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Initial commit of twind - a small and simple gemini daemon
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  1 f224a3fe 2021-08-24 xhr /*

  2 f224a3fe 2021-08-24 xhr  * Copyright (c) 2021 Matthias Schmidt <xhr@giessen.ccc.de>

  3 f224a3fe 2021-08-24 xhr  *

  4 f224a3fe 2021-08-24 xhr  * Permission to use, copy, modify, and distribute this software for any

  5 f224a3fe 2021-08-24 xhr  * purpose with or without fee is hereby granted, provided that the above

  6 f224a3fe 2021-08-24 xhr  * copyright notice and this permission notice appear in all copies.

  7 f224a3fe 2021-08-24 xhr  *

  8 f224a3fe 2021-08-24 xhr  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

  9 f224a3fe 2021-08-24 xhr  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 10 f224a3fe 2021-08-24 xhr  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 11 f224a3fe 2021-08-24 xhr  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 12 f224a3fe 2021-08-24 xhr  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 13 f224a3fe 2021-08-24 xhr  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 14 f224a3fe 2021-08-24 xhr  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 15 f224a3fe 2021-08-24 xhr  */

 16 f224a3fe 2021-08-24 xhr 

 17 f224a3fe 2021-08-24 xhr #include <sys/socket.h>

 18 f224a3fe 2021-08-24 xhr #include <sys/stat.h>

 19 f224a3fe 2021-08-24 xhr 

 20 f224a3fe 2021-08-24 xhr #include <err.h>

 21 f224a3fe 2021-08-24 xhr #include <errno.h>

 22 f224a3fe 2021-08-24 xhr #include <fcntl.h>

 23 f224a3fe 2021-08-24 xhr #include <stdio.h>

 24 f224a3fe 2021-08-24 xhr #include <string.h>

 25 f224a3fe 2021-08-24 xhr #include <unistd.h>

 26 f224a3fe 2021-08-24 xhr 

 27 f224a3fe 2021-08-24 xhr #include "log.h"

 28 f224a3fe 2021-08-24 xhr #include "twind.h"

 29 f224a3fe 2021-08-24 xhr 

 30 f224a3fe 2021-08-24 xhr static void

 31 f224a3fe 2021-08-24 xhr generate_meta(int status_code, char *meta_response_string, const char *mime)

 32 f224a3fe 2021-08-24 xhr {

 33 f224a3fe 2021-08-24 xhr 	switch(status_code) {

 34 f224a3fe 2021-08-24 xhr 		case STATUS_INPUT:

 35 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Present input\r\n", status_code);

 36 f224a3fe 2021-08-24 xhr 			break;

 37 f224a3fe 2021-08-24 xhr 		case STATUS_SENSITIVE_INPUT:

 38 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Present sensitive input\r\n",

 39 f224a3fe 2021-08-24 xhr 				status_code);

 40 f224a3fe 2021-08-24 xhr 			break;

 41 f224a3fe 2021-08-24 xhr 		case STATUS_SUCCESS:

 42 f224a3fe 2021-08-24 xhr 			if (mime == NULL)

 43 f224a3fe 2021-08-24 xhr 				/* Could not deducte mime type, so send text/gemini as default */

 44 f224a3fe 2021-08-24 xhr 				snprintf(meta_response_string, 1024, "%d text/gemini\r\n", status_code);

 45 f224a3fe 2021-08-24 xhr 			else

 46 f224a3fe 2021-08-24 xhr 				snprintf(meta_response_string, 1024, "%d %s\r\n", status_code, mime);

 47 f224a3fe 2021-08-24 xhr 			break;

 48 f224a3fe 2021-08-24 xhr 		case STATUS_REDIRECT_TEMP:

 49 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Temporary redirect\r\n",

 50 f224a3fe 2021-08-24 xhr 				status_code);

 51 f224a3fe 2021-08-24 xhr 			break;

 52 f224a3fe 2021-08-24 xhr 		case STATUS_REDIRECT_PERM:

 53 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Permanent redirect\r\n",

 54 f224a3fe 2021-08-24 xhr 				status_code);

 55 f224a3fe 2021-08-24 xhr 			break;

 56 f224a3fe 2021-08-24 xhr 		case STATUS_TEMP_UNAVAILABLE:

 57 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Temporary failure\r\n",

 58 f224a3fe 2021-08-24 xhr 				status_code);

 59 f224a3fe 2021-08-24 xhr 			break;

 60 f224a3fe 2021-08-24 xhr 		case STATUS_SERVER_UNAVAILABLE:

 61 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Server unavailable\r\n",

 62 f224a3fe 2021-08-24 xhr 				status_code);

 63 f224a3fe 2021-08-24 xhr 			break;

 64 f224a3fe 2021-08-24 xhr 		case STATUS_CGI_ERROR:

 65 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d CGI Error\r\n", status_code);

 66 f224a3fe 2021-08-24 xhr 			break;

 67 f224a3fe 2021-08-24 xhr 		case STATUS_PROXY_ERROR:

 68 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Proxy error\r\n", status_code);

 69 f224a3fe 2021-08-24 xhr 			break;

 70 f224a3fe 2021-08-24 xhr 		case STATUS_SLOW_DOWN:

 71 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Slow down\r\n", status_code);

 72 f224a3fe 2021-08-24 xhr 			break;

 73 f224a3fe 2021-08-24 xhr 		case STATUS_PERM_FAILURE:

 74 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Permanent failure\r\n", status_code);

 75 f224a3fe 2021-08-24 xhr 			break;

 76 f224a3fe 2021-08-24 xhr 		case STATUS_NOT_FOUND:

 77 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Resource not found\r\n",

 78 f224a3fe 2021-08-24 xhr 				status_code);

 79 f224a3fe 2021-08-24 xhr 			break;

 80 f224a3fe 2021-08-24 xhr 		case STATUS_GONE:

 81 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Resource is gone\r\n", status_code);

 82 f224a3fe 2021-08-24 xhr 			break;

 83 f224a3fe 2021-08-24 xhr 		case STATUS_PROXY_REQUEST_REFUSED:

 84 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Proxy request refused\r\n",

 85 f224a3fe 2021-08-24 xhr 				status_code);

 86 f224a3fe 2021-08-24 xhr 			break;

 87 f224a3fe 2021-08-24 xhr 		case STATUS_BAD_REQUEST:

 88 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Bad Request\r\n", status_code);

 89 f224a3fe 2021-08-24 xhr 			break;

 90 f224a3fe 2021-08-24 xhr 		case STATUS_CLIENT_CERT_REQUIRED:

 91 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Client Certificate Required\r\n",

 92 f224a3fe 2021-08-24 xhr 				status_code);

 93 f224a3fe 2021-08-24 xhr 			break;

 94 f224a3fe 2021-08-24 xhr 		case STATUS_CERT_NOT_AUTHORIZED:

 95 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Certificate not authorized\r\n",

 96 f224a3fe 2021-08-24 xhr 				status_code);

 97 f224a3fe 2021-08-24 xhr 			break;

 98 f224a3fe 2021-08-24 xhr 		case STATUS_CERT_NOT_VALID:

 99 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Certificate not valid\r\n",

100 f224a3fe 2021-08-24 xhr 				status_code);

101 f224a3fe 2021-08-24 xhr 			break;

102 f224a3fe 2021-08-24 xhr 		default:

103 f224a3fe 2021-08-24 xhr 			snprintf(meta_response_string, 1024, "%d Unkown status code\r\n",

104 f224a3fe 2021-08-24 xhr 				status_code);

105 f224a3fe 2021-08-24 xhr 			break;

106 f224a3fe 2021-08-24 xhr 	}

107 f224a3fe 2021-08-24 xhr }

108 f224a3fe 2021-08-24 xhr 

109 f224a3fe 2021-08-24 xhr int

110 f224a3fe 2021-08-24 xhr send_non_success_response(SSL *ssl_peer, int status_code)

111 f224a3fe 2021-08-24 xhr {

112 f224a3fe 2021-08-24 xhr 	char meta[1024];

113 f224a3fe 2021-08-24 xhr 

114 f224a3fe 2021-08-24 xhr 	memset(meta, 0, sizeof(meta));

115 f224a3fe 2021-08-24 xhr 

116 f224a3fe 2021-08-24 xhr 	generate_meta(status_code, meta, NULL);

117 f224a3fe 2021-08-24 xhr 

118 f224a3fe 2021-08-24 xhr 	log_debug("Send non success response to client: %d", status_code);

119 f224a3fe 2021-08-24 xhr 

120 f224a3fe 2021-08-24 xhr 	if (SSL_write(ssl_peer, meta, strlen(meta)) <= 0) {

121 f224a3fe 2021-08-24 xhr 		log_warn("Could not send response to client");

122 f224a3fe 2021-08-24 xhr 		return -1;

123 f224a3fe 2021-08-24 xhr 	}

124 f224a3fe 2021-08-24 xhr 

125 f224a3fe 2021-08-24 xhr 	return 0;

126 f224a3fe 2021-08-24 xhr }

127 f224a3fe 2021-08-24 xhr 

128 f224a3fe 2021-08-24 xhr int

129 f224a3fe 2021-08-24 xhr send_response(SSL *ssl_peer, int status_code, const char *gemini_file_path,

130 f224a3fe 2021-08-24 xhr 	const char *mime)

131 f224a3fe 2021-08-24 xhr {

132 f224a3fe 2021-08-24 xhr 	char meta[1024];

133 f224a3fe 2021-08-24 xhr 	char buffer[1024];

134 f224a3fe 2021-08-24 xhr 	int fd = -1, len;

135 f224a3fe 2021-08-24 xhr 

136 f224a3fe 2021-08-24 xhr 	// <STATUS><SPACE><META><CR><LF>

137 f224a3fe 2021-08-24 xhr 

138 f224a3fe 2021-08-24 xhr 	memset(meta, 0, sizeof(meta));

139 f224a3fe 2021-08-24 xhr 	memset(buffer, 0, sizeof(buffer));

140 f224a3fe 2021-08-24 xhr 

141 f224a3fe 2021-08-24 xhr 	generate_meta(status_code, meta, mime);

142 f224a3fe 2021-08-24 xhr 

143 f224a3fe 2021-08-24 xhr 	if (SSL_write(ssl_peer, meta, strlen(meta)) <= 0) {

144 f224a3fe 2021-08-24 xhr 		log_warn("Could not send response to client");

145 f224a3fe 2021-08-24 xhr 		return -1;

146 f224a3fe 2021-08-24 xhr 	}

147 f224a3fe 2021-08-24 xhr 

148 f224a3fe 2021-08-24 xhr 	/* Close connection and do not send a response if status code is not

149 f224a3fe 2021-08-24 xhr 	 * a SUCCESS code

150 f224a3fe 2021-08-24 xhr 	 */

151 f224a3fe 2021-08-24 xhr 	if (status_code < 30 && status_code >= 20) {

152 f224a3fe 2021-08-24 xhr 		fd = open(gemini_file_path, O_RDONLY);

153 f224a3fe 2021-08-24 xhr 		if (fd == -1) {

154 f224a3fe 2021-08-24 xhr 			log_warn("Cannot open requested file");

155 f224a3fe 2021-08-24 xhr 			goto out;

156 f224a3fe 2021-08-24 xhr 		}

157 f224a3fe 2021-08-24 xhr 

158 f224a3fe 2021-08-24 xhr 		while ((len = read(fd, buffer, sizeof(buffer)-1)) > 0) {

159 f224a3fe 2021-08-24 xhr 			if (SSL_write(ssl_peer, buffer, len) <= 0) {

160 f224a3fe 2021-08-24 xhr 				log_warn("Could not send response to client");

161 f224a3fe 2021-08-24 xhr 				return -1;

162 f224a3fe 2021-08-24 xhr 			}

163 f224a3fe 2021-08-24 xhr 		}

164 f224a3fe 2021-08-24 xhr 	}

165 f224a3fe 2021-08-24 xhr 

166 f224a3fe 2021-08-24 xhr out:

167 f224a3fe 2021-08-24 xhr 	close(fd);

168 f224a3fe 2021-08-24 xhr 

169 f224a3fe 2021-08-24 xhr 	return 0;

170 f224a3fe 2021-08-24 xhr }

171 f224a3fe 2021-08-24 xhr 

172 f224a3fe 2021-08-24 xhr int

173 f224a3fe 2021-08-24 xhr check_gemini_file(const char *gemini_file_path)

174 f224a3fe 2021-08-24 xhr {

175 f224a3fe 2021-08-24 xhr 	struct stat sb;

176 f224a3fe 2021-08-24 xhr 

177 f224a3fe 2021-08-24 xhr 	if (stat(gemini_file_path, &sb) == -1) {

178 f224a3fe 2021-08-24 xhr 		log_warn("Cannot open requested file");

179 f224a3fe 2021-08-24 xhr 		return -1;

180 f224a3fe 2021-08-24 xhr 	}

181 f224a3fe 2021-08-24 xhr 

182 f224a3fe 2021-08-24 xhr 	if ((sb.st_mode & (S_IRUSR | S_IRGRP | S_IROTH)) == 0) {

183 f224a3fe 2021-08-24 xhr 		log_warn("Cannot read requested file");

184 f224a3fe 2021-08-24 xhr 		return -1;

185 f224a3fe 2021-08-24 xhr 	}

186 f224a3fe 2021-08-24 xhr 

187 f224a3fe 2021-08-24 xhr 	if ((sb.st_mode & S_IFMT) == S_IFDIR)

188 f224a3fe 2021-08-24 xhr 		return 1;

189 f224a3fe 2021-08-24 xhr 

190 f224a3fe 2021-08-24 xhr 	return 0;

191 f224a3fe 2021-08-24 xhr }