -1)
|
|
continue;
|
|
|
|
if (flags & OSMO_SOCK_F_CONNECT) {
|
|
rc = connect(sfd, rp->ai_addr, rp->ai_addrlen);
|
|
if (rc != 0 && errno != EINPROGRESS) {
|
|
close(sfd);
|
|
continue;
|
|
}
|
|
} else {
|
|
if (proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR) {
|
|
rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR,
|
|
&on, sizeof(on));
|
|
if (rc < 0) {
|
|
LOGP(DLGLOBAL, LOGL_ERROR,
|
|
"cannot setsockopt socket:"
|
|
" %s:%u: %s\n",
|
|
host, port, strerror(errno));
|
|
close(sfd);
|
|
continue;
|
|
}
|
|
}
|
|
if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == -1) {
|
|
LOGP(DLGLOBAL, LOGL_ERROR, "unable to bind socket:"
|
|
"%s:%u: %s\n",
|
|
host, port, strerror(errno));
|
|
close(sfd);
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
freeaddrinfo(result);
|
|
|
|
if (rp == NULL) {
|
|
LOGP(DLGLOBAL, LOGL_ERROR, "no suitable addr found for: %s:%u\n",
|
|
host, port);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (proto != IPPROTO_UDP || flags & OSMO_SOCK_F_UDP_REUSEADDR) {
|
|
rc = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
|
|
if (rc < 0) {
|
|
LOGP(DLGLOBAL, LOGL_ERROR,
|
|
"cannot setsockopt socket: %s:%u: %s\n", host,
|
|
port, strerror(errno));
|
|
close(sfd);
|
|
sfd = -1;
|
|
}
|
|
}
|
|
|
|
rc = osmo_sock_init_tail(sfd, type, flags);
|
|
if (rc < 0) {
|
|
close(sfd);
|
|
sfd = -1;
|
|
}
|
|
|
|
return sfd;
|
|
}
|
|
|
|
/*! fill \ref osmo_fd for a give sfd
|
|
* \param[out] ofd file descriptor (will be filled in)
|
|
* \param[in] sfd socket file descriptor
|
|
* \returns socket fd on success; negative on error
|
|
*
|
|
* This function fills the \a ofd structure.
|
|
*/
|
|
static inline int osmo_fd_init_ofd(struct osmo_fd *ofd, int sfd)
|
|
{
|
|
int rc;
|
|
|
|
if (sfd < 0)
|
|
return sfd;
|
|
|
|
ofd->fd = sfd;
|
|
ofd->when = OSMO_FD_READ;
|
|
|
|
rc = osmo_fd_register(ofd);
|
|
if (rc < 0) {
|
|
close(sfd);
|
|
return rc;
|
|
}
|
|
|
|
return sfd;
|
|
}
|
|
|
|
/*! Initialize a socket and fill \ref osmo_fd
|
|
* \param[out] ofd file descriptor (will be filled in)
|
|
* \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC
|
|
* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
|
|
* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
|
|
* \param[in] host remote host name or IP address in string form
|
|
* \param[in] port remote port number in host byte order
|
|
* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
|
|
* \returns socket fd on success; negative on error
|
|
*
|
|
* This function creates (and optionall binds/connects) a socket using
|
|
* \ref osmo_sock_init, but also fills the \a ofd structure.
|
|
*/
|
|
int osmo_sock_init_ofd(struct osmo_fd *ofd, int family, int type, int proto,
|
|
const char *host, uint16_t port, unsigned int flags)
|
|
{
|
|
return osmo_fd_init_ofd(ofd, osmo_sock_init(family, type, proto, host, port, flags));
|
|
}
|
|
|
|
/*! Initialize a socket and fill \ref osmo_fd
|
|
* \param[out] ofd file descriptor (will be filled in)
|
|
* \param[in] family Address Family like AF_INET, AF_INET6, AF_UNSPEC
|
|
* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
|
|
* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
|
|
* \param[in] local_host local host name or IP address in string form
|
|
* \param[in] local_port local port number in host byte order
|
|
* \param[in] remote_host remote host name or IP address in string form
|
|
* \param[in] remote_port remote port number in host byte order
|
|
* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
|
|
* \returns socket fd on success; negative on error
|
|
*
|
|
* This function creates (and optionall binds/connects) a socket using
|
|
* \ref osmo_sock_init2, but also fills the \a ofd structure.
|
|
*/
|
|
int osmo_sock_init2_ofd(struct osmo_fd *ofd, int family, int type, int proto,
|
|
const char *local_host, uint16_t local_port,
|
|
const char *remote_host, uint16_t remote_port, unsigned int flags)
|
|
{
|
|
return osmo_fd_init_ofd(ofd, osmo_sock_init2(family, type, proto, local_host,
|
|
local_port, remote_host, remote_port, flags));
|
|
}
|
|
|
|
/*! Initialize a socket and fill \ref sockaddr
|
|
* \param[out] ss socket address (will be filled in)
|
|
* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
|
|
* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
|
|
* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
|
|
* \returns socket fd on success; negative on error
|
|
*
|
|
* This function creates (and optionall binds/connects) a socket using
|
|
* \ref osmo_sock_init, but also fills the \a ss structure.
|
|
*/
|
|
int osmo_sock_init_sa(struct sockaddr *ss, uint16_t type,
|
|
uint8_t proto, unsigned int flags)
|
|
{
|
|
char host[NI_MAXHOST];
|
|
uint16_t port;
|
|
struct sockaddr_in *sin;
|
|
struct sockaddr_in6 *sin6;
|
|
int s, sa_len;
|
|
|
|
/* determine port and host from ss */
|
|
switch (ss->sa_family) {
|
|
case AF_INET:
|
|
sin = (struct sockaddr_in *) ss;
|
|
sa_len = sizeof(struct sockaddr_in);
|
|
port = ntohs(sin->sin_port);
|
|
break;
|
|
case AF_INET6:
|
|
sin6 = (struct sockaddr_in6 *) ss;
|
|
sa_len = sizeof(struct sockaddr_in6);
|
|
port = ntohs(sin6->sin6_port);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
s = getnameinfo(ss, sa_len, host, NI_MAXHOST,
|
|
NULL, 0, NI_NUMERICHOST);
|
|
if (s != 0) {
|
|
LOGP(DLGLOBAL, LOGL_ERROR, "getnameinfo failed:"
|
|
" %s\n", strerror(errno));
|
|
return s;
|
|
}
|
|
|
|
return osmo_sock_init(ss->sa_family, type, proto, host, port, flags);
|
|
}
|
|
|
|
static int sockaddr_equal(const struct sockaddr *a,
|
|
const struct sockaddr *b, unsigned int len)
|
|
{
|
|
struct sockaddr_in *sin_a, *sin_b;
|
|
struct sockaddr_in6 *sin6_a, *sin6_b;
|
|
|
|
if (a->sa_family != b->sa_family)
|
|
return 0;
|
|
|
|
switch (a->sa_family) {
|
|
case AF_INET:
|
|
sin_a = (struct sockaddr_in *)a;
|
|
sin_b = (struct sockaddr_in *)b;
|
|
if (!memcmp(&sin_a->sin_addr, &sin_b->sin_addr,
|
|
sizeof(struct in_addr)))
|
|
return 1;
|
|
break;
|
|
case AF_INET6:
|
|
sin6_a = (struct sockaddr_in6 *)a;
|
|
sin6_b = (struct sockaddr_in6 *)b;
|
|
if (!memcmp(&sin6_a->sin6_addr, &sin6_b->sin6_addr,
|
|
sizeof(struct in6_addr)))
|
|
return 1;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*! Determine if the given address is a local address
|
|
* \param[in] addr Socket Address
|
|
* \param[in] addrlen Length of socket address in bytes
|
|
* \returns 1 if address is local, 0 otherwise.
|
|
*/
|
|
int osmo_sockaddr_is_local(struct sockaddr *addr, unsigned int addrlen)
|
|
{
|
|
struct ifaddrs *ifaddr, *ifa;
|
|
|
|
if (getifaddrs(&ifaddr) == -1) {
|
|
LOGP(DLGLOBAL, LOGL_ERROR, "getifaddrs:"
|
|
" %s\n", strerror(errno));
|
|
return -EIO;
|
|
}
|
|
|
|
for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
|
|
if (!ifa->ifa_addr)
|
|
continue;
|
|
if (sockaddr_equal(ifa->ifa_addr, addr, addrlen)) {
|
|
freeifaddrs(ifaddr);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
freeifaddrs(ifaddr);
|
|
return 0;
|
|
}
|
|
|
|
/*! Convert sockaddr_in to IP address as char string and port as uint16_t.
|
|
* \param[out] addr String buffer to write IP address to, or NULL.
|
|
* \param[out] addr_len Size of \a addr.
|
|
* \param[out] port Pointer to uint16_t to write the port number to, or NULL.
|
|
* \param[in] sin Sockaddr to convert.
|
|
* \returns the required string buffer size, like osmo_strlcpy(), or 0 if \a addr is NULL.
|
|
*/
|
|
size_t osmo_sockaddr_in_to_str_and_uint(char *addr, unsigned int addr_len, uint16_t *port,
|
|
const struct sockaddr_in *sin)
|
|
{
|
|
if (port)
|
|
*port = ntohs(sin->sin_port);
|
|
|
|
if (addr)
|
|
return osmo_strlcpy(addr, inet_ntoa(sin->sin_addr), addr_len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*! Convert sockaddr to IP address as char string and port as uint16_t.
|
|
* \param[out] addr String buffer to write IP address to, or NULL.
|
|
* \param[out] addr_len Size of \a addr.
|
|
* \param[out] port Pointer to uint16_t to write the port number to, or NULL.
|
|
* \param[in] sa Sockaddr to convert.
|
|
* \returns the required string buffer size, like osmo_strlcpy(), or 0 if \a addr is NULL.
|
|
*/
|
|
unsigned int osmo_sockaddr_to_str_and_uint(char *addr, unsigned int addr_len, uint16_t *port,
|
|
const struct sockaddr *sa)
|
|
{
|
|
const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
|
|
|
|
return osmo_sockaddr_in_to_str_and_uint(addr, addr_len, port, sin);
|
|
}
|
|
|
|
/*! Initialize a unix domain socket (including bind/connect)
|
|
* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
|
|
* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
|
|
* \param[in] socket_path path to identify the socket
|
|
* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
|
|
* \returns socket fd on success; negative on error
|
|
*
|
|
* This function creates a new unix domain socket, \a
|
|
* type and \a proto and optionally binds or connects it, depending on
|
|
* the value of \a flags parameter.
|
|
*/
|
|
#if defined(__clang__) && defined(SUN_LEN)
|
|
__attribute__((no_sanitize("undefined")))
|
|
#endif
|
|
int osmo_sock_unix_init(uint16_t type, uint8_t proto,
|
|
const char *socket_path, unsigned int flags)
|
|
{
|
|
struct sockaddr_un local;
|
|
int sfd, rc, on = 1;
|
|
unsigned int namelen;
|
|
|
|
if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) ==
|
|
(OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT))
|
|
return -EINVAL;
|
|
|
|
local.sun_family = AF_UNIX;
|
|
/* When an AF_UNIX socket is bound, sun_path should be NUL-terminated. See unix(7) man page. */
|
|
if (osmo_strlcpy(local.sun_path, socket_path, sizeof(local.sun_path)) >= sizeof(local.sun_path)) {
|
|
LOGP(DLGLOBAL, LOGL_ERROR, "Socket path exceeds maximum length of %zd bytes: %s\n",
|
|
sizeof(local.sun_path), socket_path);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
#if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
|
|
local.sun_len = strlen(local.sun_path);
|
|
#endif
|
|
#if defined(BSD44SOCKETS) || defined(SUN_LEN)
|
|
namelen = SUN_LEN(&local);
|
|
#else
|
|
namelen = strlen(local.sun_path) +
|
|
offsetof(struct sockaddr_un, sun_path);
|
|
#endif
|
|
|
|
sfd = socket(AF_UNIX, type, proto);
|
|
if (sfd < 0)
|
|
return -1;
|
|
|
|
if (flags & OSMO_SOCK_F_CONNECT) {
|
|
rc = connect(sfd, (struct sockaddr *)&local, namelen);
|
|
if (rc < 0)
|
|
goto err;
|
|
} else {
|
|
unlink(local.sun_path);
|
|
rc = bind(sfd, (struct sockaddr *)&local, namelen);
|
|
if (rc < 0)
|
|
goto err;
|
|
}
|
|
|
|
if (flags & OSMO_SOCK_F_NONBLOCK) {
|
|
if (ioctl(sfd, FIONBIO, (unsigned char *)&on) < 0) {
|
|
LOGP(DLGLOBAL, LOGL_ERROR,
|
|
"cannot set this socket unblocking: %s\n",
|
|
strerror(errno));
|
|
close(sfd);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
rc = osmo_sock_init_tail(sfd, type, flags);
|
|
if (rc < 0) {
|
|
close(sfd);
|
|
sfd = -1;
|
|
}
|
|
|
|
return sfd;
|
|
err:
|
|
close(sfd);
|
|
return -1;
|
|
}
|
|
|
|
/*! Initialize a unix domain socket and fill \ref osmo_fd
|
|
* \param[out] ofd file descriptor (will be filled in)
|
|
* \param[in] type Socket type like SOCK_DGRAM, SOCK_STREAM
|
|
* \param[in] proto Protocol like IPPROTO_TCP, IPPROTO_UDP
|
|
* \param[in] socket_path path to identify the socket
|
|
* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
|
|
* \returns socket fd on success; negative on error
|
|
*
|
|
* This function creates (and optionally binds/connects) a socket
|
|
* using osmo_sock_unix_init, but also fills the ofd structure.
|
|
*/
|
|
int osmo_sock_unix_init_ofd(struct osmo_fd *ofd, uint16_t type, uint8_t proto,
|
|
const char *socket_path, unsigned int flags)
|
|
{
|
|
return osmo_fd_init_ofd(ofd, osmo_sock_unix_init(type, proto, socket_path, flags));
|
|
}
|
|
|
|
/*! Get the IP and/or port number on socket in separate string buffers.
|
|
* \param[in] fd file descriptor of socket
|
|
* \param[out] ip IP address (will be filled in when not NULL)
|
|
* \param[in] ip_len length of the ip buffer
|
|
* \param[out] port number (will be filled in when not NULL)
|
|
* \param[in] port_len length of the port buffer
|
|
* \param[in] local (true) or remote (false) name will get looked at
|
|
* \returns 0 on success; negative otherwise
|
|
*/
|
|
int osmo_sock_get_ip_and_port(int fd, char *ip, size_t ip_len, char *port, size_t port_len, bool local)
|
|
{
|
|
struct sockaddr sa;
|
|
socklen_t len = sizeof(sa);
|
|
char ipbuf[INET6_ADDRSTRLEN], portbuf[6];
|
|
int rc;
|
|
|
|
rc = local ? getsockname(fd, &sa, &len) : getpeername(fd, &sa, &len);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
rc = getnameinfo(&sa, len, ipbuf, sizeof(ipbuf),
|
|
portbuf, sizeof(portbuf),
|
|
NI_NUMERICHOST | NI_NUMERICSERV);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
if (ip)
|
|
strncpy(ip, ipbuf, ip_len);
|
|
if (port)
|
|
strncpy(port, portbuf, port_len);
|
|
return 0;
|
|
}
|
|
|
|
/*! Get local IP address on socket
|
|
* \param[in] fd file descriptor of socket
|
|
* \param[out] ip IP address (will be filled in)
|
|
* \param[in] len length of the output buffer
|
|
* \returns 0 on success; negative otherwise
|
|
*/
|
|
int osmo_sock_get_local_ip(int fd, char *ip, size_t len)
|
|
{
|
|
return osmo_sock_get_ip_and_port(fd, ip, len, NULL, 0, true);
|
|
}
|
|
|
|
/*! Get local port on socket
|
|
* \param[in] fd file descriptor of socket
|
|
* \param[out] port number (will be filled in)
|
|
* \param[in] len length of the output buffer
|
|
* \returns 0 on success; negative otherwise
|
|
*/
|
|
int osmo_sock_get_local_ip_port(int fd, char *port, size_t len)
|
|
{
|
|
return osmo_sock_get_ip_and_port(fd, NULL, 0, port, len, true);
|
|
}
|
|
|
|
/*! Get remote IP address on socket
|
|
* \param[in] fd file descriptor of socket
|
|
* \param[out] ip IP address (will be filled in)
|
|
* \param[in] len length of the output buffer
|
|
* \returns 0 on success; negative otherwise
|
|
*/
|
|
int osmo_sock_get_remote_ip(int fd, char *ip, size_t len)
|
|
{
|
|
return osmo_sock_get_ip_and_port(fd, ip, len, NULL, 0, false);
|
|
}
|
|
|
|
/*! Get remote port on socket
|
|
* \param[in] fd file descriptor of socket
|
|
* \param[out] port number (will be filled in)
|
|
* \param[in] len length of the output buffer
|
|
* \returns 0 on success; negative otherwise
|
|
*/
|
|
int osmo_sock_get_remote_ip_port(int fd, char *port, size_t len)
|
|
{
|
|
return osmo_sock_get_ip_and_port(fd, NULL, 0, port, len, false);
|
|
}
|
|
|
|
/*! Get address/port information on socket in dyn-alloc string like "(r=1.2.3.4:5<->l=6.7.8.9:10)".
|
|
* Usually, it is better to use osmo_sock_get_name2() for a static string buffer or osmo_sock_get_name_buf() for a
|
|
* caller provided string buffer, to avoid the dynamic talloc allocation.
|
|
* \param[in] ctx talloc context from which to allocate string buffer
|
|
* \param[in] fd file descriptor of socket
|
|
* \returns string identifying the connection of this socket, talloc'd from ctx.
|
|
*/
|
|
char *osmo_sock_get_name(const void *ctx, int fd)
|
|
{
|
|
char str[OSMO_SOCK_NAME_MAXLEN];
|
|
int rc;
|
|
rc = osmo_sock_get_name_buf(str, sizeof(str), fd);
|
|
if (rc <= 0)
|
|
return NULL;
|
|
return talloc_asprintf(ctx, "(%s)", str);
|
|
}
|
|
|
|
/*! Get address/port information on socket in provided string buffer, like "r=1.2.3.4:5<->l=6.7.8.9:10".
|
|
* This does not include braces like osmo_sock_get_name().
|
|
* \param[out] str Destination string buffer.
|
|
* \param[in] str_len sizeof(str).
|
|
* \param[in] fd File descriptor of socket.
|
|
* \return String length as returned by snprintf(), or negative on error.
|
|
*/
|
|
int osmo_sock_get_name_buf(char *str, size_t str_len, int fd)
|
|
{
|
|
char hostbuf_l[INET6_ADDRSTRLEN], hostbuf_r[INET6_ADDRSTRLEN];
|
|
char portbuf_l[6], portbuf_r[6];
|
|
int rc;
|
|
|
|
/* get local */
|
|
if ((rc = osmo_sock_get_ip_and_port(fd, hostbuf_l, sizeof(hostbuf_l), portbuf_l, sizeof(portbuf_l), true))) {
|
|
osmo_strlcpy(str, "<error-in-getsockname>", str_len);
|
|
return rc;
|
|
}
|
|
|
|
/* get remote */
|
|
if (osmo_sock_get_ip_and_port(fd, hostbuf_r, sizeof(hostbuf_r), portbuf_r, sizeof(portbuf_r), false) != 0)
|
|
return snprintf(str, str_len, "r=NULL<->l=%s:%s", hostbuf_l, portbuf_l);
|
|
|
|
return snprintf(str, str_len, "r=%s:%s<->l=%s:%s", hostbuf_r, portbuf_r, hostbuf_l, portbuf_l);
|
|
}
|
|
|
|
/*! Get address/port information on socket in static string, like "r=1.2.3.4:5<->l=6.7.8.9:10".
|
|
* This does not include braces like osmo_sock_get_name().
|
|
* \param[in] fd File descriptor of socket.
|
|
* \return Static string buffer containing the result.
|
|
*/
|
|
const char *osmo_sock_get_name2(int fd)
|
|
{
|
|
static __thread char str[OSMO_SOCK_NAME_MAXLEN];
|
|
osmo_sock_get_name_buf(str, sizeof(str), fd);
|
|
return str;
|
|
}
|
|
|
|
/*! Get address/port information on socket in static string, like "r=1.2.3.4:5<->l=6.7.8.9:10".
|
|
* This does not include braces like osmo_sock_get_name().
|
|
* \param[in] fd File descriptor of socket.
|
|
* \return Static string buffer containing the result.
|
|
*/
|
|
char *osmo_sock_get_name2_c(const void *ctx, int fd)
|
|
{
|
|
char *str = talloc_size(ctx, OSMO_SOCK_NAME_MAXLEN);
|
|
if (!str)
|
|
return NULL;
|
|
osmo_sock_get_name_buf(str, OSMO_SOCK_NAME_MAXLEN, fd);
|
|
return str;
|
|
}
|
|
|
|
static int sock_get_domain(int fd)
|
|
{
|
|
int domain;
|
|
#ifdef SO_DOMAIN
|
|
socklen_t dom_len = sizeof(domain);
|
|
int rc;
|
|
|
|
rc = getsockopt(fd, SOL_SOCKET, SO_DOMAIN, &domain, &dom_len);
|
|
if (rc < 0)
|
|
return rc;
|
|
#else
|
|
/* This of course sucks, but what shall we do on OSs like
|
|
* FreeBSD that don't seem to expose a method by which one can
|
|
* learn the address family of a socket? */
|
|
domain = AF_INET;
|
|
#endif
|
|
return domain;
|
|
}
|
|
|
|
|
|
/*! Activate or de-activate local loop-back of transmitted multicast packets
|
|
* \param[in] fd file descriptor of related socket
|
|
* \param[in] enable Enable (true) or disable (false) loop-back
|
|
* \returns 0 on success; negative otherwise */
|
|
int osmo_sock_mcast_loop_set(int fd, bool enable)
|
|
{
|
|
int domain, loop = 0;
|
|
|
|
if (enable)
|
|
loop = 1;
|
|
|
|
domain = sock_get_domain(fd);
|
|
if (domain < 0)
|
|
return domain;
|
|
|
|
switch (domain) {
|
|
case AF_INET:
|
|
return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop));
|
|
case AF_INET6:
|
|
return setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop, sizeof(loop));
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*! Set the TTL of outbound multicast packets
|
|
* \param[in] fd file descriptor of related socket
|
|
* \param[in] ttl TTL of to-be-sent multicast packets
|
|
* \returns 0 on success; negative otherwise */
|
|
int osmo_sock_mcast_ttl_set(int fd, uint8_t ttl)
|
|
{
|
|
int domain, ttli = ttl;
|
|
|
|
domain = sock_get_domain(fd);
|
|
if (domain < 0)
|
|
return domain;
|
|
|
|
switch (domain) {
|
|
case AF_INET:
|
|
return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttli, sizeof(ttli));
|
|
case AF_INET6:
|
|
return setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttli, sizeof(ttli));
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*! Set the network device to which we should bind the multicast socket
|
|
* \param[in] fd file descriptor of related socket
|
|
* \param[in] ifname name of network interface to user for multicast
|
|
* \returns 0 on success; negative otherwise */
|
|
int osmo_sock_mcast_iface_set(int fd, const char *ifname)
|
|
{
|
|
unsigned int ifindex;
|
|
struct ip_mreqn mr;
|
|
|
|
/* first, resolve interface name to ifindex */
|
|
ifindex = if_nametoindex(ifname);
|
|
if (ifindex == 0)
|
|
return -errno;
|
|
|
|
/* next, configure kernel to use that ifindex for this sockets multicast traffic */
|
|
memset(&mr, 0, sizeof(mr));
|
|
mr.imr_ifindex = ifindex;
|
|
return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, &mr, sizeof(mr));
|
|
}
|
|
|
|
|
|
/*! Enable/disable receiving all multicast packets, even for non-subscribed groups
|
|
* \param[in] fd file descriptor of related socket
|
|
* \param[in] enable Enable or Disable receiving of all packets
|
|
* \returns 0 on success; negative otherwise */
|
|
int osmo_sock_mcast_all_set(int fd, bool enable)
|
|
{
|
|
int domain, all = 0;
|
|
|
|
if (enable)
|
|
all = 1;
|
|
|
|
domain = sock_get_domain(fd);
|
|
if (domain < 0)
|
|
return domain;
|
|
|
|
switch (domain) {
|
|
case AF_INET:
|
|
#ifdef IP_MULTICAST_ALL
|
|
return setsockopt(fd, IPPROTO_IP, IP_MULTICAST_ALL, &all, sizeof(all));
|
|
#endif
|
|
case AF_INET6:
|
|
/* there seems no equivalent ?!? */
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/* FreeBSD calls the socket option differently */
|
|
#if !defined(IPV6_ADD_MEMBERSHIP) && defined(IPV6_JOIN_GROUP)
|
|
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
|
|
#endif
|
|
|
|
/*! Subscribe to the given IP multicast group
|
|
* \param[in] fd file descriptor of related scoket
|
|
* \param[in] grp_addr ASCII representation of the multicast group address
|
|
* \returns 0 on success; negative otherwise */
|
|
int osmo_sock_mcast_subscribe(int fd, const char *grp_addr)
|
|
{
|
|
int rc, domain;
|
|
struct ip_mreq mreq;
|
|
struct ipv6_mreq mreq6;
|
|
struct in6_addr i6a;
|
|
|
|
domain = sock_get_domain(fd);
|
|
if (domain < 0)
|
|
return domain;
|
|
|
|
switch (domain) {
|
|
case AF_INET:
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
mreq.imr_multiaddr.s_addr = inet_addr(grp_addr);
|
|
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
|
|
return setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
|
|
#ifdef IPV6_ADD_MEMBERSHIP
|
|
case AF_INET6:
|
|
memset(&mreq6, 0, sizeof(mreq6));
|
|
rc = inet_pton(AF_INET6, grp_addr, (void *)&i6a);
|
|
if (rc < 0)
|
|
return -EINVAL;
|
|
mreq6.ipv6mr_multiaddr = i6a;
|
|
return setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6));
|
|
#endif
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*! Determine the matching local IP-address for a given remote IP-Address.
|
|
* \param[out] local_ip caller provided memory for resulting local IP-address
|
|
* \param[in] remote_ip remote IP-address
|
|
* \param[in] fd file descriptor of related scoket
|
|
* \returns 0 on success; negative otherwise
|
|
*
|
|
* The function accepts IPv4 and IPv6 address strings. The caller must provide
|
|
* at least INET6_ADDRSTRLEN bytes for local_ip if an IPv6 is expected as
|
|
* as result. For IPv4 addresses the required amount is INET_ADDRSTRLEN. */
|
|
int osmo_sock_local_ip(char *local_ip, const char *remote_ip)
|
|
{
|
|
int sfd;
|
|
int rc;
|
|
struct addrinfo addrinfo_hint;
|
|
struct addrinfo *addrinfo = NULL;
|
|
struct sockaddr_in local_addr;
|
|
socklen_t local_addr_len;
|
|
uint16_t family;
|
|
|
|
/* Find out the address family (AF_INET or AF_INET6?) */
|
|
memset(&addrinfo_hint, '\0', sizeof(addrinfo_hint));
|
|
addrinfo_hint.ai_family = PF_UNSPEC;
|
|
addrinfo_hint.ai_flags = AI_NUMERICHOST;
|
|
rc = getaddrinfo(remote_ip, NULL, &addrinfo_hint, &addrinfo);
|
|
if (rc)
|
|
return -EINVAL;
|
|
family = addrinfo->ai_family;
|
|
freeaddrinfo(addrinfo);
|
|
|
|
/* Connect a dummy socket to trick the kernel into determining the
|
|
* ip-address of the interface that would be used if we would send
|
|
* out an actual packet */
|
|
sfd = osmo_sock_init2(family, SOCK_DGRAM, IPPROTO_UDP, NULL, 0, remote_ip, 0, OSMO_SOCK_F_CONNECT);
|
|
if (sfd < 0)
|
|
return -EINVAL;
|
|
|
|
/* Request the IP address of the interface that the kernel has
|
|
* actually choosen. */
|
|
memset(&local_addr, 0, sizeof(local_addr));
|
|
local_addr_len = sizeof(local_addr);
|
|
rc = getsockname(sfd, (struct sockaddr *)&local_addr, &local_addr_len);
|
|
close(sfd);
|
|
if (rc < 0)
|
|
return -EINVAL;
|
|
if (local_addr.sin_family == AF_INET)
|
|
inet_ntop(AF_INET, &local_addr.sin_addr, local_ip, INET_ADDRSTRLEN);
|
|
else if (local_addr.sin_family == AF_INET6)
|
|
inet_ntop(AF_INET6, &local_addr.sin_addr, local_ip, INET6_ADDRSTRLEN);
|
|
else
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* HAVE_SYS_SOCKET_H */
|
|
|
|
/*! @} */
|