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Diffstat (limited to '')
| -rw-r--r-- | linger.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/linger.c b/linger.c new file mode 100644 index 0000000..960886d --- /dev/null +++ b/linger.c @@ -0,0 +1,154 @@ +/* Copyright (C) 2019 C. McEnroe <june@causal.agency> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero 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 Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <err.h> +#include <limits.h> +#include <netdb.h> +#include <netinet/in.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/socket.h> +#include <sysexits.h> +#include <tls.h> +#include <unistd.h> + +#ifndef DEFAULT_CERT_PATH +#define DEFAULT_CERT_PATH "/usr/local/etc/letsencrypt/live/%s/fullchain.pem" +#endif + +#ifndef DEFAULT_PRIV_PATH +#define DEFAULT_PRIV_PATH "/usr/local/etc/letsencrypt/live/%s/privkey.pem" +#endif + +static char *censor(char *arg) { + char *dup = strdup(arg); + if (!dup) err(EX_OSERR, "strdup"); + memset(arg, '*', strlen(dup)); + return dup; +} + +int main(int argc, char *argv[]) { + const char *localHost = "localhost"; + const char *localPort = "6697"; + const char *localPass = NULL; + char certPath[PATH_MAX] = ""; + char privPath[PATH_MAX] = ""; + + const char *host = NULL; + const char *port = "6697"; + const char *pass = NULL; + const char *auth = NULL; + const char *nick = NULL; + const char *user = NULL; + const char *real = NULL; + const char *join = NULL; + + int opt; + while (0 < (opt = getopt(argc, argv, "C:H:K:P:W:a:h:j:n:p:r:u:w:"))) { + switch (opt) { + break; case 'C': strlcpy(certPath, optarg, sizeof(certPath)); + break; case 'H': localHost = optarg; + break; case 'K': strlcpy(privPath, optarg, sizeof(privPath)); + break; case 'P': localPort = optarg; + break; case 'W': localPass = censor(optarg); + break; case 'a': auth = censor(optarg); + break; case 'h': host = optarg; + break; case 'j': join = optarg; + break; case 'n': nick = optarg; + break; case 'p': port = optarg; + break; case 'r': real = optarg; + break; case 'u': user = optarg; + break; case 'w': pass = censor(optarg); + break; default: return EX_USAGE; + } + } + + if (!certPath[0]) { + snprintf(certPath, sizeof(certPath), DEFAULT_CERT_PATH, localHost); + } + if (!privPath[0]) { + snprintf(privPath, sizeof(privPath), DEFAULT_PRIV_PATH, localHost); + } + + if (!host) errx(EX_USAGE, "no host"); + if (!nick) { + nick = getenv("USER"); + if (!nick) errx(EX_CONFIG, "USER unset"); + } + if (!user) user = nick; + if (!real) real = nick; + + int error; + + struct tls_config *config = tls_config_new(); + if (!config) errx(EX_SOFTWARE, "tls_config_new"); + + error = tls_config_set_keypair_file(config, certPath, privPath); + if (error) { + errx( + EX_CONFIG, "tls_config_set_keypair_file: %s", + tls_config_error(config) + ); + } + + struct tls *server = tls_server(); + if (!server) errx(EX_SOFTWARE, "tls_server"); + + error = tls_configure(server, config); + if (error) errx(EX_SOFTWARE, "tls_configure: %s", tls_error(server)); + tls_config_free(config); + + struct addrinfo *head; + struct addrinfo hints = { + .ai_family = AF_UNSPEC, + .ai_socktype = SOCK_STREAM, + .ai_protocol = IPPROTO_TCP, + }; + error = getaddrinfo(localHost, localPort, &hints, &head); + if (error) errx(EX_NOHOST, "getaddrinfo: %s", gai_strerror(error)); + + int sock = -1; + for (struct addrinfo *ai = head; ai; ai = ai->ai_next) { + sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); + if (sock < 0) err(EX_OSERR, "socket"); + + error = bind(sock, ai->ai_addr, ai->ai_addrlen); + if (!error) break; + + close(sock); + sock = -1; + } + if (sock < 0) err(EX_UNAVAILABLE, "bind"); + freeaddrinfo(head); + + error = listen(sock, 1); + if (error) err(EX_IOERR, "listen"); + + int client = accept(sock, NULL, NULL); + if (client < 0) err(EX_IOERR, "accept"); + + struct tls *tls; + error = tls_accept_socket(server, &tls, client); + if (error) errx(EX_SOFTWARE, "tls_accept_socket: %s", tls_error(server)); + + char buf[4096]; + ssize_t len = tls_read(tls, buf, sizeof(buf)); + if (len < 0) errx(EX_IOERR, "tls_read: %s", tls_error(tls)); + + buf[len] = '\0'; + printf("%s", buf); +} |