#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>
#include "adns-internal.h"
-#define LIST_UNLINK(list,node) \
+#define LIST_UNLINK_PART(list,node,part) \
do { \
- if ((node)->back) (node)->back->next= (node)->next; \
- else (list).head= (node)->next; \
- if ((node)->next) (node)->next->back= (node)->back; \
- else (list).tail= (node)->back; \
+ if ((node)->back) (node)->back->part next= (node)->part next; \
+ else (list).head= (node)->part next; \
+ if ((node)->next) (node)->next->part back= (node)->part back; \
+ else (list).tail= (node)->part back; \
} while(0)
-#define LIST_LINK_TAIL(list,node) \
+#define LIST_LINK_TAIL_PART(list,node,part) \
do { \
- (node)->back= 0; \
- (node)->next= (list).tail; \
- if ((list).tail) (list).tail->back= (node); else (list).head= (node); \
+ (node)->part back= 0; \
+ (node)->part next= (list).tail; \
+ if ((list).tail) (list).tail->part back= (node); else (list).part head= (node); \
(list).tail= (node); \
} while(0)
+#define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
+#define LIST_LINK_TAIL_PART(list,node) LIST_LINK_TAIL(list,node,)
+
static void vdebug(adns_state ads, const char *fmt, va_list al) {
if (!(ads->iflags & adns_if_debug)) return;
fputs("adns debug: ",stderr);
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) {
return;
}
- ads->servers[ads->nservers].addr= addr;
- ads->servers[ads->nservers].tcpsocket= -1;
+ ss= ads->servers+ads->nservers;
+ ss->addr= addr;
+ ss->state= server_disc;
+ ss->connw.head= ss->connw.tail= 0;
ads->nservers++;
}
{ 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)) {
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->tosend.head= ads->tosend.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) {
ans->nrrs= 0;
}
qu->answer= ans;
- LIST_LINK_TAIL(ads->input,qu);
+ qu->id= -1;
+ LIST_LINK_TAIL(ads->output,qu);
}
-void adns_interest(adns_state ads, int *maxfd,
- fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
- struct timeval **tv_io, struct timeval *tvbuf) {
+int adns_finish(adns_state ads) {
abort(); /* FIXME */
}
-static void autosys(adns_state ads) {
+static void autosys(adns_state ads, struct timeval now) {
if (ads->iflags & adns_if_noautosys) return;
adns_callback(ads,-1,0,0,0);
}
abort(); /* FIXME */
}
+static void inter_maxto(struct timeval **tv_io, struct timeval *tvbuf,
+ struct timeval maxto) {
+ struct timeval rbuf;
+
+ rbuf= *tv_io;
+ if (!rbuf) { *tvbuf= maxto; *tv_io= tvbuf; return; }
+ if (timercmp(rbuf,&maxto,>)) *rbuf= maxto;
+}
+
+static void inter_maxtoabs(struct timeval **tv_io, struct timeval *tvbuf,
+ struct timeval now, struct timeval maxtime) {
+ ldiv_t dr;
+
+ maxtime.tv_sec -= (now.tv_sec-1);
+ maxtime.tv_usec += (1000-now.tv_usec);
+ dr= ldiv(maxtime.tv_usec,1000);
+ maxtime.tv_sec += dr.quot;
+ maxtime.tv_usec -= dr.rem;
+ inter_maxto(tv_io,tvbuf,maxtime);
+}
+
+static void localresourcerr(struct timeval **tv_io, struct timeval *tvbuf,
+ const char *syscall) {
+ struct timeval tvto_lr;
+
+ diag(ads,"local system resources scarce (during %s): %s",syscall,strerror(errno));
+ timerclear(&tvto_lr); timevaladd(&tvto_lr,LOCALRESOURCEMS);
+ inter_maxto(tv_io, tvbuf, tvto_lr);
+ return;
+}
+
+static inline void timevaladd(struct timeval *tv_io, long ms) {
+ struct timeval tmp;
+ assert(ms>=0);
+ tmp= *tv_io;
+ tmp.tv_usec += (ms%1000)*1000;
+ tmp.tv_sec += ms/1000;
+ if (tmp.tv_usec >= 1000) { tmp.tv_sec++; tmp.tv_usec -= 1000; }
+ *tv_io= tmp;
+}
+
+void adns_interest(adns_state ads, int *maxfd,
+ fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
+ struct timeval **tv_io, struct timeval *tvbuf) {
+ struct timeval now;
+ adns_query qu;
+ int r;
+
+ r= gettimeofday(&now,0);
+ if (r) { localresourcerr(tv_io,tvbuf,"gettimeofday"); return; }
+
+ for (qu= ads->timew; qu; qu= nqu) {
+ nqu= qu->next;
+ if (timercmp(&now,qu->timeout,>)) {
+ DLIST_UNLINK(ads->timew,qu);
+ if (qu->nextudpserver == -1) {
+ query_fail(ads,qu,adns_s_notresponding);
+ } else {
+ DLIST_LINKTAIL(ads->tosend,qu);
+ }
+ } else {
+ inter_maxtoabs(tv_io,tvbuf,now,qu->timeout);
+ }
+ }
+
+ for (qu= ads->tosend; qu; qu= nqu) {
+ nqu= qu->next;
+ quproc_tosend(ads,qu,now);
+ }
+
+ for (qu= ads->timew; qu; qu= qu->next) {
+ if (qu->sentudp) {
+ inter_addfd(maxfd,readfds,ads->udpsocket);
+ break;
+ }
+ }
+ switch (ads->tcpstate) {
+ case server_disc:
+ break;
+ case server_connecting:
+ inter_addfd(maxfd,readfds,ads->tcpsocket);
+ inter_addfd(maxfd,writefds,ads->tcpsocket);
+ inter_addfd(maxfd,exceptfds,ads->tcpsocket);
+ break;
+ case server_connected:
+ inter_addfd(maxfd,readfds,ads->tcpsocket);
+ inter_addfd(maxfd,exceptfds,ads->tcpsocket);
+ if (ads->opbufused) inter_addfd(maxfd,writefds,ads->tcpsocket);
+ default:
+ abort();
+ }
+
+}
+
static int internal_check(adns_state ads,
adns_query *query_io,
- adns_answer *answer,
- void *context_r) {
- abort(); /* FIXME */
+ adns_answer **answer,
+ void **context_r) {
+ adns_query qu;
+
+ qu= *query_io;
+ if (!qu) {
+ if (!ads->output.head) return EWOULDBLOCK;
+ qu= ads->output.head;
+ } else {
+ if (qu->id>=0) return EWOULDBLOCK;
+ }
+ LIST_UNLINK(ads->output,qu);
+ *answer= qu->answer;
+ if (context_r) *context_r= qu->context;
+ free(qu);
+ return 0;
}
int adns_wait(adns_state ads,
adns_query *query_io,
- adns_answer *answer,
- void *context_r) {
+ adns_answer **answer_r,
+ 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);
+ r= internal_check(ads,query_io,answer_r,context_r);
if (r && r != EWOULDBLOCK) return r;
FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds);
maxfd= 0; tvp= 0;
int adns_check(adns_state ads,
adns_query *query_io,
- adns_answer *answer,
- void *context_r) {
+ adns_answer **answer_r,
+ void **context_r) {
autosys(ads);
- return internal_check(ads,query_io,answer,context_r);
+ return internal_check(ads,query_io,answer_r,context_r);
}
int adns_synchronous(adns_state ads,
const char *owner,
adns_rrtype type,
- int flags,
- adns_answer *answer) {
+ adns_queryflags flags,
+ adns_answer **answer_r) {
adns_query qu;
int r;
r= adns_submit(ads,owner,type,flags,0,&qu);
if (r) return r;
- r= adns_wait(ads,&qu,answer,0);
+ do {
+ r= adns_wait(ads,&qu,answer_r,0);
+ } while (r==EINTR);
if (r) adns_cancel(ads,qu);
return r;
}
+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= 0;
+ qu->children.head= qu->children.tail= 0;
+ qu->siblings.next= qu->siblings.back= 0;
+ qu->id= id;
+ qu->type= type;
+ qu->answer= 0;
+ qu->flags= flags;
+ qu->context= context;
+ qu->udpretries= 0;
+ qu->sentudp= qu->senttcp= 0;
+ qu->nextserver= 0;
+ memcpy(qu->owner,owner,ol); qu->owner[ol]= 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;
+}
+
+static void quproc_tosend(adns_state ads, adns_query qu, struct timeval now) {
+ /* Query must be on the `tosend' queue, and guarantees to remove it. */
+ struct sockaddr_in servaddr;
+ int serv;
+
+ if (qu->nextudpserver != -1) {
+ if (qu->udpretries >= UDPMAXRETRIES) {
+ DLIST_UNLINK(ads->tosend,qu);
+ query_fail(ads,qu,adns_s_notresponding);
+ return;
+ }
+ serv= qu->nextudpserver;
+ memset(&servaddr,0,sizeof(servaddr));
+ servaddr.sin_family= AF_INET;
+ servaddr.sin_addr= ads->servers[serv].addr;
+ servaddr.sin_port= htons(53);
+ r= sendto(ads->udpsocket,qu->querymsg,qu->querylen,0,&servaddr,sizeof(servaddr));
+ if (r<0 && errno == EMSGSIZE) {
+ qu->nextudpserver= -1;
+ } else {
+ if (r<0) {
+ diag("sendto %s failed: %s",inet_ntoa(servaddr.sin_addr),strerror(errno));
+ }
+ DLIST_UNLINK(ads->tosend,qu);
+ timevaladd(&now,UDPRETRYMS);
+ qu->timeout= now;
+ qu->sentudp |= (1<<serv);
+ qu->nextudpserver= (serv+1)%ads->nservers;
+ qu->udpretries++;
+ DLIST_LINKTAIL(ads->timew,qu);
+ return;
+ }
+ }
+
+ for (;;) {
+ serv= tcpserver_get(ads);
+ if (serv<0) { r=0; break; }
+ if (ads->opbufused) { r=0; break; }
+ r= write(ads->tcpsocket,qu->querymsg,qu->querylen);
+ if (r >= 0) break;
+ if (errno == EAGAIN || errno == EINTR || errno == ENOSPC ||
+ errno == ENOBUFS || errno == ENOMEM) {
+ r= 0; break;
+ }
+ tcpserver_broken(serv);
+ }
+ if (r < qu->querylen) {
+ newopbufused= qu->opbufused + (qu->querylen-r);
+ if (newopbufused > ads->opbufavail) {
+ newopbufavail= ads->newopbufused<<1;
+ newopbuf= realloc(newopbufavail);
+ if (!newopbuf) {
+ DLIST_UNLINK(ads->tosend,qu);
+ query_fail(ads,qu,adns_s_nolocalmem);
+ return;
+ }
+ ads->opbuf= newopbuf;
+ ads->opbufavail= newopbufavail;
+ }
+ memcpy(ads->opbuf+ads->opbufused,qu->querymsg+r,qu->querylen-r);
+ ads->opbufused= newopbufused;
+ }
+ DLIST_UNLINK(ads->tosend,qu);
+ timevaladd(&now,TCPMS);
+ qu->timeout= now;
+ qu->senttcp |= (1<<qu->nextserver);
+ DLIST_LINKTAIL(ads->timew,qu);
+}
+
int adns_submit(adns_state ads,
const char *owner,
adns_rrtype type,
- int flags,
+ adns_queryflags flags,
void *context,
adns_query *query_r) {
adns_query qu;
adns_status stat;
- int ol;
+ int ol, id, qml;
+
+ id= ads->nextid++;
- 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;
- qu->next= qu->back= qu->parent= qu->child= 0;
- qu->type= type;
- qu->answer= 0;
- qu->flags= flags;
- qu->context= context;
- qu->udpretries= 0;
- qu->server= 0;
- memcpy(qu->owner,owner,ol); qu->owner[ol]= 0;
- if (stat) {
- query_fail(ads,qu,stat);
- } else {
- LIST_LINK_TAIL(ads->input,qu);
- autosys(ads);
- }
+ 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;
+ if (qu->flags & adns_f_usevc) qu->udpretries= -1;
+ LIST_LINK_TAIL(ads->tosend,qu);
+
+ r= gettimeofday(&now,0); if (r) return;
+ quproc_tosend(ads,qu,now);
+ autosys(ads,now);
+
*query_r= qu;
return 0;
}
~ianmdlvl / adns.git / blobdiff