1 /* $OpenBSD: parser.c,v 1.5 2010/09/04 21:31:04 tedu Exp $ */ 2 3 /* 4 * Copyright (c) 2009 Michele Marchetto <michele@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 <netinet/in.h> 24 #include <arpa/inet.h> 25 #include <err.h> 26 #include <errno.h> 27 #include <limits.h> 28 #include <stdio.h> 29 #include <stdlib.h> 30 #include <string.h> 31 32 #include "ldpd.h" 33 34 #include "parser.h" 35 36 enum token_type { 37 NOTOKEN, 38 ENDTOKEN, 39 KEYWORD, 40 ADDRESS, 41 FLAG, 42 PREFIX, 43 IFNAME 44 }; 45 46 struct token { 47 enum token_type type; 48 const char *keyword; 49 int value; 50 const struct token *next; 51 }; 52 53 static const struct token t_main[]; 54 static const struct token t_fib[]; 55 static const struct token t_show[]; 56 static const struct token t_show_iface[]; 57 static const struct token t_show_db[]; 58 static const struct token t_show_area[]; 59 static const struct token t_show_nbr[]; 60 static const struct token t_show_lib[]; 61 static const struct token t_show_fib[]; 62 static const struct token t_log[]; 63 64 static const struct token t_main[] = { 65 /* {KEYWORD, "reload", RELOAD, NULL}, */ 66 {KEYWORD, "fib", FIB, t_fib}, 67 {KEYWORD, "show", SHOW, t_show}, 68 {KEYWORD, "log", NONE, t_log}, 69 {ENDTOKEN, "", NONE, NULL} 70 }; 71 72 static const struct token t_fib[] = { 73 { KEYWORD, "couple", FIB_COUPLE, NULL}, 74 { KEYWORD, "decouple", FIB_DECOUPLE, NULL}, 75 { ENDTOKEN, "", NONE, NULL} 76 }; 77 78 static const struct token t_show[] = { 79 {NOTOKEN, "", NONE, NULL}, 80 {KEYWORD, "interfaces", SHOW_IFACE, t_show_iface}, 81 {KEYWORD, "neighbor", SHOW_NBR, t_show_nbr}, 82 {KEYWORD, "lib", SHOW_LIB, t_show_lib}, 83 {KEYWORD, "fib", SHOW_FIB, t_show_fib}, 84 {ENDTOKEN, "", NONE, NULL} 85 }; 86 87 static const struct token t_show_iface[] = { 88 {NOTOKEN, "", NONE, NULL}, 89 {ENDTOKEN, "", NONE, NULL} 90 }; 91 92 static const struct token t_show_nbr[] = { 93 {NOTOKEN, "", NONE, NULL}, 94 {ENDTOKEN, "", NONE, NULL} 95 }; 96 97 static const struct token t_show_lib[] = { 98 {NOTOKEN, "", NONE, NULL}, 99 {ENDTOKEN, "", NONE, NULL} 100 }; 101 102 static const struct token t_log[] = { 103 {KEYWORD, "verbose", LOG_VERBOSE, NULL}, 104 {KEYWORD, "brief", LOG_BRIEF, NULL}, 105 {ENDTOKEN, "", NONE, NULL} 106 }; 107 108 static const struct token t_show_fib[] = { 109 {NOTOKEN, "", NONE, NULL}, 110 {KEYWORD, "interface", SHOW_FIB_IFACE, t_show_iface}, 111 {FLAG, "connected", F_CONNECTED, t_show_fib}, 112 {FLAG, "static", F_STATIC, t_show_fib}, 113 {ADDRESS, "", NONE, NULL}, 114 {ENDTOKEN, "", NONE, NULL} 115 }; 116 117 static const struct token *match_token(const char *, const struct token *, 118 struct parse_result *); 119 static void show_valid_args(const struct token *); 120 121 struct parse_result * 122 parse(int argc, char *argv[]) 123 { 124 static struct parse_result res; 125 const struct token *table = t_main; 126 const struct token *match; 127 128 bzero(&res, sizeof(res)); 129 130 while (argc >= 0) { 131 if ((match = match_token(argv[0], table, &res)) == NULL) { 132 fprintf(stderr, "valid commands/args:\n"); 133 show_valid_args(table); 134 return (NULL); 135 } 136 137 argc--; 138 argv++; 139 140 if (match->type == NOTOKEN || match->next == NULL) 141 break; 142 143 table = match->next; 144 } 145 146 if (argc > 0) { 147 fprintf(stderr, "superfluous argument: %s\n", argv[0]); 148 return (NULL); 149 } 150 151 return (&res); 152 } 153 154 static const struct token * 155 match_token(const char *word, const struct token *table, 156 struct parse_result *res) 157 { 158 u_int i, match; 159 const struct token *t = NULL; 160 161 match = 0; 162 163 for (i = 0; table[i].type != ENDTOKEN; i++) { 164 switch (table[i].type) { 165 case NOTOKEN: 166 if (word == NULL || strlen(word) == 0) { 167 match++; 168 t = &table[i]; 169 } 170 break; 171 case KEYWORD: 172 if (word != NULL && strncmp(word, table[i].keyword, 173 strlen(word)) == 0) { 174 match++; 175 t = &table[i]; 176 if (t->value) 177 res->action = t->value; 178 } 179 break; 180 case FLAG: 181 if (word != NULL && strncmp(word, table[i].keyword, 182 strlen(word)) == 0) { 183 match++; 184 t = &table[i]; 185 res->flags |= t->value; 186 } 187 break; 188 case ADDRESS: 189 if (parse_addr(word, &res->addr)) { 190 match++; 191 t = &table[i]; 192 if (t->value) 193 res->action = t->value; 194 } 195 break; 196 case PREFIX: 197 if (parse_prefix(word, &res->addr, &res->prefixlen)) { 198 match++; 199 t = &table[i]; 200 if (t->value) 201 res->action = t->value; 202 } 203 break; 204 case IFNAME: 205 if (!match && word != NULL && strlen(word) > 0) { 206 if (strlcpy(res->ifname, word, 207 sizeof(res->ifname)) >= 208 sizeof(res->ifname)) 209 err(1, "interface name too long"); 210 match++; 211 t = &table[i]; 212 if (t->value) 213 res->action = t->value; 214 } 215 break; 216 217 case ENDTOKEN: 218 break; 219 } 220 } 221 222 if (match != 1) { 223 if (word == NULL) 224 fprintf(stderr, "missing argument:\n"); 225 else if (match > 1) 226 fprintf(stderr, "ambiguous argument: %s\n", word); 227 else if (match < 1) 228 fprintf(stderr, "unknown argument: %s\n", word); 229 return (NULL); 230 } 231 232 return (t); 233 } 234 235 static void 236 show_valid_args(const struct token *table) 237 { 238 int i; 239 240 for (i = 0; table[i].type != ENDTOKEN; i++) { 241 switch (table[i].type) { 242 case NOTOKEN: 243 fprintf(stderr, " <cr>\n"); 244 break; 245 case KEYWORD: 246 case FLAG: 247 fprintf(stderr, " %s\n", table[i].keyword); 248 break; 249 case ADDRESS: 250 fprintf(stderr, " <address>\n"); 251 break; 252 case PREFIX: 253 fprintf(stderr, " <address>[/<len>]\n"); 254 break; 255 case IFNAME: 256 fprintf(stderr, " <interface>\n"); 257 case ENDTOKEN: 258 break; 259 } 260 } 261 } 262 263 int 264 parse_addr(const char *word, struct in_addr *addr) 265 { 266 struct in_addr ina; 267 268 if (word == NULL) 269 return (0); 270 271 bzero(addr, sizeof(struct in_addr)); 272 bzero(&ina, sizeof(ina)); 273 274 if (inet_pton(AF_INET, word, &ina)) { 275 addr->s_addr = ina.s_addr; 276 return (1); 277 } 278 279 return (0); 280 } 281 282 int 283 parse_prefix(const char *word, struct in_addr *addr, u_int8_t *prefixlen) 284 { 285 struct in_addr ina; 286 int bits = 32; 287 288 if (word == NULL) 289 return (0); 290 291 bzero(addr, sizeof(struct in_addr)); 292 bzero(&ina, sizeof(ina)); 293 294 if (strrchr(word, '/') != NULL) { 295 if ((bits = inet_net_pton(AF_INET, word, 296 &ina, sizeof(ina))) == -1) 297 return (0); 298 addr->s_addr = ina.s_addr & htonl(prefixlen2mask(bits)); 299 *prefixlen = bits; 300 return (1); 301 } else { 302 *prefixlen = 32; 303 return (parse_addr(word, addr)); 304 } 305 306 return (0); 307 } 308 309 /* XXX local copy from kroute.c, should go to shared file */ 310 in_addr_t 311 prefixlen2mask(u_int8_t prefixlen) 312 { 313 if (prefixlen == 0) 314 return (0); 315 316 return (0xffffffff << (32 - prefixlen)); 317 } 318