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(struct sockaddr *sa, int sa_len, int family, int socktype, bool server)
47 sock = socket(family, socktype, 0);
53 setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
55 if (!bind(sock, sa, sa_len) &&
56 (socktype != SOCK_STREAM || !listen(sock, SOMAXCONN)))
59 if (!connect(sock, sa, sa_len) || errno == EINPROGRESS)
67 static int usock_unix(const char *host, int socktype, bool server)
69 struct sockaddr_un sun = {.sun_family = AF_UNIX};
71 if (strlen(host) >= sizeof(sun.sun_path)) {
75 strcpy(sun.sun_path, host);
77 return usock_connect((struct sockaddr*)&sun, sizeof(sun), AF_UNIX, socktype, server);
80 static int usock_inet(int type, const char *host, const char *service, int socktype, bool server)
82 struct addrinfo *result, *rp;
83 struct addrinfo hints = {
84 .ai_family = (type & USOCK_IPV6ONLY) ? AF_INET6 :
85 (type & USOCK_IPV4ONLY) ? AF_INET : AF_UNSPEC,
86 .ai_socktype = socktype,
87 .ai_flags = AI_ADDRCONFIG
88 | ((type & USOCK_SERVER) ? AI_PASSIVE : 0)
89 | ((type & USOCK_NUMERIC) ? AI_NUMERICHOST : 0),
93 if (getaddrinfo(host, service, &hints, &result))
96 for (rp = result; rp != NULL; rp = rp->ai_next) {
97 sock = usock_connect(rp->ai_addr, rp->ai_addrlen, rp->ai_family, socktype, server);
102 freeaddrinfo(result);
106 const char *usock_port(int port)
108 static char buffer[sizeof("65535\0")];
110 if (port < 0 || port > 65535)
113 snprintf(buffer, sizeof(buffer), "%u", port);
118 int usock(int type, const char *host, const char *service) {
119 int socktype = ((type & 0xff) == USOCK_TCP) ? SOCK_STREAM : SOCK_DGRAM;
120 bool server = !!(type & USOCK_SERVER);
123 if (type & USOCK_UNIX)
124 sock = usock_unix(host, socktype, server);
126 sock = usock_inet(type, host, service, socktype, server);
131 usock_set_flags(sock, type);
135 int usock_wait_ready(int fd, int msecs) {
136 struct pollfd fds[1];
140 fds[0].events = POLLOUT;
142 res = poll(fds, 1, msecs);
145 } else if (res == 0) {
149 socklen_t optlen = sizeof(err);
151 res = getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &optlen);