mdw@git.distorted.org.uk Git - adns/blob - src/adns.c

   1 /**/
   2
   3 #include <arpa/nameser.h>
   4
   5 #include "adns-internal.h"
   6
   7 #define LIST_UNLINK(list,node) \
   8   do { \
   9     if ((node)->back) (node)->back->next= (node)->next; \
  10       else                   (list).head= (node)->next; \
  11     if ((node)->next) (node)->next->back= (node)->back; \
  12       else                   (list).tail= (node)->back; \
  13   } while(0)
  14
  15 #define LIST_LINK_TAIL(list,node) \
  16   do { \
  17     (node)->back= 0; \
  18     (node)->next= (list).tail; \
  19     if (list).tail (list).tail->back= (node); else (list).head= (node); \
  20     (list).tail= (node); \
  21   } while(0)
  22
  23 void addserver(adns_state ads, struct in_addr addr) {
  24   if (ads->nservers>=MAXSERVERS) {
  25     if (ads->flags & adns_if_debug)
  26       fprintf(stderr,"adns: too many nameservers, ignoring %s",
  27               inet_ntoa(addr));
  28   } else {
  29     ads->servers[ads->nservers].addr= addr;
  30     ads->servers[ads->nservers].tcpsocket= -1;
  31     ads->nservers++;
  32   }
  33 }
  34
  35 void readconfig(adns_state ads, const char *filename) {
  36 }
  37
  38 void readconfigenv(adns_state ads, const char *envvar) {
  39   const char *filename;
  40
  41   if (flags & adns_if_noenv) return;
  42   filename= getenv(envvar); if (!filename) return;
  43   readconfig(ads,filename);
  44 }
  45
  46 int adns_init(adns_state *ads_r, int flags) {
  47   adns_state ads;
  48   const char *cfile;
  49
  50   ads= malloc(sizeof(*ads)); if (!ads) return errno;
  51   ads->queue.head= ads->queue.tail= 0;
  52   ads->timew.head= ads->timew.tail= 0;
  53   ads->child.head= ads->child.tail= 0;
  54   ads->ready.head= ads->ready.tail= 0;
  55   ads->udpsocket= -1;
  56   ads->qbufavail= 0;
  57   ads->qbuf= 0;
  58   ads->tcpbufavail= ads->tcpbufused= ads->tcpbufdone= 0;
  59   ads->tcpbuf= 0;
  60   ads->flags= flags;
  61   ads->nservers= 0;
  62
  63   readconfig(ads,"/etc/resolv.conf");
  64   readconfigenv(ads,"RES_CONF");
  65   readconfigenv(ads,"ADNS_RES_CONF");
  66   if (!ads->nservers) {
  67     if (ads->flags & adns_if_debug)
  68       fprintf(stderr,"adns: no nameservers, using localhost\n");
  69     addserver(ads,INADDR_LOOPBACK);
  70   }
  71
  72   *ads_r= ads;
  73   return 0;
  74 }
  75
  76 void query_fail(adns_state ads, adns_query qu, ands_status stat) {
  77   struct adns_answer ans;
  78
  79   ans= qu->answer;
  80   if (!ans) ans= malloc(sizeof(*qu->answer));
  81   if (ans) {
  82     ans->status= stat;
  83     ans->cname= 0;
  84     ans->type= qu->type;
  85     ans->nrrs= 0;
  86   }
  87   qu->answer= ans;
  88   LIST_LINK_TAIL(ads.ready,qu);
  89 }
  90
  91 void adns_event(adns_state ads,
  92                 fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
  93                 int *maxfd, struct timeval *tv) {
  94   for (
  95 }
  96
  97 int adns_submit(adns_state ads,
  98                 const char *owner,
  99                 adns_rrtype type,
 100                 int flags,
 101                 void *context,
 102                 adns_query *query_r) {
 103   adns_query qu;
 104   adns_status stat;
 105   int ol, r;
 106
 107   stat= 0;
 108   ol= strlen(owner);
 109   if (ol>MAXDNAME+1) { stat= ands_s_invaliddomain; ol= 0; }
 110   if (ol>0 && owner[ol-1]=='.') { flags &= ~adns_f_search; ol--; }
 111   qu= malloc(sizeof(*qu)+ol+1); if (!qu) return errno;
 112   qu->next= qu->back= qu->parent= qu->child= 0;
 113   qu->type= type;
 114   qu->answer= 0;
 115   qu->flags= flags;
 116   qu->context= context;
 117   qu->retries= 0;
 118   qu->server= 0;
 119   memcpy(qu->owner,owner,ol); qu->owner[ol]= 0;
 120   if (stat) {
 121     query_fail(ads,qu,stat);
 122   } else {
 123     LIST_LINK_TAIL(ads->input,qu);
 124     adns_event(ads,0,0,0,0,0);
 125   }
 126   *query_r= qu;
 127 }