Mirror of the official OpenWrt libubox repository https://git.openwrt.org/project/libubox
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/*
* usock - socket helper functions
*
* Copyright (C) 2010 Steven Barth <steven@midlink.org>
* Copyright (C) 2011-2012 Felix Fietkau <nbd@openwrt.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
#include <poll.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include <poll.h>
#include "usock.h"
#include "utils.h"
static void usock_set_flags(int sock, unsigned int type)
{
if (!(type & USOCK_NOCLOEXEC))
fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC);
if (type & USOCK_NONBLOCK)
fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_NONBLOCK);
}
static int usock_connect(int type, struct sockaddr *sa, int sa_len, int family, int socktype, bool server)
{
int sock;
sock = socket(family, socktype, 0);
if (sock < 0)
return -1;
usock_set_flags(sock, type);
if (server) {
const int one = 1;
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
if (!bind(sock, sa, sa_len) &&
(socktype != SOCK_STREAM || !listen(sock, SOMAXCONN)))
return sock;
} else {
if (!connect(sock, sa, sa_len) || errno == EINPROGRESS)
return sock;
}
close(sock);
return -1;
}
static int usock_unix(int type, const char *host)
{
struct sockaddr_un sun = {.sun_family = AF_UNIX};
bool server = !!(type & USOCK_SERVER);
int socktype = ((type & 0xff) == USOCK_TCP) ? SOCK_STREAM : SOCK_DGRAM;
if (strlen(host) >= sizeof(sun.sun_path)) {
errno = EINVAL;
return -1;
}
strcpy(sun.sun_path, host);
return usock_connect(type, (struct sockaddr*)&sun, sizeof(sun), AF_UNIX, socktype, server);
}
static int
usock_inet_notimeout(int type, struct addrinfo *result, void *addr)
{
struct addrinfo *rp;
int socktype = ((type & 0xff) == USOCK_TCP) ? SOCK_STREAM : SOCK_DGRAM;
bool server = !!(type & USOCK_SERVER);
int sock;
for (rp = result; rp != NULL; rp = rp->ai_next) {
sock = usock_connect(type, rp->ai_addr, rp->ai_addrlen, rp->ai_family, socktype, server);
if (sock >= 0) {
if (addr)
memcpy(addr, rp->ai_addr, rp->ai_addrlen);
return sock;
}
}
return -1;
}
static int poll_restart(struct pollfd *fds, int nfds, int timeout)
{
struct timespec ts, cur;
int msec = timeout % 1000;
int ret;
clock_gettime(CLOCK_MONOTONIC, &ts);
ts.tv_nsec += msec * 1000000;
if (ts.tv_nsec > 1000000000) {
ts.tv_sec++;
ts.tv_nsec -= 1000000000;
}
ts.tv_sec += timeout / 1000;
while (1) {
ret = poll(fds, nfds, timeout);
if (ret == EAGAIN)
continue;
if (ret != EINTR)
return ret;
clock_gettime(CLOCK_MONOTONIC, &cur);
timeout = (ts.tv_sec - cur.tv_sec) * 1000;
timeout += (ts.tv_nsec - cur.tv_nsec) / 1000000;
if (timeout <= 0)
return 0;
}
}
int usock_inet_timeout(int type, const char *host, const char *service,
void *addr, int timeout)
{
int socktype = ((type & 0xff) == USOCK_TCP) ? SOCK_STREAM : SOCK_DGRAM;
bool server = !!(type & USOCK_SERVER);
struct addrinfo *result, *rp;
struct addrinfo hints = {
.ai_family = (type & USOCK_IPV6ONLY) ? AF_INET6 :
(type & USOCK_IPV4ONLY) ? AF_INET : AF_UNSPEC,
.ai_socktype = socktype,
.ai_flags = AI_ADDRCONFIG
| ((type & USOCK_SERVER) ? AI_PASSIVE : 0)
| ((type & USOCK_NUMERIC) ? AI_NUMERICHOST : 0),
};
struct addrinfo *rp_v6 = NULL;
struct addrinfo *rp_v4 = NULL;
struct pollfd pfds[2] = {
{ .fd = -1, .events = POLLOUT },
{ .fd = -1, .events = POLLOUT },
};
int sock = -1;
int i;
if (getaddrinfo(host, service, &hints, &result))
return -1;
if (timeout <= 0 || server) {
sock = usock_inet_notimeout(type, result, addr);
goto free_addrinfo;
}
for (rp = result; rp != NULL; rp = rp->ai_next) {
if (rp->ai_family == AF_INET6 && !rp_v6)
rp_v6 = rp;
if (rp->ai_family == AF_INET && !rp_v4)
rp_v4 = rp;
}
if (!rp_v6 && !rp_v4)
goto out;
if (rp_v6) {
rp = rp_v6;
pfds[0].fd = usock_connect(type | USOCK_NONBLOCK, rp->ai_addr,
rp->ai_addrlen, rp->ai_family,
socktype, server);
if (pfds[0].fd < 0) {
rp_v6 = NULL;
goto try_v4;
}
if (timeout > 300) {
if (poll_restart(pfds, 1, 300) == 1) {
rp = rp_v6;
sock = pfds[0].fd;
goto out;
}
}
timeout -= 300;
}
try_v4:
if (rp_v4) {
rp = rp_v4;
pfds[1].fd = usock_connect(type | USOCK_NONBLOCK, rp->ai_addr,
rp->ai_addrlen, rp->ai_family,
socktype, server);
if (pfds[1].fd < 0) {
rp_v4 = NULL;
if (!rp_v6)
goto out;
goto wait;
}
}
wait:
poll_restart(pfds + !rp_v6, !!rp_v6 + !!rp_v4, timeout);
if (pfds[0].revents & POLLOUT) {
rp = rp_v6;
sock = pfds[0].fd;
goto out;
}
if (pfds[1].revents & POLLOUT) {
rp = rp_v4;
sock = pfds[1].fd;
goto out;
}
out:
for (i = 0; i < 2; i++) {
int fd = pfds[i].fd;
if (fd >= 0 && fd != sock)
close(fd);
}
if (!(type & USOCK_NONBLOCK))
fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) & ~O_NONBLOCK);
if (addr && sock >= 0)
memcpy(addr, rp->ai_addr, rp->ai_addrlen);
free_addrinfo:
freeaddrinfo(result);
return sock;
}
const char *usock_port(int port)
{
static char buffer[sizeof("65535\0")];
if (port < 0 || port > 65535)
return NULL;
snprintf(buffer, sizeof(buffer), "%u", port);
return buffer;
}
int usock(int type, const char *host, const char *service) {
int sock;
if (type & USOCK_UNIX)
sock = usock_unix(type, host);
else
sock = usock_inet(type, host, service, NULL);
if (sock < 0)
return -1;
return sock;
}
int usock_wait_ready(int fd, int msecs) {
struct pollfd fds[1];
int res;
fds[0].fd = fd;
fds[0].events = POLLOUT;
res = poll(fds, 1, msecs);
if (res < 0) {
return errno;
} else if (res == 0) {
return -ETIMEDOUT;
} else {
int err = 0;
socklen_t optlen = sizeof(err);
res = getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &optlen);
if (res)
return errno;
if (err)
return err;
}
return 0;
}