X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git;a=blobdiff_plain;f=src%2Fadns.c;h=6c4a7cfb47f0b57c78044da6b2d4ac9eb1f2e154;hp=cea597ee2d48ccb903505cb76e5f53805bdd0299;hb=8402e34c7df0adad223cf1fa1328bb524a15d99f;hpb=72934832416660b35dbdc62b6294c1ffdf65d015 diff --git a/src/adns.c b/src/adns.c index cea597e..6c4a7cf 100644 --- a/src/adns.c +++ b/src/adns.c @@ -6,371 +6,12 @@ #include #include #include +#include +#include #include #include #include #include #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; inservers; 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; -}