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>
33 static void usock_set_flags(int sock
, unsigned int type
)
35 if (!(type
& USOCK_NOCLOEXEC
))
36 fcntl(sock
, F_SETFD
, fcntl(sock
, F_GETFD
) | FD_CLOEXEC
);
38 if (type
& USOCK_NONBLOCK
)
39 fcntl(sock
, F_SETFL
, fcntl(sock
, F_GETFL
) | O_NONBLOCK
);
42 static int usock_connect(struct sockaddr
*sa
, int sa_len
, int family
, int socktype
, bool server
)
46 sock
= socket(family
, socktype
, 0);
52 setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
, &one
, sizeof(one
));
54 if (!bind(sock
, sa
, sa_len
) &&
55 (socktype
!= SOCK_STREAM
|| !listen(sock
, SOMAXCONN
)))
58 if (!connect(sock
, sa
, sa_len
) || errno
== EINPROGRESS
)
66 static int usock_unix(const char *host
, int socktype
, bool server
)
68 struct sockaddr_un sun
= {.sun_family
= AF_UNIX
};
70 if (strlen(host
) >= sizeof(sun
.sun_path
)) {
74 strcpy(sun
.sun_path
, host
);
76 return usock_connect((struct sockaddr
*)&sun
, sizeof(sun
), AF_UNIX
, socktype
, server
);
79 static int usock_inet(int type
, const char *host
, const char *service
, int socktype
, bool server
)
81 struct addrinfo
*result
, *rp
;
82 struct addrinfo hints
= {
83 .ai_family
= (type
& USOCK_IPV6ONLY
) ? AF_INET6
:
84 (type
& USOCK_IPV4ONLY
) ? AF_INET
: AF_UNSPEC
,
85 .ai_socktype
= socktype
,
86 .ai_flags
= AI_ADDRCONFIG
87 | ((type
& USOCK_SERVER
) ? AI_PASSIVE
: 0)
88 | ((type
& USOCK_NUMERIC
) ? AI_NUMERICHOST
: 0),
92 if (getaddrinfo(host
, service
, &hints
, &result
))
95 for (rp
= result
; rp
!= NULL
; rp
= rp
->ai_next
) {
96 sock
= usock_connect(rp
->ai_addr
, rp
->ai_addrlen
, rp
->ai_family
, socktype
, server
);
101 freeaddrinfo(result
);
105 const char *usock_port(int port
)
107 static char buffer
[sizeof("65535\0")];
109 if (port
< 0 || port
> 65535)
112 snprintf(buffer
, sizeof(buffer
), "%u", port
);
117 int usock(int type
, const char *host
, const char *service
) {
118 int socktype
= ((type
& 0xff) == USOCK_TCP
) ? SOCK_STREAM
: SOCK_DGRAM
;
119 bool server
= !!(type
& USOCK_SERVER
);
122 if (type
& USOCK_UNIX
)
123 sock
= usock_unix(host
, socktype
, server
);
125 sock
= usock_inet(type
, host
, service
, socktype
, server
);
130 usock_set_flags(sock
, type
);