#include <errno.h>
#include <string.h>
#include <stdlib.h>
+#include <assert.h>
+#include <unistd.h>
+#include <netdb.h>
#include <arpa/nameser.h>
#include <sys/socket.h>
#include <netinet/in.h>
}
static void addserver(adns_state ads, struct in_addr addr) {
+ int i;
+ struct server *ss;
+
+ for (i=0; i<ads->nservers; i++) {
+ if (ads->servers[i].addr.s_addr == addr.s_addr) {
+ debug(ads,"duplicate nameserver %s ignored",inet_ntoa(addr));
+ return;
+ }
+ }
+
if (ads->nservers>=MAXSERVERS) {
diag(ads,"too many nameservers, ignoring %s",inet_ntoa(addr));
- } else {
- ads->servers[ads->nservers].addr= addr;
- ads->servers[ads->nservers].tcpsocket= -1;
- ads->nservers++;
+ return;
}
+
+ ss= ads->servers+ads->nservers;
+ ss->addr= addr;
+ ss->state= server_disc;
+ ss->connw.head= ss->connw.tail= 0;
+ ads->nservers++;
}
static void configparseerr(adns_state ads, const char *fn, int lno,
{ 0 }
};
-static int whitespace(int c) {
- return c==' ' || c=='\n' || c=='\t';
-}
+static int ctype_whitespace(int c) { return c==' ' || c=='\n' || c=='\t'; }
+static int ctype_digit(int c) { return c>='0' && c<='9'; }
static void readconfig(adns_state ads, const char *filename) {
char linebuf[2000], *p, *q;
if (c == EOF) break;
continue;
}
- while (l>0 && whitespace(linebuf[l-1])) l--;
+ while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
linebuf[l]= 0;
p= linebuf;
- while (whitespace(*p)) p++;
+ while (ctype_whitespace(*p)) p++;
if (*p == '#' || *p == '\n') continue;
q= p;
- while (*q && !whitespace(*q)) q++;
+ while (*q && !ctype_whitespace(*q)) q++;
for (ccip=configcommandinfos;
ccip->name && strncmp(ccip->name,p,q-p);
ccip++);
diag(ads,"%s:%d: unknown configuration directive `%.*s'",filename,lno,q-p,p);
continue;
}
- while (whitespace(*q)) q++;
+ while (ctype_whitespace(*q)) q++;
ccip->fn(ads,filename,lno,q);
}
if (ferror(file)) {
const char *value;
value= getenv(envvar);
- if (!value) debug(ads,"environment variable `%s' not set",envvar);
- else debug(ads,"environment variable `%s' set to `%s'",envvar,value);
+ if (!value) debug(ads,"environment variable %s not set",envvar);
+ else debug(ads,"environment variable %s set to `%s'",envvar,value);
return value;
}
int adns_init(adns_state *ads_r, adns_initflags flags) {
adns_state ads;
const char *res_options, *adns_res_options;
+ struct protoent *proto;
+ int r;
ads= malloc(sizeof(*ads)); if (!ads) return errno;
ads->input.head= ads->input.tail= 0;
ads->timew.head= ads->timew.tail= 0;
ads->childw.head= ads->childw.tail= 0;
ads->output.head= ads->output.tail= 0;
+ ads->nextid= 0x311f;
ads->udpsocket= -1;
ads->qbufavail= 0;
ads->qbuf= 0;
ia.s_addr= INADDR_LOOPBACK;
addserver(ads,ia);
}
+
+ proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
+ ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
+ if (!ads->udpsocket) { r= errno; goto x_closeudp; }
*ads_r= ads;
return 0;
+
+ x_closeudp:
+ close(ads->udpsocket);
+ x_free:
+ free(ads);
+ return r;
}
static void query_fail(adns_state ads, adns_query qu, adns_status stat) {
- struct adns_answer *ans;
+ adns_answer *ans;
ans= qu->answer;
if (!ans) ans= malloc(sizeof(*qu->answer));
LIST_LINK_TAIL(ads->input,qu);
}
-void adns_interest(adns_state ads,
+int adns_finish(adns_state ads) {
+ abort(); /* FIXME */
+}
+
+void adns_interest(adns_state ads, int *maxfd,
fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
- int *maxfd, struct timeval **tv_io, struct timeval *tvbuf) {
+ struct timeval **tv_io, struct timeval *tvbuf) {
abort(); /* FIXME */
}
-int adns_submit(adns_state ads,
- const char *owner,
- adns_rrtype type,
- int flags,
- void *context,
- adns_query *query_r) {
+static void autosys(adns_state ads) {
+ if (ads->iflags & adns_if_noautosys) return;
+ adns_callback(ads,-1,0,0,0);
+}
+
+void adns_cancel(adns_state ads, adns_query query) {
+ abort(); /* FIXME */
+}
+
+int adns_callback(adns_state ads, int maxfd,
+ const fd_set *readfds, const fd_set *writefds,
+ const fd_set *exceptfds) {
+ abort(); /* FIXME */
+}
+
+static int internal_check(adns_state ads,
+ adns_query *query_io,
+ adns_answer *answer,
+ void *context_r) {
+ abort(); /* FIXME */
+}
+
+int adns_wait(adns_state ads,
+ adns_query *query_io,
+ adns_answer *answer,
+ void *context_r) {
+ int r, maxfd, rsel, rcb;
+ fd_set readfds, writefds, exceptfds;
+ struct timeval tvbuf, *tvp;
+
+ for (;;) {
+ r= internal_check(ads,query_io,answer,context_r);
+ if (r && r != EWOULDBLOCK) return r;
+ FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds);
+ maxfd= 0; tvp= 0;
+ adns_interest(ads,&maxfd,&readfds,&writefds,&exceptfds,&tvp,&tvbuf);
+ rsel= select(maxfd,&readfds,&writefds,&exceptfds,tvp);
+ if (rsel==-1) return r;
+ rcb= adns_callback(ads,maxfd,&readfds,&writefds,&exceptfds);
+ assert(rcb==rsel);
+ }
+}
+
+int adns_check(adns_state ads,
+ adns_query *query_io,
+ adns_answer *answer,
+ void *context_r) {
+ autosys(ads);
+ return internal_check(ads,query_io,answer,context_r);
+}
+
+int adns_synchronous(adns_state ads,
+ const char *owner,
+ adns_rrtype type,
+ adns_queryflags flags,
+ adns_answer *answer) {
adns_query qu;
- adns_status stat;
- int ol;
+ int r;
+
+ r= adns_submit(ads,owner,type,flags,0,&qu);
+ if (r) return r;
+
+ do {
+ r= adns_wait(ads,&qu,answer,0);
+ } while (r==EINTR);
+ if (r) adns_cancel(ads,qu);
+ return r;
+}
- stat= 0;
- ol= strlen(owner);
- if (ol>MAXDNAME+1) { stat= adns_s_invaliddomain; ol= 0; }
- if (ol>0 && owner[ol-1]=='.') { flags &= ~adns_f_search; ol--; }
- qu= malloc(sizeof(*qu)+ol+1); if (!qu) return errno;
+static adns_status mkquery(adns_state ads, const char *owner, int ol, int id,
+ adns_rrtype type, adns_queryflags flags, int *qml_r) {
+ int ll, c, nlabs, qbufreq;
+ unsigned char label[255], *nqbuf;
+ const char *p, *pe;
+
+#define MKQUERY_ADDB(b) *nqbuf++= (b)
+#define MKQUERY_ADDW(w) (MKQUERY_ADDB(((w)>>8)&0x0ff), MKQUERY_ADDB((w)&0x0ff))
+
+ qbufreq= 12+strlen(owner)+3;
+ if (ads->qbufavail < qbufreq) {
+ nqbuf= realloc(ads->qbuf,qbufreq);
+ if (!nqbuf) return adns_s_nolocalmem;
+ ads->qbuf= nqbuf; ads->qbufavail= qbufreq;
+ }
+ nqbuf= ads->qbuf;
+
+ MKQUERY_ADDW(id);
+ MKQUERY_ADDB(0x01); /* QR=Q(0), OPCODE=QUERY(0000), !AA, !TC, RD */
+ MKQUERY_ADDB(0x00); /* !RA, Z=000, RCODE=NOERROR(0000) */
+ MKQUERY_ADDW(1); /* QDCOUNT=1 */
+ MKQUERY_ADDW(0); /* ANCOUNT=0 */
+ MKQUERY_ADDW(0); /* NSCOUNT=0 */
+ MKQUERY_ADDW(0); /* ARCOUNT=0 */
+ p= owner; pe= owner+ol;
+ nlabs= 0;
+ if (!*p) return adns_s_invaliddomain;
+ do {
+ ll= 0;
+ while (p!=pe && (c= *p++)!='.') {
+ if (c=='\\') {
+ if (!(flags & adns_f_anyquote)) return adns_s_invaliddomain;
+ if (ctype_digit(p[0])) {
+ if (ctype_digit(p[1]) && ctype_digit(p[2])) {
+ c= (*p++ - '0')*100 + (*p++ - '0')*10 + (*p++ - '0');
+ if (c >= 256) return adns_s_invaliddomain;
+ } else {
+ return adns_s_invaliddomain;
+ }
+ } else if (!(c= *p++)) {
+ return adns_s_invaliddomain;
+ }
+ }
+ if (!(flags & adns_f_anyquote)) {
+ if ((c >= '0' && c <= '9') || c == '-') {
+ if (!ll) return adns_s_invaliddomain;
+ } else if ((c < 'a' || c > 'z') && (c < 'A' && c > 'Z')) {
+ return adns_s_invaliddomain;
+ }
+ }
+ if (ll == sizeof(label)) return adns_s_invaliddomain;
+ label[ll++]= c;
+ }
+ if (!ll) return adns_s_invaliddomain;
+ if (nlabs++ > 63) return adns_s_invaliddomain;
+ MKQUERY_ADDB(ll);
+ memcpy(nqbuf,label,ll); nqbuf+= ll;
+ } while (p!=pe);
+
+ MKQUERY_ADDB(0);
+ MKQUERY_ADDW(type & adns__rrt_typemask); /* QTYPE */
+ MKQUERY_ADDW(1); /* QCLASS=IN */
+
+ *qml_r= nqbuf - ads->qbuf;
+
+ return adns_s_ok;
+}
+
+static adns_query allocquery(adns_state ads, const char *owner, int ol,
+ int qml, int id, adns_rrtype type,
+ adns_queryflags flags, void *context) {
+ adns_query qu;
+ unsigned char *qm;
+
+ qu= malloc(sizeof(*qu)+ol+1+qml); if (!qu) return 0;
qu->next= qu->back= qu->parent= qu->child= 0;
+ qu->id= id;
qu->type= type;
qu->answer= 0;
qu->flags= flags;
qu->context= context;
qu->udpretries= 0;
- qu->server= 0;
+ qu->sentudp= qu->senttcp= 0;
+ qu->nextserver= 0;
memcpy(qu->owner,owner,ol); qu->owner[ol]= 0;
- if (stat) {
- query_fail(ads,qu,stat);
- } else {
- LIST_LINK_TAIL(ads->input,qu);
- adns_interest(ads,0,0,0,0,0,0);
- }
+ qu->querymsg= qm= qu->owner+ol+1;
+ memcpy(qm,ads->qbuf,qml);
+ qu->querylen= qml;
+ return qu;
+}
+
+static int failsubmit(adns_state ads, void *context, adns_query *query_r,
+ adns_rrtype type, adns_queryflags flags,
+ int id, adns_status stat) {
+ adns_query qu;
+
+ qu= allocquery(ads,0,0,0,id,type,flags,context); if (!qu) return errno;
+ query_fail(ads,qu,stat);
*query_r= qu;
+ return 0;
+}
- abort(); /* FIXME */
+int adns_submit(adns_state ads,
+ const char *owner,
+ adns_rrtype type,
+ adns_queryflags flags,
+ void *context,
+ adns_query *query_r) {
+ adns_query qu;
+ adns_status stat;
+ int ol, id, qml;
+
+ id= ads->nextid++;
+
+ ol= strlen(owner);
+ if (ol<=1 || ol>MAXDNAME+1)
+ return failsubmit(ads,context,query_r,type,flags,id,adns_s_invaliddomain);
+ if (owner[ol-1]=='.' && owner[ol-2]!='\\') { flags &= ~adns_f_search; ol--; }
+
+ stat= mkquery(ads,owner,ol,id,type,flags,&qml);
+ if (stat) return failsubmit(ads,context,query_r,type,flags,id,stat);
+
+ qu= allocquery(ads,owner,ol,qml,id,type,flags,context); if (!qu) return errno;
+
+ LIST_LINK_TAIL(ads->input,qu);
+ autosys(ads);
+
+ *query_r= qu;
+ return 0;
}
~ianmdlvl / adns.git / blobdiff