428 lines
12 KiB
C
428 lines
12 KiB
C
/* Copyright (C) 2020 C. McEnroe <june@causal.agency>
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*
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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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*
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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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*
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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 <https://www.gnu.org/licenses/>.
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*
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* Additional permission under GNU GPL version 3 section 7:
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*
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* If you modify this Program, or any covered work, by linking or
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* combining it with OpenSSL (or a modified version of that library),
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* containing parts covered by the terms of the OpenSSL License and the
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* original SSLeay license, the licensors of this Program grant you
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* additional permission to convey the resulting work. Corresponding
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* Source for a non-source form of such a combination shall include the
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* source code for the parts of OpenSSL used as well as that of the
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* covered work.
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*/
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <locale.h>
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#include <poll.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sysexits.h>
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#include <time.h>
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#include <tls.h>
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#include <unistd.h>
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#include "chat.h"
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#ifndef OPENSSL_BIN
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#define OPENSSL_BIN "openssl"
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#endif
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static void genCert(const char *path) {
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const char *name = strrchr(path, '/');
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name = (name ? &name[1] : path);
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char subj[4 + NAME_MAX];
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snprintf(subj, sizeof(subj), "/CN=%.*s", (int)strcspn(name, "."), name);
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umask(0066);
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execlp(
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OPENSSL_BIN, "openssl", "req",
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"-x509", "-new", "-newkey", "rsa:4096", "-sha256", "-days", "3650",
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"-nodes", "-subj", subj, "-out", path, "-keyout", path,
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NULL
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);
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err(EX_UNAVAILABLE, "openssl");
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}
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char *idNames[IDCap] = {
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[None] = "<none>",
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[Debug] = "<debug>",
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[Network] = "<network>",
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};
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enum Color idColors[IDCap] = {
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[None] = Black,
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[Debug] = Green,
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[Network] = Gray,
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};
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uint idNext = Network + 1;
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struct Network network = { .userLen = 9, .hostLen = 63 };
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struct Self self = { .color = Default };
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static const char *save;
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static void exitSave(void) {
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int error = uiSave();
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if (error) {
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warn("%s", save);
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_exit(EX_IOERR);
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}
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}
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uint execID;
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int execPipe[2] = { -1, -1 };
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int utilPipe[2] = { -1, -1 };
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static void execRead(void) {
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char buf[1024];
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ssize_t len = read(execPipe[0], buf, sizeof(buf) - 1);
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if (len < 0) err(EX_IOERR, "read");
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if (!len) return;
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buf[len] = '\0';
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for (char *ptr = buf; ptr;) {
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char *line = strsep(&ptr, "\r\n");
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if (line[0]) command(execID, line);
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}
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}
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static void utilRead(void) {
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char buf[1024];
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ssize_t len = read(utilPipe[0], buf, sizeof(buf) - 1);
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if (len < 0) err(EX_IOERR, "read");
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if (!len) return;
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buf[len] = '\0';
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for (char *ptr = buf; ptr;) {
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char *line = strsep(&ptr, "\r\n");
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if (line[0]) uiFormat(Network, Warm, NULL, "%s", line);
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}
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}
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uint32_t hashInit;
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uint32_t hashBound = 75;
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static void parseHash(char *str) {
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hashInit = strtoul(str, &str, 0);
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if (*str) hashBound = strtoul(&str[1], NULL, 0);
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}
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static volatile sig_atomic_t signals[NSIG];
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static void signalHandler(int signal) {
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signals[signal] = 1;
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}
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int main(int argc, char *argv[]) {
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setlocale(LC_CTYPE, "");
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bool insecure = false;
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bool printCert = false;
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const char *bind = NULL;
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const char *host = NULL;
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const char *port = "6697";
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const char *trust = NULL;
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const char *cert = NULL;
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const char *priv = NULL;
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bool sasl = false;
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const char *pass = NULL;
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const char *nick = NULL;
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const char *user = NULL;
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const char *real = NULL;
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struct option options[] = {
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{ .val = '!', .name = "insecure", no_argument },
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{ .val = 'C', .name = "copy", required_argument },
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{ .val = 'H', .name = "hash", required_argument },
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{ .val = 'I', .name = "highlight", required_argument },
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{ .val = 'K', .name = "kiosk", no_argument },
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{ .val = 'N', .name = "notify", required_argument },
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{ .val = 'O', .name = "open", required_argument },
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{ .val = 'R', .name = "restrict", no_argument },
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{ .val = 'S', .name = "bind", required_argument },
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{ .val = 'T', .name = "timestamp", optional_argument },
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{ .val = 'a', .name = "sasl-plain", required_argument },
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{ .val = 'c', .name = "cert", required_argument },
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{ .val = 'e', .name = "sasl-external", no_argument },
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{ .val = 'g', .name = "generate", required_argument },
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{ .val = 'h', .name = "host", required_argument },
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{ .val = 'i', .name = "ignore", required_argument },
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{ .val = 'j', .name = "join", required_argument },
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{ .val = 'k', .name = "priv", required_argument },
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{ .val = 'l', .name = "log", no_argument },
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{ .val = 'm', .name = "mode", required_argument },
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{ .val = 'n', .name = "nick", required_argument },
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{ .val = 'o', .name = "print-chain", no_argument },
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{ .val = 'p', .name = "port", required_argument },
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{ .val = 'r', .name = "real", required_argument },
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{ .val = 's', .name = "save", required_argument },
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{ .val = 't', .name = "trust", required_argument },
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{ .val = 'u', .name = "user", required_argument },
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{ .val = 'v', .name = "debug", no_argument },
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{ .val = 'w', .name = "pass", required_argument },
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{0},
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};
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char opts[3 * ARRAY_LEN(options)];
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for (size_t i = 0, j = 0; i < ARRAY_LEN(options); ++i) {
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opts[j++] = options[i].val;
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if (options[i].has_arg != no_argument) opts[j++] = ':';
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if (options[i].has_arg == optional_argument) opts[j++] = ':';
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}
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for (int opt; 0 < (opt = getopt_config(argc, argv, opts, options, NULL));) {
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switch (opt) {
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break; case '!': insecure = true;
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break; case 'C': utilPush(&urlCopyUtil, optarg);
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break; case 'H': parseHash(optarg);
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break; case 'I': filterAdd(Hot, optarg);
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break; case 'K': self.kiosk = true;
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break; case 'N': utilPush(&uiNotifyUtil, optarg);
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break; case 'O': utilPush(&urlOpenUtil, optarg);
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break; case 'R': self.restricted = true;
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break; case 'S': bind = optarg;
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break; case 'T': {
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uiTime.enable = true;
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if (optarg) uiTime.format = optarg;
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}
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break; case 'a': sasl = true; self.plain = optarg;
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break; case 'c': cert = optarg;
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break; case 'e': sasl = true;
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break; case 'g': genCert(optarg);
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break; case 'h': host = optarg;
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break; case 'i': filterAdd(Ice, optarg);
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break; case 'j': self.join = optarg;
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break; case 'k': priv = optarg;
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break; case 'l': logEnable = true;
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break; case 'm': self.mode = optarg;
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break; case 'n': nick = optarg;
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break; case 'o': insecure = true; printCert = true;
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break; case 'p': port = optarg;
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break; case 'r': real = optarg;
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break; case 's': save = optarg;
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break; case 't': trust = optarg;
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break; case 'u': user = optarg;
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break; case 'v': self.debug = true;
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break; case 'w': pass = optarg;
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break; default: return EX_USAGE;
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}
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}
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if (!host) errx(EX_USAGE, "host required");
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if (printCert) {
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ircConfig(insecure, trust, cert, priv);
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#ifdef __OpenBSD__
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int error = pledge("stdio inet dns", NULL);
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if (error) err(EX_OSERR, "pledge");
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#endif
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ircConnect(bind, host, port);
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ircPrintCert();
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ircClose();
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return EX_OK;
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}
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if (!nick) nick = getenv("USER");
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if (!nick) errx(EX_CONFIG, "USER unset");
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if (!user) user = nick;
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if (!real) real = nick;
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if (self.kiosk) {
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char *hash;
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int n = asprintf(&hash, "%08" PRIx32, _hash(user));
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if (n < 0) err(EX_OSERR, "asprintf");
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user = hash;
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}
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// Modes defined in RFC 1459:
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set(&network.chanTypes, "#&");
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set(&network.prefixes, "@+");
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set(&network.prefixModes, "ov");
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set(&network.listModes, "b");
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set(&network.paramModes, "k");
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set(&network.setParamModes, "l");
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set(&network.channelModes, "imnpst");
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set(&network.name, host);
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set(&self.nick, "*");
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editCompleteAdd();
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commandCompleteAdd();
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ircConfig(insecure, trust, cert, priv);
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uiInitEarly();
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if (save) {
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uiLoad(save);
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atexit(exitSave);
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}
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#ifdef __OpenBSD__
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if (self.restricted && logEnable) {
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const char *logdir = dataMkdir("");
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int error = unveil(logdir, "wc");
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if (error) err(EX_OSERR, "unveil");
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}
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char promises[64] = "stdio tty";
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char *ptr = &promises[strlen(promises)], *end = &promises[sizeof(promises)];
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if (logEnable) ptr = seprintf(ptr, end, " wpath cpath");
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if (!self.restricted) ptr = seprintf(ptr, end, " proc exec");
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char *promisesInitial = ptr;
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ptr = seprintf(ptr, end, " inet dns");
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int error = pledge(promises, NULL);
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if (error) err(EX_OSERR, "pledge");
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#endif
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uiShowID(Network);
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uiFormat(
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Network, Cold, NULL,
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"\3%dcatgirl\3\tis GPLv3 fwee softwawe ^w^ "
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"code is avaiwable fwom https://git.causal.agency/catgirl",
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Pink
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);
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uiFormat(Network, Cold, NULL, "Traveling...");
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uiDraw();
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int irc = ircConnect(bind, host, port);
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#ifdef __OpenBSD__
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*promisesInitial = '\0';
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error = pledge(promises, NULL);
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if (error) err(EX_OSERR, "pledge");
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#endif
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if (pass) ircFormat("PASS :%s\r\n", pass);
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if (sasl) ircFormat("CAP REQ :sasl\r\n");
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ircFormat("CAP LS\r\n");
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ircFormat("NICK :%s\r\n", nick);
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ircFormat("USER %s 0 * :%s\r\n", user, real);
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uiInitLate();
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signal(SIGHUP, signalHandler);
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signal(SIGINT, signalHandler);
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signal(SIGALRM, signalHandler);
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signal(SIGTERM, signalHandler);
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signal(SIGCHLD, signalHandler);
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sig_t cursesWinch = signal(SIGWINCH, signalHandler);
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fcntl(irc, F_SETFD, FD_CLOEXEC);
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bool pipes = !self.kiosk && !self.restricted;
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if (pipes) {
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int error = pipe(utilPipe) || pipe(execPipe);
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if (error) err(EX_OSERR, "pipe");
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fcntl(utilPipe[0], F_SETFD, FD_CLOEXEC);
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fcntl(utilPipe[1], F_SETFD, FD_CLOEXEC);
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fcntl(execPipe[0], F_SETFD, FD_CLOEXEC);
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fcntl(execPipe[1], F_SETFD, FD_CLOEXEC);
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}
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bool ping = false;
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struct pollfd fds[] = {
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{ .events = POLLIN, .fd = STDIN_FILENO },
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{ .events = POLLIN, .fd = irc },
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{ .events = POLLIN, .fd = utilPipe[0] },
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{ .events = POLLIN, .fd = execPipe[0] },
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};
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while (!self.quit) {
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int nfds = poll(fds, (pipes ? ARRAY_LEN(fds) : 2), -1);
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if (nfds < 0 && errno != EINTR) err(EX_IOERR, "poll");
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if (nfds > 0) {
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if (fds[0].revents) uiRead();
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if (fds[1].revents) ircRecv();
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if (fds[2].revents) utilRead();
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if (fds[3].revents) execRead();
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}
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if (signals[SIGHUP]) self.quit = "zzz";
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if (signals[SIGINT] || signals[SIGTERM]) break;
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if (nfds > 0 && fds[1].revents) {
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ping = false;
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struct itimerval timer = {
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.it_value.tv_sec = 2 * 60,
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.it_interval.tv_sec = 30,
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};
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int error = setitimer(ITIMER_REAL, &timer, NULL);
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if (error) err(EX_OSERR, "setitimer");
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}
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if (signals[SIGALRM]) {
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signals[SIGALRM] = 0;
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if (ping) {
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errx(EX_UNAVAILABLE, "ping timeout");
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} else {
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ircFormat("PING nyaa\r\n");
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ping = true;
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}
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}
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if (signals[SIGCHLD]) {
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signals[SIGCHLD] = 0;
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for (int status; 0 < waitpid(-1, &status, WNOHANG);) {
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if (WIFEXITED(status) && WEXITSTATUS(status)) {
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uiFormat(
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Network, Warm, NULL,
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"Process exits with status %d", WEXITSTATUS(status)
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);
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} else if (WIFSIGNALED(status)) {
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uiFormat(
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Network, Warm, NULL,
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"Process terminates from %s",
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strsignal(WTERMSIG(status))
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);
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}
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}
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uiShow();
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}
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if (signals[SIGWINCH]) {
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signals[SIGWINCH] = 0;
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cursesWinch(SIGWINCH);
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// XXX: For some reason, calling uiDraw() here is the only way to
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// get uiRead() to properly receive KEY_RESIZE.
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uiDraw();
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uiRead();
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}
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uiDraw();
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}
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if (self.quit) {
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ircFormat("QUIT :%s\r\n", self.quit);
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} else {
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ircFormat("QUIT\r\n");
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}
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struct Message msg = {
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.nick = self.nick,
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.user = self.user,
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.cmd = "QUIT",
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.params[0] = self.quit,
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};
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handle(&msg);
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ircClose();
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logClose();
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uiHide();
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}
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