3 #include "adns-internal.h"
5 void adns__vdiag(adns_state ads, adns_initflags prevent, const char *pfx,
6 int serv, const char *fmt, va_list al) {
7 if (!(ads->iflags & adns_if_debug) && (!prevent || (ads->iflags & prevent))) return;
9 fprintf(stderr,"adns%s: nameserver %s: ",pfx,inet_ntoa(ads->servers[serv].addr));
11 fprintf(stderr,"adns%s: ",pfx);
13 vfprintf(stderr,fmt,al);
17 void adns__debug(adns_state ads, int serv, const char *fmt, ...) {
21 vdiag(ads," debug",0,serv,fmt,al);
25 void adns__swarn(adns_state ads, int serv, const char *fmt, ...) {
29 vdiag(ads," warning",adns_if_noerrprint|adns_if_noserverwarn,serv,fmt,al);
33 void adns__diag(adns_state ads, int serv, const char *fmt, ...) {
37 vdiag(ads,"",adns_if_noerrprint,serv,fmt,al);
41 static void addserver(adns_state ads, struct in_addr addr) {
45 for (i=0; i<ads->nservers; i++) {
46 if (ads->servers[i].addr.s_addr == addr.s_addr) {
47 debug(ads,"duplicate nameserver %s ignored",inet_ntoa(addr));
52 if (ads->nservers>=MAXSERVERS) {
53 diag(ads,"too many nameservers, ignoring %s",inet_ntoa(addr));
57 ss= ads->servers+ads->nservers;
59 ss->state= server_disc;
60 ss->connw.head= ss->connw.tail= 0;
64 static void configparseerr(adns_state ads, const char *fn, int lno,
65 const char *fmt, ...) {
68 if (ads->iflags & adns_if_noerrprint) return;
69 if (lno==-1) fprintf(stderr,"adns: %s: ",fn);
70 else fprintf(stderr,"adns: %s:%d: ",fn,lno);
72 vfprintf(stderr,fmt,al);
77 static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) {
80 if (!inet_aton(buf,&ia)) {
81 configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
84 debug(ads,"using nameserver %s",inet_ntoa(ia));
88 static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) {
90 diag(ads,"warning - `search' ignored FIXME");
93 static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) {
94 diag(ads,"warning - `sortlist' ignored FIXME");
97 static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) {
99 diag(ads,"warning - `options' ignored FIXME");
102 static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) {
106 static const struct configcommandinfo {
108 void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
109 } configcommandinfos[]= {
110 { "nameserver", ccf_nameserver },
111 { "domain", ccf_search },
112 { "search", ccf_search },
113 { "sortlist", ccf_sortlist },
114 { "options", ccf_options },
115 { "clearnameservers", ccf_clearnss },
119 static void readconfig(adns_state ads, const char *filename) {
120 char linebuf[2000], *p, *q;
123 const struct configcommandinfo *ccip;
125 file= fopen(filename,"r");
127 if (errno == ENOENT) {
128 debug(ads,"configuration file `%s' does not exist",filename);
131 diag(ads,"cannot open configuration file `%s': %s",filename,strerror(errno));
135 for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) {
138 if (linebuf[l-1] != '\n' && !feof(file)) {
139 diag(ads,"%s:%d: line too long",filename,lno);
140 while ((c= getc(file)) != EOF && c != '\n') { }
144 while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
147 while (ctype_whitespace(*p)) p++;
148 if (*p == '#' || *p == '\n') continue;
150 while (*q && !ctype_whitespace(*q)) q++;
151 for (ccip=configcommandinfos;
152 ccip->name && strncmp(ccip->name,p,q-p);
155 diag(ads,"%s:%d: unknown configuration directive `%.*s'",filename,lno,q-p,p);
158 while (ctype_whitespace(*q)) q++;
159 ccip->fn(ads,filename,lno,q);
162 diag(ads,"%s:%d: read error: %s",filename,lno,strerror(errno));
167 static const char *instrum_getenv(adns_state ads, const char *envvar) {
170 value= getenv(envvar);
171 if (!value) debug(ads,"environment variable %s not set",envvar);
172 else debug(ads,"environment variable %s set to `%s'",envvar,value);
176 static void readconfigenv(adns_state ads, const char *envvar) {
177 const char *filename;
179 if (ads->iflags & adns_if_noenv) {
180 debug(ads,"not checking environment variable `%s'",envvar);
183 filename= instrum_getenv(ads,envvar);
184 if (filename) readconfig(ads,filename);
187 int adns_init(adns_state *ads_r, adns_initflags flags) {
189 const char *res_options, *adns_res_options;
190 struct protoent *proto;
193 ads= malloc(sizeof(*ads)); if (!ads) return errno;
194 ads->tosend.head= ads->tosend.tail= 0;
195 ads->timew.head= ads->timew.tail= 0;
196 ads->childw.head= ads->childw.tail= 0;
197 ads->output.head= ads->output.tail= 0;
202 ads->tcpbufavail= ads->tcpbufused= ads->tcpbufdone= 0;
208 res_options= instrum_getenv(ads,"RES_OPTIONS");
209 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
210 ccf_options(ads,"RES_OPTIONS",-1,res_options);
211 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
213 readconfig(ads,"/etc/resolv.conf");
214 readconfigenv(ads,"RES_CONF");
215 readconfigenv(ads,"ADNS_RES_CONF");
217 ccf_options(ads,"RES_OPTIONS",-1,res_options);
218 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
220 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
221 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
223 if (!ads->nservers) {
225 if (ads->iflags & adns_if_debug)
226 fprintf(stderr,"adns: no nameservers, using localhost\n");
227 ia.s_addr= INADDR_LOOPBACK;
231 proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
232 ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
233 if (!ads->udpsocket) { r= errno; goto x_closeudp; }
239 close(ads->udpsocket);
245 int adns_finish(adns_state ads) {