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/* -*- c-file-style: "java"; indent-tabs-mode: nil; tab-width: 4; fill-column: 78 -*-
*
* distcc -- A simple distributed compiler system
*
* Copyright (C) 2002, 2003, 2004 by Martin Pool
* Copyright 2007 Google Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
/* I just wish I could get caller-IQ on my phones...
-- The Purple People-Eater, NANAE */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <sys/poll.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include "types.h"
#include "distcc.h"
#include "trace.h"
#include "exitcode.h"
#include "clinet.h"
#include "util.h"
#include "netutil.h"
#ifndef h_errno
extern int h_errno;
#endif
const int dcc_connect_timeout = 4; /* seconds */
/*
* Client-side networking.
*
* These are called with an alarm set so we get a single timeout over the
* whole resolution and connection process.
*
* TODO: In error messages, show the name of the relevant host.
* Should do this even in readx(), etc.
*
* TODO: After connecting, perhaps try to read 0 bytes to see if there's an
* error.
*/
/*
* Connect to a host given its binary address, with a timeout.
*
* host and port are only here to aid printing debug messages.
*/
int dcc_connect_by_addr(struct sockaddr *sa, size_t salen,
int *p_fd)
{
int fd;
int ret;
char *s;
int failed;
int connecterr;
int tries = 3;
dcc_sockaddr_to_string(sa, salen, &s);
if (s == NULL) return EXIT_OUT_OF_MEMORY;
rs_trace("started connecting to %s", s);
if ((fd = socket(sa->sa_family, SOCK_STREAM, 0)) == -1) {
rs_log_error("failed to create socket: %s", strerror(errno));
ret = EXIT_CONNECT_FAILED;
goto out_failed;
}
dcc_set_nonblocking(fd);
/* start the nonblocking connect... */
do
failed = connect(fd, sa, salen);
while (failed == -1 &&
(errno == EINTR ||
(errno == EAGAIN && tries-- && poll(NULL, 0, 500) == 0)));
if (failed == -1 && errno != EINPROGRESS) {
rs_log(RS_LOG_ERR|RS_LOG_NONAME,
"failed to connect to %s: %s", s, strerror(errno));
ret = EXIT_CONNECT_FAILED;
goto out_failed;
}
do {
socklen_t len;
if ((ret = dcc_select_for_write(fd, dcc_connect_timeout))) {
rs_log(RS_LOG_ERR|RS_LOG_NONAME,
"timeout while connecting to %s", s);
goto out_failed;
}
connecterr = -1;
len = sizeof(connecterr);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (char *)&connecterr, &len) < 0) {
rs_log_error("getsockopt SO_ERROR failed?!");
ret = EXIT_CONNECT_FAILED;
goto out_failed;
}
/* looping is unlikely, but I believe I needed this in dkftpbench */
/* fixme: should reduce timeout on each time around this loop */
} while (connecterr == EINPROGRESS);
if (connecterr) {
rs_log(RS_LOG_ERR|RS_LOG_NONAME,
"nonblocking connect to %s failed: %s", s, strerror(connecterr));
ret = EXIT_CONNECT_FAILED;
goto out_failed;
}
*p_fd = fd;
free(s);
return 0;
out_failed:
free(s);
return ret;
}
#if defined(ENABLE_RFC2553)
/**
* Open a socket to a tcp remote host with the specified port.
**/
int dcc_connect_by_name(const char *host, int port, int *p_fd)
{
struct addrinfo hints;
struct addrinfo *res;
int error;
int ret;
char portname[20];
rs_trace("connecting to %s port %d", host, port);
/* Unfortunately for us, getaddrinfo wants the port (service) as a string */
snprintf(portname, sizeof portname, "%d", port);
memset(&hints, 0, sizeof(hints));
/* set-up hints structure */
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(host, portname, &hints, &res);
if (error) {
rs_log_error("failed to resolve host %s port %d: %s", host, port,
gai_strerror(error));
return EXIT_CONNECT_FAILED;
}
/* Try each of the hosts possible addresses. */
do {
ret = dcc_connect_by_addr(res->ai_addr, res->ai_addrlen, p_fd);
} while (ret != 0 && (res = res->ai_next));
return ret;
}
#else /* not ENABLE_RFC2553 */
/**
* Open a socket to a tcp remote host with the specified port.
*
* @todo Don't try for too long to connect.
**/
int dcc_connect_by_name(const char *host, int port, int *p_fd)
{
struct sockaddr_in sock_out;
struct hostent *hp;
/* FIXME: "warning: gethostbyname() leaks memory. Use gethostbyname_r
* instead!" (or indeed perhaps use getaddrinfo?) */
hp = gethostbyname(host);
if (!hp) {
rs_log_error("failed to look up host \"%s\": %s", host,
hstrerror(h_errno));
return EXIT_CONNECT_FAILED;
}
memcpy(&sock_out.sin_addr, hp->h_addr, (size_t) hp->h_length);
sock_out.sin_port = htons((in_port_t) port);
sock_out.sin_family = PF_INET;
return dcc_connect_by_addr((struct sockaddr *) &sock_out,
sizeof sock_out, p_fd);
}
#endif /* not ENABLE_RFC2553 */
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