+/*
+ * 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"
-int usock(int type, const char *host, const char *service) {
- int sock = -1;
+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 (service && !(type & USOCK_UNIX)) {
- struct addrinfo *result, *rp;
-
- struct addrinfo hints = {
- .ai_family = (type & USOCK_IPV6ONLY) ? AF_INET6 :
- (type & USOCK_IPV4ONLY) ? AF_INET : AF_UNSPEC,
- .ai_socktype = ((type & 0xff) == USOCK_TCP)
- ? SOCK_STREAM : SOCK_DGRAM,
- .ai_flags = AI_ADDRCONFIG
- | ((type & USOCK_SERVER) ? AI_PASSIVE : 0)
- | ((type & USOCK_NUMERIC) ? AI_NUMERICHOST : 0),
- };
-
- if (getaddrinfo(host, service, &hints, &result)) {
- return -1;
- }
+ if (type & USOCK_NONBLOCK)
+ fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_NONBLOCK);
+}
- for (rp = result; rp != NULL; rp = rp->ai_next) {
- if ((sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol))
- == -1) {
- continue;
- }
+static int usock_connect(int type, struct sockaddr *sa, int sa_len, int family, int socktype, bool server)
+{
+ int sock;
- if (!(type & USOCK_NOCLOEXEC)) {
- fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC);
- }
+ sock = socket(family, socktype, 0);
+ if (sock < 0)
+ return -1;
- if (type & USOCK_NONBLOCK) {
- fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_NONBLOCK);
- }
+ usock_set_flags(sock, type);
- if (type & USOCK_SERVER) {
- const int one = 1;
- setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
-
- if (!bind(sock, rp->ai_addr, rp->ai_addrlen)
- && ((type & 0xff) != USOCK_TCP || !listen(sock, SOMAXCONN))) {
- break;
- }
- } else {
- if (!connect(sock, rp->ai_addr, rp->ai_addrlen)
- || errno == EINPROGRESS) {
- break;
- }
- }
+ if (server) {
+ const int one = 1;
+ setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
- close(sock);
- sock = -1;
- }
- freeaddrinfo(result);
+ if (!bind(sock, sa, sa_len) &&
+ (socktype != SOCK_STREAM || !listen(sock, SOMAXCONN)))
+ return sock;
} else {
- struct sockaddr_un sun = {.sun_family = AF_UNIX};
- if (strlen(host) >= sizeof(sun.sun_path)) {
- errno = EINVAL;
- return -1;
- }
- strcpy(sun.sun_path, host);
+ if (!connect(sock, sa, sa_len) || errno == EINPROGRESS)
+ return sock;
+ }
- if ((sock = socket(AF_UNIX, ((type & 0xff) == USOCK_TCP)
- ? SOCK_STREAM : SOCK_DGRAM, 0)) == -1) {
- return -1;
- }
+ 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);
+}
- if (!(type & USOCK_NOCLOEXEC)) {
- fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC);
+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;
+ }
- if (type & USOCK_NONBLOCK) {
- fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_NONBLOCK);
+ 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 (type & USOCK_SERVER) {
- if (bind(sock, (struct sockaddr*)&sun, sizeof(sun)) ||
- ((type & 0xff) == USOCK_TCP && listen(sock, SOMAXCONN))) {
- close(sock);
- return -1;
- }
- } else {
- if (connect(sock, (struct sockaddr*)&sun, sizeof(sun))
- && errno != EINPROGRESS) {
- close(sock);
- return -1;
+ 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;
+}
projects / project / libubox.git / blobdiff