2 * usock - socket helper functions
4 * Copyright (C) 2010 Steven Barth <steven@midlink.org>
5 * Copyright (C) 2011-2012 Felix Fietkau <nbd@openwrt.org>
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <sys/types.h>
20 #include <sys/socket.h>
34 static void usock_set_flags(int sock, unsigned int type)
36 if (!(type & USOCK_NOCLOEXEC))
37 fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC);
39 if (type & USOCK_NONBLOCK)
40 fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_NONBLOCK);
43 static int usock_connect(int type, struct sockaddr *sa, int sa_len, int family, int socktype, bool server)
47 sock = socket(family, socktype, 0);
51 usock_set_flags(sock, type);
55 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
57 if (!bind(sock, sa, sa_len) &&
58 (socktype != SOCK_STREAM || !listen(sock, SOMAXCONN)))
61 if (!connect(sock, sa, sa_len) || errno == EINPROGRESS)
69 static int usock_unix(int type, const char *host, int socktype, bool server)
71 struct sockaddr_un sun = {.sun_family = AF_UNIX};
73 if (strlen(host) >= sizeof(sun.sun_path)) {
77 strcpy(sun.sun_path, host);
79 return usock_connect(type, (struct sockaddr*)&sun, sizeof(sun), AF_UNIX, socktype, server);
82 static int usock_inet(int type, const char *host, const char *service, int socktype, bool server)
84 struct addrinfo *result, *rp;
85 struct addrinfo hints = {
86 .ai_family = (type & USOCK_IPV6ONLY) ? AF_INET6 :
87 (type & USOCK_IPV4ONLY) ? AF_INET : AF_UNSPEC,
88 .ai_socktype = socktype,
89 .ai_flags = AI_ADDRCONFIG
90 | ((type & USOCK_SERVER) ? AI_PASSIVE : 0)
91 | ((type & USOCK_NUMERIC) ? AI_NUMERICHOST : 0),
95 if (getaddrinfo(host, service, &hints, &result))
98 for (rp = result; rp != NULL; rp = rp->ai_next) {
99 sock = usock_connect(type, rp->ai_addr, rp->ai_addrlen, rp->ai_family, socktype, server);
104 freeaddrinfo(result);
108 const char *usock_port(int port)
110 static char buffer[sizeof("65535\0")];
112 if (port < 0 || port > 65535)
115 snprintf(buffer, sizeof(buffer), "%u", port);
120 int usock(int type, const char *host, const char *service) {
121 int socktype = ((type & 0xff) == USOCK_TCP) ? SOCK_STREAM : SOCK_DGRAM;
122 bool server = !!(type & USOCK_SERVER);
125 if (type & USOCK_UNIX)
126 sock = usock_unix(type, host, socktype, server);
128 sock = usock_inet(type, host, service, socktype, server);
136 int usock_wait_ready(int fd, int msecs) {
137 struct pollfd fds[1];
141 fds[0].events = POLLOUT;
143 res = poll(fds, 1, msecs);
146 } else if (res == 0) {
150 socklen_t optlen = sizeof(err);
152 res = getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &optlen);