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extban: implement helper functions for stackable extbans (part 1) (ref #74)

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William Pitcock 2015-12-10 01:33:30 -06:00
parent 202d496644
commit 304bd0d095
3 changed files with 53 additions and 2 deletions
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11
doc/extban.txt
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@ -88,5 +88,12 @@ The function is called whenever a (local) client needs to be checked against
a +bqeI entry of the given extban type, and whenever a local client tries to a +bqeI entry of the given extban type, and whenever a local client tries to
add such an entry. (Clients are allowed to add bans matching themselves.) add such an entry. (Clients are allowed to add bans matching themselves.)
-- There is a convenience function which allows extbans to be stacked:
$Id: extban.txt 1639 2006-06-04 23:26:47Z jilles $ extern int match_child(const char *banstr, struct Client *client_p, struct Channel *chptr, long mode_type);
The arguments are as follows:
banstr: the text after the parent banstr (extb functions already get the mask this way)
client_p: the client to check; this is always a local client, which may be
on or off channel
chptr: the channel
mode_type: CHFL_BAN, CHFL_QUIET, CHFL_EXCEPTION or CHFL_INVEX

1
include/channel.h
View file

@ -266,6 +266,7 @@ extern struct Ban * del_id(struct Channel *chptr, const char *banid, rb_dlink_li
extern ExtbanFunc extban_table[256]; extern ExtbanFunc extban_table[256];
extern int match_child(const char *banstr, struct Client *client_p, struct Channel *chptr, long mode_type);
extern int match_extban(const char *banstr, struct Client *client_p, struct Channel *chptr, long mode_type); extern int match_extban(const char *banstr, struct Client *client_p, struct Channel *chptr, long mode_type);
extern int valid_extban(const char *banstr, struct Client *client_p, struct Channel *chptr, long mode_type); extern int valid_extban(const char *banstr, struct Client *client_p, struct Channel *chptr, long mode_type);
const char * get_extban_string(void); const char * get_extban_string(void);

43
src/extban.c
View file

@ -26,9 +26,52 @@
#include "channel.h" #include "channel.h"
#include "client.h" #include "client.h"
#include "common.h" #include "common.h"
#include "ipv4_from_ipv6.h"
ExtbanFunc extban_table[256] = { NULL }; ExtbanFunc extban_table[256] = { NULL };
int
match_child(const char *banstr, struct Client *client_p, struct Channel *chptr, long mode_type)
{
char src_host[NICKLEN + USERLEN + HOSTLEN + 6];
char src_iphost[NICKLEN + USERLEN + HOSTLEN + 6];
char src_althost[NICKLEN + USERLEN + HOSTLEN + 6];
char src_ip4host[NICKLEN + USERLEN + HOSTLEN + 6];
struct sockaddr_in ip4;
char *s = src_host, *s2 = src_iphost, *s3 = NULL, *s4 = NULL;
if (*banstr == '$')
return match_extban(banstr, client_p, chptr, mode_type) ? EXTBAN_MATCH : EXTBAN_NOMATCH;
rb_sprintf(src_host, "%s!%s@%s", client_p->name, client_p->username, client_p->host);
rb_sprintf(src_iphost, "%s!%s@%s", client_p->name, client_p->username, client_p->sockhost);
/* handle hostmangling if necessary */
if (client_p->localClient->mangledhost != NULL)
{
if (!strcmp(client_p->host, client_p->localClient->mangledhost))
rb_sprintf(src_althost, "%s!%s@%s", client_p->name, client_p->username, client_p->orighost);
else if (!IsDynSpoof(client_p))
rb_sprintf(src_althost, "%s!%s@%s", client_p->name, client_p->username, client_p->localClient->mangledhost);
s3 = src_althost;
}
#ifdef RB_IPV6
/* handle Teredo if necessary */
if (client_p->localClient->ip.ss_family == AF_INET6 && ipv4_from_ipv6((const struct sockaddr_in6 *) &client_p->localClient->ip, &ip4))
{
rb_sprintf(src_ip4host, "%s!%s@", client_p->name, client_p->username);
s4 = src_ip4host + strlen(src_ip4host);
rb_inet_ntop_sock((struct sockaddr *)&ip4,
s4, src_ip4host + sizeof src_ip4host - s4);
s4 = src_ip4host;
}
#endif
return match(banstr, s) || match(banstr, s2) || (s3 != NULL && match(banstr, s3)) || (s4 != NULL && match(banstr, s4)) ? EXTBAN_MATCH : EXTBAN_NOMATCH;
}
int int
match_extban(const char *banstr, struct Client *client_p, struct Channel *chptr, long mode_type) match_extban(const char *banstr, struct Client *client_p, struct Channel *chptr, long mode_type)
{ {