90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
#include "atheme-compat.h"
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#ifndef _WIN32
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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#include <netdb.h>
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DECLARE_MODULE_V1
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(
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"contrib/ns_mxcheck", false, _modinit, _moddeinit,
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"1.1",
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"Jamie L. Penman-Smithson <jamie@slacked.org>"
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);
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static void check_registration(hook_user_register_check_t *hdata);
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int count_mx (const char *host);
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void _modinit(module_t *m)
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{
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hook_add_event("user_can_register");
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hook_add_user_can_register(check_registration);
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}
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void _moddeinit(module_unload_intent_t intent)
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{
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hook_del_user_can_register(check_registration);
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}
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static void check_registration(hook_user_register_check_t *hdata)
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{
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char buf[1024];
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const char *user;
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const char *domain;
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int count;
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if (hdata->approved)
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return;
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mowgli_strlcpy(buf, hdata->email, sizeof buf);
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user = strtok(buf, "@");
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domain = strtok(NULL, "@");
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count = count_mx(domain);
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if (count > 0)
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{
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/* there are MX records for this domain */
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slog(LG_INFO, "REGISTER: mxcheck: %d MX records for %s", count, domain);
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}
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else
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{
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/* no MX records or error */
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struct hostent *host;
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/* attempt to resolve host (fallback to A) */
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if((host = gethostbyname(domain)) == NULL)
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{
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slog(LG_INFO, "REGISTER: mxcheck: no A/MX records for %s - "
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"REGISTER failed", domain);
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command_fail(hdata->si, fault_noprivs, "Sorry, \2%s\2 does not exist, "
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"I can't send mail there. Please check and try again.", domain);
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hdata->approved = 1;
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return;
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}
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}
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}
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int count_mx (const char *host)
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{
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u_char nsbuf[4096];
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ns_msg amsg;
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int l;
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l = res_query (host, ns_c_any, ns_t_mx, nsbuf, sizeof (nsbuf));
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if (l < 0)
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{
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return 0;
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}
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else
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{
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ns_initparse (nsbuf, l, &amsg);
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l = ns_msg_count (amsg, ns_s_an);
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}
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return l;
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}
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#endif
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