1 /* $OpenBSD: parser.c,v 1.20 2007/12/20 20:15:43 reyk Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Pierre-Yves Ritschard <pyr@openbsd.org> 5 * Copyright (c) 2004 Esben Norby <norby@openbsd.org> 6 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include <sys/types.h> 22 #include <sys/socket.h> 23 #include <sys/queue.h> 24 25 #include <net/if.h> 26 #include <netinet/in.h> 27 #include <arpa/inet.h> 28 29 #include <err.h> 30 #include <errno.h> 31 #include <limits.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <event.h> 36 37 #include <openssl/ssl.h> 38 39 #include "relayd.h" 40 41 #include "parser.h" 42 43 enum token_type { 44 NOTOKEN, 45 ENDTOKEN, 46 HOSTID, 47 TABLEID, 48 RDRID, 49 KEYWORD 50 }; 51 52 struct token { 53 enum token_type type; 54 const char *keyword; 55 int value; 56 const struct token *next; 57 }; 58 59 static const struct token t_main[]; 60 static const struct token t_show[]; 61 static const struct token t_rdr[]; 62 static const struct token t_table[]; 63 static const struct token t_host[]; 64 static const struct token t_rdr_id[]; 65 static const struct token t_table_id[]; 66 static const struct token t_host_id[]; 67 68 static const struct token t_main[] = { 69 {KEYWORD, "monitor", MONITOR, NULL}, 70 {KEYWORD, "show", NONE, t_show}, 71 {KEYWORD, "poll", POLL, NULL}, 72 {KEYWORD, "reload", RELOAD, NULL}, 73 {KEYWORD, "stop", SHUTDOWN, NULL}, 74 {KEYWORD, "redirect", NONE, t_rdr}, 75 {KEYWORD, "table", NONE, t_table}, 76 {KEYWORD, "host", NONE, t_host}, 77 {ENDTOKEN, "", NONE, NULL} 78 }; 79 80 static const struct token t_show[] = { 81 {KEYWORD, "summary", SHOW_SUM, NULL}, 82 {KEYWORD, "hosts", SHOW_HOSTS, NULL}, 83 {KEYWORD, "redirects", SHOW_RDRS, NULL}, 84 {KEYWORD, "relays", SHOW_RELAYS, NULL}, 85 {KEYWORD, "sessions", SHOW_SESSIONS, NULL}, 86 {ENDTOKEN, "", NONE, NULL} 87 }; 88 89 static const struct token t_rdr[] = { 90 {NOTOKEN, "", NONE, NULL}, 91 {KEYWORD, "disable", RDR_DISABLE, t_rdr_id}, 92 {KEYWORD, "enable", RDR_ENABLE, t_rdr_id}, 93 {ENDTOKEN, "", NONE, NULL} 94 }; 95 96 static const struct token t_table[] = { 97 {NOTOKEN, "", NONE, NULL}, 98 {KEYWORD, "disable", TABLE_DISABLE, t_table_id}, 99 {KEYWORD, "enable", TABLE_ENABLE, t_table_id}, 100 {ENDTOKEN, "", NONE, NULL} 101 }; 102 103 static const struct token t_host[] = { 104 {NOTOKEN, "", NONE, NULL}, 105 {KEYWORD, "disable", HOST_DISABLE, t_host_id}, 106 {KEYWORD, "enable", HOST_ENABLE, t_host_id}, 107 {ENDTOKEN, "", NONE, NULL} 108 }; 109 110 static const struct token t_rdr_id[] = { 111 {RDRID, "", NONE, NULL}, 112 {ENDTOKEN, "", NONE, NULL} 113 }; 114 115 static const struct token t_table_id[] = { 116 {TABLEID, "", NONE, NULL}, 117 {ENDTOKEN, "", NONE, NULL} 118 }; 119 120 static const struct token t_host_id[] = { 121 {HOSTID, "", NONE, NULL}, 122 {ENDTOKEN, "", NONE, NULL} 123 }; 124 125 static struct parse_result res; 126 127 struct parse_result * 128 parse(int argc, char *argv[]) 129 { 130 const struct token *table = t_main; 131 const struct token *match; 132 133 bzero(&res, sizeof(res)); 134 135 while (argc >= 0) { 136 if ((match = match_token(argv[0], table)) == NULL) { 137 fprintf(stderr, "valid commands/args:\n"); 138 show_valid_args(table); 139 return (NULL); 140 } 141 142 argc--; 143 argv++; 144 145 if (match->type == NOTOKEN || match->next == NULL) 146 break; 147 148 table = match->next; 149 } 150 151 if (argc > 0) { 152 fprintf(stderr, "superfluous argument: %s\n", argv[0]); 153 return (NULL); 154 } 155 156 return (&res); 157 } 158 159 const struct token * 160 match_token(const char *word, const struct token table[]) 161 { 162 u_int i, match; 163 const struct token *t = NULL; 164 const char *errstr; 165 166 match = 0; 167 168 for (i = 0; table[i].type != ENDTOKEN; i++) { 169 switch (table[i].type) { 170 case NOTOKEN: 171 if (word == NULL || strlen(word) == 0) { 172 match++; 173 t = &table[i]; 174 } 175 break; 176 case KEYWORD: 177 if (word != NULL && strncmp(word, table[i].keyword, 178 strlen(word)) == 0) { 179 match++; 180 t = &table[i]; 181 if (t->value) 182 res.action = t->value; 183 } 184 break; 185 case HOSTID: 186 if (word == NULL) 187 break; 188 res.id.id = strtonum(word, 0, UINT_MAX, &errstr); 189 if (errstr) { 190 strlcpy(res.id.name, word, sizeof(res.id.name)); 191 res.id.id = EMPTY_ID; 192 } 193 t = &table[i]; 194 match++; 195 break; 196 case TABLEID: 197 if (word == NULL) 198 break; 199 res.id.id = strtonum(word, 0, UINT_MAX, &errstr); 200 if (errstr) { 201 strlcpy(res.id.name, word, sizeof(res.id.name)); 202 res.id.id = EMPTY_ID; 203 } 204 t = &table[i]; 205 match++; 206 break; 207 case RDRID: 208 if (word == NULL) 209 break; 210 res.id.id = strtonum(word, 0, UINT_MAX, &errstr); 211 if (errstr) { 212 strlcpy(res.id.name, word, sizeof(res.id.name)); 213 res.id.id = EMPTY_ID; 214 } 215 t = &table[i]; 216 match++; 217 break; 218 case ENDTOKEN: 219 break; 220 } 221 } 222 223 if (match != 1) { 224 if (word == NULL) 225 fprintf(stderr, "missing argument:\n"); 226 else if (match > 1) 227 fprintf(stderr, "ambiguous argument: %s\n", word); 228 else if (match < 1) 229 fprintf(stderr, "unknown argument: %s\n", word); 230 return (NULL); 231 } 232 233 return (t); 234 } 235 236 void 237 show_valid_args(const struct token table[]) 238 { 239 int i; 240 241 for (i = 0; table[i].type != ENDTOKEN; i++) { 242 switch (table[i].type) { 243 case NOTOKEN: 244 fprintf(stderr, " <cr>\n"); 245 break; 246 case KEYWORD: 247 fprintf(stderr, " %s\n", table[i].keyword); 248 break; 249 case RDRID: 250 fprintf(stderr, " <redirectid>\n"); 251 break; 252 case TABLEID: 253 fprintf(stderr, " <tableid>\n"); 254 break; 255 case HOSTID: 256 fprintf(stderr, " <hostid>\n"); 257 break; 258 case ENDTOKEN: 259 break; 260 } 261 } 262 } 263