diff options
Diffstat (limited to 'usr.sbin/hoststatectl/parser.c')
| -rw-r--r-- | usr.sbin/hoststatectl/parser.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/usr.sbin/hoststatectl/parser.c b/usr.sbin/hoststatectl/parser.c new file mode 100644 index 00000000000..a2247a907fc --- /dev/null +++ b/usr.sbin/hoststatectl/parser.c @@ -0,0 +1,232 @@ +/* $OpenBSD: parser.c,v 1.1 2006/12/16 11:45:07 reyk Exp $ */ + +/* + * Copyright (c) 2006 Pierre-Yves Ritschard <pyr@spootnik.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 <netinet/in.h> +#include <net/if.h> +#include <arpa/inet.h> +#include <err.h> +#include <errno.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <event.h> + +#include "hostated.h" + +#include "parser.h" + +enum token_type { + NOTOKEN, + ENDTOKEN, + HOSTID, + TABLEID, + SERVICEID, + KEYWORD +}; + +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_show[]; +static const struct token t_service[]; +static const struct token t_table[]; +static const struct token t_host[]; +static const struct token t_service_id[]; +static const struct token t_table_id[]; +static const struct token t_host_id[]; + +static const struct token t_main[] = { + {KEYWORD, "show", SHOW_SUM, NULL}, + {KEYWORD, "stop", SHUTDOWN, NULL}, + {KEYWORD, "service", NULL, t_service}, + {KEYWORD, "table", NULL, t_table}, + {KEYWORD, "host", NULL, t_host}, + {ENDTOKEN, "", NONE, NULL} +}; + +static const struct token t_service[] = { + {NOTOKEN, "", NONE, NULL}, + {KEYWORD, "disable", SERV_DISABLE, t_service_id}, + {KEYWORD, "enable", SERV_ENABLE, t_service_id}, + {ENDTOKEN, "", NONE, NULL} +}; + +static const struct token t_table[] = { + {NOTOKEN, "", NONE, NULL}, + {KEYWORD, "disable", TABLE_DISABLE, t_table_id}, + {KEYWORD, "enable", TABLE_ENABLE, t_table_id}, + {ENDTOKEN, "", NONE, NULL} +}; + +static const struct token t_host[] = { + {NOTOKEN, "", NONE, NULL}, + {KEYWORD, "disable", HOST_DISABLE, t_host_id}, + {KEYWORD, "enable", HOST_ENABLE, t_host_id}, + {ENDTOKEN, "", NONE, NULL} +}; + +static const struct token t_service_id[] = { + {SERVICEID, "", NONE, NULL}, + {ENDTOKEN, "", NONE, NULL} +}; + +static const struct token t_table_id[] = { + {TABLEID, "", NONE, NULL}, + {ENDTOKEN, "", NONE, NULL} +}; + +static const struct token t_host_id[] = { + {HOSTID, "", NONE, NULL}, + {ENDTOKEN, "", NONE, NULL} +}; + +static struct parse_result res; + +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); +} + +const struct token * +match_token(const char *word, const struct token table[]) +{ + u_int i, match; + const struct token *t = NULL; + const char *errstr; + + match = 0; + + 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 HOSTID: + res.id = strtonum(word, 0, UINT_MAX, &errstr); + if (errstr) + errx(1, "host id %s is %s", word, errstr); + t = &table[i]; + match++; + break; + case TABLEID: + res.id = strtonum(word, 0, UINT_MAX, &errstr); + if (errstr) + errx(1, "table id %s is %s", word, errstr); + t = &table[i]; + match++; + break; + case SERVICEID: + res.id = strtonum(word, 0, UINT_MAX, &errstr); + if (errstr) + errx(1, "service id %s is %s", word, errstr); + t = &table[i]; + match++; + break; + case ENDTOKEN: + break; + } + } + + if (match != 1) { + if (match > 1) + fprintf(stderr, "ambiguous argument: %s\n", word); + 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 SERVICEID: + fprintf(stderr, " <serviceid>\n"); + break; + case TABLEID: + fprintf(stderr, " <tableid>\n"); + break; + case HOSTID: + fprintf(stderr, " <hostid>\n"); + break; + case ENDTOKEN: + break; + } + } +} |