1 /* $OpenBSD: parser.c,v 1.4 2005/03/12 11:03:05 norby Exp $ */ 2 3 /* 4 * Copyright (c) 2004 Esben Norby <norby@openbsd.org> 5 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/types.h> 21 #include <sys/socket.h> 22 #include <netinet/in.h> 23 #include <arpa/inet.h> 24 #include <err.h> 25 #include <errno.h> 26 #include <limits.h> 27 #include <stdio.h> 28 #include <stdlib.h> 29 #include <string.h> 30 31 #include "parser.h" 32 33 enum token_type { 34 NOTOKEN, 35 ENDTOKEN, 36 KEYWORD, 37 ADDRESS, 38 FLAG, 39 PREFIX, 40 IFNAME 41 }; 42 43 struct token { 44 enum token_type type; 45 const char *keyword; 46 int value; 47 const struct token *next; 48 }; 49 50 static const struct token t_main[]; 51 static const struct token t_show[]; 52 static const struct token t_show_iface[]; 53 static const struct token t_show_db[]; 54 static const struct token t_show_area[]; 55 static const struct token t_show_nbr[]; 56 static const struct token t_show_rib[]; 57 58 static const struct token t_main[] = { 59 /* {KEYWORD, "reload", RELOAD, NULL}, */ 60 {KEYWORD, "show", SHOW, t_show}, 61 {ENDTOKEN, "", NONE, NULL} 62 }; 63 64 static const struct token t_show[] = { 65 {NOTOKEN, "", NONE, NULL}, 66 {KEYWORD, "interfaces", SHOW_IFACE, t_show_iface}, 67 {KEYWORD, "database", SHOW_DB, t_show_db}, 68 {KEYWORD, "neighbor", SHOW_NBR, t_show_nbr}, 69 /* {KEYWORD, "summary", SHOW_SUMMARY, NULL}, */ 70 {KEYWORD, "rib", SHOW_RIB, t_show_rib}, 71 {ENDTOKEN, "", NONE, NULL} 72 }; 73 74 static const struct token t_show_iface[] = { 75 {NOTOKEN, "", NONE, NULL}, 76 {IFNAME, "", NONE, NULL}, 77 {ENDTOKEN, "", NONE, NULL} 78 }; 79 80 static const struct token t_show_db[] = { 81 {NOTOKEN, "", NONE, NULL}, 82 {KEYWORD, "area", SHOW_DBBYAREA, t_show_area}, 83 /* {KEYWORD, "router", NONE, NULL}, 84 {KEYWORD, "network", NONE, NULL}, */ 85 {ENDTOKEN, "", NONE, NULL} 86 }; 87 88 static const struct token t_show_area[] = { 89 {ADDRESS, "", NONE, NULL}, 90 {ENDTOKEN, "", NONE, NULL} 91 }; 92 93 static const struct token t_show_nbr[] = { 94 {NOTOKEN, "", NONE, NULL}, 95 {KEYWORD, "detail", SHOW_NBR_DTAIL, NULL}, 96 {ENDTOKEN, "", NONE, NULL} 97 }; 98 99 static const struct token t_show_rib[] = { 100 {NOTOKEN, "", NONE, NULL}, 101 {KEYWORD, "detail", SHOW_RIB_DTAIL, NULL}, 102 {ENDTOKEN, "", NONE, NULL} 103 }; 104 105 static struct parse_result res; 106 107 struct parse_result * 108 parse(int argc, char *argv[]) 109 { 110 const struct token *table = t_main; 111 const struct token *match; 112 113 bzero(&res, sizeof(res)); 114 115 while (argc > 0) { 116 if ((match = match_token(argv[0], table)) == NULL) { 117 fprintf(stderr, "valid commands/args:\n"); 118 show_valid_args(table); 119 return (NULL); 120 } 121 122 argc--; 123 argv++; 124 125 if (match->type == NOTOKEN || match->next == NULL) 126 break; 127 128 table = match->next; 129 } 130 131 if (argc > 0) { 132 fprintf(stderr, "superfluous argument: %s\n", argv[0]); 133 return (NULL); 134 } 135 136 return (&res); 137 } 138 139 const struct token * 140 match_token(const char *word, const struct token table[]) 141 { 142 u_int i, match; 143 const struct token *t = NULL; 144 145 match = 0; 146 147 for (i = 0; table[i].type != ENDTOKEN; i++) { 148 switch (table[i].type) { 149 case NOTOKEN: 150 if (word == NULL || strlen(word) == 0) { 151 match++; 152 t = &table[i]; 153 } 154 break; 155 case KEYWORD: 156 if (word != NULL && strncmp(word, table[i].keyword, 157 strlen(word)) == 0) { 158 match++; 159 t = &table[i]; 160 if (t->value) 161 res.action = t->value; 162 } 163 break; 164 case FLAG: 165 if (word != NULL && strncmp(word, table[i].keyword, 166 strlen(word)) == 0) { 167 match++; 168 t = &table[i]; 169 res.flags |= t->value; 170 } 171 break; 172 case ADDRESS: 173 if (parse_addr(word, &res.addr)) { 174 match++; 175 t = &table[i]; 176 if (t->value) 177 res.action = t->value; 178 } 179 break; 180 case PREFIX: 181 if (parse_prefix(word, &res.addr, &res.prefixlen)) { 182 match++; 183 t = &table[i]; 184 if (t->value) 185 res.action = t->value; 186 } 187 break; 188 case IFNAME: 189 if (!match && word != NULL && strlen(word) > 0) { 190 if (strlcpy(res.ifname, word, 191 sizeof(res.ifname)) >= 192 sizeof(res.ifname)) 193 err(1, "interface name too long"); 194 match++; 195 t = &table[i]; 196 } 197 break; 198 199 case ENDTOKEN: 200 break; 201 } 202 } 203 204 if (match != 1) { 205 if (match > 1) 206 fprintf(stderr, "ambiguous argument: %s\n", word); 207 if (match < 1) 208 fprintf(stderr, "unknown argument: %s\n", word); 209 return (NULL); 210 } 211 212 return (t); 213 } 214 215 void 216 show_valid_args(const struct token table[]) 217 { 218 int i; 219 220 for (i = 0; table[i].type != ENDTOKEN; i++) { 221 switch (table[i].type) { 222 case NOTOKEN: 223 fprintf(stderr, " <cr>\n"); 224 break; 225 case KEYWORD: 226 case FLAG: 227 fprintf(stderr, " %s\n", table[i].keyword); 228 break; 229 case ADDRESS: 230 fprintf(stderr, " <address>\n"); 231 break; 232 case PREFIX: 233 fprintf(stderr, " <address>[/<len>]\n"); 234 break; 235 case IFNAME: 236 fprintf(stderr, " <interface>\n"); 237 case ENDTOKEN: 238 break; 239 } 240 } 241 } 242 243 int 244 parse_addr(const char *word, struct in_addr *addr) 245 { 246 struct in_addr ina; 247 248 if (word == NULL) 249 return (0); 250 251 bzero(addr, sizeof(struct in_addr)); 252 bzero(&ina, sizeof(ina)); 253 254 if (inet_pton(AF_INET, word, &ina)) { 255 addr->s_addr = ina.s_addr; 256 return (1); 257 } 258 259 return (0); 260 } 261 262 int 263 parse_prefix(const char *word, struct in_addr *addr, u_int8_t *prefixlen) 264 { 265 struct in_addr ina; 266 int bits = 32; 267 268 if (word == NULL) 269 return (0); 270 271 bzero(addr, sizeof(struct in_addr)); 272 bzero(&ina, sizeof(ina)); 273 274 if (strrchr(word, '/') != NULL) { 275 if ((bits = inet_net_pton(AF_INET, word, 276 &ina, sizeof(ina))) == -1) 277 return (0); 278 addr->s_addr = ina.s_addr & htonl(0xffffffff << (32 - bits)); 279 *prefixlen = bits; 280 return (1); 281 } else { 282 *prefixlen = 32; 283 return (parse_addr(word, addr)); 284 } 285 286 return (0); 287 } 288