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/* cvm/module_local.c - Local CVM server module loop
* Copyright (C) 2010 Bruce Guenter <bruce@untroubled.org>
*
* 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 <sys/types.h>
#include <grp.h>
#include <pwd.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <msg/msg.h>
#include <net/socket.h>
#include <unix/nonblock.h>
#include "module.h"
static const char* path;
static int sock;
static int conn;
static unsigned long timeout = 1000;
static int poll_timeout(int fd, int event, unsigned long* timeout_left)
{
struct timeval start;
struct timeval end;
iopoll_fd io;
int r;
io.fd = fd;
io.events = event;
gettimeofday(&start, 0);
r = iopoll_restart(&io, 1, *timeout_left);
gettimeofday(&end, 0);
*timeout_left -= (end.tv_usec - start.tv_usec) / 1000
+ (end.tv_sec - start.tv_sec) * 1000;
return r;
}
static int read_input(void)
{
unsigned rd;
unsigned long timeout_left;
if ((conn = socket_acceptu(sock)) == -1) return CVME_IO;
if (!nonblock_on(conn)) {
close(conn);
return CVME_IO;
}
for (cvm_module_inbuflen = 0, timeout_left = timeout;
cvm_module_inbuflen < BUFSIZE;
cvm_module_inbuflen += rd) {
switch (poll_timeout(conn, IOPOLL_READ, &timeout_left)) {
case 0:
case -1:
close(conn);
return CVME_IO;
}
if ((rd = read(conn, cvm_module_inbuffer+cvm_module_inbuflen,
BUFSIZE-cvm_module_inbuflen)) == 0)
break;
if (rd == (unsigned)-1) {
close(conn);
return CVME_IO;
}
}
return 0;
}
static void write_output(void)
{
unsigned wr;
unsigned written;
unsigned long timeout_left;
for (written = 0, timeout_left = timeout;
written < cvm_module_outbuflen;
written += wr) {
if (poll_timeout(conn, IOPOLL_WRITE, &timeout_left) != 1)
break;
if ((wr = write(conn, cvm_module_outbuffer+written,
cvm_module_outbuflen-written)) == 0)
break;
if (wr == (unsigned)-1) break;
}
close(conn);
}
static void exitfn()
{
unlink(path);
cvm_module_log_shutdown();
exit(0);
}
static int make_socket(void)
{
mode_t old_umask;
mode_t mode = 0777;
uid_t owner = -1;
gid_t group = -1;
const char* tmp;
char* end;
struct passwd* pw;
struct group* gr;
if ((tmp = getenv("CVM_SOCKET_MODE")) != 0)
mode = strtoul(tmp, 0, 8);
if ((tmp = getenv("CVM_SOCKET_OWNER")) != 0) {
owner = strtoul(tmp, &end, 10);
if (*end != 0) {
if ((pw = getpwnam(tmp)) == 0) {
error1sys("getpwnam failed");
return CVME_IO;
}
owner = pw->pw_uid;
group = pw->pw_gid;
}
}
if ((tmp = getenv("CVM_SOCKET_GROUP")) != 0) {
group = strtoul(tmp, &end, 10);
if (*end != 0) {
if ((gr = getgrnam(tmp)) == 0) {
error1sys("getgrnam failed");
return CVME_IO;
}
group = gr->gr_gid;
}
}
old_umask = umask((mode & 0777) ^ 0777);
if ((sock = socket_unixstr()) == -1)
error1sys("Could not create socket");
else if (!socket_bindu(sock, path))
error1sys("Could not bind socket");
else if (chmod(path, mode) == -1)
error1sys("Could not change socket permission");
else if (chown(path, owner, group) == -1)
error1sys("Could not change socket ownership");
else if (!socket_listen(sock, 1))
error1sys("Could not listen on socket");
else {
umask(old_umask);
return 0;
}
return CVME_IO;
}
extern void usage(void);
int local_main(const char* p)
{
int code;
const char* e;
path = p;
signal(SIGPIPE, SIG_IGN);
signal(SIGINT, exitfn);
signal(SIGTERM, exitfn);
if ((e = getenv("CVM_LOCAL_TIMEOUT")) == 0
|| (timeout = strtoul(e, (char**)&e, 10)) == 0
|| *e != 0)
timeout = DEFAULT_TIMEOUT;
if ((code = make_socket()) != 0) return code;
if ((code = cvm_module_init()) != 0) return code;
cvm_module_log_startup();
code = 0;
do {
if ((code = read_input()) != 0) continue;
code = cvm_module_handle_request();
cvm_module_fact_end(code & CVME_MASK);
cvm_module_log_request();
write_output();
} while ((code & CVME_FATAL) == 0);
cvm_module_stop();
return 0;
}
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