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-rw-r--r--tools/watchgnupg.c519
1 files changed, 519 insertions, 0 deletions
diff --git a/tools/watchgnupg.c b/tools/watchgnupg.c
new file mode 100644
index 0000000..fc58d14
--- /dev/null
+++ b/tools/watchgnupg.c
@@ -0,0 +1,519 @@
+/* watchgnupg.c - Socket server for GnuPG logs
+ * Copyright (C) 2003, 2004, 2010 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <assert.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <time.h>
+#ifdef HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif
+
+#define PGM "watchgnupg"
+
+/* Allow for a standalone build on most systems. */
+#ifdef VERSION
+#define MYVERSION_LINE PGM " ("GNUPG_NAME") " VERSION
+#define BUGREPORT_LINE "\nReport bugs to <bug-gnupg@gnu.org>.\n"
+#else
+#define MYVERSION_LINE PGM " (standalone build) " __DATE__
+#define BUGREPORT_LINE ""
+#endif
+#if !defined(SUN_LEN) || !defined(PF_LOCAL) || !defined(AF_LOCAL)
+#define GNUPG_COMMON_NEED_AFLOCAL
+#include "../common/mischelp.h"
+#endif
+
+
+static int verbose;
+static int time_only;
+
+static void
+die (const char *format, ...)
+{
+ va_list arg_ptr;
+
+ fflush (stdout);
+ fprintf (stderr, "%s: ", PGM);
+
+ va_start (arg_ptr, format);
+ vfprintf (stderr, format, arg_ptr);
+ va_end (arg_ptr);
+ putc ('\n', stderr);
+
+ exit (1);
+}
+
+
+static void
+err (const char *format, ...)
+{
+ va_list arg_ptr;
+
+ fflush (stdout);
+ fprintf (stderr, "%s: ", PGM);
+
+ va_start (arg_ptr, format);
+ vfprintf (stderr, format, arg_ptr);
+ va_end (arg_ptr);
+ putc ('\n', stderr);
+}
+
+static void *
+xmalloc (size_t n)
+{
+ void *p = malloc (n);
+ if (!p)
+ die ("out of core");
+ return p;
+}
+
+static void *
+xcalloc (size_t n, size_t m)
+{
+ void *p = calloc (n, m);
+ if (!p)
+ die ("out of core");
+ return p;
+}
+
+static void *
+xrealloc (void *old, size_t n)
+{
+ void *p = realloc (old, n);
+ if (!p)
+ die ("out of core");
+ return p;
+}
+
+
+struct client_s {
+ struct client_s *next;
+ int fd;
+ size_t size; /* Allocated size of buffer. */
+ size_t len; /* Current length of buffer. */
+ unsigned char *buffer; /* Buffer to with data already read. */
+
+};
+typedef struct client_s *client_t;
+
+/* The list of all connected peers. */
+static client_t client_list;
+
+
+
+
+static void
+print_fd_and_time (int fd)
+{
+ struct tm *tp;
+ time_t atime = time (NULL);
+
+ tp = localtime (&atime);
+ if (time_only)
+ printf ("%3d - %02d:%02d:%02d ",
+ fd,
+ tp->tm_hour, tp->tm_min, tp->tm_sec );
+ else
+ printf ("%3d - %04d-%02d-%02d %02d:%02d:%02d ",
+ fd,
+ 1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday,
+ tp->tm_hour, tp->tm_min, tp->tm_sec );
+}
+
+
+/* Print LINE for the client identified by C. Calling this function
+ with LINE set to NULL, will flush the internal buffer. */
+static void
+print_line (client_t c, const char *line)
+{
+ const char *s;
+ size_t n;
+
+ if (!line)
+ {
+ if (c->buffer && c->len)
+ {
+ print_fd_and_time (c->fd);
+ fwrite (c->buffer, c->len, 1, stdout);
+ putc ('\n', stdout);
+ c->len = 0;
+ }
+ return;
+ }
+
+ while ((s = strchr (line, '\n')))
+ {
+ print_fd_and_time (c->fd);
+ if (c->buffer && c->len)
+ {
+ fwrite (c->buffer, c->len, 1, stdout);
+ c->len = 0;
+ }
+ fwrite (line, s - line + 1, 1, stdout);
+ line = s + 1;
+ }
+ n = strlen (line);
+ if (n)
+ {
+ if (c->len + n >= c->size)
+ {
+ c->size += ((n + 255) & ~255);
+ c->buffer = (c->buffer
+ ? xrealloc (c->buffer, c->size)
+ : xmalloc (c->size));
+ }
+ memcpy (c->buffer + c->len, line, n);
+ c->len += n;
+ }
+}
+
+
+static void
+setup_client (int server_fd, int is_un)
+{
+ struct sockaddr_un addr_un;
+ struct sockaddr_in addr_in;
+ struct sockaddr *addr;
+ socklen_t addrlen;
+ int fd;
+ client_t client;
+
+ if (is_un)
+ {
+ addr = (struct sockaddr *)&addr_un;
+ addrlen = sizeof addr_un;
+ }
+ else
+ {
+ addr = (struct sockaddr *)&addr_in;
+ addrlen = sizeof addr_in;
+ }
+
+ fd = accept (server_fd, addr, &addrlen);
+ if (fd == -1)
+ {
+ printf ("[accepting %s connection failed: %s]\n",
+ is_un? "local":"tcp", strerror (errno));
+ }
+ else if (fd >= FD_SETSIZE)
+ {
+ close (fd);
+ printf ("[connection request denied: too many connections]\n");
+ }
+ else
+ {
+ for (client = client_list; client && client->fd != -1;
+ client = client->next)
+ ;
+ if (!client)
+ {
+ client = xcalloc (1, sizeof *client);
+ client->next = client_list;
+ client_list = client;
+ }
+ client->fd = fd;
+ printf ("[client at fd %d connected (%s)]\n",
+ client->fd, is_un? "local":"tcp");
+ }
+}
+
+
+
+static void
+print_version (int with_help)
+{
+ fputs (MYVERSION_LINE "\n"
+ "Copyright (C) 2017 Free Software Foundation, Inc.\n"
+ "License GPLv3+: "
+ "GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>\n"
+ "This is free software: you are free to change and redistribute it.\n"
+ "There is NO WARRANTY, to the extent permitted by law.\n",
+ stdout);
+ if (with_help)
+ fputs
+ ("\n"
+ "Usage: " PGM " [OPTIONS] SOCKETNAME\n"
+ " " PGM " [OPTIONS] PORT [SOCKETNAME]\n"
+ "Open the local socket SOCKETNAME (or the TCP port PORT)\n"
+ "and display log messages\n"
+ "\n"
+ " --tcp listen on a TCP port and optionally on a local socket\n"
+ " --force delete an already existing socket file\n"
+ " --verbose enable extra informational output\n"
+ " --time-only print only the time; not a full timestamp\n"
+ " --version print version of the program and exit\n"
+ " --help display this help and exit\n"
+ BUGREPORT_LINE, stdout );
+
+ exit (0);
+}
+
+int
+main (int argc, char **argv)
+{
+ int last_argc = -1;
+ int force = 0;
+ int tcp = 0;
+
+ struct sockaddr_un srvr_addr_un;
+ struct sockaddr_in srvr_addr_in;
+ struct sockaddr *addr_in = NULL;
+ struct sockaddr *addr_un = NULL;
+ socklen_t addrlen_in, addrlen_un;
+ unsigned short port;
+ int server_un, server_in;
+ int flags;
+
+ if (argc)
+ {
+ argc--; argv++;
+ }
+ while (argc && last_argc != argc )
+ {
+ last_argc = argc;
+ if (!strcmp (*argv, "--"))
+ {
+ argc--; argv++;
+ break;
+ }
+ else if (!strcmp (*argv, "--version"))
+ print_version (0);
+ else if (!strcmp (*argv, "--help"))
+ print_version (1);
+ else if (!strcmp (*argv, "--verbose"))
+ {
+ verbose = 1;
+ argc--; argv++;
+ }
+ else if (!strcmp (*argv, "--time-only"))
+ {
+ time_only = 1;
+ argc--; argv++;
+ }
+ else if (!strcmp (*argv, "--force"))
+ {
+ force = 1;
+ argc--; argv++;
+ }
+ else if (!strcmp (*argv, "--tcp"))
+ {
+ tcp = 1;
+ argc--; argv++;
+ }
+ }
+
+ if (!((!tcp && argc == 1) || (tcp && (argc == 1 || argc == 2))))
+ {
+ fprintf (stderr, "usage: " PGM " socketname\n"
+ " " PGM " --tcp port [socketname]\n");
+ exit (1);
+ }
+
+ if (tcp)
+ {
+ port = atoi (*argv);
+ argc--; argv++;
+ }
+ else
+ {
+ port = 0;
+ }
+
+ setvbuf (stdout, NULL, _IOLBF, 0);
+
+ if (tcp)
+ {
+ int i = 1;
+ server_in = socket (PF_INET, SOCK_STREAM, 0);
+ if (server_in == -1)
+ die ("socket(PF_INET) failed: %s\n", strerror (errno));
+ if (setsockopt (server_in, SOL_SOCKET, SO_REUSEADDR,
+ (unsigned char *)&i, sizeof (i)))
+ err ("setsockopt(SO_REUSEADDR) failed: %s\n", strerror (errno));
+ if (verbose)
+ fprintf (stderr, "listening on port %hu\n", port);
+ }
+ else
+ server_in = -1;
+
+ if (argc)
+ {
+ server_un = socket (PF_LOCAL, SOCK_STREAM, 0);
+ if (server_un == -1)
+ die ("socket(PF_LOCAL) failed: %s\n", strerror (errno));
+ if (verbose)
+ fprintf (stderr, "listening on socket '%s'\n", *argv);
+ }
+ else
+ server_un = -1;
+
+ /* We better set the listening socket to non-blocking so that we
+ don't get bitten by race conditions in accept. The should not
+ happen for Unix Domain sockets but well, shit happens. */
+ if (server_in != -1)
+ {
+ flags = fcntl (server_in, F_GETFL, 0);
+ if (flags == -1)
+ die ("fcntl (F_GETFL) failed: %s\n", strerror (errno));
+ if ( fcntl (server_in, F_SETFL, (flags | O_NONBLOCK)) == -1)
+ die ("fcntl (F_SETFL) failed: %s\n", strerror (errno));
+ }
+ if (server_un != -1)
+ {
+ flags = fcntl (server_un, F_GETFL, 0);
+ if (flags == -1)
+ die ("fcntl (F_GETFL) failed: %s\n", strerror (errno));
+ if ( fcntl (server_un, F_SETFL, (flags | O_NONBLOCK)) == -1)
+ die ("fcntl (F_SETFL) failed: %s\n", strerror (errno));
+ }
+
+ if (tcp)
+ {
+ memset (&srvr_addr_in, 0, sizeof srvr_addr_in);
+ srvr_addr_in.sin_family = AF_INET;
+ srvr_addr_in.sin_port = htons (port);
+ srvr_addr_in.sin_addr.s_addr = htonl (INADDR_ANY);
+ addr_in = (struct sockaddr *)&srvr_addr_in;
+ addrlen_in = sizeof srvr_addr_in;
+ }
+ if (argc)
+ {
+ memset (&srvr_addr_un, 0, sizeof srvr_addr_un);
+ srvr_addr_un.sun_family = AF_LOCAL;
+ strncpy (srvr_addr_un.sun_path, *argv, sizeof (srvr_addr_un.sun_path)-1);
+ srvr_addr_un.sun_path[sizeof (srvr_addr_un.sun_path) - 1] = 0;
+ addr_un = (struct sockaddr *)&srvr_addr_un;
+ addrlen_un = SUN_LEN (&srvr_addr_un);
+ }
+ else
+ addrlen_un = 0; /* Silent gcc. */
+
+ if (server_in != -1 && bind (server_in, addr_in, addrlen_in))
+ die ("bind to port %hu failed: %s\n", port, strerror (errno));
+
+ again:
+ if (server_un != -1 && bind (server_un, addr_un, addrlen_un))
+ {
+ if (errno == EADDRINUSE && force)
+ {
+ force = 0;
+ remove (srvr_addr_un.sun_path);
+ goto again;
+ }
+ else
+ die ("bind to '%s' failed: %s\n", *argv, strerror (errno));
+ }
+
+ if (server_in != -1 && listen (server_in, 5))
+ die ("listen on inet failed: %s\n", strerror (errno));
+ if (server_un != -1 && listen (server_un, 5))
+ die ("listen on local failed: %s\n", strerror (errno));
+
+ for (;;)
+ {
+ fd_set rfds;
+ int max_fd;
+ client_t client;
+
+ /* Usually we don't have that many connections, thus it is okay
+ to set them always from scratch and don't maintain an active
+ fd_set. */
+ FD_ZERO (&rfds);
+ max_fd = -1;
+ if (server_in != -1)
+ {
+ FD_SET (server_in, &rfds);
+ max_fd = server_in;
+ }
+ if (server_un != -1)
+ {
+ FD_SET (server_un, &rfds);
+ if (server_un > max_fd)
+ max_fd = server_un;
+ }
+ for (client = client_list; client; client = client->next)
+ if (client->fd != -1)
+ {
+ FD_SET (client->fd, &rfds);
+ if (client->fd > max_fd)
+ max_fd = client->fd;
+ }
+
+ if (select (max_fd + 1, &rfds, NULL, NULL, NULL) <= 0)
+ continue; /* Ignore any errors. */
+
+ if (server_in != -1 && FD_ISSET (server_in, &rfds))
+ setup_client (server_in, 0);
+ if (server_un != -1 && FD_ISSET (server_un, &rfds))
+ setup_client (server_un, 1);
+
+ for (client = client_list; client; client = client->next)
+ if (client->fd != -1 && FD_ISSET (client->fd, &rfds))
+ {
+ char line[256];
+ int n;
+
+ n = read (client->fd, line, sizeof line - 1);
+ if (n < 0)
+ {
+ int save_errno = errno;
+ print_line (client, NULL); /* flush */
+ printf ("[client at fd %d read error: %s]\n",
+ client->fd, strerror (save_errno));
+ close (client->fd);
+ client->fd = -1;
+ }
+ else if (!n)
+ {
+ print_line (client, NULL); /* flush */
+ close (client->fd);
+ printf ("[client at fd %d disconnected]\n", client->fd);
+ client->fd = -1;
+ }
+ else
+ {
+ line[n] = 0;
+ print_line (client, line);
+ }
+ }
+ }
+
+ return 0;
+}
+
+
+/*
+Local Variables:
+compile-command: "gcc -Wall -g -o watchgnupg watchgnupg.c"
+End:
+*/
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