WIP: add a stub IRC daemon named `kike'
As it is going to share a great lot of functionality with ZyklonB, I have decided to extract the common parts into `common.c' and make the two subprojects include this file. The Single Compile Unit concept has proven valuable (sub-second compile times, dead code warnings, almost no need for function declarations, whole-program optimizations), and the sources aren't that long so far anyway. I am probably going to add CMake support later but so far it's not a priority. This project is meant to be portable and freely relocatable (ie. no hardcoded paths if I can avoid it).
This commit is contained in:
parent
165a19da21
commit
705c0e943e
11
Makefile
11
Makefile
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@ -1,17 +1,20 @@
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SHELL = /bin/sh
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SHELL = /bin/sh
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CC = clang
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CC = clang
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CFLAGS = -ggdb -Wall -Wextra -std=c99
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CFLAGS = -ggdb -Wall -Wextra -std=c99
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LDFLAGS = `pkg-config --libs libssl`
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# -lpthread is only there for debugging (gdb & errno)
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LDFLAGS = `pkg-config --libs libssl` -lpthread
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.PHONY: all clean
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.PHONY: all clean
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targets = zyklonb
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targets = zyklonb kike
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all: $(targets)
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all: $(targets)
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clean:
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clean:
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rm -f $(targets)
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rm -f $(targets)
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zyklonb: src/zyklonb.c src/siphash.c
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zyklonb: src/zyklonb.c src/common.c src/siphash.c
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$(CC) $^ -o $@ $(CFLAGS) $(LDFLAGS)
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$(CC) src/zyklonb.c src/siphash.c -o $@ $(CFLAGS) $(LDFLAGS)
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kike: src/kike.c src/common.c src/siphash.c
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$(CC) src/kike.c src/siphash.c -o $@ $(CFLAGS) $(LDFLAGS)
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11
README
11
README
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@ -10,6 +10,17 @@ While originally intended to be a simple C99 rewrite of the original bot, which
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was written in the GNU dialect of AWK, it fairly quickly became a playground
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was written in the GNU dialect of AWK, it fairly quickly became a playground
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where I added everything that seemed nice.
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where I added everything that seemed nice.
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kike
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----
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Also included is a simple IRC daemon that mostly follows the RFC's but is
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limited to single-server networks, due to the protocol being incredibly ugly
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and tricky to implement correctly. Even so, it took me a ridiculous amount of
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time to write. (But it was a valuable exercise and I can reuse the code.)
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Disclaimer
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----------
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I am not an antisemitist, I'm just being an offensive asshole with the naming.
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License
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License
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-------
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-------
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`ZyklonB' is written by Přemysl Janouch <p.janouch@gmail.com>.
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`ZyklonB' is written by Přemysl Janouch <p.janouch@gmail.com>.
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,796 @@
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/*
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* kike.c: the experimental IRC daemon
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*
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* Copyright (c) 2014, Přemysl Janouch <p.janouch@gmail.com>
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* All rights reserved.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#define PROGRAM_NAME "kike"
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#define PROGRAM_VERSION "alpha"
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#include "common.c"
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// --- Configuration (application-specific) ------------------------------------
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static struct config_item g_config_table[] =
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{
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{ "server_name", NULL, "Server name" },
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{ "bind_host", NULL, "Address of the IRC server" },
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{ "bind_port", "6667", "Port of the IRC server" },
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{ "ssl_cert", NULL, "Server SSL certificate (PEM)" },
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{ "ssl_key", NULL, "Server SSL private key (PEM)" },
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{ "max_connections", NULL, "Maximum client connections" },
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{ NULL, NULL, NULL }
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};
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// --- Signals -----------------------------------------------------------------
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static int g_signal_pipe[2]; ///< A pipe used to signal... signals
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/// Program termination has been requested by a signal
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static volatile sig_atomic_t g_termination_requested;
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static void
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sigterm_handler (int signum)
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{
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(void) signum;
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g_termination_requested = true;
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int original_errno = errno;
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if (write (g_signal_pipe[1], "t", 1) == -1)
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soft_assert (errno == EAGAIN);
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errno = original_errno;
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}
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static void
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setup_signal_handlers (void)
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{
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if (pipe (g_signal_pipe) == -1)
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{
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print_fatal ("pipe: %s", strerror (errno));
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exit (EXIT_FAILURE);
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}
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set_cloexec (g_signal_pipe[0]);
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set_cloexec (g_signal_pipe[1]);
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// So that the pipe cannot overflow; it would make write() block within
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// the signal handler, which is something we really don't want to happen.
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// The same holds true for read().
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set_blocking (g_signal_pipe[0], false);
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set_blocking (g_signal_pipe[1], false);
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signal (SIGPIPE, SIG_IGN);
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struct sigaction sa;
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sa.sa_flags = SA_RESTART;
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sigemptyset (&sa.sa_mask);
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sa.sa_handler = sigterm_handler;
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if (sigaction (SIGINT, &sa, NULL) == -1
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|| sigaction (SIGTERM, &sa, NULL) == -1)
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{
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print_error ("sigaction: %s", strerror (errno));
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exit (EXIT_FAILURE);
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}
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}
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// --- Application data --------------------------------------------------------
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enum
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{
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IRC_USER_MODE_INVISIBLE = (1 << 0),
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IRC_USER_MODE_RX_WALLOPS = (1 << 1),
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IRC_USER_MODE_RESTRICTED = (1 << 2),
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IRC_USER_MODE_OPERATOR = (1 << 3),
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IRC_USER_MODE_RX_SERVER_NOTICES = (1 << 4)
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};
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struct connection
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{
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struct connection *next; ///< The next link in a chain
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struct connection *prev; ///< The previous link in a chain
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struct server_context *ctx; ///< Server context
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int socket_fd; ///< The TCP socket
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struct str read_buffer; ///< Unprocessed input
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struct str write_buffer; ///< Output yet to be sent out
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unsigned initialized : 1; ///< Has any data been received yet?
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unsigned ssl_rx_want_tx : 1; ///< SSL_read() wants to write
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unsigned ssl_tx_want_rx : 1; ///< SSL_write() wants to read
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SSL_CTX *ssl_ctx; ///< SSL context
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SSL *ssl; ///< SSL connection
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char *nickname; ///< IRC nickname (main identifier)
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char *username; ///< IRC username
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char *fullname; ///< IRC fullname (e-mail)
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char *hostname; ///< Hostname shown to the network
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unsigned mode; ///< User's mode
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char *away_message; ///< Away message
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};
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static void
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connection_init (struct connection *self)
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{
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memset (self, 0, sizeof *self);
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self->socket_fd = -1;
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str_init (&self->read_buffer);
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str_init (&self->write_buffer);
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}
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static void
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connection_free (struct connection *self)
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{
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if (!soft_assert (self->socket_fd == -1))
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xclose (self->socket_fd);
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if (self->ssl_ctx)
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SSL_CTX_free (self->ssl_ctx);
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if (self->ssl)
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SSL_free (self->ssl);
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str_free (&self->read_buffer);
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str_free (&self->write_buffer);
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free (self->nickname);
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free (self->username);
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free (self->fullname);
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free (self->hostname);
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free (self->away_message);
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}
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enum
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{
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IRC_CHAN_MODE_INVITE_ONLY = (1 << 0),
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IRC_CHAN_MODE_MODERATED = (1 << 1),
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IRC_CHAN_MODE_NO_OUTSIDE_MSGS = (1 << 2),
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IRC_CHAN_MODE_SECRET = (1 << 3),
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IRC_CHAN_MODE_PRIVATE = (1 << 4),
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IRC_CHAN_MODE_PROTECTED_TOPIC = (1 << 5),
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IRC_CHAN_MODE_QUIET = (1 << 6)
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};
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struct channel
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{
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struct server_context *ctx; ///< Server context
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char *name; ///< Channel name
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unsigned modes; ///< Channel modes
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char *key; ///< Channel key
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long user_limit; ///< User limit or -1
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struct str_vector ban_list; ///< Ban list
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struct str_vector exception_list; ///< Exceptions from bans
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struct str_vector invite_list; ///< Exceptions from +I
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};
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static void
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channel_init (struct channel *self)
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{
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memset (self, 0, sizeof *self);
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str_vector_init (&self->ban_list);
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str_vector_init (&self->exception_list);
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str_vector_init (&self->invite_list);
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}
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static void
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channel_free (struct channel *self)
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{
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free (self->name);
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free (self->key);
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str_vector_free (&self->ban_list);
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str_vector_free (&self->exception_list);
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str_vector_free (&self->invite_list);
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}
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struct server_context
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{
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struct str_map config; ///< Server configuration
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int listen_fd; ///< Listening socket FD
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struct connection *clients; ///< Client connections
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struct str_map users; ///< Maps nicknames to connections
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struct str_map channels; ///< Maps channel names to data
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struct poller poller; ///< Manages polled description
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bool polling; ///< The event loop is running
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};
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static void
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server_context_init (struct server_context *self)
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{
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str_map_init (&self->config);
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self->config.free = free;
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load_config_defaults (&self->config, g_config_table);
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self->listen_fd = -1;
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self->clients = NULL;
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str_map_init (&self->users);
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// TODO: set channel_free() as the free function?
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str_map_init (&self->channels);
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poller_init (&self->poller);
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self->polling = false;
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|
}
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||||||
|
static void
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||||||
|
server_context_free (struct server_context *self)
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||||||
|
{
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||||||
|
str_map_free (&self->config);
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|
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|
if (self->listen_fd != -1)
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|
xclose (self->listen_fd);
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|
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||||||
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// TODO: terminate the connections properly before this is called
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struct connection *link, *tmp;
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|
for (link = self->clients; link; link = tmp)
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||||||
|
{
|
||||||
|
tmp = link->next;
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||||||
|
connection_free (link);
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||||||
|
free (link);
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||||||
|
}
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|
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||||||
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str_map_free (&self->users);
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str_map_free (&self->channels);
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poller_free (&self->poller);
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||||||
|
}
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|
|
||||||
|
// --- Main program ------------------------------------------------------------
|
||||||
|
|
||||||
|
static size_t network_error_domain_tag;
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||||||
|
#define NETWORK_ERROR (error_resolve_domain (&network_error_domain_tag))
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||||||
|
|
||||||
|
enum
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||||||
|
{
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||||||
|
NETWORK_ERROR_INVALID_CONFIGURATION,
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|
NETWORK_ERROR_FAILED
|
||||||
|
};
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||||||
|
|
||||||
|
static bool
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||||||
|
irc_autodetect_ssl (struct connection *conn)
|
||||||
|
{
|
||||||
|
// Trivial SSL/TLS autodetection. The first block of data returned by
|
||||||
|
// recv() must be at least three bytes long for this to work reliably,
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|
// but that should not pose a problem in practice.
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||||||
|
//
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|
// SSL2: 1xxx xxxx | xxxx xxxx | <1>
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|
// (message length) (client hello)
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|
// SSL3/TLS: <22> | <3> | xxxx xxxx
|
||||||
|
// (handshake)| (protocol version)
|
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|
//
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|
// Such byte sequences should never occur at the beginning of regular IRC
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|
// communication, which usually begins with USER/NICK/PASS/SERVICE.
|
||||||
|
|
||||||
|
char buf[3];
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|
start:
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|
switch (recv (conn->socket_fd, buf, sizeof buf, MSG_PEEK))
|
||||||
|
{
|
||||||
|
case 3:
|
||||||
|
if ((buf[0] & 0x80) && buf[2] == 1)
|
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|
return true;
|
||||||
|
case 2:
|
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|
if (buf[0] == 22 && buf[1] == 3)
|
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|
return true;
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|
break;
|
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|
case 1:
|
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|
if (buf[0] == 22)
|
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|
return true;
|
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|
break;
|
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|
case 0:
|
||||||
|
break;
|
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|
default:
|
||||||
|
if (errno == EINTR)
|
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|
goto start;
|
||||||
|
}
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int
|
||||||
|
irc_ssl_verify_callback (int verify_ok, X509_STORE_CTX *ctx)
|
||||||
|
{
|
||||||
|
(void) verify_ok;
|
||||||
|
(void) ctx;
|
||||||
|
|
||||||
|
// We only want to provide additional privileges based on the client's
|
||||||
|
// certificate, so let's not terminate the connection because of a failure.
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
static bool
|
||||||
|
irc_initialize_ssl (struct connection *conn)
|
||||||
|
{
|
||||||
|
struct server_context *ctx = conn->ctx;
|
||||||
|
|
||||||
|
conn->ssl_ctx = SSL_CTX_new (SSLv23_server_method ());
|
||||||
|
if (!conn->ssl_ctx)
|
||||||
|
goto error_ssl_1;
|
||||||
|
SSL_CTX_set_verify (conn->ssl_ctx,
|
||||||
|
SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, irc_ssl_verify_callback);
|
||||||
|
// XXX: maybe we should call SSL_CTX_set_options() for some workarounds
|
||||||
|
|
||||||
|
conn->ssl = SSL_new (conn->ssl_ctx);
|
||||||
|
if (!conn->ssl)
|
||||||
|
goto error_ssl_2;
|
||||||
|
|
||||||
|
const char *ssl_cert = str_map_find (&ctx->config, "ssl_cert");
|
||||||
|
if (ssl_cert
|
||||||
|
&& !SSL_CTX_use_certificate_chain_file (conn->ssl_ctx, ssl_cert))
|
||||||
|
{
|
||||||
|
// XXX: perhaps we should read the file ourselves for better messages
|
||||||
|
print_error ("%s: %s", "setting the SSL client certificate failed",
|
||||||
|
ERR_error_string (ERR_get_error (), NULL));
|
||||||
|
}
|
||||||
|
|
||||||
|
const char *ssl_key = str_map_find (&ctx->config, "ssl_key");
|
||||||
|
if (ssl_key
|
||||||
|
&& !SSL_use_PrivateKey_file (conn->ssl, ssl_key, SSL_FILETYPE_PEM))
|
||||||
|
{
|
||||||
|
// XXX: perhaps we should read the file ourselves for better messages
|
||||||
|
print_error ("%s: %s", "setting the SSL private key failed",
|
||||||
|
ERR_error_string (ERR_get_error (), NULL));
|
||||||
|
}
|
||||||
|
|
||||||
|
// TODO: SSL_check_private_key(conn->ssl)? It is has probably already been
|
||||||
|
// checked by SSL_use_PrivateKey_file() above.
|
||||||
|
|
||||||
|
SSL_set_accept_state (conn->ssl);
|
||||||
|
if (!SSL_set_fd (conn->ssl, conn->socket_fd))
|
||||||
|
goto error_ssl_3;
|
||||||
|
// Gah, spare me your awkward semantics, I just want to push data!
|
||||||
|
// XXX: do we want SSL_MODE_AUTO_RETRY as well? I guess not.
|
||||||
|
SSL_set_mode (conn->ssl,
|
||||||
|
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER | SSL_MODE_ENABLE_PARTIAL_WRITE);
|
||||||
|
return true;
|
||||||
|
|
||||||
|
error_ssl_3:
|
||||||
|
SSL_free (conn->ssl);
|
||||||
|
conn->ssl = NULL;
|
||||||
|
error_ssl_2:
|
||||||
|
SSL_CTX_free (conn->ssl_ctx);
|
||||||
|
conn->ssl_ctx = NULL;
|
||||||
|
error_ssl_1:
|
||||||
|
// XXX: these error strings are really nasty; also there could be
|
||||||
|
// multiple errors on the OpenSSL stack.
|
||||||
|
print_error ("%s: %s", "could not initialize SSL",
|
||||||
|
ERR_error_string (ERR_get_error (), NULL));
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
connection_abort (struct connection *conn, const char *reason)
|
||||||
|
{
|
||||||
|
// TODO: send a QUIT message with `reason' || "Client exited"
|
||||||
|
(void) reason;
|
||||||
|
|
||||||
|
// TODO: do further cleanup if the client has successfully registered
|
||||||
|
|
||||||
|
struct server_context *ctx = conn->ctx;
|
||||||
|
ssize_t i = poller_find_by_fd (&ctx->poller, conn->socket_fd);
|
||||||
|
if (i != -1)
|
||||||
|
poller_remove_at_index (&ctx->poller, i);
|
||||||
|
|
||||||
|
xclose (conn->socket_fd);
|
||||||
|
conn->socket_fd = -1;
|
||||||
|
connection_free (conn);
|
||||||
|
LIST_UNLINK (ctx->clients, conn);
|
||||||
|
free (conn);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
irc_process_message (const struct irc_message *msg,
|
||||||
|
const char *raw, void *user_data)
|
||||||
|
{
|
||||||
|
struct connection *conn = user_data;
|
||||||
|
// TODO
|
||||||
|
}
|
||||||
|
|
||||||
|
static bool
|
||||||
|
irc_try_read (struct connection *conn)
|
||||||
|
{
|
||||||
|
// TODO
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
static bool
|
||||||
|
irc_try_read_ssl (struct connection *conn)
|
||||||
|
{
|
||||||
|
if (conn->ssl_tx_want_rx)
|
||||||
|
return true;
|
||||||
|
|
||||||
|
struct str *buf = &conn->read_buffer;
|
||||||
|
conn->ssl_rx_want_tx = false;
|
||||||
|
while (true)
|
||||||
|
{
|
||||||
|
str_ensure_space (buf, 512);
|
||||||
|
int n_read = SSL_read (conn->ssl, buf->str + buf->len,
|
||||||
|
buf->alloc - buf->len - 1 /* null byte */);
|
||||||
|
|
||||||
|
const char *error_info = NULL;
|
||||||
|
switch (xssl_get_error (conn->ssl, n_read, &error_info))
|
||||||
|
{
|
||||||
|
case SSL_ERROR_NONE:
|
||||||
|
buf->str[buf->len += n_read] = '\0';
|
||||||
|
// TODO: discard characters above the 512 character limit
|
||||||
|
irc_process_buffer (buf, irc_process_message, conn);
|
||||||
|
continue;
|
||||||
|
case SSL_ERROR_ZERO_RETURN:
|
||||||
|
connection_abort (conn, NULL);
|
||||||
|
return false;
|
||||||
|
case SSL_ERROR_WANT_READ:
|
||||||
|
return true;
|
||||||
|
case SSL_ERROR_WANT_WRITE:
|
||||||
|
conn->ssl_rx_want_tx = true;
|
||||||
|
return false;
|
||||||
|
case XSSL_ERROR_TRY_AGAIN:
|
||||||
|
continue;
|
||||||
|
default:
|
||||||
|
print_debug ("%s: %s: %s", __func__, "SSL_read", error_info);
|
||||||
|
connection_abort (conn, error_info);
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static bool
|
||||||
|
irc_try_write (struct connection *conn)
|
||||||
|
{
|
||||||
|
// TODO
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
static bool
|
||||||
|
irc_try_write_ssl (struct connection *conn)
|
||||||
|
{
|
||||||
|
if (conn->ssl_rx_want_tx)
|
||||||
|
return true;
|
||||||
|
|
||||||
|
struct str *buf = &conn->write_buffer;
|
||||||
|
conn->ssl_tx_want_rx = false;
|
||||||
|
while (buf->len)
|
||||||
|
{
|
||||||
|
int n_written = SSL_write (conn->ssl, buf->str, buf->len);
|
||||||
|
|
||||||
|
const char *error_info = NULL;
|
||||||
|
switch (xssl_get_error (conn->ssl, n_written, &error_info))
|
||||||
|
{
|
||||||
|
case SSL_ERROR_NONE:
|
||||||
|
str_remove_slice (buf, 0, n_written);
|
||||||
|
continue;
|
||||||
|
case SSL_ERROR_ZERO_RETURN:
|
||||||
|
connection_abort (conn, NULL);
|
||||||
|
return false;
|
||||||
|
case SSL_ERROR_WANT_WRITE:
|
||||||
|
return true;
|
||||||
|
case SSL_ERROR_WANT_READ:
|
||||||
|
conn->ssl_tx_want_rx = true;
|
||||||
|
return false;
|
||||||
|
case XSSL_ERROR_TRY_AGAIN:
|
||||||
|
continue;
|
||||||
|
default:
|
||||||
|
print_debug ("%s: %s: %s", __func__, "SSL_write", error_info);
|
||||||
|
connection_abort (conn, error_info);
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
on_irc_client_ready (const struct pollfd *pfd, void *user_data)
|
||||||
|
{
|
||||||
|
// XXX: check/load `ssl_cert' and `ssl_key' earlier?
|
||||||
|
struct connection *conn = user_data;
|
||||||
|
if (!conn->initialized)
|
||||||
|
{
|
||||||
|
hard_assert (pfd->events == POLLIN);
|
||||||
|
// XXX: what with the error from irc_initialize_ssl()?
|
||||||
|
if (irc_autodetect_ssl (conn) && !irc_initialize_ssl (conn))
|
||||||
|
{
|
||||||
|
connection_abort (conn, NULL);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
conn->initialized = true;
|
||||||
|
}
|
||||||
|
|
||||||
|
// FIXME: aborting a connection inside try_read() will fuck things up
|
||||||
|
int new_events = 0;
|
||||||
|
if (conn->ssl)
|
||||||
|
{
|
||||||
|
// Reads may want to write, writes may want to read, poll() may
|
||||||
|
// return unexpected things in `revents'... let's try both
|
||||||
|
irc_try_read_ssl (conn) && irc_try_write_ssl (conn);
|
||||||
|
|
||||||
|
new_events |= POLLIN;
|
||||||
|
if (conn->write_buffer.len || conn->ssl_rx_want_tx)
|
||||||
|
new_events |= POLLOUT;
|
||||||
|
|
||||||
|
// While we're waiting for an opposite event, we ignore the original
|
||||||
|
if (conn->ssl_rx_want_tx) new_events &= ~POLLIN;
|
||||||
|
if (conn->ssl_tx_want_rx) new_events &= ~POLLOUT;
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
irc_try_read (conn) && irc_try_write (conn);
|
||||||
|
|
||||||
|
new_events |= POLLIN;
|
||||||
|
if (conn->write_buffer.len)
|
||||||
|
new_events |= POLLOUT;
|
||||||
|
}
|
||||||
|
|
||||||
|
hard_assert (new_events != 0);
|
||||||
|
if (pfd->events != new_events)
|
||||||
|
poller_set (&conn->ctx->poller, conn->socket_fd, new_events,
|
||||||
|
(poller_dispatcher_func) on_irc_client_ready, conn);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
on_irc_connection_available (const struct pollfd *pfd, void *user_data)
|
||||||
|
{
|
||||||
|
(void) pfd;
|
||||||
|
struct server_context *ctx = user_data;
|
||||||
|
|
||||||
|
// TODO: stop accepting new connections when `max_connections' is reached
|
||||||
|
|
||||||
|
while (true)
|
||||||
|
{
|
||||||
|
// XXX: `struct sockaddr_storage' is not the most portable thing
|
||||||
|
struct sockaddr_storage peer;
|
||||||
|
socklen_t peer_len = sizeof peer;
|
||||||
|
|
||||||
|
int fd = accept (ctx->listen_fd, (struct sockaddr *) &peer, &peer_len);
|
||||||
|
if (fd == -1)
|
||||||
|
{
|
||||||
|
if (errno == EAGAIN)
|
||||||
|
break;
|
||||||
|
if (errno == EINTR)
|
||||||
|
continue;
|
||||||
|
if (errno == ECONNABORTED)
|
||||||
|
continue;
|
||||||
|
|
||||||
|
// TODO: handle resource exhaustion (EMFILE, ENFILE) specially
|
||||||
|
// (stop accepting new connections and wait until we close some).
|
||||||
|
print_fatal ("%s: %s", "accept", strerror (errno));
|
||||||
|
|
||||||
|
// FIXME: handle this better, bring the server down cleanly.
|
||||||
|
exit (EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
|
||||||
|
char host[NI_MAXHOST] = "unknown", port[NI_MAXSERV] = "unknown";
|
||||||
|
int err = getnameinfo ((struct sockaddr *) &peer, peer_len,
|
||||||
|
host, sizeof host, port, sizeof port, AI_NUMERICSERV);
|
||||||
|
if (err)
|
||||||
|
print_debug ("%s: %s", "getnameinfo", gai_strerror (err));
|
||||||
|
print_debug ("accepted connection from %s:%s", host, port);
|
||||||
|
|
||||||
|
struct connection *conn = xmalloc (sizeof *conn);
|
||||||
|
connection_init (conn);
|
||||||
|
conn->socket_fd = fd;
|
||||||
|
conn->hostname = xstrdup (host);
|
||||||
|
LIST_PREPEND (ctx->clients, conn);
|
||||||
|
|
||||||
|
// TODO: set a timeout on the socket, something like 3 minutes, then we
|
||||||
|
// should terminate the connection.
|
||||||
|
poller_set (&ctx->poller, conn->socket_fd, POLLIN,
|
||||||
|
(poller_dispatcher_func) on_irc_client_ready, conn);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static bool
|
||||||
|
irc_listen (struct server_context *ctx, struct error **e)
|
||||||
|
{
|
||||||
|
const char *bind_host = str_map_find (&ctx->config, "bind_host");
|
||||||
|
const char *bind_port = str_map_find (&ctx->config, "bind_port");
|
||||||
|
hard_assert (bind_port != NULL); // We have a default value for this
|
||||||
|
|
||||||
|
struct addrinfo gai_hints, *gai_result, *gai_iter;
|
||||||
|
memset (&gai_hints, 0, sizeof gai_hints);
|
||||||
|
|
||||||
|
gai_hints.ai_socktype = SOCK_STREAM;
|
||||||
|
gai_hints.ai_flags = AI_PASSIVE;
|
||||||
|
|
||||||
|
int err = getaddrinfo (bind_host, bind_port, &gai_hints, &gai_result);
|
||||||
|
if (err)
|
||||||
|
{
|
||||||
|
error_set (e, NETWORK_ERROR, NETWORK_ERROR_FAILED, "%s: %s: %s",
|
||||||
|
"network setup failed", "getaddrinfo", gai_strerror (err));
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
int sockfd;
|
||||||
|
char real_host[NI_MAXHOST], real_port[NI_MAXSERV];
|
||||||
|
|
||||||
|
for (gai_iter = gai_result; gai_iter; gai_iter = gai_iter->ai_next)
|
||||||
|
{
|
||||||
|
sockfd = socket (gai_iter->ai_family,
|
||||||
|
gai_iter->ai_socktype, gai_iter->ai_protocol);
|
||||||
|
if (sockfd == -1)
|
||||||
|
continue;
|
||||||
|
set_cloexec (sockfd);
|
||||||
|
|
||||||
|
int yes = 1;
|
||||||
|
soft_assert (setsockopt (sockfd, SOL_SOCKET, SO_KEEPALIVE,
|
||||||
|
&yes, sizeof yes) != -1);
|
||||||
|
soft_assert (setsockopt (sockfd, SOL_SOCKET, SO_REUSEADDR,
|
||||||
|
&yes, sizeof yes) != -1);
|
||||||
|
|
||||||
|
real_host[0] = real_port[0] = '\0';
|
||||||
|
err = getnameinfo (gai_iter->ai_addr, gai_iter->ai_addrlen,
|
||||||
|
real_host, sizeof real_host, real_port, sizeof real_port,
|
||||||
|
NI_NUMERICHOST | NI_NUMERICSERV);
|
||||||
|
if (err)
|
||||||
|
print_debug ("%s: %s", "getnameinfo", gai_strerror (err));
|
||||||
|
|
||||||
|
if (bind (sockfd, gai_iter->ai_addr, gai_iter->ai_addrlen))
|
||||||
|
print_error ("bind() to %s:%s failed: %s",
|
||||||
|
real_host, real_port, strerror (errno));
|
||||||
|
else if (listen (sockfd, 16 /* arbitrary number */))
|
||||||
|
print_error ("listen() at %s:%s failed: %s",
|
||||||
|
real_host, real_port, strerror (errno));
|
||||||
|
else
|
||||||
|
break;
|
||||||
|
|
||||||
|
xclose (sockfd);
|
||||||
|
}
|
||||||
|
|
||||||
|
freeaddrinfo (gai_result);
|
||||||
|
|
||||||
|
if (!gai_iter)
|
||||||
|
{
|
||||||
|
error_set (e, NETWORK_ERROR, NETWORK_ERROR_FAILED,
|
||||||
|
"network setup failed");
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
ctx->listen_fd = sockfd;
|
||||||
|
poller_set (&ctx->poller, ctx->listen_fd, POLLIN,
|
||||||
|
(poller_dispatcher_func) on_irc_connection_available, ctx);
|
||||||
|
|
||||||
|
print_status ("listening at %s:%s", real_host, real_port);
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
on_signal_pipe_readable (const struct pollfd *fd, struct server_context *ctx)
|
||||||
|
{
|
||||||
|
char *dummy;
|
||||||
|
(void) read (fd->fd, &dummy, 1);
|
||||||
|
|
||||||
|
#if 0
|
||||||
|
// TODO
|
||||||
|
if (g_termination_requested && !ctx->quitting)
|
||||||
|
{
|
||||||
|
initiate_quit (ctx);
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
print_usage (const char *program_name)
|
||||||
|
{
|
||||||
|
fprintf (stderr,
|
||||||
|
"Usage: %s [OPTION]...\n"
|
||||||
|
"Experimental IRC server.\n"
|
||||||
|
"\n"
|
||||||
|
" -d, --debug run in debug mode (do not daemonize)\n"
|
||||||
|
" -h, --help display this help and exit\n"
|
||||||
|
" -V, --version output version information and exit\n"
|
||||||
|
" --write-default-cfg [filename]\n"
|
||||||
|
" write a default configuration file and exit\n",
|
||||||
|
program_name);
|
||||||
|
}
|
||||||
|
|
||||||
|
int
|
||||||
|
main (int argc, char *argv[])
|
||||||
|
{
|
||||||
|
const char *invocation_name = argv[0];
|
||||||
|
|
||||||
|
struct error *e = NULL;
|
||||||
|
static struct option opts[] =
|
||||||
|
{
|
||||||
|
{ "debug", no_argument, NULL, 'd' },
|
||||||
|
{ "help", no_argument, NULL, 'h' },
|
||||||
|
{ "version", no_argument, NULL, 'V' },
|
||||||
|
{ "write-default-cfg", optional_argument, NULL, 'w' },
|
||||||
|
{ NULL, 0, NULL, 0 }
|
||||||
|
};
|
||||||
|
|
||||||
|
while (1)
|
||||||
|
{
|
||||||
|
int c, opt_index;
|
||||||
|
|
||||||
|
c = getopt_long (argc, argv, "dhV", opts, &opt_index);
|
||||||
|
if (c == -1)
|
||||||
|
break;
|
||||||
|
|
||||||
|
switch (c)
|
||||||
|
{
|
||||||
|
case 'd':
|
||||||
|
g_debug_mode = true;
|
||||||
|
break;
|
||||||
|
case 'h':
|
||||||
|
print_usage (invocation_name);
|
||||||
|
exit (EXIT_SUCCESS);
|
||||||
|
case 'V':
|
||||||
|
printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
|
||||||
|
exit (EXIT_SUCCESS);
|
||||||
|
case 'w':
|
||||||
|
{
|
||||||
|
char *filename = write_default_config (optarg, g_config_table, &e);
|
||||||
|
if (!filename)
|
||||||
|
{
|
||||||
|
print_fatal ("%s", e->message);
|
||||||
|
error_free (e);
|
||||||
|
exit (EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
print_status ("configuration written to `%s'", filename);
|
||||||
|
free (filename);
|
||||||
|
exit (EXIT_SUCCESS);
|
||||||
|
}
|
||||||
|
default:
|
||||||
|
print_fatal ("error in options");
|
||||||
|
exit (EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
print_status (PROGRAM_NAME " " PROGRAM_VERSION " starting");
|
||||||
|
setup_signal_handlers ();
|
||||||
|
|
||||||
|
SSL_library_init ();
|
||||||
|
atexit (EVP_cleanup);
|
||||||
|
SSL_load_error_strings ();
|
||||||
|
// XXX: ERR_load_BIO_strings()? Anything else?
|
||||||
|
atexit (ERR_free_strings);
|
||||||
|
|
||||||
|
struct server_context ctx;
|
||||||
|
server_context_init (&ctx);
|
||||||
|
|
||||||
|
if (!read_config_file (&ctx.config, &e))
|
||||||
|
{
|
||||||
|
print_fatal ("error loading configuration: %s", e->message);
|
||||||
|
error_free (e);
|
||||||
|
exit (EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
|
||||||
|
poller_set (&ctx.poller, g_signal_pipe[0], POLLIN,
|
||||||
|
(poller_dispatcher_func) on_signal_pipe_readable, &ctx);
|
||||||
|
|
||||||
|
if (!irc_listen (&ctx, &e))
|
||||||
|
{
|
||||||
|
print_error ("%s", e->message);
|
||||||
|
error_free (e);
|
||||||
|
exit (EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
|
||||||
|
// TODO: daemonize
|
||||||
|
|
||||||
|
ctx.polling = true;
|
||||||
|
while (ctx.polling)
|
||||||
|
poller_run (&ctx.poller);
|
||||||
|
|
||||||
|
server_context_free (&ctx);
|
||||||
|
return EXIT_SUCCESS;
|
||||||
|
}
|
||||||
1673
src/zyklonb.c
1673
src/zyklonb.c
File diff suppressed because it is too large
Load Diff
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Reference in New Issue