#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 <arpa/inet.h>
#include "adns-internal.h"
-
-#define LIST_UNLINK(list,node) \
- 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; \
- } while(0)
-
-#define LIST_LINK_TAIL(list,node) \
- do { \
- (node)->back= 0; \
- (node)->next= (list).tail; \
- if ((list).tail) (list).tail->back= (node); else (list).head= (node); \
- (list).tail= (node); \
- } while(0)
-
-static void vdebug(adns_state ads, const char *fmt, va_list al) {
- if (!(ads->iflags & adns_if_debug)) return;
- fputs("adns debug: ",stderr);
- vfprintf(stderr,fmt,al);
- fputc('\n',stderr);
-}
-
-static void debug(adns_state ads, const char *fmt, ...) {
- va_list al;
-
- va_start(al,fmt);
- vdebug(ads,fmt,al);
- va_end(al);
-}
-
-static void vdiag(adns_state ads, const char *fmt, va_list al) {
- if (ads->iflags & adns_if_noerrprint) return;
- fputs("adns: ",stderr);
- vfprintf(stderr,fmt,al);
- fputc('\n',stderr);
-}
-
-static void diag(adns_state ads, const char *fmt, ...) {
- va_list al;
-
- va_start(al,fmt);
- vdiag(ads,fmt,al);
- va_end(al);
-}
-
-static void addserver(adns_state ads, struct in_addr addr) {
- int i;
-
- 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));
- return;
- }
-
- ads->servers[ads->nservers].addr= addr;
- ads->servers[ads->nservers].tcpsocket= -1;
- ads->nservers++;
-}
-
-static void configparseerr(adns_state ads, const char *fn, int lno,
- const char *fmt, ...) {
- va_list al;
-
- if (ads->iflags & adns_if_noerrprint) return;
- if (lno==-1) fprintf(stderr,"adns: %s: ",fn);
- else fprintf(stderr,"adns: %s:%d: ",fn,lno);
- va_start(al,fmt);
- vfprintf(stderr,fmt,al);
- va_end(al);
- fputc('\n',stderr);
-}
-
-static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) {
- struct in_addr ia;
-
- if (!inet_aton(buf,&ia)) {
- configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
- return;
- }
- debug(ads,"using nameserver %s",inet_ntoa(ia));
- addserver(ads,ia);
-}
-
-static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) {
- if (!buf) return;
- diag(ads,"warning - `search' ignored FIXME");
-}
-
-static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) {
- diag(ads,"warning - `sortlist' ignored FIXME");
-}
-
-static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) {
- if (!buf) return;
- diag(ads,"warning - `options' ignored FIXME");
-}
-
-static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) {
- ads->nservers= 0;
-}
-
-static const struct configcommandinfo {
- const char *name;
- void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
-} configcommandinfos[]= {
- { "nameserver", ccf_nameserver },
- { "domain", ccf_search },
- { "search", ccf_search },
- { "sortlist", ccf_sortlist },
- { "options", ccf_options },
- { "clearnameservers", ccf_clearnss },
- { 0 }
-};
-
-static int whitespace(int c) {
- return c==' ' || c=='\n' || c=='\t';
-}
-
-static void readconfig(adns_state ads, const char *filename) {
- char linebuf[2000], *p, *q;
- FILE *file;
- int lno, l, c;
- const struct configcommandinfo *ccip;
-
- file= fopen(filename,"r");
- if (!file) {
- if (errno == ENOENT) {
- debug(ads,"configuration file `%s' does not exist",filename);
- return;
- }
- diag(ads,"cannot open configuration file `%s': %s",filename,strerror(errno));
- return;
- }
-
- for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) {
- l= strlen(linebuf);
- if (!l) continue;
- if (linebuf[l-1] != '\n' && !feof(file)) {
- diag(ads,"%s:%d: line too long",filename,lno);
- while ((c= getc(file)) != EOF && c != '\n') { }
- if (c == EOF) break;
- continue;
- }
- while (l>0 && whitespace(linebuf[l-1])) l--;
- linebuf[l]= 0;
- p= linebuf;
- while (whitespace(*p)) p++;
- if (*p == '#' || *p == '\n') continue;
- q= p;
- while (*q && !whitespace(*q)) q++;
- for (ccip=configcommandinfos;
- ccip->name && strncmp(ccip->name,p,q-p);
- ccip++);
- if (!ccip->name) {
- diag(ads,"%s:%d: unknown configuration directive `%.*s'",filename,lno,q-p,p);
- continue;
- }
- while (whitespace(*q)) q++;
- ccip->fn(ads,filename,lno,q);
- }
- if (ferror(file)) {
- diag(ads,"%s:%d: read error: %s",filename,lno,strerror(errno));
- }
- fclose(file);
-}
-
-static const char *instrum_getenv(adns_state ads, const char *envvar) {
- 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);
- return value;
-}
-
-static void readconfigenv(adns_state ads, const char *envvar) {
- const char *filename;
-
- if (ads->iflags & adns_if_noenv) {
- debug(ads,"not checking environment variable `%s'",envvar);
- return;
- }
- filename= instrum_getenv(ads,envvar);
- if (filename) readconfig(ads,filename);
-}
-
-int adns_init(adns_state *ads_r, adns_initflags flags) {
- adns_state ads;
- const char *res_options, *adns_res_options;
-
- 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->udpsocket= -1;
- ads->qbufavail= 0;
- ads->qbuf= 0;
- ads->tcpbufavail= ads->tcpbufused= ads->tcpbufdone= 0;
- ads->tcpbuf= 0;
- ads->iflags= flags;
- ads->nservers= 0;
- ads->iflags= flags;
-
- res_options= instrum_getenv(ads,"RES_OPTIONS");
- adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
- ccf_options(ads,"RES_OPTIONS",-1,res_options);
- ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
-
- readconfig(ads,"/etc/resolv.conf");
- readconfigenv(ads,"RES_CONF");
- readconfigenv(ads,"ADNS_RES_CONF");
-
- ccf_options(ads,"RES_OPTIONS",-1,res_options);
- ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
-
- ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
- ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
-
- if (!ads->nservers) {
- struct in_addr ia;
- if (ads->iflags & adns_if_debug)
- fprintf(stderr,"adns: no nameservers, using localhost\n");
- ia.s_addr= INADDR_LOOPBACK;
- addserver(ads,ia);
- }
-
- *ads_r= ads;
- return 0;
-}
-
-static void query_fail(adns_state ads, adns_query qu, adns_status stat) {
- adns_answer *ans;
-
- ans= qu->answer;
- if (!ans) ans= malloc(sizeof(*qu->answer));
- if (ans) {
- ans->status= stat;
- ans->cname= 0;
- ans->type= qu->type;
- ans->nrrs= 0;
- }
- qu->answer= ans;
- LIST_LINK_TAIL(ads->input,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) {
- abort(); /* FIXME */
-}
-
-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;
- 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;
-}
-
-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;
-
- 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);
- }
- *query_r= qu;
- return 0;
-}
~ianmdlvl / adns.git / blobdiff