mirror of
https://gitlab.xiph.org/xiph/icecast-common.git
synced 2024-11-03 04:17:20 -05:00
693 lines
15 KiB
C
693 lines
15 KiB
C
/* sock.c
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* - General Socket Functions
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*
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* Copyright (c) 1999 the icecast team
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#ifndef _WIN32
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#include <unistd.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <sys/time.h>
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#include <netdb.h>
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#else
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#include <winsock2.h>
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#define vsnprintf _vsnprintf
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#define EINPROGRESS WSAEINPROGRESS
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#define ENOTSOCK WSAENOTSOCK
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#define EWOULDBLOCK WSAEWOULDBLOCK
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#define EALREADY WSAEALREADY
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#define socklen_t int
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#endif
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#include "sock.h"
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#include "resolver.h"
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/* sock_initialize
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**
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** initializes the socket library. you must call this
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** before using the library!
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*/
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void sock_initialize(void)
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{
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#ifdef _WIN32
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WSADATA wsad;
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WSAStartup(0x0101, &wsad);
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#endif
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resolver_initialize();
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}
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/* sock_shutdown
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**
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** shutdown the socket library. remember to call this when you're
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** through using the lib
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*/
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void sock_shutdown(void)
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{
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#ifdef _WIN32
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WSACleanup();
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#endif
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}
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/* sock_get_localip
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**
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** gets the local ip address for the machine
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** the ip it returns *should* be on the internet.
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** in any case, it's as close as we can hope to get
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** unless someone has better ideas on how to do this
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*/
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char *sock_get_localip(char *buff, int len)
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{
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char temp[1024];
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if (gethostname(temp, 1024) != 0)
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return NULL;
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if (resolver_getip(temp, buff, len))
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return buff;
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return NULL;
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}
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/* sock_error
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**
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** returns the last socket error
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*/
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int sock_error(void)
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{
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#ifdef _WIN32
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return WSAGetLastError();
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#else
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return errno;
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#endif
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}
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/* sock_recoverable
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**
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** determines if the socket error is recoverable
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** in terms of non blocking sockets
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*/
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int sock_recoverable(int error)
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{
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return (error == 0 || error == EAGAIN || error == EINTR ||
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error == EINPROGRESS || error == EWOULDBLOCK);
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}
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int sock_stalled (int error)
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{
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return error == EAGAIN || error == EINPROGRESS || error == EWOULDBLOCK ||
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error == EALREADY;
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}
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int sock_success (int error)
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{
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return error == 0;
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}
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int sock_connect_pending (int error)
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{
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return error == EINPROGRESS || error == EALREADY;
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}
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/* sock_valid_socket
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**
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** determines if a sock_t represents a valid socket
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*/
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int sock_valid_socket(sock_t sock)
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{
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int ret;
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int optval;
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socklen_t optlen;
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optlen = sizeof(int);
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ret = getsockopt(sock, SOL_SOCKET, SO_TYPE, &optval, &optlen);
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return (ret == 0);
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}
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/* inet_aton
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**
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** turns an ascii ip address into a binary representation
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*/
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#ifdef _WIN32
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int inet_aton(const char *s, struct in_addr *a)
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{
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int lsb, b2, b3, msb;
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if (sscanf(s, "%d.%d.%d.%d", &lsb, &b2, &b3, &msb) < 4) {
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return 0;
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}
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a->s_addr = inet_addr(s);
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return (a->s_addr != INADDR_NONE);
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}
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#endif /* _WIN32 */
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/* sock_set_blocking
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**
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** set the sock blocking or nonblocking
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** SOCK_BLOCK for blocking
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** SOCK_NONBLOCK for nonblocking
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*/
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int sock_set_blocking(sock_t sock, const int block)
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{
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#ifdef _WIN32
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int varblock = block;
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#endif
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if ((!sock_valid_socket(sock)) || (block < 0) || (block > 1))
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return SOCK_ERROR;
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#ifdef _WIN32
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return ioctlsocket(sock, FIONBIO, &varblock);
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#else
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return fcntl(sock, F_SETFL, (block == SOCK_BLOCK) ? 0 : O_NONBLOCK);
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#endif
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}
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int sock_set_nolinger(sock_t sock)
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{
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struct linger lin = { 0, 0 };
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return setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&lin,
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sizeof(struct linger));
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}
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int sock_set_nodelay(sock_t sock)
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{
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int nodelay = 1;
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return setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *)nodelay,
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sizeof(int));
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}
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int sock_set_keepalive(sock_t sock)
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{
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int keepalive = 1;
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return setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&keepalive,
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sizeof(int));
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}
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/* sock_close
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**
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** close the socket
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*/
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int sock_close(sock_t sock)
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{
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#ifdef _WIN32
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return closesocket(sock);
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#else
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return close(sock);
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#endif
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}
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/* sock_writev
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*
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* write multiple buffers at once, return bytes actually written
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*/
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#ifdef HAVE_WRITEV
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ssize_t sock_writev (int sock, const struct iovec *iov, const size_t count)
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{
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return writev (sock, iov, count);
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}
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#else
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ssize_t sock_writev (int sock, const struct iovec *iov, const size_t count)
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{
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int i = count, accum = 0, ret;
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const struct iovec *v = iov;
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while (i)
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{
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if (v->iov_base && v->iov_len)
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{
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ret = sock_write_bytes (sock, v->iov_base, v->iov_len);
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if (ret == -1 && accum==0)
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return -1;
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if (ret == -1)
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ret = 0;
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accum += ret;
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if (ret < (int)v->iov_len)
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break;
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}
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v++;
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i--;
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}
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return accum;
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}
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#endif
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/* sock_write_bytes
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**
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** write bytes to the socket
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** this function will _NOT_ block
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*/
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int sock_write_bytes(sock_t sock, const void *buff, const size_t len)
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{
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/* sanity check */
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if (!buff) {
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return SOCK_ERROR;
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} else if (len <= 0) {
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return SOCK_ERROR;
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} /*else if (!sock_valid_socket(sock)) {
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return SOCK_ERROR;
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} */
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return send(sock, buff, len, 0);
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}
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/* sock_write_string
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**
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** writes a string to a socket
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** this function always blocks even if the socket is nonblocking
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*/
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int sock_write_string(sock_t sock, const char *buff)
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{
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return (sock_write_bytes(sock, buff, strlen(buff)) > 0);
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}
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/* sock_write
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**
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** write a formatted string to the socket
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** this function will always block, even if the socket is nonblocking
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** will truncate the string if it's greater than 1024 chars.
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*/
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int sock_write(sock_t sock, const char *fmt, ...)
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{
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char buff[1024];
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va_list ap;
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va_start(ap, fmt);
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vsnprintf(buff, 1024, fmt, ap);
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va_end(ap);
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return sock_write_bytes(sock, buff, strlen(buff));
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}
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int sock_read_bytes(sock_t sock, char *buff, const int len)
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{
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/*if (!sock_valid_socket(sock)) return 0; */
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if (!buff) return 0;
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if (len <= 0) return 0;
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return recv(sock, buff, len, 0);
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}
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/* sock_read_line
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**
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** Read one line of at max len bytes from sock into buff.
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** If ok, return 1 and nullterminate buff. Otherwize return 0.
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** Terminating \n is not put into the buffer.
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**
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** this function will probably not work on sockets in nonblocking mode
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*/
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int sock_read_line(sock_t sock, char *buff, const int len)
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{
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char c = '\0';
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int read_bytes, pos;
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/*if (!sock_valid_socket(sock)) {
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return 0;
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} else*/ if (!buff) {
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return 0;
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} else if (len <= 0) {
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return 0;
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}
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pos = 0;
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read_bytes = recv(sock, &c, 1, 0);
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if (read_bytes < 0) {
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return 0;
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}
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while ((c != '\n') && (pos < len) && (read_bytes == 1)) {
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if (c != '\r')
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buff[pos++] = c;
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read_bytes = recv(sock, &c, 1, 0);
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}
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if (read_bytes == 1) {
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buff[pos] = '\0';
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return 1;
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} else {
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return 0;
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}
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}
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/* see if a connection can be written to
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** return -1 unable to check
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** return 0 for not yet
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** return 1 for ok
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*/
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int sock_connected (int sock, unsigned timeout)
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{
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fd_set wfds;
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int val = SOCK_ERROR;
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socklen_t size = sizeof val;
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struct timeval tv;
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tv.tv_sec = timeout;
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tv.tv_usec = 0;
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FD_ZERO(&wfds);
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FD_SET(sock, &wfds);
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switch (select(sock + 1, NULL, &wfds, NULL, &tv))
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{
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case 0: return SOCK_TIMEOUT;
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default: if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &val, &size) < 0)
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val = SOCK_ERROR;
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case -1: return val;
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}
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}
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#ifdef HAVE_GETADDRINFO
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int sock_connect_non_blocking (const char *hostname, const unsigned port)
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{
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int sock = SOCK_ERROR;
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struct addrinfo *ai, *head, hints;
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char service[8];
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memset (&hints, 0, sizeof (hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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snprintf (service, sizeof (service), "%u", port);
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if (getaddrinfo (hostname, service, &hints, &head))
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return SOCK_ERROR;
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ai = head;
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while (ai)
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{
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if ((sock = socket (ai->ai_family, ai->ai_socktype, ai->ai_protocol))
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> -1)
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{
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sock_set_blocking (sock, SOCK_NONBLOCK);
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if (connect(sock, ai->ai_addr, ai->ai_addrlen) < 0 &&
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!sock_connect_pending(sock_error()))
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{
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sock_close (sock);
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sock = SOCK_ERROR;
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}
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else
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break;
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}
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ai = ai->ai_next;
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}
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if (head) freeaddrinfo (head);
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return sock;
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}
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sock_t sock_connect_wto(const char *hostname, const int port, const int timeout)
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{
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int sock = SOCK_ERROR;
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struct addrinfo *ai, *head, hints;
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char service[8];
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memset (&hints, 0, sizeof (hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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snprintf (service, sizeof (service), "%u", port);
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if (getaddrinfo (hostname, service, &hints, &head))
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return SOCK_ERROR;
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ai = head;
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while (ai)
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{
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if ((sock = socket (ai->ai_family, ai->ai_socktype, ai->ai_protocol))
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> -1)
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{
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if (timeout)
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{
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sock_set_blocking (sock, SOCK_NONBLOCK);
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if (connect (sock, ai->ai_addr, ai->ai_addrlen) < 0)
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{
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int ret = sock_connected (sock, timeout);
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if (ret <= 0)
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{
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sock_close (sock);
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sock = SOCK_ERROR;
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}
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}
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sock_set_blocking(sock, SOCK_BLOCK);
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}
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else
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{
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if (connect (sock, ai->ai_addr, ai->ai_addrlen) < 0)
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{
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sock_close (sock);
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sock = SOCK_ERROR;
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}
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}
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}
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ai = ai->ai_next;
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}
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if (head) freeaddrinfo (head);
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return sock;
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}
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#else
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int sock_try_connection (int sock, const char *hostname, const unsigned port)
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{
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struct sockaddr_in sin, server;
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char ip[MAX_ADDR_LEN];
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if (!hostname || !hostname[0] || port == 0)
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return -1;
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memset(&sin, 0, sizeof(struct sockaddr_in));
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memset(&server, 0, sizeof(struct sockaddr_in));
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if (!resolver_getip(hostname, ip, MAX_ADDR_LEN))
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{
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sock_close (sock);
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return -1;
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}
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if (inet_aton(ip, (struct in_addr *)&sin.sin_addr) == 0)
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{
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sock_close(sock);
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return -1;
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}
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memcpy(&server.sin_addr, &sin.sin_addr, sizeof(struct sockaddr_in));
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server.sin_family = AF_INET;
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server.sin_port = htons(port);
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return connect(sock, (struct sockaddr *)&server, sizeof(server));
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}
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int sock_connect_non_blocking (const char *hostname, const unsigned port)
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{
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int sock;
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sock = socket(AF_INET, SOCK_STREAM, 0);
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if (sock == -1)
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return -1;
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sock_set_blocking (sock, SOCK_NONBLOCK);
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sock_try_connection (sock, hostname, port);
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return sock;
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}
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sock_t sock_connect_wto(const char *hostname, const int port, const int timeout)
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{
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int sock;
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sock = socket(AF_INET, SOCK_STREAM, 0);
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if (sock == -1)
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return -1;
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if (timeout)
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{
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sock_set_blocking (sock, SOCK_NONBLOCK);
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if (sock_try_connection (sock, hostname, port) < 0)
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{
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int ret = sock_connected (sock, timeout);
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if (ret <= 0)
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{
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sock_close (sock);
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return SOCK_ERROR;
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}
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}
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sock_set_blocking(sock, SOCK_BLOCK);
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}
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else
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{
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if (sock_try_connection (sock, hostname, port) < 0)
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{
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sock_close (sock);
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sock = SOCK_ERROR;
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}
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}
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return sock;
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}
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#endif
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/* sock_get_server_socket
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**
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** create a socket for incoming requests on a specified port and
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** interface. if interface is null, listen on all interfaces.
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** returns the socket, or SOCK_ERROR on failure
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*/
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sock_t sock_get_server_socket(const int port, char *sinterface)
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{
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#ifdef HAVE_IPV6
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struct sockaddr_storage sa;
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#else
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struct sockaddr_in sa;
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#endif
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int sa_family, sa_len, error, opt;
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sock_t sock;
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char ip[MAX_ADDR_LEN];
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if (port < 0)
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return SOCK_ERROR;
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/* defaults */
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memset(&sa, 0, sizeof(sa));
|
|
sa_family = AF_INET;
|
|
sa_len = sizeof(struct sockaddr_in);
|
|
|
|
/* set the interface to bind to if specified */
|
|
if (sinterface != NULL) {
|
|
if (!resolver_getip(sinterface, ip, sizeof (ip)))
|
|
return SOCK_ERROR;
|
|
|
|
#ifdef HAVE_IPV6
|
|
if (inet_pton(AF_INET, ip, &((struct sockaddr_in*)&sa)->sin_addr) > 0) {
|
|
((struct sockaddr_in*)&sa)->sin_family = AF_INET;
|
|
((struct sockaddr_in*)&sa)->sin_port = htons(port);
|
|
} else if (inet_pton(AF_INET6, ip,
|
|
&((struct sockaddr_in6*)&sa)->sin6_addr) > 0) {
|
|
sa_family = AF_INET6;
|
|
sa_len = sizeof (struct sockaddr_in6);
|
|
((struct sockaddr_in6*)&sa)->sin6_family = AF_INET6;
|
|
((struct sockaddr_in6*)&sa)->sin6_port = htons(port);
|
|
} else {
|
|
return SOCK_ERROR;
|
|
}
|
|
#else
|
|
if (!inet_aton(ip, &sa.sin_addr)) {
|
|
return SOCK_ERROR;
|
|
} else {
|
|
sa.sin_family = AF_INET;
|
|
sa.sin_port = htons(port);
|
|
}
|
|
#endif
|
|
} else {
|
|
((struct sockaddr_in*)&sa)->sin_addr.s_addr = INADDR_ANY;
|
|
((struct sockaddr_in*)&sa)->sin_family = AF_INET;
|
|
((struct sockaddr_in*)&sa)->sin_port = htons(port);
|
|
}
|
|
|
|
/* get a socket */
|
|
sock = socket(sa_family, SOCK_STREAM, 0);
|
|
if (sock == -1)
|
|
return SOCK_ERROR;
|
|
|
|
/* reuse it if we can */
|
|
opt = 1;
|
|
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const void *)&opt, sizeof(int));
|
|
|
|
/* bind socket to port */
|
|
error = bind(sock, (struct sockaddr *)&sa, sa_len);
|
|
if (error == -1)
|
|
return SOCK_ERROR;
|
|
|
|
return sock;
|
|
}
|
|
|
|
int sock_listen(sock_t serversock, int backlog)
|
|
{
|
|
if (!sock_valid_socket(serversock))
|
|
return 0;
|
|
|
|
if (backlog <= 0)
|
|
backlog = 10;
|
|
|
|
return (listen(serversock, backlog) == 0);
|
|
}
|
|
|
|
int sock_accept(sock_t serversock, char *ip, int len)
|
|
{
|
|
#ifdef HAVE_IPV6
|
|
struct sockaddr_storage sa;
|
|
#else
|
|
struct sockaddr_in sa;
|
|
#endif
|
|
int ret;
|
|
socklen_t slen;
|
|
|
|
if (!sock_valid_socket(serversock))
|
|
return SOCK_ERROR;
|
|
|
|
slen = sizeof(sa);
|
|
ret = accept(serversock, (struct sockaddr *)&sa, &slen);
|
|
|
|
if (ret >= 0 && ip != NULL) {
|
|
#ifdef HAVE_IPV6
|
|
if(((struct sockaddr_in *)&sa)->sin_family == AF_INET)
|
|
inet_ntop(AF_INET, &((struct sockaddr_in *)&sa)->sin_addr,
|
|
ip, len);
|
|
else if(((struct sockaddr_in6 *)&sa)->sin6_family == AF_INET6)
|
|
inet_ntop(AF_INET6, &((struct sockaddr_in6 *)&sa)->sin6_addr,
|
|
ip, len);
|
|
else {
|
|
strncpy(ip, "ERROR", len-1);
|
|
ip[len-1] = 0;
|
|
}
|
|
#else
|
|
/* inet_ntoa is not reentrant, we should protect this */
|
|
strncpy(ip, inet_ntoa(sa.sin_addr), len);
|
|
#endif
|
|
sock_set_nolinger(ret);
|
|
sock_set_keepalive(ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|