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catgirl/chat.c

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/* Copyright (C) 2020 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7:
*
* If you modify this Program, or any covered work, by linking or
* combining it with OpenSSL (or a modified version of that library),
* containing parts covered by the terms of the OpenSSL License and the
* original SSLeay license, the licensors of this Program grant you
* additional permission to convey the resulting work. Corresponding
* Source for a non-source form of such a combination shall include the
* source code for the parts of OpenSSL used as well as that of the
* covered work.
*/
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <locale.h>
#include <poll.h>
#include <signal.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sysexits.h>
#include <tls.h>
#include <unistd.h>
#include "chat.h"
#ifndef OPENSSL_BIN
#define OPENSSL_BIN "openssl"
#endif
static void genCert(const char *path) {
const char *name = strrchr(path, '/');
name = (name ? &name[1] : path);
char subj[4 + NAME_MAX];
snprintf(subj, sizeof(subj), "/CN=%.*s", (int)strcspn(name, "."), name);
umask(0066);
execlp(
OPENSSL_BIN, "openssl", "req",
"-x509", "-new", "-newkey", "rsa:4096", "-sha256", "-days", "3650",
"-nodes", "-subj", subj, "-out", path, "-keyout", path,
NULL
);
err(EX_UNAVAILABLE, "openssl");
}
char *idNames[IDCap] = {
[None] = "<none>",
[Debug] = "<debug>",
[Network] = "<network>",
};
enum Color idColors[IDCap] = {
[None] = Black,
[Debug] = Green,
[Network] = Gray,
};
uint idNext = Network + 1;
struct Network network = { .userLen = 9, .hostLen = 63 };
struct Self self = { .color = Default };
static const char *save;
static void exitSave(void) {
int error = uiSave(save);
if (error) {
warn("%s", save);
_exit(EX_IOERR);
}
}
uint execID;
int execPipe[2] = { -1, -1 };
int utilPipe[2] = { -1, -1 };
static void execRead(void) {
char buf[1024];
ssize_t len = read(execPipe[0], buf, sizeof(buf) - 1);
if (len < 0) err(EX_IOERR, "read");
if (!len) return;
buf[len] = '\0';
for (char *ptr = buf; ptr;) {
char *line = strsep(&ptr, "\r\n");
if (line[0]) command(execID, line);
}
}
static void utilRead(void) {
char buf[1024];
ssize_t len = read(utilPipe[0], buf, sizeof(buf) - 1);
if (len < 0) err(EX_IOERR, "read");
if (!len) return;
buf[len] = '\0';
for (char *ptr = buf; ptr;) {
char *line = strsep(&ptr, "\r\n");
if (line[0]) uiFormat(Network, Warm, NULL, "%s", line);
}
}
uint32_t hashInit;
uint32_t hashBound = 75;
static void parseHash(char *str) {
hashInit = strtoul(str, &str, 0);
if (*str) hashBound = strtoul(&str[1], NULL, 0);
}
#ifdef __OpenBSD__
static void unveilConfig(const char *name) {
const char *dirs = NULL;
for (const char *path; NULL != (path = configPath(&dirs, name));) {
int error = unveil(path, "r");
if (error && errno != ENOENT) err(EX_NOINPUT, "%s", path);
}
}
static void unveilData(const char *name) {
const char *dirs = NULL;
for (const char *path; NULL != (path = dataPath(&dirs, name));) {
int error = unveil(path, "rwc");
if (error && errno != ENOENT) err(EX_CANTCREAT, "%s", path);
}
}
static void sandbox(const char *trust, const char *cert, const char *priv) {
int error = pledge(
"stdio rpath wpath cpath inet dns tty proc exec unveil", NULL
);
if (error) err(EX_OSERR, "pledge");
if (!self.restricted) return;
dataMkdir("");
unveilData("");
if (trust) unveilConfig(trust);
if (cert) unveilConfig(cert);
if (priv) unveilConfig(priv);
if (save) unveilData(save);
struct {
const char *path;
const char *perm;
} paths[] = {
{ "/usr/bin/man", "x" },
{ "/usr/share/terminfo", "r" },
{ tls_default_ca_cert_file(), "r" },
{ NULL, NULL },
};
for (size_t i = 0; i < ARRAY_LEN(paths); ++i) {
int error = unveil(paths[i].path, paths[i].perm);
if (error) err(EX_OSFILE, "%s", paths[i].path);
}
}
#endif /* __OpenBSD__ */
static volatile sig_atomic_t signals[NSIG];
static void signalHandler(int signal) {
signals[signal] = 1;
}
int main(int argc, char *argv[]) {
setlocale(LC_CTYPE, "");
bool insecure = false;
bool printCert = false;
const char *bind = NULL;
const char *host = NULL;
const char *port = "6697";
const char *trust = NULL;
const char *cert = NULL;
const char *priv = NULL;
bool sasl = false;
const char *pass = NULL;
const char *nick = NULL;
const char *user = NULL;
const char *real = NULL;
struct option options[] = {
{ .val = '!', .name = "insecure", no_argument },
{ .val = 'C', .name = "copy", required_argument },
{ .val = 'H', .name = "hash", required_argument },
{ .val = 'N', .name = "notify", required_argument },
{ .val = 'O', .name = "open", required_argument },
{ .val = 'R', .name = "restrict", no_argument },
{ .val = 'S', .name = "bind", required_argument },
{ .val = 'a', .name = "sasl-plain", required_argument },
{ .val = 'c', .name = "cert", required_argument },
{ .val = 'e', .name = "sasl-external", no_argument },
{ .val = 'g', .name = "generate", required_argument },
{ .val = 'h', .name = "host", required_argument },
{ .val = 'i', .name = "ignore", required_argument },
{ .val = 'j', .name = "join", required_argument },
{ .val = 'k', .name = "priv", required_argument },
{ .val = 'l', .name = "log", no_argument },
{ .val = 'n', .name = "nick", required_argument },
{ .val = 'o', .name = "print-chain", no_argument },
{ .val = 'p', .name = "port", required_argument },
{ .val = 'r', .name = "real", required_argument },
{ .val = 's', .name = "save", required_argument },
{ .val = 't', .name = "trust", required_argument },
{ .val = 'u', .name = "user", required_argument },
{ .val = 'v', .name = "debug", no_argument },
{ .val = 'w', .name = "pass", required_argument },
{0},
};
char opts[2 * ARRAY_LEN(options)];
for (size_t i = 0, j = 0; i < ARRAY_LEN(options); ++i) {
opts[j++] = options[i].val;
if (options[i].has_arg) opts[j++] = ':';
}
for (int opt; 0 < (opt = getopt_config(argc, argv, opts, options, NULL));) {
switch (opt) {
break; case '!': insecure = true;
break; case 'C': utilPush(&urlCopyUtil, optarg);
break; case 'H': parseHash(optarg);
break; case 'N': utilPush(&uiNotifyUtil, optarg);
break; case 'O': utilPush(&urlOpenUtil, optarg);
break; case 'R': self.restricted = true;
break; case 'S': bind = optarg;
break; case 'a': sasl = true; self.plain = optarg;
break; case 'c': cert = optarg;
break; case 'e': sasl = true;
break; case 'g': genCert(optarg);
break; case 'h': host = optarg;
break; case 'i': filterAdd(Ice, optarg);
break; case 'j': self.join = optarg;
break; case 'k': priv = optarg;
break; case 'l': logEnable = true;
break; case 'n': nick = optarg;
break; case 'o': insecure = true; printCert = true;
break; case 'p': port = optarg;
break; case 'r': real = optarg;
break; case 's': save = optarg;
break; case 't': trust = optarg;
break; case 'u': user = optarg;
break; case 'v': self.debug = true;
break; case 'w': pass = optarg;
break; default: return EX_USAGE;
}
}
if (!host) errx(EX_USAGE, "host required");
if (!nick) nick = getenv("USER");
if (!nick) errx(EX_CONFIG, "USER unset");
if (!user) user = nick;
if (!real) real = nick;
// Modes defined in RFC 1459:
set(&network.chanTypes, "#&");
set(&network.prefixes, "@+");
set(&network.prefixModes, "ov");
set(&network.listModes, "b");
set(&network.paramModes, "k");
set(&network.setParamModes, "l");
set(&network.channelModes, "imnpst");
set(&network.name, host);
set(&self.nick, "*");
editCompleteAdd();
commandCompleteAdd();
#ifdef __OpenBSD__
sandbox(trust, cert, priv);
#endif
ircConfig(insecure, trust, cert, priv);
if (printCert) {
ircConnect(bind, host, port);
ircPrintCert();
ircClose();
return EX_OK;
}
uiInitEarly();
if (save) {
uiLoad(save);
atexit(exitSave);
}
uiShowID(Network);
uiFormat(
Network, Cold, NULL,
"\3%dcatgirl\3\tis GPLv3 fwee softwawe ^w^ "
"code is avaiwable fwom https://git.causal.agency/catgirl",
Pink
);
uiFormat(Network, Cold, NULL, "Traveling...");
uiDraw();
int irc = ircConnect(bind, host, port);
if (pass) ircFormat("PASS :%s\r\n", pass);
if (sasl) ircFormat("CAP REQ :sasl\r\n");
ircFormat("CAP LS\r\n");
ircFormat("NICK :%s\r\n", nick);
ircFormat("USER %s 0 * :%s\r\n", user, real);
uiInitLate();
signal(SIGHUP, signalHandler);
signal(SIGINT, signalHandler);
signal(SIGTERM, signalHandler);
signal(SIGCHLD, signalHandler);
sig_t cursesWinch = signal(SIGWINCH, signalHandler);
fcntl(irc, F_SETFD, FD_CLOEXEC);
if (!self.restricted) {
int error = pipe(utilPipe);
if (error) err(EX_OSERR, "pipe");
error = pipe(execPipe);
if (error) err(EX_OSERR, "pipe");
fcntl(utilPipe[0], F_SETFD, FD_CLOEXEC);
fcntl(utilPipe[1], F_SETFD, FD_CLOEXEC);
fcntl(execPipe[0], F_SETFD, FD_CLOEXEC);
fcntl(execPipe[1], F_SETFD, FD_CLOEXEC);
}
struct pollfd fds[] = {
{ .events = POLLIN, .fd = STDIN_FILENO },
{ .events = POLLIN, .fd = irc },
{ .events = POLLIN, .fd = utilPipe[0] },
{ .events = POLLIN, .fd = execPipe[0] },
};
while (!self.quit) {
int nfds = poll(fds, (self.restricted ? 2 : ARRAY_LEN(fds)), -1);
if (nfds < 0 && errno != EINTR) err(EX_IOERR, "poll");
if (nfds > 0) {
if (fds[0].revents) uiRead();
if (fds[1].revents) ircRecv();
if (fds[2].revents) utilRead();
if (fds[3].revents) execRead();
}
if (signals[SIGHUP]) self.quit = "zzz";
if (signals[SIGINT] || signals[SIGTERM]) break;
if (signals[SIGCHLD]) {
signals[SIGCHLD] = 0;
for (int status; 0 < waitpid(-1, &status, WNOHANG);) {
if (WIFEXITED(status) && WEXITSTATUS(status)) {
uiFormat(
Network, Warm, NULL,
"Process exits with status %d", WEXITSTATUS(status)
);
} else if (WIFSIGNALED(status)) {
uiFormat(
Network, Warm, NULL,
"Process terminates from %s",
strsignal(WTERMSIG(status))
);
}
}
uiShow();
}
if (signals[SIGWINCH]) {
signals[SIGWINCH] = 0;
cursesWinch(SIGWINCH);
// XXX: For some reason, calling uiDraw() here is the only way to
// get uiRead() to properly receive KEY_RESIZE.
uiDraw();
uiRead();
}
uiDraw();
}
if (self.quit) {
ircFormat("QUIT :%s\r\n", self.quit);
} else {
ircFormat("QUIT\r\n");
}
struct Message msg = {
.nick = self.nick,
.user = self.user,
.cmd = "QUIT",
.params[0] = self.quit,
};
handle(&msg);
ircClose();
logClose();
uiHide();
}
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