emehta-contrib/ns_mxcheck_async.c

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#include "atheme-compat.h"
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#ifndef _WIN32
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <netdb.h>
DECLARE_MODULE_V1
(
"contrib/ns_mxcheck_async", false, _modinit, _moddeinit,
"1.1",
"Jamie L. Penman-Smithson <jamie@slacked.org>"
);
struct procdata
{
char name[NICKLEN];
char email[EMAILLEN];
};
#define MAX_CHILDPROCS 10
static unsigned int proccount;
static struct procdata procdata[MAX_CHILDPROCS];
static void childproc_cb(pid_t pid, int status, void *data);
static void check_registration(hook_user_register_check_t *hdata);
int count_mx (const char *host);
void _modinit(module_t *m)
{
hook_add_event("user_can_register");
hook_add_user_can_register(check_registration);
}
void _moddeinit(module_unload_intent_t intent)
{
hook_del_user_can_register(check_registration);
childproc_delete_all(childproc_cb);
}
static void childproc_cb(pid_t pid, int status, void *data)
{
struct procdata *pd = data;
myuser_t *mu;
const char *domain;
return_if_fail(proccount > 0);
proccount--;
if (!WIFEXITED(status))
return;
mu = myuser_find(pd->name);
if (mu == NULL || strcmp(pd->email, mu->email))
return;
domain = strchr(pd->email, '@');
if (domain == NULL)
return;
domain++;
if (WEXITSTATUS(status) == 1)
{
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slog(LG_INFO, "REGISTER: mxcheck: no A/MX records for %s - "
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"REGISTER failed", domain);
myuser_notice(nicksvs.nick, mu, "Sorry, \2%s\2 does not exist, "
"I can't send mail there. Please check and try again.", domain);
object_unref(mu);
}
else if (WEXITSTATUS(status) == 0)
{
slog(LG_INFO, "REGISTER: mxcheck: valid MX records for %s", domain);
}
}
static void check_registration(hook_user_register_check_t *hdata)
{
char buf[1024];
const char *user;
const char *domain;
int count;
pid_t pid;
struct procdata *pd;
if (hdata->approved)
return;
if (proccount >= MAX_CHILDPROCS)
{
command_fail(hdata->si, fault_toomany, "Sorry, too many registrations in progress. Try again later.");
hdata->approved = 1;
return;
}
switch (pid = fork())
{
case 0: /* child */
connection_close_all_fds();
mowgli_strlcpy(buf, hdata->email, sizeof buf);
user = strtok(buf, "@");
domain = strtok(NULL, "@");
count = count_mx(domain);
if (count <= 0)
{
/* no MX records or error */
struct hostent *host;
/* attempt to resolve host (fallback to A) */
if((host = gethostbyname(domain)) == NULL)
_exit(1);
}
_exit(0);
break;
case -1: /* error */
slog(LG_ERROR, "fork() failed for check_registration(): %s",
strerror(errno));
command_fail(hdata->si, fault_toomany, "Sorry, too many registrations in progress. Try again later.");
hdata->approved = 1;
return;
default: /* parent */
pd = &procdata[proccount++];
mowgli_strlcpy(pd->name, hdata->account, sizeof pd->name);
mowgli_strlcpy(pd->email, hdata->email, sizeof pd->email);
childproc_add(pid, "ns_mxcheck_async", childproc_cb, pd);
return;
}
}
int count_mx (const char *host)
{
u_char nsbuf[4096];
ns_msg amsg;
int l;
l = res_query (host, ns_c_any, ns_t_mx, nsbuf, sizeof (nsbuf));
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if (l < 0)
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{
return 0;
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}
else
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{
ns_initparse (nsbuf, l, &amsg);
l = ns_msg_count (amsg, ns_s_an);
}
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return l;
}
#endif