diff options
Diffstat (limited to 'usr.sbin/switchctl/parser.c')
| -rw-r--r-- | usr.sbin/switchctl/parser.c | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/usr.sbin/switchctl/parser.c b/usr.sbin/switchctl/parser.c new file mode 100644 index 00000000000..ee671c8adb6 --- /dev/null +++ b/usr.sbin/switchctl/parser.c @@ -0,0 +1,284 @@ +/* $OpenBSD: parser.c,v 1.1 2016/07/19 16:54:26 reyk Exp $ */ + +/* + * Copyright (c) 2010-2013 Reyk Floeter <reyk@openbsd.org> + * Copyright (c) 2004 Esben Norby <norby@openbsd.org> + * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/queue.h> +#include <sys/tree.h> + +#include <err.h> +#include <errno.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <event.h> +#include <netdb.h> + +#include "switchd.h" +#include "parser.h" + +enum token_type { + NOTOKEN, + ENDTOKEN, + KEYWORD, + PATH, + ADDRESS, + FQDN, + DEVICE, + URI +}; + +struct token { + enum token_type type; + const char *keyword; + int value; + const struct token *next; +}; + +static const struct token t_main[]; +static const struct token t_reset[]; +static const struct token t_log[]; +static const struct token t_load[]; +static const struct token t_show[]; +static const struct token t_device[]; +static const struct token t_device_add[]; +static const struct token t_device_remove[]; +static const struct token t_connect_to[]; +static const struct token t_uri[]; + +static const struct token t_main[] = { + { KEYWORD, "device", NONE, t_device }, + { KEYWORD, "load", LOAD, t_load }, + { KEYWORD, "log", NONE, t_log }, + { KEYWORD, "monitor", MONITOR, NULL }, + { KEYWORD, "reload", RELOAD, NULL }, + { KEYWORD, "reset", NONE, t_reset }, + { KEYWORD, "show", NONE, t_show }, + { ENDTOKEN, "", NONE, NULL } +}; + +static const struct token t_log[] = { + { KEYWORD, "verbose", LOG_VERBOSE, NULL }, + { KEYWORD, "brief", LOG_BRIEF, NULL }, + { ENDTOKEN, "", NONE, NULL } +}; + +static const struct token t_reset[] = { + { KEYWORD, "all", RESETALL, NULL }, + { ENDTOKEN, "", NONE, NULL } +}; + +static const struct token t_load[] = { + { PATH, "", NONE, NULL }, + { ENDTOKEN, "", NONE, NULL } +}; + +static const struct token t_opt_path[] = { + { NOTOKEN, "", NONE, NULL }, + { PATH, "", NONE, NULL }, + { ENDTOKEN, "", NONE, NULL } +}; + +static const struct token t_show[] = { + { KEYWORD, "summary", SHOW_SUM, NULL }, + { KEYWORD, "switches", SHOW_SWITCHES, NULL }, + { KEYWORD, "macs", SHOW_MACS, NULL }, + { ENDTOKEN, "", NONE, NULL } +}; +static const struct token t_device[] = { + { KEYWORD, "add", ADD_DEVICE, t_device_add }, + { KEYWORD, "remove", REMOVE_DEVICE, t_device_remove }, + { ENDTOKEN, "", NONE, NULL } +}; +static const struct token t_device_add[] = { + { DEVICE, "", NONE, t_connect_to }, + { ENDTOKEN, "", NONE, NULL } +}; +static const struct token t_device_remove[] = { + { DEVICE, "", NONE, NULL }, + { ENDTOKEN, "", NONE, NULL } +}; +static const struct token t_connect_to[] = { + { KEYWORD, "connect-to", NONE, t_uri }, + { ENDTOKEN, "", NONE, NULL } +}; +static const struct token t_uri[] = { + { URI, "", NONE, NULL }, + { ENDTOKEN, "", NONE, NULL } +}; + +static struct parse_result res; + +const struct token *match_token(char *, const struct token []); +void show_valid_args(const struct token []); +int parse_addr(const char *); + +struct parse_result * +parse(int argc, char *argv[]) +{ + const struct token *table = t_main; + const struct token *match; + + bzero(&res, sizeof(res)); + + while (argc >= 0) { + if ((match = match_token(argv[0], table)) == NULL) { + fprintf(stderr, "valid commands/args:\n"); + show_valid_args(table); + return (NULL); + } + + argc--; + argv++; + + if (match->type == NOTOKEN || match->next == NULL) + break; + + table = match->next; + } + + if (argc > 0) { + fprintf(stderr, "superfluous argument: %s\n", argv[0]); + return (NULL); + } + + return (&res); +} + +int +parse_addr(const char *word) +{ + struct addrinfo hints, *r; + + bzero(&hints, sizeof(hints)); + hints.ai_socktype = SOCK_DGRAM; /* dummy */ + hints.ai_family = PF_UNSPEC; + hints.ai_flags = AI_NUMERICHOST; + if (getaddrinfo(word, "0", &hints, &r) == 0) { + return (0); + } + + return (1); +} + + +const struct token * +match_token(char *word, const struct token table[]) +{ + unsigned int i, match = 0; + const struct token *t = NULL; + + for (i = 0; table[i].type != ENDTOKEN; i++) { + switch (table[i].type) { + case NOTOKEN: + if (word == NULL || strlen(word) == 0) { + match++; + t = &table[i]; + } + break; + case KEYWORD: + if (word != NULL && strncmp(word, table[i].keyword, + strlen(word)) == 0) { + match++; + t = &table[i]; + if (t->value) + res.action = t->value; + } + break; + case DEVICE: + case PATH: + if (!match && word != NULL && strlen(word) > 0) { + res.path = strdup(word); + match++; + t = &table[i]; + } + break; + case ADDRESS: + case FQDN: + if (!match && word != NULL && strlen(word) > 0) { + parse_addr(word); + res.host = strdup(word); + if (parse_addr(word) == 0) + res.htype = HOST_IPADDR; + else + res.htype = HOST_FQDN; + match++; + t = &table[i]; + } + break; + case URI: + if (!match && word != NULL && strlen(word) > 0) { + res.uri = strdup(word); + match++; + t = &table[i]; + } + break; + case ENDTOKEN: + break; + } + } + + if (match != 1) { + if (word == NULL) + fprintf(stderr, "missing argument:\n"); + else if (match > 1) + fprintf(stderr, "ambiguous argument: %s\n", word); + else if (match < 1) + fprintf(stderr, "unknown argument: %s\n", word); + return (NULL); + } + + return (t); +} + +void +show_valid_args(const struct token table[]) +{ + int i; + + for (i = 0; table[i].type != ENDTOKEN; i++) { + switch (table[i].type) { + case NOTOKEN: + fprintf(stderr, " <cr>\n"); + break; + case KEYWORD: + fprintf(stderr, " %s\n", table[i].keyword); + break; + case PATH: + fprintf(stderr, " <path>\n"); + break; + case ADDRESS: + fprintf(stderr, " <ipaddr>\n"); + break; + case FQDN: + fprintf(stderr, " <fqdn>\n"); + break; + case DEVICE: + fprintf(stderr, " <device>\n"); + break; + case URI: + fprintf(stderr, " <uri>\n"); + break; + case ENDTOKEN: + break; + } + } +} |