thodg/libgit2/src/socket_stream.c

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• Hash : 9fe70c9e
  Author :
  Date : 2017-01-20T23:14:19
  

  Use SOCK_CLOEXEC when creating sockets

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• src/socket_stream.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include "socket_stream.h"
  
  #include "posix.h"
  #include "netops.h"
  #include "stream.h"
  
  #ifndef _WIN32
  #	include <sys/types.h>
  #	include <sys/socket.h>
  #	include <sys/select.h>
  #	include <sys/time.h>
  #	include <netdb.h>
  #	include <netinet/in.h>
  #       include <arpa/inet.h>
  #else
  #	include <winsock2.h>
  #	include <ws2tcpip.h>
  #	ifdef _MSC_VER
  #		pragma comment(lib, "ws2_32")
  #	endif
  #endif
  
  #ifdef GIT_WIN32
  static void net_set_error(const char *str)
  {
  	int error = WSAGetLastError();
  	char * win32_error = git_win32_get_error_message(error);
  
  	if (win32_error) {
  		giterr_set(GITERR_NET, "%s: %s", str, win32_error);
  		git__free(win32_error);
  	} else {
  		giterr_set(GITERR_NET, str);
  	}
  }
  #else
  static void net_set_error(const char *str)
  {
  	giterr_set(GITERR_NET, "%s: %s", str, strerror(errno));
  }
  #endif
  
  static int close_socket(GIT_SOCKET s)
  {
  	if (s == INVALID_SOCKET)
  		return 0;
  
  #ifdef GIT_WIN32
  	if (SOCKET_ERROR == closesocket(s))
  		return -1;
  
  	if (0 != WSACleanup()) {
  		giterr_set(GITERR_OS, "winsock cleanup failed");
  		return -1;
  	}
  
  	return 0;
  #else
  	return close(s);
  #endif
  
  }
  
  int socket_connect(git_stream *stream)
  {
  	struct addrinfo *info = NULL, *p;
  	struct addrinfo hints;
  	git_socket_stream *st = (git_socket_stream *) stream;
  	GIT_SOCKET s = INVALID_SOCKET;
  	int ret;
  
  #ifdef GIT_WIN32
  	/* on win32, the WSA context needs to be initialized
  	 * before any socket calls can be performed */
  	WSADATA wsd;
  
  	if (WSAStartup(MAKEWORD(2,2), &wsd) != 0) {
  		giterr_set(GITERR_OS, "winsock init failed");
  		return -1;
  	}
  
  	if (LOBYTE(wsd.wVersion) != 2 || HIBYTE(wsd.wVersion) != 2) {
  		WSACleanup();
  		giterr_set(GITERR_OS, "winsock init failed");
  		return -1;
  	}
  #endif
  
  	memset(&hints, 0x0, sizeof(struct addrinfo));
  	hints.ai_socktype = SOCK_STREAM;
  	hints.ai_family = AF_UNSPEC;
  
  	if ((ret = p_getaddrinfo(st->host, st->port, &hints, &info)) != 0) {
  		giterr_set(GITERR_NET,
  			   "failed to resolve address for %s: %s", st->host, p_gai_strerror(ret));
  		return -1;
  	}
  
  	for (p = info; p != NULL; p = p->ai_next) {
  		s = socket(p->ai_family, p->ai_socktype | SOCK_CLOEXEC, p->ai_protocol);
  
  		if (s == INVALID_SOCKET)
  			continue;
  
  		if (connect(s, p->ai_addr, (socklen_t)p->ai_addrlen) == 0)
  			break;
  
  		/* If we can't connect, try the next one */
  		close_socket(s);
  		s = INVALID_SOCKET;
  	}
  
  	/* Oops, we couldn't connect to any address */
  	if (s == INVALID_SOCKET && p == NULL) {
  		giterr_set(GITERR_OS, "failed to connect to %s", st->host);
  		p_freeaddrinfo(info);
  		return -1;
  	}
  
  	st->s = s;
  	p_freeaddrinfo(info);
  	return 0;
  }
  
  ssize_t socket_write(git_stream *stream, const char *data, size_t len, int flags)
  {
  	ssize_t ret;
  	size_t off = 0;
  	git_socket_stream *st = (git_socket_stream *) stream;
  
  	while (off < len) {
  		errno = 0;
  		ret = p_send(st->s, data + off, len - off, flags);
  		if (ret < 0) {
  			net_set_error("Error sending data");
  			return -1;
  		}
  
  		off += ret;
  	}
  
  	return off;
  }
  
  ssize_t socket_read(git_stream *stream, void *data, size_t len)
  {
  	ssize_t ret;
  	git_socket_stream *st = (git_socket_stream *) stream;
  
  	if ((ret = p_recv(st->s, data, len, 0)) < 0)
  		net_set_error("Error receiving socket data");
  
  	return ret;
  }
  
  int socket_close(git_stream *stream)
  {
  	git_socket_stream *st = (git_socket_stream *) stream;
  	int error;
  
  	error = close_socket(st->s);
  	st->s = INVALID_SOCKET;
  
  	return error;
  }
  
  void socket_free(git_stream *stream)
  {
  	git_socket_stream *st = (git_socket_stream *) stream;
  
  	git__free(st->host);
  	git__free(st->port);
  	git__free(st);
  }
  
  int git_socket_stream_new(git_stream **out, const char *host, const char *port)
  {
  	git_socket_stream *st;
  
  	assert(out && host);
  
  	st = git__calloc(1, sizeof(git_socket_stream));
  	GITERR_CHECK_ALLOC(st);
  
  	st->host = git__strdup(host);
  	GITERR_CHECK_ALLOC(st->host);
  
  	if (port) {
  		st->port = git__strdup(port);
  		GITERR_CHECK_ALLOC(st->port);
  	}
  
  	st->parent.version = GIT_STREAM_VERSION;
  	st->parent.connect = socket_connect;
  	st->parent.write = socket_write;
  	st->parent.read = socket_read;
  	st->parent.close = socket_close;
  	st->parent.free = socket_free;
  	st->s = INVALID_SOCKET;
  
  	*out = (git_stream *) st;
  	return 0;
  }
  

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