/* Copyright (C) 2021 C. McEnroe * * 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 . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void request(int sock, char *argv[]) { struct pollfd pfd = { .fd = sock, .events = POLLIN }; int nfds = poll(&pfd, 1, -1); if (nfds < 0) err(EX_OSERR, "poll"); char buf[4096]; ssize_t len = recv(sock, buf, sizeof(buf)-1, MSG_PEEK); if (len < 0) { warn("recv"); return; } char *blank = memmem(buf, len, "\r\n\r\n", 4); if (!blank) { warnx("can't find end of request headers in peek"); return; } len = recv(sock, buf, &blank[4] - buf, 0); if (len < 0) { warn("recv"); return; } buf[len] = '\0'; char *ptr = buf; char *req = strsep(&ptr, "\r\n"); char *method = strsep(&req, " "); char *query = strsep(&req, " "); char *path = strsep(&query, "?"); char *proto = strsep(&req, " "); if (!method || !path || !proto) { warnx("invalid request line"); return; } setenv("REQUEST_METHOD", method, 1); setenv("PATH_INFO", path, 1); setenv("QUERY_STRING", (query ? query : ""), 1); setenv("SERVER_PROTOCOL", proto, 1); unsetenv("CONTENT_TYPE"); unsetenv("CONTENT_LENGTH"); unsetenv("HTTP_HOST"); while (ptr) { char *value = strsep(&ptr, "\r\n"); if (!value[0]) continue; char *header = strsep(&value, ":"); if (!header || !value++) { warnx("invalid header"); return; } if (!strcasecmp(header, "Content-Type")) { setenv("CONTENT_TYPE", value, 1); } else if (!strcasecmp(header, "Content-Length")) { setenv("CONTENT_LENGTH", value, 1); } else if (!strcasecmp(header, "Host")) { setenv("HTTP_HOST", value, 1); } } dprintf(sock, "HTTP/1.1 200 OK\nConnection: close\n"); pid_t pid = fork(); if (pid < 0) err(EX_OSERR, "fork"); if (!pid) { dup2(sock, STDIN_FILENO); dup2(sock, STDOUT_FILENO); execv(argv[0], argv); warn("%s", argv[0]); _exit(127); } int status; pid = wait(&status); if (pid < 0) err(EX_OSERR, "wait"); if (WIFEXITED(status) && WEXITSTATUS(status)) { warnx("%s exited %d", argv[0], WEXITSTATUS(status)); } else if (WIFSIGNALED(status)) { warnx("%s killed %d", argv[0], WTERMSIG(status)); } } int main(int argc, char *argv[]) { short port = 0; for (int opt; 0 < (opt = getopt(argc, argv, "p:"));) { switch (opt) { break; case 'p': port = atoi(optarg); break; default: return EX_USAGE; } } if (optind == argc) errx(EX_USAGE, "script required"); int server = socket(AF_INET, SOCK_STREAM, 0); if (server < 0) err(EX_OSERR, "socket"); fcntl(server, F_SETFD, FD_CLOEXEC); struct sockaddr_in addr = { .sin_family = AF_INET, .sin_port = htons(port), .sin_addr.s_addr = htonl(INADDR_LOOPBACK), }; socklen_t addrlen = sizeof(addr); int error = 0 || bind(server, (struct sockaddr *)&addr, addrlen) || getsockname(server, (struct sockaddr *)&addr, &addrlen) || listen(server, -1); if (error) err(EX_UNAVAILABLE, "%hd", port); char host[NI_MAXHOST], serv[NI_MAXSERV]; error = getnameinfo( (struct sockaddr *)&addr, addrlen, host, sizeof(host), serv, sizeof(serv), NI_NOFQDN | NI_NUMERICSERV ); if (error) errx(EX_UNAVAILABLE, "getnameinfo: %s", gai_strerror(error)); printf("http://%s:%s/\n", host, serv); fflush(stdout); setenv("SERVER_SOFTWARE", "quick (and dirty)", 1); setenv("GATEWAY_INTERFACE", "CGI/1.1", 1); setenv("SERVER_NAME", host, 1); setenv("SERVER_PORT", serv, 1); setenv("REMOTE_ADDR", "127.0.0.1", 1); setenv("REMOTE_HOST", host, 1); setenv("SCRIPT_NAME", "/", 1); for (int sock; 0 <= (sock = accept(server, NULL, NULL)); close(sock)) { fcntl(sock, F_SETFD, FD_CLOEXEC); request(sock, &argv[optind]); } err(EX_IOERR, "accept"); }