119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
/*
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* usock - socket helper functions
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*
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* Copyright (C) 2010 Steven Barth <steven@midlink.org>
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* Copyright (C) 2011-2012 Felix Fietkau <nbd@openwrt.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <stdbool.h>
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#include "usock.h"
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static void usock_set_flags(int sock, unsigned int type)
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{
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if (!(type & USOCK_NOCLOEXEC))
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fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC);
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if (type & USOCK_NONBLOCK)
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fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_NONBLOCK);
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}
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static int usock_connect(struct sockaddr *sa, int sa_len, int family, int socktype, bool server)
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{
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int sock;
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sock = socket(family, socktype, 0);
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if (sock < 0)
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return -1;
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if (server) {
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const int one = 1;
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setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
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if (!bind(sock, sa, sa_len) &&
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(socktype != SOCK_STREAM || !listen(sock, SOMAXCONN)))
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return sock;
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} else {
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if (!connect(sock, sa, sa_len) || errno == EINPROGRESS)
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return sock;
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}
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close(sock);
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return -1;
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}
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static int usock_unix(const char *host, int socktype, bool server)
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{
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struct sockaddr_un sun = {.sun_family = AF_UNIX};
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if (strlen(host) >= sizeof(sun.sun_path)) {
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errno = EINVAL;
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return -1;
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}
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strcpy(sun.sun_path, host);
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return usock_connect((struct sockaddr*)&sun, sizeof(sun), AF_UNIX, socktype, server);
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}
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static int usock_inet(int type, const char *host, const char *service, int socktype, bool server)
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{
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struct addrinfo *result, *rp;
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struct addrinfo hints = {
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.ai_family = (type & USOCK_IPV6ONLY) ? AF_INET6 :
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(type & USOCK_IPV4ONLY) ? AF_INET : AF_UNSPEC,
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.ai_socktype = socktype,
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.ai_flags = AI_ADDRCONFIG
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| ((type & USOCK_SERVER) ? AI_PASSIVE : 0)
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| ((type & USOCK_NUMERIC) ? AI_NUMERICHOST : 0),
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};
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int sock = -1;
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if (getaddrinfo(host, service, &hints, &result))
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return -1;
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for (rp = result; rp != NULL; rp = rp->ai_next) {
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sock = usock_connect(rp->ai_addr, rp->ai_addrlen, rp->ai_family, socktype, server);
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if (sock >= 0)
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break;
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}
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freeaddrinfo(result);
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return sock;
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}
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int usock(int type, const char *host, const char *service) {
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int socktype = ((type & 0xff) == USOCK_TCP) ? SOCK_STREAM : SOCK_DGRAM;
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bool server = !!(type & USOCK_SERVER);
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int sock;
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if (type & USOCK_UNIX)
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sock = usock_unix(host, socktype, server);
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else
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sock = usock_inet(type, host, service, socktype, server);
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if (sock < 0)
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return -1;
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usock_set_flags(sock, type);
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return sock;
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}
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