mirror of https://gerrit.osmocom.org/libosmocore
445 lines
12 KiB
C
445 lines
12 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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* 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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*/
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/*! \file socket.c
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* \brief Osmocom socket convenience functions
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*/
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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 <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 <netinet/in.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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/*! \brief Initialize a socket (including bind/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] host remote host name or IP address in string form
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* \param[in] 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 or connects it, depending on
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* the value of \a flags parameter.
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*/
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int osmo_sock_init(uint16_t family, uint16_t type, uint8_t proto,
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const char *host, uint16_t port, unsigned int flags)
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{
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struct addrinfo hints, *result, *rp;
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int sfd, rc, on = 1;
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char portbuf[16];
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if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) ==
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(OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) {
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LOGP(DLGLOBAL, LOGL_ERROR, "invalid: both bind and connect flags set:"
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" %s:%u\n", host, port);
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return -EINVAL;
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}
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sprintf(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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*/
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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 (flags & OSMO_SOCK_F_BIND)
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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 -EINVAL;
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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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sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
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if (sfd == -1)
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continue;
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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:"
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" %s:%u: %s\n",
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host, port, strerror(errno));
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close(sfd);
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freeaddrinfo(result);
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return -EINVAL;
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}
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}
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if (flags & OSMO_SOCK_F_CONNECT) {
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rc = connect(sfd, rp->ai_addr, rp->ai_addrlen);
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if (rc != -1 || (rc == -1 && errno == EINPROGRESS))
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break;
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} else {
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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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host, port, strerror(errno));
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break;
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}
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if (bind(sfd, rp->ai_addr, rp->ai_addrlen) != -1)
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break;
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}
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close(sfd);
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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, "unable to connect/bind socket: %s:%u: %s\n",
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host, port, strerror(errno));
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return -ENODEV;
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}
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setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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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) {
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switch (type) {
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case SOCK_STREAM:
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case SOCK_SEQPACKET:
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listen(sfd, 10);
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break;
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}
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}
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return sfd;
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}
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/*! \brief fill \ref osmo_fd for a give sfd
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* \param[out] ofd file descriptor (will be filled in)
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* \param[in] sfd socket file descriptor
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* \returns socket fd on success; negative on error
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*
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* This function fills the \a ofd structure.
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*/
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static inline int osmo_fd_init_ofd(struct osmo_fd *ofd, int sfd)
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{
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int rc;
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if (sfd < 0)
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return sfd;
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ofd->fd = sfd;
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ofd->when = BSC_FD_READ;
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rc = osmo_fd_register(ofd);
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if (rc < 0) {
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close(sfd);
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return rc;
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}
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return sfd;
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}
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/*! \brief Initialize a socket and fill \ref osmo_fd
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* \param[out] ofd file descriptor (will be filled in)
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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] host remote host name or IP address in string form
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* \param[in] 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 fd on success; negative on error
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*
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* This function creates (and optionall binds/connects) a socket using
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* \ref osmo_sock_init, but also fills the \a ofd structure.
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*/
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int osmo_sock_init_ofd(struct osmo_fd *ofd, int family, int type, int proto,
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const char *host, uint16_t port, unsigned int flags)
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{
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return osmo_fd_init_ofd(ofd, osmo_sock_init(family, type, proto, host, port, flags));
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}
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/*! \brief Initialize a socket and fill \ref sockaddr
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* \param[out] ss socket address (will be filled in)
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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] flags flags like \ref OSMO_SOCK_F_CONNECT
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* \returns socket fd on success; negative on error
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*
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* This function creates (and optionall binds/connects) a socket using
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* \ref osmo_sock_init, but also fills the \a ss structure.
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*/
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int osmo_sock_init_sa(struct sockaddr *ss, uint16_t type,
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uint8_t proto, unsigned int flags)
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{
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char host[NI_MAXHOST];
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uint16_t port;
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struct sockaddr_in *sin;
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struct sockaddr_in6 *sin6;
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int s, sa_len;
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/* determine port and host from ss */
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switch (ss->sa_family) {
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case AF_INET:
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sin = (struct sockaddr_in *) ss;
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sa_len = sizeof(struct sockaddr_in);
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port = ntohs(sin->sin_port);
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break;
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *) ss;
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sa_len = sizeof(struct sockaddr_in6);
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port = ntohs(sin6->sin6_port);
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break;
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default:
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return -EINVAL;
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}
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s = getnameinfo(ss, sa_len, host, NI_MAXHOST,
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NULL, 0, NI_NUMERICHOST);
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if (s != 0) {
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LOGP(DLGLOBAL, LOGL_ERROR, "getnameinfo failed:"
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" %s\n", strerror(errno));
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return s;
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}
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return osmo_sock_init(ss->sa_family, type, proto, host, port, flags);
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}
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static int sockaddr_equal(const struct sockaddr *a,
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const struct sockaddr *b, unsigned int len)
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{
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struct sockaddr_in *sin_a, *sin_b;
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struct sockaddr_in6 *sin6_a, *sin6_b;
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if (a->sa_family != b->sa_family)
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return 0;
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switch (a->sa_family) {
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case AF_INET:
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sin_a = (struct sockaddr_in *)a;
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sin_b = (struct sockaddr_in *)b;
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if (!memcmp(&sin_a->sin_addr, &sin_b->sin_addr,
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sizeof(struct in_addr)))
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return 1;
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break;
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case AF_INET6:
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sin6_a = (struct sockaddr_in6 *)a;
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sin6_b = (struct sockaddr_in6 *)b;
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if (!memcmp(&sin6_a->sin6_addr, &sin6_b->sin6_addr,
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sizeof(struct in6_addr)))
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return 1;
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break;
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}
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return 0;
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}
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/*! \brief Determine if the given address is a local address
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* \param[in] addr Socket Address
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* \param[in] addrlen Length of socket address in bytes
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* \returns 1 if address is local, 0 otherwise.
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*/
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int osmo_sockaddr_is_local(struct sockaddr *addr, unsigned int addrlen)
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{
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struct ifaddrs *ifaddr, *ifa;
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if (getifaddrs(&ifaddr) == -1) {
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LOGP(DLGLOBAL, LOGL_ERROR, "getifaddrs:"
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" %s\n", strerror(errno));
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return -EIO;
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}
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for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
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if (!ifa->ifa_addr)
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continue;
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if (sockaddr_equal(ifa->ifa_addr, addr, addrlen))
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return 1;
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}
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return 0;
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}
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/*! \brief Initialize a unix domain socket (including bind/connect)
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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] socket_path path to identify the socket
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* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
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* \returns socket fd on success; negative on error
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*
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* This function creates a new unix domain socket, \a
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* type and \a proto and optionally binds or connects it, depending on
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* the value of \a flags parameter.
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*/
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int osmo_sock_unix_init(uint16_t type, uint8_t proto,
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const char *socket_path, unsigned int flags)
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{
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struct sockaddr_un local;
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int sfd, rc, on = 1;
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unsigned int namelen;
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if ((flags & (OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT)) ==
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(OSMO_SOCK_F_BIND | OSMO_SOCK_F_CONNECT))
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return -EINVAL;
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local.sun_family = AF_UNIX;
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strncpy(local.sun_path, socket_path, sizeof(local.sun_path));
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local.sun_path[sizeof(local.sun_path) - 1] = '\0';
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#if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
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local.sun_len = strlen(local.sun_path);
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#endif
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#if defined(BSD44SOCKETS) || defined(SUN_LEN)
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namelen = SUN_LEN(&local);
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#else
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namelen = strlen(local.sun_path) +
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offsetof(struct sockaddr_un, sun_path);
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#endif
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sfd = socket(AF_UNIX, type, proto);
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if (sfd < 0)
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return -1;
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if (flags & OSMO_SOCK_F_CONNECT) {
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rc = connect(sfd, (struct sockaddr *)&local, namelen);
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if (rc < 0)
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goto err;
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} else {
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unlink(local.sun_path);
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rc = bind(sfd, (struct sockaddr *)&local, namelen);
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if (rc < 0)
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goto err;
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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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return -EINVAL;
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}
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}
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if (flags & OSMO_SOCK_F_BIND) {
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rc = listen(sfd, 10);
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if (rc < 0)
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goto err;
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}
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return sfd;
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err:
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close(sfd);
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return -1;
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}
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/*! \brief Initialize a unix domain socket and fill \ref osmo_fd
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* \param[out] ofd file descriptor (will be filled in)
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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] socket_path path to identify the socket
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* \param[in] flags flags like \ref OSMO_SOCK_F_CONNECT
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* \returns socket fd on success; negative on error
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*
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* This function creates (and optionall binds/connects) a socket using
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* \ref osmo_sock_unix_init, but also fills the \a ofd structure.
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*/
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int osmo_sock_unix_init_ofd(struct osmo_fd *ofd, uint16_t type, uint8_t proto,
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const char *socket_path, unsigned int flags)
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{
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return osmo_fd_init_ofd(ofd, osmo_sock_unix_init(type, proto, socket_path, flags));
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}
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/*! \brief Get address/port information on soocket in dyn-alloc string
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* \param[in] ctx talloc context from which to allocate string buffer
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* \param[in] fd file descriptor of socket
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* \returns string identifying the connection of this socket
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*/
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char *osmo_sock_get_name(void *ctx, int fd)
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{
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struct sockaddr sa_l, sa_r;
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socklen_t sa_len_l = sizeof(sa_l);
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socklen_t sa_len_r = sizeof(sa_r);
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char hostbuf_l[64], hostbuf_r[64];
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char portbuf_l[16], portbuf_r[16];
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int rc;
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rc = getsockname(fd, &sa_l, &sa_len_l);
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if (rc < 0)
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return NULL;
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rc = getnameinfo(&sa_l, sa_len_l, hostbuf_l, sizeof(hostbuf_l),
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portbuf_l, sizeof(portbuf_l),
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NI_NUMERICHOST | NI_NUMERICSERV);
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if (rc < 0)
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return NULL;
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rc = getpeername(fd, &sa_r, &sa_len_r);
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if (rc < 0)
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goto local_only;
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rc = getnameinfo(&sa_r, sa_len_r, hostbuf_r, sizeof(hostbuf_r),
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portbuf_r, sizeof(portbuf_r),
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NI_NUMERICHOST | NI_NUMERICSERV);
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if (rc < 0)
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goto local_only;
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return talloc_asprintf(ctx, "(%s:%s<->%s:%s)", hostbuf_r, portbuf_r,
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hostbuf_l, portbuf_l);
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local_only:
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return talloc_asprintf(ctx, "(NULL<->%s:%s)", hostbuf_l, portbuf_l);
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}
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#endif /* HAVE_SYS_SOCKET_H */
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/*! @} */
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