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/*
* gethost.cc: The program to run to get a compilation host from the
* DMUCS server.
*
* Copyright (C) 2005, 2006 Victor T. Norman
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "dmucs.h"
#include "dmucs_resolve.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <fstream>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>
#include <string>
#include <sstream>
#include <errno.h>
#include <signal.h>
#include "COSMIC/HDR/sockets.h"
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
extern char **environ;
void usage(const char *prog);
bool debugMode = false;
void sigchld_handler(int stat)
{
int childstat;
wait(&childstat);
}
int
main(int argc, char *argv[])
{
/*
* o Open a client socket to the server ip/port.
* o Send my IP address in a host request.
* o Read an IP address in a response.
* o Assign the value DISTCC_HOSTS to the IP address in the env.
* o Use execve to run the command passed in, with its args, on the
* command line.
* o Wait for the command to finish.
* o Close the client socket.
*/
#if (! defined (__CYGWIN__) && ! defined(__FreeBSD__))
/* install a SIGCHLD handler */
sigset(SIGCHLD, sigchld_handler);
#endif
/*
* Process command-line arguments:
*
* -s <server>, --server <server>: the name of the server machine.
* -p <port>, --port <port>: the port number to listen on (default: 6714).
* -D, --debug: debug mode (default: off)
*/
std::ostringstream serverName;
serverName << "@" << SERVER_MACH_NAME;
int serverPortNum = SERVER_PORT_NUM;
const char *distingProp = "";
const char* env = getenv("DMUCS_SERVER");
if (env)
{
serverName.seekp(1); // remove everything after the first "@".
serverName << env << '\0';
}
int nextarg = 1;
for (; nextarg < argc; nextarg++) {
if (strequ("-s", argv[nextarg]) || strequ("--server", argv[nextarg])) {
if (++nextarg >= argc) {
usage(argv[0]);
return -1;
}
serverName.seekp(1); // remove everything after the first "@".
serverName << argv[nextarg] << '\0';
} else if (strequ("-p", argv[nextarg]) ||
strequ("--port", argv[nextarg])) {
if (++nextarg >= argc) {
usage(argv[0]);
return -1;
}
serverPortNum = atoi(argv[nextarg]);
} else if (strequ("-t", argv[nextarg]) ||
strequ("--type", argv[nextarg])) {
if (++nextarg >= argc) {
usage(argv[0]);
return -1;
}
distingProp = argv[nextarg];
} else if (strequ("-D", argv[nextarg]) ||
strequ("--debug", argv[nextarg])) {
debugMode = true;
} else {
/* We are looking at the command to run, supposedly. */
break;
}
}
std::ostringstream clientPortStr;
clientPortStr << "c" << serverPortNum;
DMUCS_DEBUG((stderr, "doing Sopen with %s, %s\n",
serverName.str().c_str(), clientPortStr.str().c_str()));
Socket *client_sock = Sopen((char *) serverName.str().c_str(),
(char *) clientPortStr.str().c_str());
char remCompHostName[256];
if (!client_sock) {
fprintf(stderr, "WARNING: Could not connect to %s: %s\n",
serverName.str().c_str(), strerror(errno));
sprintf(remCompHostName,"0.0.0.0");
} else {
char hostname[256];
if (gethostname(hostname, 256) < 0) {
fprintf(stderr, "Could not get my hostname\n");
Sclose(client_sock);
return -1;
}
struct hostent *he = gethostbyname(hostname);
if (he == NULL) {
fprintf(stderr, "Could not get my hostname\n");
Sclose(client_sock);
return -1;
}
struct in_addr in;
memcpy(&in.s_addr, he->h_addr_list[0], sizeof(in.s_addr));
struct sockaddr sck;
socklen_t s = sizeof(sck);
getsockname(client_sock->skt, &sck, &s);
std::ostringstream clientReqStr;
clientReqStr << "host " << inet_ntoa(in) << " " << distingProp;
DMUCS_DEBUG((stderr, "Writing -->%s<-- to the server\n",
clientReqStr.str().c_str()));
Sputs((char *) clientReqStr.str().c_str(), client_sock);
DMUCS_DEBUG((stderr, "Calling Sgets\n"));
if (Sgets(remCompHostName, 256, client_sock) == NULL) {
fprintf(stderr, "Got error from reading socket.\n");
Sclose(client_sock);
return -1;
}
DMUCS_DEBUG((stderr, "Got -->%s<-- from the server\n",
remCompHostName));
}
/* If we get 0.0.0.0 that means there are no hosts left in the database. */
std::string resolved_name;
if (strncmp(remCompHostName, "0.0.0.0", strlen("0.0.0.0")) == 0) {
resolved_name = "";
} else {
/*
* Convert the ip address to a hostname before putting it
* in the environment as the value of DISTCC_HOSTS, so that
* the output in the distccmon-text is nice.
*/
unsigned int cpuIpAddr = inet_addr(remCompHostName);
struct in_addr c;
c.s_addr = cpuIpAddr;
getHostName(resolved_name, c);
/*
* Add /100 to the end of the DISTCC_HOSTS value. This tells
* distcc that there are 10 cpus on the machine, which should be
* more than any machines already have. Without this value, distcc
* assumes there are most 4 cpus, and so will not put more than 4
* compilations on that host at once, but instead, put the
* compilations in BLOCKED state.
*
* NOTE: a better solution would be to read the hosts-info file
* in this program and put the actual number of cpus after the '/'.
* But, that is alot of work for this often-run program to do, so
* for efficiency's sake we'll just do it this way.
*
* NOTE: even with a high value of 100 for the number of cpus,
* we won't overload a machine with 100 compiles, because the
* host-server (the 'dmucs' program) only gives out the host based
* on the actual number of cpus on the host -- which it gets from
* the hosts-info file.
*/
resolved_name += "/100";
}
std::ostringstream tmp;
tmp << "DISTCC_HOSTS=" << resolved_name;
DMUCS_DEBUG((stderr, "tmp is -->%s<--\n", tmp.str().c_str()));
if (putenv((char *) tmp.str().c_str()) != 0) {
fprintf(stderr, "Error putting DISTCC_HOSTS in the environment\n");
Sclose(client_sock);
return -1;
}
#if 0
for (char **ep = environ; *ep ; ep++) {
printf("Env: %s\n", *ep);
}
#endif
int forkret = fork();
if (forkret == 0) {
/* child process */
if (execvp(argv[nextarg], &argv[nextarg]) < 0) {
fprintf(stderr, "execvp failed: err %s\n", strerror(errno));
return -1;
}
return 0;
} else if (forkret < 0) {
fprintf(stderr, "Failed to fork a process!\n");
return -1;
}
/* parent process -- just wait for the child */
int status = 0;
(void) wait(&status);
Sclose(client_sock);
return WEXITSTATUS(status);
}
void
usage(const char *prog)
{
fprintf(stderr, "Usage: %s [-s|--server <server>] [-p|--port <port>] "
"[-D|--debug] [-t|--type <typestr>] <command> [args] \n\n", prog);
}
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