mirror of
git://git.gnupg.org/gnupg.git
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347 lines
8.1 KiB
C
347 lines
8.1 KiB
C
/* watchgnupg.c - Socket server for GnuPG logs
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* Copyright (C) 2003 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <time.h>
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#define PGM "watchgnupg"
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static int verbose;
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static int debug;
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static void
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die (const char *format, ...)
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{
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va_list arg_ptr;
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fflush (stdout);
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fprintf (stderr, "%s: ", PGM);
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va_start (arg_ptr, format);
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vfprintf (stderr, format, arg_ptr);
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va_end (arg_ptr);
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putc ('\n', stderr);
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exit (1);
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}
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/* static void */
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/* err (const char *format, ...) */
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/* { */
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/* va_list arg_ptr; */
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/* fflush (stdout); */
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/* fprintf (stderr, "%s: ", PGM); */
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/* va_start (arg_ptr, format); */
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/* vfprintf (stderr, format, arg_ptr); */
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/* va_end (arg_ptr); */
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/* putc ('\n', stderr); */
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/* } */
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static void *
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xmalloc (size_t n)
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{
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void *p = malloc (n);
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if (!p)
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die ("out of core");
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return p;
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}
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static void *
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xcalloc (size_t n, size_t m)
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{
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void *p = calloc (n, m);
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if (!p)
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die ("out of core");
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return p;
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}
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static void *
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xrealloc (void *old, size_t n)
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{
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void *p = realloc (old, n);
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if (!p)
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die ("out of core");
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return p;
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}
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struct client_s {
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struct client_s *next;
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int fd;
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size_t size; /* Allocated size of buffer. */
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size_t len; /* Current length of buffer. */
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unsigned char *buffer; /* Buffer to with data already read. */
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};
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typedef struct client_s *client_t;
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static void
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print_fd_and_time (int fd)
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{
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struct tm *tp;
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time_t atime = time (NULL);
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tp = localtime (&atime);
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printf ("%3d - %04d-%02d-%02d %02d:%02d:%02d ",
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fd,
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1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday,
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tp->tm_hour, tp->tm_min, tp->tm_sec );
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}
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/* Print LINE for the client identified by C. Calling this function
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witgh LINE set to NULL, will flush the internal buffer. */
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static void
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print_line (client_t c, const char *line)
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{
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const char *s;
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size_t n;
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if (!line)
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{
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if (c->buffer && c->len)
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{
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print_fd_and_time (c->fd);
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fwrite (c->buffer, c->len, 1, stdout);
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putc ('\n', stdout);
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c->len = 0;
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}
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return;
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}
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while ((s = strchr (line, '\n')))
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{
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print_fd_and_time (c->fd);
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if (c->buffer && c->len)
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{
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fwrite (c->buffer, c->len, 1, stdout);
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c->len = 0;
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}
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fwrite (line, s - line + 1, 1, stdout);
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line = s + 1;
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}
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n = strlen (line);
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if (n)
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{
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if (c->len + n >= c->size)
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{
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c->size += ((n + 255) & ~255);
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c->buffer = (c->buffer
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? xrealloc (c->buffer, c->size)
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: xmalloc (c->size));
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}
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memcpy (c->buffer + c->len, line, n);
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c->len += n;
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}
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}
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int
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main (int argc, char **argv)
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{
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int last_argc = -1;
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int force = 0;
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struct sockaddr_un srvr_addr;
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int addrlen;
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int server;
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client_t client_list = NULL;
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if (argc)
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{
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argc--; argv++;
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}
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while (argc && last_argc != argc )
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{
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last_argc = argc;
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if (!strcmp (*argv, "--help"))
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{
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puts (
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"usage: " PGM " [options] socketname\n"
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"\n"
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" Options are --verbose, --debug and --force");
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exit (0);
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}
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if (!strcmp (*argv, "--verbose"))
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{
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verbose = 1;
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argc--; argv++;
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}
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else if (!strcmp (*argv, "--debug"))
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{
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verbose = debug = 1;
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argc--; argv++;
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}
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else if (!strcmp (*argv, "--force"))
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{
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force = 1;
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argc--; argv++;
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}
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}
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if (argc != 1)
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{
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die ("usage: " PGM " socketname\n");
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}
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if (verbose)
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fprintf (stderr, "opening socket `%s'\n", *argv);
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setvbuf (stdout, NULL, _IOLBF, 0);
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server = socket (PF_LOCAL, SOCK_STREAM, 0);
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if (server == -1)
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die ("socket() failed: %s\n", strerror (errno));
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memset (&srvr_addr, 0, sizeof srvr_addr);
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srvr_addr.sun_family = AF_LOCAL;
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strncpy (srvr_addr.sun_path, *argv, sizeof (srvr_addr.sun_path) - 1);
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srvr_addr.sun_path[sizeof (srvr_addr.sun_path) - 1] = 0;
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addrlen = (offsetof (struct sockaddr_un, sun_path)
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+ strlen (srvr_addr.sun_path) + 1);
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again:
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if (bind (server, (struct sockaddr *) &srvr_addr, addrlen))
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{
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if (errno == EADDRINUSE && force)
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{
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force = 0;
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remove (srvr_addr.sun_path);
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goto again;
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}
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die ("bind to `%s' failed: %s\n", *argv, strerror (errno));
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}
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if (listen (server, 5))
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die ("listen failed: %s\n", strerror (errno));
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for (;;)
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{
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fd_set rfds;
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int max_fd;
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client_t client;
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/* Usually we don't have that many connections, thus it is okay
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to set them al the time from scratch and don't maintain an
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active fd_set. */
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FD_ZERO (&rfds);
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FD_SET (server, &rfds);
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max_fd = server;
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for (client = client_list; client; client = client->next)
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if (client->fd != -1)
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{
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FD_SET (client->fd, &rfds);
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if (client->fd > max_fd)
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max_fd = client->fd;
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}
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if (select (max_fd + 1, &rfds, NULL, NULL, NULL) <= 0)
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continue; /* Ignore any errors. */
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if (FD_ISSET (server, &rfds)) /* New connection. */
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{
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struct sockaddr_un clnt_addr;
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int fd;
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addrlen = sizeof clnt_addr;
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fd = accept (server, (struct sockaddr *) &clnt_addr, &addrlen);
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if (fd == -1)
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{
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printf ("accepting connection failed: %s\n", strerror (errno));
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}
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else if (fd >= FD_SETSIZE)
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{
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close (fd);
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printf ("[connection request denied: too many connections\n");
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}
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else
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{
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for (client = client_list; client && client->fd != -1;
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client = client->next)
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;
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if (!client)
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{
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client = xcalloc (1, sizeof *client);
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client->next = client_list;
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client_list = client;
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}
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client->fd = fd;
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printf ("[client at fd %d connected]\n", client->fd);
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}
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}
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for (client = client_list; client; client = client->next)
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if (client->fd != -1)
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{
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char line[256];
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int n;
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n = read (client->fd, line, sizeof line - 1);
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if (n == 1)
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{
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int save_errno = errno;
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print_line (client, NULL); /* flush */
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printf ("[client at fd %d read error: %s]\n",
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client->fd, strerror (save_errno));
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close (client->fd);
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client->fd = -1;
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}
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else if (!n)
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{
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print_line (client, NULL); /* flush */
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close (client->fd);
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printf ("[client at fd %d disconnected]\n", client->fd);
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client->fd = -1;
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}
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else
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{
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line[n] = 0;
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print_line (client, line);
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}
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}
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}
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return 0;
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}
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/*
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Local Variables:
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compile-command: "gcc -Wall -g -o watchgnupg watchgnupg.c"
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End:
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*/
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