1/* $OpenBSD: parser.c,v 1.1 2018/07/10 22:12:43 florian 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/queue.h> 22#include <sys/socket.h> 23#include <netinet/in.h> 24#include <arpa/inet.h> 25#include <net/if.h> 26#include <err.h> 27#include <errno.h> 28#include <event.h> 29#include <imsg.h> 30#include <limits.h> 31#include <stdio.h> 32#include <stdlib.h> 33#include <string.h> 34 35#include "rad.h" 36#include "parser.h" 37 38enum token_type { 39 NOTOKEN, 40 ENDTOKEN, 41 KEYWORD 42}; 43 44struct token { 45 enum token_type type; 46 const char *keyword; 47 int value; 48 const struct token *next; 49}; 50 51static const struct token t_main[]; 52static const struct token t_log[]; 53 54static const struct token t_main[] = { 55 {KEYWORD, "reload", RELOAD, NULL}, 56 {KEYWORD, "log", NONE, t_log}, 57 {ENDTOKEN, "", NONE, NULL} 58}; 59 60static const struct token t_log[] = { 61 {KEYWORD, "verbose", LOG_VERBOSE, NULL}, 62 {KEYWORD, "brief", LOG_BRIEF, NULL}, 63 {ENDTOKEN, "", NONE, NULL} 64}; 65 66static const struct token *match_token(const char *, const struct token *, 67 struct parse_result *); 68static void show_valid_args(const struct token *); 69 70struct parse_result * 71parse(int argc, char *argv[]) 72{ 73 static struct parse_result res; 74 const struct token *table = t_main; 75 const struct token *match; 76 77 memset(&res, 0, sizeof(res)); 78 79 while (argc >= 0) { 80 if ((match = match_token(argv[0], table, &res)) == NULL) { 81 fprintf(stderr, "valid commands/args:\n"); 82 show_valid_args(table); 83 return (NULL); 84 } 85 86 argc--; 87 argv++; 88 89 if (match->type == NOTOKEN || match->next == NULL) 90 break; 91 92 table = match->next; 93 } 94 95 if (argc > 0) { 96 fprintf(stderr, "superfluous argument: %s\n", argv[0]); 97 return (NULL); 98 } 99 100 return (&res); 101} 102 103static const struct token * 104match_token(const char *word, const struct token *table, 105 struct parse_result *res) 106{ 107 u_int i, match; 108 const struct token *t = NULL; 109 110 match = 0; 111 112 for (i = 0; table[i].type != ENDTOKEN; i++) { 113 switch (table[i].type) { 114 case NOTOKEN: 115 if (word == NULL || strlen(word) == 0) { 116 match++; 117 t = &table[i]; 118 } 119 break; 120 case KEYWORD: 121 if (word != NULL && strncmp(word, table[i].keyword, 122 strlen(word)) == 0) { 123 match++; 124 t = &table[i]; 125 if (t->value) 126 res->action = t->value; 127 } 128 break; 129 case ENDTOKEN: 130 break; 131 } 132 } 133 134 if (match != 1) { 135 if (word == NULL) 136 fprintf(stderr, "missing argument:\n"); 137 else if (match > 1) 138 fprintf(stderr, "ambiguous argument: %s\n", word); 139 else if (match < 1) 140 fprintf(stderr, "unknown argument: %s\n", word); 141 return (NULL); 142 } 143 144 return (t); 145} 146 147static void 148show_valid_args(const struct token *table) 149{ 150 int i; 151 152 for (i = 0; table[i].type != ENDTOKEN; i++) { 153 switch (table[i].type) { 154 case NOTOKEN: 155 fprintf(stderr, " <cr>\n"); 156 break; 157 case KEYWORD: 158 fprintf(stderr, " %s\n", table[i].keyword); 159 break; 160 case ENDTOKEN: 161 break; 162 } 163 } 164} 165