3 #include "adns-internal.h"
5 static void vdebug(adns_state ads, const char *fmt, va_list al) {
6 if (!(ads->iflags & adns_if_debug)) return;
7 fputs("adns debug: ",stderr);
8 vfprintf(stderr,fmt,al);
12 void adns__debug(adns_state ads, const char *fmt, ...) {
20 static void vdiag(adns_state ads, const char *fmt, va_list al) {
21 if (ads->iflags & adns_if_noerrprint) return;
22 fputs("adns: ",stderr);
23 vfprintf(stderr,fmt,al);
27 void adns__diag(adns_state ads, const char *fmt, ...) {
35 static void addserver(adns_state ads, struct in_addr addr) {
39 for (i=0; i<ads->nservers; i++) {
40 if (ads->servers[i].addr.s_addr == addr.s_addr) {
41 debug(ads,"duplicate nameserver %s ignored",inet_ntoa(addr));
46 if (ads->nservers>=MAXSERVERS) {
47 diag(ads,"too many nameservers, ignoring %s",inet_ntoa(addr));
51 ss= ads->servers+ads->nservers;
53 ss->state= server_disc;
54 ss->connw.head= ss->connw.tail= 0;
58 static void configparseerr(adns_state ads, const char *fn, int lno,
59 const char *fmt, ...) {
62 if (ads->iflags & adns_if_noerrprint) return;
63 if (lno==-1) fprintf(stderr,"adns: %s: ",fn);
64 else fprintf(stderr,"adns: %s:%d: ",fn,lno);
66 vfprintf(stderr,fmt,al);
71 static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) {
74 if (!inet_aton(buf,&ia)) {
75 configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf);
78 debug(ads,"using nameserver %s",inet_ntoa(ia));
82 static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) {
84 diag(ads,"warning - `search' ignored FIXME");
87 static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) {
88 diag(ads,"warning - `sortlist' ignored FIXME");
91 static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) {
93 diag(ads,"warning - `options' ignored FIXME");
96 static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) {
100 static const struct configcommandinfo {
102 void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
103 } configcommandinfos[]= {
104 { "nameserver", ccf_nameserver },
105 { "domain", ccf_search },
106 { "search", ccf_search },
107 { "sortlist", ccf_sortlist },
108 { "options", ccf_options },
109 { "clearnameservers", ccf_clearnss },
113 static int ctype_whitespace(int c) { return c==' ' || c=='\n' || c=='\t'; }
114 static int ctype_digit(int c) { return c>='0' && c<='9'; }
116 static void readconfig(adns_state ads, const char *filename) {
117 char linebuf[2000], *p, *q;
120 const struct configcommandinfo *ccip;
122 file= fopen(filename,"r");
124 if (errno == ENOENT) {
125 debug(ads,"configuration file `%s' does not exist",filename);
128 diag(ads,"cannot open configuration file `%s': %s",filename,strerror(errno));
132 for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) {
135 if (linebuf[l-1] != '\n' && !feof(file)) {
136 diag(ads,"%s:%d: line too long",filename,lno);
137 while ((c= getc(file)) != EOF && c != '\n') { }
141 while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
144 while (ctype_whitespace(*p)) p++;
145 if (*p == '#' || *p == '\n') continue;
147 while (*q && !ctype_whitespace(*q)) q++;
148 for (ccip=configcommandinfos;
149 ccip->name && strncmp(ccip->name,p,q-p);
152 diag(ads,"%s:%d: unknown configuration directive `%.*s'",filename,lno,q-p,p);
155 while (ctype_whitespace(*q)) q++;
156 ccip->fn(ads,filename,lno,q);
159 diag(ads,"%s:%d: read error: %s",filename,lno,strerror(errno));
164 static const char *instrum_getenv(adns_state ads, const char *envvar) {
167 value= getenv(envvar);
168 if (!value) debug(ads,"environment variable %s not set",envvar);
169 else debug(ads,"environment variable %s set to `%s'",envvar,value);
173 static void readconfigenv(adns_state ads, const char *envvar) {
174 const char *filename;
176 if (ads->iflags & adns_if_noenv) {
177 debug(ads,"not checking environment variable `%s'",envvar);
180 filename= instrum_getenv(ads,envvar);
181 if (filename) readconfig(ads,filename);
184 int adns_init(adns_state *ads_r, adns_initflags flags) {
186 const char *res_options, *adns_res_options;
187 struct protoent *proto;
190 ads= malloc(sizeof(*ads)); if (!ads) return errno;
191 ads->tosend.head= ads->tosend.tail= 0;
192 ads->timew.head= ads->timew.tail= 0;
193 ads->childw.head= ads->childw.tail= 0;
194 ads->output.head= ads->output.tail= 0;
199 ads->tcpbufavail= ads->tcpbufused= ads->tcpbufdone= 0;
205 res_options= instrum_getenv(ads,"RES_OPTIONS");
206 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
207 ccf_options(ads,"RES_OPTIONS",-1,res_options);
208 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
210 readconfig(ads,"/etc/resolv.conf");
211 readconfigenv(ads,"RES_CONF");
212 readconfigenv(ads,"ADNS_RES_CONF");
214 ccf_options(ads,"RES_OPTIONS",-1,res_options);
215 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
217 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
218 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
220 if (!ads->nservers) {
222 if (ads->iflags & adns_if_debug)
223 fprintf(stderr,"adns: no nameservers, using localhost\n");
224 ia.s_addr= INADDR_LOOPBACK;
228 proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
229 ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
230 if (!ads->udpsocket) { r= errno; goto x_closeudp; }
236 close(ads->udpsocket);
242 int adns_finish(adns_state ads) {