3 #include <arpa/nameser.h>
5 #include "adns-internal.h"
7 #define LIST_UNLINK(list,node) \
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; \
15 #define LIST_LINK_TAIL(list,node) \
18 (node)->next= (list).tail; \
19 if (list).tail (list).tail->back= (node); else (list).head= (node); \
20 (list).tail= (node); \
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",
29 ads->servers[ads->nservers].addr= addr;
30 ads->servers[ads->nservers].tcpsocket= -1;
35 void readconfig(adns_state ads, const char *filename) {
38 void readconfigenv(adns_state ads, const char *envvar) {
41 if (flags & adns_if_noenv) return;
42 filename= getenv(envvar); if (!filename) return;
43 readconfig(ads,filename);
46 int adns_init(adns_state *ads_r, int flags) {
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;
58 ads->tcpbufavail= ads->tcpbufused= ads->tcpbufdone= 0;
63 readconfig(ads,"/etc/resolv.conf");
64 readconfigenv(ads,"RES_CONF");
65 readconfigenv(ads,"ADNS_RES_CONF");
67 if (ads->flags & adns_if_debug)
68 fprintf(stderr,"adns: no nameservers, using localhost\n");
69 addserver(ads,INADDR_LOOPBACK);
76 void query_fail(adns_state ads, adns_query qu, ands_status stat) {
77 struct adns_answer ans;
80 if (!ans) ans= malloc(sizeof(*qu->answer));
88 LIST_LINK_TAIL(ads.ready,qu);
91 void adns_event(adns_state ads,
92 fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
93 int *maxfd, struct timeval *tv) {
97 int adns_submit(adns_state ads,
102 adns_query *query_r) {
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;
116 qu->context= context;
119 memcpy(qu->owner,owner,ol); qu->owner[ol]= 0;
121 query_fail(ads,qu,stat);
123 LIST_LINK_TAIL(ads->input,qu);
124 adns_event(ads,0,0,0,0,0);