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// Copyright (c) 2010, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <arpa/inet.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <cstdio>
#include <cstring>
#include <string>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "processor/logging.h"
#include "processor/udp_network.h"
namespace google_breakpad {
using std::string;
using std::dec;
UDPNetwork::~UDPNetwork() {
if (socket_ != -1) {
close(socket_);
socket_ = -1;
}
}
bool UDPNetwork::Init(bool listen) {
struct addrinfo hints;
struct addrinfo *results;
memset(&hints, 0, sizeof(hints));
if (ip4only_)
hints.ai_family = AF_INET;
else
// don't care if it's IPv4 or IPv6
hints.ai_family = AF_UNSPEC;
// want a UDP socket
hints.ai_socktype = SOCK_DGRAM;
if (listen)
hints.ai_flags = AI_PASSIVE;
const char *hostname = NULL;
if (!server_.empty())
hostname = server_.c_str();
char portname[6];
sprintf(portname, "%u", port_);
if (!listen) {
BPLOG(INFO) << "Initializing network connection to " << server_
<< ":" << dec << port_;
}
if (getaddrinfo(hostname, portname, &hints, &results) != 0) {
BPLOG(ERROR) << "failed to get address info for address " << server_
<< ": " << strerror(errno);
return false;
}
// save the address of the first result.
//TODO(ted): could support multiple DNS entries, round-robin them for
// fail-over etc
memcpy(&address_, results->ai_addr, GET_SA_LEN(results->ai_addr));
socket_ = socket(results->ai_family, results->ai_socktype,
results->ai_protocol);
freeaddrinfo(results);
if (socket_ == -1) {
BPLOG(ERROR) << "failed to create socket: " << strerror(errno);
return false;
}
if (listen) {
char address_string[INET_ADDRSTRLEN];
void *addr = NULL;
if (((struct sockaddr*)&address_)->sa_family == AF_INET)
addr = &((struct sockaddr_in*)&address_)->sin_addr;
else if (((struct sockaddr*)&address_)->sa_family == AF_INET6)
addr = &((struct sockaddr_in6*)&address_)->sin6_addr;
if (inet_ntop(((struct sockaddr*)&address_)->sa_family, addr,
address_string, sizeof(address_string)) != NULL)
BPLOG(INFO) << "Listening on address " << address_string;
if (bind(socket_,
(struct sockaddr *)&address_,
GET_SA_LEN(address_)) == -1) {
BPLOG(ERROR) << "Failed to bind socket";
close(socket_);
return false;
}
socklen_t bound_addr_len = GET_SA_LEN(address_);
if (getsockname(socket_, (struct sockaddr *)&address_, &bound_addr_len)
== 0) {
if (((struct sockaddr*)&address_)->sa_family == AF_INET)
port_ = ntohs(((struct sockaddr_in*)&address_)->sin_port);
else if (((struct sockaddr*)&address_)->sa_family == AF_INET6)
port_ = ntohs(((struct sockaddr_in6*)&address_)->sin6_port);
}
BPLOG(INFO) << "Listening on port " << port_;
}
return true;
}
bool UDPNetwork::Send(const char *data, size_t length) {
int total_sent = 0;
while (total_sent < length) {
int bytes_sent = sendto(socket_,
data + total_sent,
length - total_sent,
0,
(struct sockaddr *)&address_,
GET_SA_LEN(address_));
if (bytes_sent < 0) {
BPLOG(ERROR) << "error sending message: "
<< strerror(errno) << " (" << errno << ")";
break;
}
total_sent += bytes_sent;
}
return total_sent == length;
}
bool UDPNetwork::WaitToReceive(int wait_time) {
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(socket_, &readfds);
struct timeval timeout;
timeout.tv_sec = wait_time / 1000;
timeout.tv_usec = (wait_time % 1000) * 1000;
int ret = select(socket_+1, &readfds, NULL, NULL, &timeout);
if (ret == 0) {
return false;
} else if (ret == -1) {
if (errno != EINTR)
BPLOG(ERROR) << "error in select(): " << strerror(errno);
return false;
} else if (!FD_ISSET(socket_, &readfds)) {
BPLOG(ERROR) << "select returned, but our socket isn't ready?";
return false;
}
return true;
}
bool UDPNetwork::Receive(char *buffer, size_t buffer_size, ssize_t &received) {
socklen_t fromlen = GET_SA_LEN(address_);
received = recvfrom(socket_, buffer, buffer_size, 0,
(struct sockaddr *)&address_,
&fromlen);
if (received == -1) {
BPLOG(ERROR) << "Error in recvfrom reading response: "
<< strerror(errno);
}
return received != -1;
}
} // namespace google_breakpad
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