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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 <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <stdbool.h>
#include "usock.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(struct sockaddr *sa, int sa_len, int family, int socktype, bool server)
{
int sock;
sock = socket(family, socktype, 0);
if (sock < 0)
return -1;
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(const char *host, int socktype, bool server)
{
struct sockaddr_un sun = {.sun_family = AF_UNIX};
if (strlen(host) >= sizeof(sun.sun_path)) {
errno = EINVAL;
return -1;
}
strcpy(sun.sun_path, host);
return usock_connect((struct sockaddr*)&sun, sizeof(sun), AF_UNIX, socktype, server);
}
static int usock_inet(int type, const char *host, const char *service, int socktype, bool 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),
};
int sock = -1;
if (getaddrinfo(host, service, &hints, &result))
return -1;
for (rp = result; rp != NULL; rp = rp->ai_next) {
sock = usock_connect(rp->ai_addr, rp->ai_addrlen, rp->ai_family, socktype, server);
if (sock >= 0)
break;
}
freeaddrinfo(result);
return sock;
}
int usock(int type, const char *host, const char *service) {
int socktype = ((type & 0xff) == USOCK_TCP) ? SOCK_STREAM : SOCK_DGRAM;
bool server = !!(type & USOCK_SERVER);
int sock;
if (type & USOCK_UNIX)
sock = usock_unix(host, socktype, server);
else
sock = usock_inet(type, host, service, socktype, server);
if (sock < 0)
return -1;
usock_set_flags(sock, type);
return sock;
}
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