/* argument name resolver
*
* Copyright (c) 2004 Jamie Wilkinson <jaq@spacepants.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "resolver.h"
#include "ast.h"
#include "icmpent.h"
void resolve_option_specifier(struct option_specifier_s *n
__attribute__((unused))) {}
void resolve_icmptype_argument(struct icmptype_argument_s *n) {
struct icmpent_s *i;
if (n->icmptype) {
if ((i = geticmpbyname(n->icmptype))) {
free(n->icmptype);
if (asprintf(&n->icmptype, "%s", i->i_type) < 0) {
n->icmptype = NULL;
fprintf(
stderr,
"error: asprintf allocation failed when converting icmptype %s\n",
i->i_type);
}
} else {
/* check that the icmptype is a number if we can't resolve it */
long m;
char *e;
m = strtol(n->icmptype, &e, 10);
if (*e || m == LONG_MIN || m == LONG_MAX) {
fprintf(stderr, "warning: suspicious icmp type encountered: %s\n",
n->icmptype);
}
}
}
}
void resolve_icmptype_argument_list(struct icmptype_argument_list_s *n) {
if (n->list) {
resolve_icmptype_argument_list(n->list);
}
if (n->arg) {
resolve_icmptype_argument(n->arg);
}
}
void resolve_icmptype_specifier(struct icmptype_specifier_s *n) {
if (n->list) {
resolve_icmptype_argument_list(n->list);
}
}
void resolve_port_argument(struct port_argument_s *n) {
struct servent *s;
if (n->port_min) {
/* try to resolve the port name */
if ((s = getservbyname(n->port_min, NULL))) {
free(n->port_min);
if (asprintf(&n->port_min, "%d", ntohs(s->s_port)) < 0) {
n->port_min = NULL;
fprintf(stderr,
"error: asprintf allocation failed when resolving port %d\n",
ntohs(s->s_port));
}
} else {
/* check that the port is a number if we can't resolve it */
long m;
char *e;
m = strtol(n->port_min, &e, 10);
if (*e || m == LONG_MIN || m == LONG_MAX) {
fprintf(stderr, "warning: suspicious port name encountered: %s\n",
n->port_min);
}
}
}
if (n->port_max) {
/* try to resolve the port name */
if ((s = getservbyname(n->port_max, NULL))) {
free(n->port_max);
if (asprintf(&n->port_max, "%d", ntohs(s->s_port)) < 0) {
n->port_max = NULL;
fprintf(stderr,
"error: asprintf allocation failed when resolving port %d\n",
ntohs(s->s_port));
}
} else {
/* check that the port is a number if we can't resolve it */
long m;
char *e;
m = strtol(n->port_max, &e, 10);
if (*e || m == LONG_MIN || m == LONG_MAX) {
fprintf(stderr, "warning: suspicious port name encountered: %s\n",
n->port_max);
}
}
}
}
void resolve_port_argument_list(struct port_argument_list_s *n) {
if (n->list) {
resolve_port_argument_list(n->list);
}
if (n->arg) {
resolve_port_argument(n->arg);
}
}
void resolve_port_specifier(struct port_specifier_s *n) {
if (n->list) {
resolve_port_argument_list(n->list);
}
}
void resolve_protocol_argument(struct protocol_argument_s *n) {
struct protoent *p;
if (n->proto) {
if ((p = getprotobyname(n->proto))) {
free(n->proto);
if (asprintf(&n->proto, "%d", p->p_proto) < 0) {
n->proto = NULL;
fprintf(
stderr,
"error: asprintf allocation failed when converting protocol %d\n",
p->p_proto);
}
} else {
/* check that the proto is a number if we can't resolve it */
long m;
char *e;
m = strtol(n->proto, &e, 10);
if (*e || m == LONG_MIN || m == LONG_MAX) {
fprintf(stderr, "warning: suspicious protocol name encountered: %s\n",
n->proto);
}
}
}
}
void resolve_protocol_argument_list(struct protocol_argument_list_s *n) {
if (n->list) {
resolve_protocol_argument_list(n->list);
}
if (n->arg) {
resolve_protocol_argument(n->arg);
}
}
void resolve_protocol_specifier(struct protocol_specifier_s *n) {
if (n->list) {
resolve_protocol_argument_list(n->list);
}
}
void resolve_host_argument(struct host_argument_s *n __attribute__((unused))) {}
void resolve_host_argument_list(struct host_argument_list_s *n,
struct filtergen_opts *o) {
struct addrinfo *a = NULL, *i;
struct addrinfo hints;
int r;
struct host_argument_list_s *list = NULL;
struct host_argument_s *host = NULL;
if (n->list) {
resolve_host_argument_list(n->list, o);
}
if (n->arg) {
memset(&hints, 0, sizeof(struct addrinfo));
/* use our chosen address family */
hints.ai_family = o->family;
/* return hostname, though we don't use it, for debugging */
hints.ai_flags = AI_CANONNAME;
/* limit so duplicate hosts aren't returned for each socktype */
hints.ai_socktype = SOCK_STREAM;
if (n->arg->host) {
r = getaddrinfo(n->arg->host, NULL, &hints, &a);
switch (r) {
case 0:
/* replace the hostname with the IP */
free(n->arg->host);
/* getnameinfo does no allocation. */
n->arg->host = malloc(NI_MAXHOST + 1);
if (getnameinfo(a->ai_addr, a->ai_addrlen, n->arg->host, NI_MAXHOST,
NULL, 0, NI_NUMERICHOST) == 0) {
/* if there's more, create some more hosts */
for (i = a->ai_next; i; i = i->ai_next) {
list = malloc(sizeof(struct host_argument_list_s));
host = malloc(sizeof(struct host_argument_s));
host->host = malloc(NI_MAXHOST + 1);
if (getnameinfo(i->ai_addr, i->ai_addrlen, host->host, NI_MAXHOST,
NULL, 0, NI_NUMERICHOST) == 0) {
if (n->arg->mask) {
host->mask = strdup(n->arg->mask);
}
/* insert the new node */
list->arg = host;
list->list = n->list;
n->list = list;
} else {
fprintf(stderr, "warning: %s\n", strerror(errno));
}
}
} else {
fprintf(stderr, "warning: %s\n", strerror(errno));
}
freeaddrinfo(a);
break;
default:
fprintf(stderr, "warning: %s: %s\n", gai_strerror(r), n->arg->host);
break;
}
}
}
}
void resolve_host_specifier(struct host_specifier_s *n,
struct filtergen_opts *o) {
if (n->list) {
resolve_host_argument_list(n->list, o);
}
}
void resolve_target_specifier(struct target_specifier_s *n
__attribute__((unused))) {}
void resolve_direction_argument(struct direction_argument_s *n
__attribute__((unused))) {}
void resolve_direction_argument_list(struct direction_argument_list_s *n) {
if (n->list) {
resolve_direction_argument_list(n->list);
}
if (n->arg) {
resolve_direction_argument(n->arg);
}
}
void resolve_direction_specifier(struct direction_specifier_s *n) {
if (n->list) {
resolve_direction_argument_list(n->list);
}
}
void resolve_specifier_list(struct specifier_list_s *n,
struct filtergen_opts *o);
void resolve_subrule_list(struct subrule_list_s *n, struct filtergen_opts *o) {
if (n->subrule_list) {
resolve_subrule_list(n->subrule_list, o);
}
if (n->specifier_list) {
resolve_specifier_list(n->specifier_list, o);
}
}
void resolve_chaingroup_specifier(struct chaingroup_specifier_s *n,
struct filtergen_opts *o) {
if (n->list) {
resolve_subrule_list(n->list, o);
}
}
void resolve_compound_specifier(struct compound_specifier_s *n,
struct filtergen_opts *o) {
if (n->list) {
resolve_subrule_list(n->list, o);
}
}
void resolve_specifier(struct specifier_s *n, struct filtergen_opts *o) {
if (n->compound) {
resolve_compound_specifier(n->compound, o);
} else if (n->direction) {
resolve_direction_specifier(n->direction);
} else if (n->target) {
resolve_target_specifier(n->target);
} else if (n->host) {
resolve_host_specifier(n->host, o);
} else if (n->port) {
resolve_port_specifier(n->port);
} else if (n->protocol) {
resolve_protocol_specifier(n->protocol);
} else if (n->icmptype) {
resolve_icmptype_specifier(n->icmptype);
} else if (n->option) {
resolve_option_specifier(n->option);
} else if (n->chaingroup) {
resolve_chaingroup_specifier(n->chaingroup, o);
}
}
void resolve_negated_specifier(struct negated_specifier_s *n,
struct filtergen_opts *o) {
if (n->spec) {
resolve_specifier(n->spec, o);
}
}
void resolve_specifier_list(struct specifier_list_s *n,
struct filtergen_opts *o) {
if (n->list) {
resolve_specifier_list(n->list, o);
}
if (n->spec) {
resolve_negated_specifier(n->spec, o);
}
}
void resolve_rule(struct rule_s *n, struct filtergen_opts *o) {
if (n->list) {
resolve_specifier_list(n->list, o);
}
}
void resolve_rule_list(struct rule_list_s *n, struct filtergen_opts *o) {
if (n->list) {
resolve_rule_list(n->list, o);
}
if (n->rule) {
resolve_rule(n->rule, o);
}
}
void resolve_ast(struct ast_s *n, struct filtergen_opts *o) {
if (n->list) {
resolve_rule_list(n->list, o);
}
}
void resolve(struct ast_s *n, struct filtergen_opts *o) {
if (n) {
resolve_ast(n, o);
}
}