9 #include <arpa/nameser.h>
10 #include <sys/socket.h>
11 #include <netinet/in.h>
12 #include <arpa/inet.h>
14 #include "adns-internal.h"
16 #define LIST_UNLINK(list,node) \
18 if ((node)->back) (node)->back->next= (node)->next; \
19 else (list).head= (node)->next; \
20 if ((node)->next) (node)->next->back= (node)->back; \
21 else (list).tail= (node)->back; \
24 #define LIST_LINK_TAIL(list,node) \
27 (node)->next= (list).tail; \
28 if ((list).tail) (list).tail->back= (node); else (list).head= (node); \
29 (list).tail= (node); \
32 static void vdebug(adns_state ads, const char *fmt, va_list al) {
33 if (!(ads->iflags & adns_if_debug)) return;
34 fputs("adns debug: ",stderr);
35 vfprintf(stderr,fmt,al);
39 static void debug(adns_state ads, const char *fmt, ...) {
47 static void vdiag(adns_state ads, const char *fmt, va_list al) {
48 if (ads->iflags & adns_if_noerrprint) return;
49 fputs("adns: ",stderr);
50 vfprintf(stderr,fmt,al);
54 static void diag(adns_state ads, const char *fmt, ...) {
62 static void addserver(adns_state ads, struct in_addr addr) {
63 if (ads->nservers>=MAXSERVERS) {
64 diag(ads,"too many nameservers, ignoring %s",inet_ntoa(addr));
66 ads->servers[ads->nservers].addr= addr;
67 ads->servers[ads->nservers].tcpsocket= -1;
72 static void configparseerr(adns_state ads, const char *fn, int lno,
73 const char *fmt, ...) {
76 if (ads->iflags & adns_if_noerrprint) return;
77 if (lno==-1) fprintf(stderr,"adns: %s: ",fn);
78 else fprintf(stderr,"adns: %s:%d: ",fn,lno);
80 vfprintf(stderr,fmt,al);
85 static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) {
88 if (!inet_aton(buf,&ia)) {
89 configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
92 debug(ads,"using nameserver %s",inet_ntoa(ia));
96 static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) {
98 diag(ads,"warning - `search' ignored FIXME");
101 static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) {
102 diag(ads,"warning - `sortlist' ignored FIXME");
105 static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) {
107 diag(ads,"warning - `options' ignored FIXME");
110 static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) {
114 static const struct configcommandinfo {
116 void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
117 } configcommandinfos[]= {
118 { "nameserver", ccf_nameserver },
119 { "domain", ccf_search },
120 { "search", ccf_search },
121 { "sortlist", ccf_sortlist },
122 { "options", ccf_options },
123 { "clearnameservers", ccf_clearnss },
127 static int whitespace(int c) {
128 return c==' ' || c=='\n' || c=='\t';
131 static void readconfig(adns_state ads, const char *filename) {
132 char linebuf[2000], *p, *q;
135 const struct configcommandinfo *ccip;
137 file= fopen(filename,"r");
139 if (errno == ENOENT) {
140 debug(ads,"configuration file `%s' does not exist",filename);
143 diag(ads,"cannot open configuration file `%s': %s",filename,strerror(errno));
147 for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) {
150 if (linebuf[l-1] != '\n' && !feof(file)) {
151 diag(ads,"%s:%d: line too long",filename,lno);
152 while ((c= getc(file)) != EOF && c != '\n') { }
156 while (l>0 && whitespace(linebuf[l-1])) l--;
159 while (whitespace(*p)) p++;
160 if (*p == '#' || *p == '\n') continue;
162 while (*q && !whitespace(*q)) q++;
163 for (ccip=configcommandinfos;
164 ccip->name && strncmp(ccip->name,p,q-p);
167 diag(ads,"%s:%d: unknown configuration directive `%.*s'",filename,lno,q-p,p);
170 while (whitespace(*q)) q++;
171 ccip->fn(ads,filename,lno,q);
174 diag(ads,"%s:%d: read error: %s",filename,lno,strerror(errno));
179 static const char *instrum_getenv(adns_state ads, const char *envvar) {
182 value= getenv(envvar);
183 if (!value) debug(ads,"environment variable `%s' not set",envvar);
184 else debug(ads,"environment variable `%s' set to `%s'",envvar,value);
188 static void readconfigenv(adns_state ads, const char *envvar) {
189 const char *filename;
191 if (ads->iflags & adns_if_noenv) {
192 debug(ads,"not checking environment variable `%s'",envvar);
195 filename= instrum_getenv(ads,envvar);
196 if (filename) readconfig(ads,filename);
199 int adns_init(adns_state *ads_r, adns_initflags flags) {
201 const char *res_options, *adns_res_options;
203 ads= malloc(sizeof(*ads)); if (!ads) return errno;
204 ads->input.head= ads->input.tail= 0;
205 ads->timew.head= ads->timew.tail= 0;
206 ads->childw.head= ads->childw.tail= 0;
207 ads->output.head= ads->output.tail= 0;
211 ads->tcpbufavail= ads->tcpbufused= ads->tcpbufdone= 0;
217 res_options= instrum_getenv(ads,"RES_OPTIONS");
218 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
219 ccf_options(ads,"RES_OPTIONS",-1,res_options);
220 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
222 readconfig(ads,"/etc/resolv.conf");
223 readconfigenv(ads,"RES_CONF");
224 readconfigenv(ads,"ADNS_RES_CONF");
226 ccf_options(ads,"RES_OPTIONS",-1,res_options);
227 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
229 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
230 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
232 if (!ads->nservers) {
234 if (ads->iflags & adns_if_debug)
235 fprintf(stderr,"adns: no nameservers, using localhost\n");
236 ia.s_addr= INADDR_LOOPBACK;
244 static void query_fail(adns_state ads, adns_query qu, adns_status stat) {
245 struct adns_answer *ans;
248 if (!ans) ans= malloc(sizeof(*qu->answer));
256 LIST_LINK_TAIL(ads->input,qu);
259 void adns_interest(adns_state ads,
260 fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
261 int *maxfd, struct timeval **tv_io, struct timeval *tvbuf) {
265 int adns_submit(adns_state ads,
270 adns_query *query_r) {
277 if (ol>MAXDNAME+1) { stat= adns_s_invaliddomain; ol= 0; }
278 if (ol>0 && owner[ol-1]=='.') { flags &= ~adns_f_search; ol--; }
279 qu= malloc(sizeof(*qu)+ol+1); if (!qu) return errno;
280 qu->next= qu->back= qu->parent= qu->child= 0;
284 qu->context= context;
287 memcpy(qu->owner,owner,ol); qu->owner[ol]= 0;
289 query_fail(ads,qu,stat);
291 LIST_LINK_TAIL(ads->input,qu);
292 adns_interest(ads,0,0,0,0,0,0);