496 lines
10 KiB
C++
496 lines
10 KiB
C++
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/* Replay a remote debug session logfile for GDB.
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Copyright (C) 1996-2022 Free Software Foundation, Inc.
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Written by Fred Fish (fnf@cygnus.com) from pieces of gdbserver.
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This file is part of GDB.
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This program 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 3 of the License, or
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(at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "gdbsupport/common-defs.h"
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#undef PACKAGE
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#undef PACKAGE_NAME
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#undef PACKAGE_VERSION
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#undef PACKAGE_STRING
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#undef PACKAGE_TARNAME
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#include <config.h>
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#include "gdbsupport/version.h"
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#if HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#if HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#include <ctype.h>
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#include <unistd.h>
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#if HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#if HAVE_NETINET_TCP_H
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#include <netinet/tcp.h>
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#endif
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#if USE_WIN32API
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#include <ws2tcpip.h>
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#endif
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#include "gdbsupport/netstuff.h"
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#include "gdbsupport/rsp-low.h"
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#ifndef HAVE_SOCKLEN_T
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typedef int socklen_t;
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#endif
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/* Sort of a hack... */
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#define EOL (EOF - 1)
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static int remote_desc_in;
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static int remote_desc_out;
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static void
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sync_error (FILE *fp, const char *desc, int expect, int got)
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{
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fprintf (stderr, "\n%s\n", desc);
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fprintf (stderr, "At logfile offset %ld, expected '0x%x' got '0x%x'\n",
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ftell (fp), expect, got);
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fflush (stderr);
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exit (1);
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}
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static void
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remote_error (const char *desc)
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{
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fprintf (stderr, "\n%s\n", desc);
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fflush (stderr);
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exit (1);
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}
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static void
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remote_close (void)
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{
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#ifdef USE_WIN32API
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gdb_assert (remote_desc_in == remote_desc_out);
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closesocket (remote_desc_in);
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#else
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close (remote_desc_in);
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if (remote_desc_in != remote_desc_out)
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close (remote_desc_out);
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#endif
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}
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/* Open a connection to a remote debugger.
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NAME is the filename used for communication. */
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static void
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remote_open (const char *name)
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{
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#ifndef USE_WIN32API
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if (strcmp (name, "-") == 0)
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{
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remote_desc_in = 0;
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remote_desc_out = 1;
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return;
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}
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#endif
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const char *last_colon = strrchr (name, ':');
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if (last_colon == NULL)
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{
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fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);
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fflush (stderr);
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exit (1);
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}
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#ifdef USE_WIN32API
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static int winsock_initialized;
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#endif
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int tmp;
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int tmp_desc;
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struct addrinfo hint;
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struct addrinfo *ainfo;
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memset (&hint, 0, sizeof (hint));
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/* Assume no prefix will be passed, therefore we should use
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AF_UNSPEC. */
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hint.ai_family = AF_UNSPEC;
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hint.ai_socktype = SOCK_STREAM;
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hint.ai_protocol = IPPROTO_TCP;
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parsed_connection_spec parsed = parse_connection_spec (name, &hint);
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if (parsed.port_str.empty ())
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error (_("Missing port on hostname '%s'"), name);
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#ifdef USE_WIN32API
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if (!winsock_initialized)
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{
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WSADATA wsad;
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WSAStartup (MAKEWORD (1, 0), &wsad);
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winsock_initialized = 1;
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}
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#endif
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int r = getaddrinfo (parsed.host_str.c_str (), parsed.port_str.c_str (),
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&hint, &ainfo);
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if (r != 0)
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{
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fprintf (stderr, "%s:%s: cannot resolve name: %s\n",
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parsed.host_str.c_str (), parsed.port_str.c_str (),
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gai_strerror (r));
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fflush (stderr);
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exit (1);
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}
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scoped_free_addrinfo free_ainfo (ainfo);
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struct addrinfo *p;
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for (p = ainfo; p != NULL; p = p->ai_next)
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{
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tmp_desc = socket (p->ai_family, p->ai_socktype, p->ai_protocol);
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if (tmp_desc >= 0)
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break;
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}
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if (p == NULL)
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perror_with_name ("Cannot open socket");
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/* Allow rapid reuse of this port. */
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tmp = 1;
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setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,
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sizeof (tmp));
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switch (p->ai_family)
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{
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case AF_INET:
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((struct sockaddr_in *) p->ai_addr)->sin_addr.s_addr = INADDR_ANY;
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break;
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case AF_INET6:
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((struct sockaddr_in6 *) p->ai_addr)->sin6_addr = in6addr_any;
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break;
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default:
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fprintf (stderr, "Invalid 'ai_family' %d\n", p->ai_family);
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exit (1);
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}
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if (bind (tmp_desc, p->ai_addr, p->ai_addrlen) != 0)
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perror_with_name ("Can't bind address");
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if (p->ai_socktype == SOCK_DGRAM)
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remote_desc_in = tmp_desc;
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else
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{
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struct sockaddr_storage sockaddr;
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socklen_t sockaddrsize = sizeof (sockaddr);
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char orig_host[GDB_NI_MAX_ADDR], orig_port[GDB_NI_MAX_PORT];
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if (listen (tmp_desc, 1) != 0)
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perror_with_name ("Can't listen on socket");
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remote_desc_in = accept (tmp_desc, (struct sockaddr *) &sockaddr,
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&sockaddrsize);
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if (remote_desc_in == -1)
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perror_with_name ("Accept failed");
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/* Enable TCP keep alive process. */
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tmp = 1;
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setsockopt (tmp_desc, SOL_SOCKET, SO_KEEPALIVE,
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(char *) &tmp, sizeof (tmp));
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/* Tell TCP not to delay small packets. This greatly speeds up
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interactive response. */
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tmp = 1;
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setsockopt (remote_desc_in, IPPROTO_TCP, TCP_NODELAY,
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(char *) &tmp, sizeof (tmp));
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if (getnameinfo ((struct sockaddr *) &sockaddr, sockaddrsize,
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orig_host, sizeof (orig_host),
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orig_port, sizeof (orig_port),
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NI_NUMERICHOST | NI_NUMERICSERV) == 0)
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{
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fprintf (stderr, "Remote debugging from host %s, port %s\n",
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orig_host, orig_port);
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fflush (stderr);
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}
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#ifndef USE_WIN32API
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close (tmp_desc); /* No longer need this */
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signal (SIGPIPE, SIG_IGN); /* If we don't do this, then
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gdbreplay simply exits when
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the remote side dies. */
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#else
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closesocket (tmp_desc); /* No longer need this */
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#endif
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}
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#if defined(F_SETFL) && defined (FASYNC)
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fcntl (remote_desc_in, F_SETFL, FASYNC);
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#endif
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remote_desc_out = remote_desc_in;
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fprintf (stderr, "Replay logfile using %s\n", name);
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fflush (stderr);
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}
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static int
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logchar (FILE *fp)
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{
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int ch;
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int ch2;
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ch = fgetc (fp);
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if (ch != '\r')
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{
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fputc (ch, stderr);
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fflush (stderr);
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}
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switch (ch)
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{
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/* Treat \r\n as a newline. */
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case '\r':
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ch = fgetc (fp);
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if (ch == '\n')
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ch = EOL;
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else
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{
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ungetc (ch, fp);
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ch = '\r';
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}
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fputc (ch == EOL ? '\n' : '\r', stderr);
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fflush (stderr);
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break;
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case '\n':
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ch = EOL;
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break;
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case '\\':
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ch = fgetc (fp);
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fputc (ch, stderr);
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fflush (stderr);
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switch (ch)
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{
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case '\\':
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break;
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case 'b':
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ch = '\b';
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break;
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case 'f':
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ch = '\f';
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break;
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case 'n':
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ch = '\n';
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break;
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case 'r':
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ch = '\r';
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break;
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case 't':
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ch = '\t';
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break;
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case 'v':
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ch = '\v';
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break;
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case 'x':
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ch2 = fgetc (fp);
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fputc (ch2, stderr);
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fflush (stderr);
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ch = fromhex (ch2) << 4;
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ch2 = fgetc (fp);
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fputc (ch2, stderr);
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fflush (stderr);
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ch |= fromhex (ch2);
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break;
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default:
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/* Treat any other char as just itself */
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break;
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}
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default:
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break;
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}
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return (ch);
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}
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static int
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gdbchar (int desc)
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{
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unsigned char fromgdb;
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if (read (desc, &fromgdb, 1) != 1)
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return -1;
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else
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return fromgdb;
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}
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/* Accept input from gdb and match with chars from fp (after skipping one
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blank) up until a \n is read from fp (which is not matched) */
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static void
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expect (FILE *fp)
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{
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int fromlog;
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int fromgdb;
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if ((fromlog = logchar (fp)) != ' ')
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{
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sync_error (fp, "Sync error during gdb read of leading blank", ' ',
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fromlog);
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}
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do
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{
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fromlog = logchar (fp);
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if (fromlog == EOL)
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break;
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fromgdb = gdbchar (remote_desc_in);
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if (fromgdb < 0)
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remote_error ("Error during read from gdb");
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}
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while (fromlog == fromgdb);
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if (fromlog != EOL)
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{
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sync_error (fp, "Sync error during read of gdb packet from log", fromlog,
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fromgdb);
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}
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}
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/* Play data back to gdb from fp (after skipping leading blank) up until a
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\n is read from fp (which is discarded and not sent to gdb). */
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static void
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play (FILE *fp)
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{
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int fromlog;
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char ch;
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if ((fromlog = logchar (fp)) != ' ')
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{
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sync_error (fp, "Sync error skipping blank during write to gdb", ' ',
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fromlog);
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}
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while ((fromlog = logchar (fp)) != EOL)
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{
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ch = fromlog;
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if (write (remote_desc_out, &ch, 1) != 1)
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remote_error ("Error during write to gdb");
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}
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}
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static void
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gdbreplay_version (void)
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{
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printf ("GNU gdbreplay %s%s\n"
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"Copyright (C) 2022 Free Software Foundation, Inc.\n"
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"gdbreplay is free software, covered by "
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"the GNU General Public License.\n"
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"This gdbreplay was configured as \"%s\"\n",
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PKGVERSION, version, host_name);
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}
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static void
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gdbreplay_usage (FILE *stream)
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{
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fprintf (stream, "Usage:\tgdbreplay LOGFILE HOST:PORT\n");
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if (REPORT_BUGS_TO[0] && stream == stdout)
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fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
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}
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/* Main function. This is called by the real "main" function,
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wrapped in a TRY_CATCH that handles any uncaught exceptions. */
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static void ATTRIBUTE_NORETURN
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captured_main (int argc, char *argv[])
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{
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FILE *fp;
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int ch;
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if (argc >= 2 && strcmp (argv[1], "--version") == 0)
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{
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gdbreplay_version ();
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exit (0);
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}
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if (argc >= 2 && strcmp (argv[1], "--help") == 0)
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{
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gdbreplay_usage (stdout);
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exit (0);
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}
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if (argc < 3)
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{
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gdbreplay_usage (stderr);
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exit (1);
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}
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fp = fopen (argv[1], "r");
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if (fp == NULL)
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{
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perror_with_name (argv[1]);
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}
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remote_open (argv[2]);
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while ((ch = logchar (fp)) != EOF)
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{
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switch (ch)
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{
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case 'w':
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/* data sent from gdb to gdbreplay, accept and match it */
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expect (fp);
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break;
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case 'r':
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/* data sent from gdbreplay to gdb, play it */
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play (fp);
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break;
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case 'c':
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/* Command executed by gdb */
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while ((ch = logchar (fp)) != EOL);
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break;
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}
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}
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remote_close ();
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exit (0);
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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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try
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{
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captured_main (argc, argv);
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}
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catch (const gdb_exception &exception)
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{
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if (exception.reason == RETURN_ERROR)
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{
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fflush (stdout);
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fprintf (stderr, "%s\n", exception.what ());
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}
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exit (1);
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}
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gdb_assert_not_reached ("captured_main should never return");
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}
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