blob: 27b93ba94244d427cc6dd1971198f2e469d7618e [file] [log] [blame]
/*
* socket.c
*
* Copyright (C) 2012 Martin Szulecki <m.szulecki@libimobiledevice.org>
* Copyright (C) 2012 Nikias Bassen <nikias@gmx.li>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/stat.h>
#ifdef WIN32
#include <winsock2.h>
#include <windows.h>
static int wsa_init = 0;
#else
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#endif
#include "socket.h"
#define RECV_TIMEOUT 20000
static int verbose = 0;
void socket_set_verbose(int level)
{
verbose = level;
}
#ifndef WIN32
int socket_create_unix(const char *filename)
{
struct sockaddr_un name;
int sock;
size_t size;
#ifdef SO_NOSIGPIPE
int yes = 1;
#endif
// remove if still present
unlink(filename);
/* Create the socket. */
sock = socket(PF_LOCAL, SOCK_STREAM, 0);
if (sock < 0) {
perror("socket");
return -1;
}
#ifdef SO_NOSIGPIPE
if (setsockopt(sock, SOL_SOCKET, SO_NOSIGPIPE, (void*)&yes, sizeof(int)) == -1) {
perror("setsockopt()");
socket_close(sock);
return -1;
}
#endif
/* Bind a name to the socket. */
name.sun_family = AF_LOCAL;
strncpy(name.sun_path, filename, sizeof(name.sun_path));
name.sun_path[sizeof(name.sun_path) - 1] = '\0';
/* The size of the address is
the offset of the start of the filename,
plus its length,
plus one for the terminating null byte.
Alternatively you can just do:
size = SUN_LEN (&name);
*/
size = (offsetof(struct sockaddr_un, sun_path)
+ strlen(name.sun_path) + 1);
if (bind(sock, (struct sockaddr *) &name, size) < 0) {
perror("bind");
socket_close(sock);
return -1;
}
if (listen(sock, 10) < 0) {
perror("listen");
socket_close(sock);
return -1;
}
return sock;
}
int socket_connect_unix(const char *filename)
{
struct sockaddr_un name;
int sfd = -1;
size_t size;
struct stat fst;
#ifdef SO_NOSIGPIPE
int yes = 1;
#endif
// check if socket file exists...
if (stat(filename, &fst) != 0) {
if (verbose >= 2)
fprintf(stderr, "%s: stat '%s': %s\n", __func__, filename,
strerror(errno));
return -1;
}
// ... and if it is a unix domain socket
if (!S_ISSOCK(fst.st_mode)) {
if (verbose >= 2)
fprintf(stderr, "%s: File '%s' is not a socket!\n", __func__,
filename);
return -1;
}
// make a new socket
if ((sfd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
if (verbose >= 2)
fprintf(stderr, "%s: socket: %s\n", __func__, strerror(errno));
return -1;
}
#ifdef SO_NOSIGPIPE
if (setsockopt(sfd, SOL_SOCKET, SO_NOSIGPIPE, (void*)&yes, sizeof(int)) == -1) {
perror("setsockopt()");
socket_close(sfd);
return -1;
}
#endif
// and connect to 'filename'
name.sun_family = AF_LOCAL;
strncpy(name.sun_path, filename, sizeof(name.sun_path));
name.sun_path[sizeof(name.sun_path) - 1] = 0;
size = (offsetof(struct sockaddr_un, sun_path)
+ strlen(name.sun_path) + 1);
if (connect(sfd, (struct sockaddr *) &name, size) < 0) {
socket_close(sfd);
if (verbose >= 2)
fprintf(stderr, "%s: connect: %s\n", __func__,
strerror(errno));
return -1;
}
return sfd;
}
#endif
int socket_create(uint16_t port)
{
int sfd = -1;
int yes = 1;
#ifdef WIN32
WSADATA wsa_data;
if (!wsa_init) {
if (WSAStartup(MAKEWORD(2,2), &wsa_data) != ERROR_SUCCESS) {
fprintf(stderr, "WSAStartup failed!\n");
ExitProcess(-1);
}
wsa_init = 1;
}
#endif
struct sockaddr_in saddr;
if (0 > (sfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP))) {
perror("socket()");
return -1;
}
if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(int)) == -1) {
perror("setsockopt()");
socket_close(sfd);
return -1;
}
#ifdef SO_NOSIGPIPE
if (setsockopt(sfd, SOL_SOCKET, SO_NOSIGPIPE, (void*)&yes, sizeof(int)) == -1) {
perror("setsockopt()");
socket_close(sfd);
return -1;
}
#endif
memset((void *) &saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_addr.s_addr = htonl(INADDR_ANY);
saddr.sin_port = htons(port);
if (0 > bind(sfd, (struct sockaddr *) &saddr, sizeof(saddr))) {
perror("bind()");
socket_close(sfd);
return -1;
}
if (listen(sfd, 1) == -1) {
perror("listen()");
socket_close(sfd);
return -1;
}
return sfd;
}
int socket_connect(const char *addr, uint16_t port)
{
int sfd = -1;
int yes = 1;
struct hostent *hp;
struct sockaddr_in saddr;
#ifdef WIN32
WSADATA wsa_data;
if (!wsa_init) {
if (WSAStartup(MAKEWORD(2,2), &wsa_data) != ERROR_SUCCESS) {
fprintf(stderr, "WSAStartup failed!\n");
ExitProcess(-1);
}
wsa_init = 1;
}
#endif
if (!addr) {
errno = EINVAL;
return -1;
}
if ((hp = gethostbyname(addr)) == NULL) {
if (verbose >= 2)
fprintf(stderr, "%s: unknown host '%s'\n", __func__, addr);
return -1;
}
if (!hp->h_addr) {
if (verbose >= 2)
fprintf(stderr, "%s: gethostbyname returned NULL address!\n",
__func__);
return -1;
}
if (0 > (sfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP))) {
perror("socket()");
return -1;
}
if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (void*)&yes, sizeof(int)) == -1) {
perror("setsockopt()");
socket_close(sfd);
return -1;
}
#ifdef SO_NOSIGPIPE
if (setsockopt(sfd, SOL_SOCKET, SO_NOSIGPIPE, (void*)&yes, sizeof(int)) == -1) {
perror("setsockopt()");
socket_close(sfd);
return -1;
}
#endif
memset((void *) &saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_addr.s_addr = *(uint32_t *) hp->h_addr;
saddr.sin_port = htons(port);
if (connect(sfd, (struct sockaddr *) &saddr, sizeof(saddr)) < 0) {
perror("connect");
socket_close(sfd);
return -2;
}
return sfd;
}
int socket_check_fd(int fd, fd_mode fdm, unsigned int timeout)
{
fd_set fds;
int sret;
int eagain;
struct timeval to;
struct timeval *pto;
if (fd < 0) {
if (verbose >= 2)
fprintf(stderr, "ERROR: invalid fd in check_fd %d\n", fd);
return -1;
}
FD_ZERO(&fds);
FD_SET(fd, &fds);
if (timeout > 0) {
to.tv_sec = (time_t) (timeout / 1000);
to.tv_usec = (time_t) ((timeout - (to.tv_sec * 1000)) * 1000);
pto = &to;
} else {
pto = NULL;
}
sret = -1;
do {
eagain = 0;
switch (fdm) {
case FDM_READ:
sret = select(fd + 1, &fds, NULL, NULL, pto);
break;
case FDM_WRITE:
sret = select(fd + 1, NULL, &fds, NULL, pto);
break;
case FDM_EXCEPT:
sret = select(fd + 1, NULL, NULL, &fds, pto);
break;
default:
return -1;
}
if (sret < 0) {
switch (errno) {
case EINTR:
// interrupt signal in select
if (verbose >= 2)
fprintf(stderr, "%s: EINTR\n", __func__);
eagain = 1;
break;
case EAGAIN:
if (verbose >= 2)
fprintf(stderr, "%s: EAGAIN\n", __func__);
break;
default:
if (verbose >= 2)
fprintf(stderr, "%s: select failed: %s\n", __func__,
strerror(errno));
return -1;
}
}
} while (eagain);
return sret;
}
int socket_accept(int fd, uint16_t port)
{
#ifdef WIN32
int addr_len;
#else
socklen_t addr_len;
#endif
int result;
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(port);
addr_len = sizeof(addr);
result = accept(fd, (struct sockaddr*)&addr, &addr_len);
return result;
}
int socket_shutdown(int fd, int how)
{
return shutdown(fd, how);
}
int socket_close(int fd) {
#ifdef WIN32
return closesocket(fd);
#else
return close(fd);
#endif
}
int socket_receive(int fd, void *data, size_t length)
{
return socket_receive_timeout(fd, data, length, 0, RECV_TIMEOUT);
}
int socket_peek(int fd, void *data, size_t length)
{
return socket_receive_timeout(fd, data, length, MSG_PEEK, RECV_TIMEOUT);
}
int socket_receive_timeout(int fd, void *data, size_t length, int flags,
unsigned int timeout)
{
int res;
int result;
// check if data is available
res = socket_check_fd(fd, FDM_READ, timeout);
if (res <= 0) {
return res;
}
// if we get here, there _is_ data available
result = recv(fd, data, length, flags);
if (res > 0 && result == 0) {
// but this is an error condition
if (verbose >= 3)
fprintf(stderr, "%s: fd=%d recv returned 0\n", __func__, fd);
return -EAGAIN;
}
if (result < 0) {
return -errno;
}
return result;
}
int socket_send(int fd, void *data, size_t length)
{
int flags = 0;
#ifdef MSG_NOSIGNAL
flags |= MSG_NOSIGNAL;
#endif
return send(fd, data, length, flags);
}