3 * - configuration file parsing
4 * - management of global state
7 * This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
31 #include <arpa/inet.h>
35 static void readconfig(adns_state ads, const char *filename);
37 static void addserver(adns_state ads, struct in_addr addr) {
41 for (i=0; i<ads->nservers; i++) {
42 if (ads->servers[i].addr.s_addr == addr.s_addr) {
43 adns__debug(ads,-1,0,"duplicate nameserver %s ignored",inet_ntoa(addr));
48 if (ads->nservers>=MAXSERVERS) {
49 adns__diag(ads,-1,0,"too many nameservers, ignoring %s",inet_ntoa(addr));
53 ss= ads->servers+ads->nservers;
58 static void saveerr(adns_state ads, int en) {
59 if (!ads->configerrno) ads->configerrno= en;
62 static void configparseerr(adns_state ads, const char *fn, int lno,
63 const char *fmt, ...) {
67 if (!ads->diagfile || (ads->iflags & adns_if_noerrprint)) return;
69 if (lno==-1) fprintf(ads->diagfile,"adns: %s: ",fn);
70 else fprintf(ads->diagfile,"adns: %s:%d: ",fn,lno);
72 vfprintf(ads->diagfile,fmt,al);
74 fputc('\n',ads->diagfile);
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 adns__debug(ads,-1,0,"using nameserver %s",inet_ntoa(ia));
88 static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) {
90 adns__diag(ads,-1,0,"warning - `search' ignored fixme");
93 static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) {
94 adns__diag(ads,-1,0,"warning - `sortlist' ignored fixme");
97 static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) {
99 adns__diag(ads,-1,0,"warning - `options' ignored fixme");
102 static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) {
106 static void ccf_include(adns_state ads, const char *fn, int lno, const char *buf) {
108 configparseerr(ads,fn,lno,"`include' directive with no filename");
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 },
124 { "include", ccf_include },
133 static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
134 int lno, char *buf, int buflen) {
135 FILE *file= src_io->file;
143 for (;;) { /* loop over chars */
145 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
150 adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
152 } else if (c == '\n') {
154 } else if (c == EOF) {
157 adns__diag(ads,-1,0,"%s:%d: read error: %s",filename,lno,strerror(errno));
173 while ((c= getc(file)) != EOF && c != '\n');
177 static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
178 int lno, char *buf, int buflen) {
179 const char *cp= src_io->text, *nn;
186 l= nn ? nn-cp : strlen(cp);
187 src_io->text= nn ? nn+1 : 0;
190 adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
200 static void readconfiggeneric(adns_state ads, const char *filename,
201 int (*getline)(adns_state ads, getline_ctx*,
202 const char *filename, int lno,
203 char *buf, int buflen),
204 /* Returns >=0 for success, -1 for EOF or error
205 * (error will have been reported), or -2 for
206 * bad line was encountered, try again.
208 getline_ctx gl_ctx) {
209 char linebuf[2000], *p, *q;
211 const struct configcommandinfo *ccip;
214 (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
216 if (l == -2) continue;
217 while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
220 while (ctype_whitespace(*p)) p++;
221 if (*p == '#' || !*p) continue;
223 while (*q && !ctype_whitespace(*q)) q++;
225 for (ccip=configcommandinfos;
226 ccip->name && !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
229 adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
233 while (ctype_whitespace(*q)) q++;
234 ccip->fn(ads,filename,lno,q);
238 static const char *instrum_getenv(adns_state ads, const char *envvar) {
241 value= getenv(envvar);
242 if (!value) adns__debug(ads,-1,0,"environment variable %s not set",envvar);
243 else adns__debug(ads,-1,0,"environment variable %s set to `%s'",envvar,value);
247 static void readconfig(adns_state ads, const char *filename) {
250 gl_ctx.file= fopen(filename,"r");
252 if (errno == ENOENT) {
253 adns__debug(ads,-1,0,"configuration file `%s' does not exist",filename);
257 adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
258 filename,strerror(errno));
262 readconfiggeneric(ads,filename,gl_file,gl_ctx);
267 static void readconfigtext(adns_state ads, const char *text, const char *showname) {
271 readconfiggeneric(ads,showname,gl_text,gl_ctx);
274 static void readconfigenv(adns_state ads, const char *envvar) {
275 const char *filename;
277 if (ads->iflags & adns_if_noenv) {
278 adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
281 filename= instrum_getenv(ads,envvar);
282 if (filename) readconfig(ads,filename);
286 int adns__setnonblock(adns_state ads, int fd) {
289 r= fcntl(fd,F_GETFL,0); if (r<0) return errno;
291 r= fcntl(fd,F_SETFL,r); if (r<0) return errno;
295 static int init_begin(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
298 ads= malloc(sizeof(*ads)); if (!ads) return errno;
301 ads->diagfile= diagfile;
302 LIST_INIT(ads->timew);
303 LIST_INIT(ads->childw);
304 LIST_INIT(ads->output);
306 ads->udpsocket= ads->tcpsocket= -1;
307 adns__vbuf_init(&ads->tcpsend);
308 adns__vbuf_init(&ads->tcprecv);
309 ads->nservers= ads->tcpserver= 0;
310 ads->tcpstate= server_disconnected;
311 timerclear(&ads->tcptimeout);
317 static int init_finish(adns_state ads) {
319 struct protoent *proto;
322 if (!ads->nservers) {
323 if (ads->diagfile && ads->iflags & adns_if_debug)
324 fprintf(ads->diagfile,"adns: no nameservers, using localhost\n");
325 ia.s_addr= INADDR_LOOPBACK;
329 proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
330 ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
331 if (ads->udpsocket<0) { r= errno; goto x_free; }
333 r= adns__setnonblock(ads,ads->udpsocket);
334 if (r) { r= errno; goto x_closeudp; }
339 close(ads->udpsocket);
345 int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
347 const char *res_options, *adns_res_options;
350 r= init_begin(&ads, flags, diagfile ? diagfile : stderr);
353 res_options= instrum_getenv(ads,"RES_OPTIONS");
354 adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
355 ccf_options(ads,"RES_OPTIONS",-1,res_options);
356 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
358 readconfig(ads,"/etc/resolv.conf");
359 readconfigenv(ads,"RES_CONF");
360 readconfigenv(ads,"ADNS_RES_CONF");
362 ccf_options(ads,"RES_OPTIONS",-1,res_options);
363 ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
365 ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
366 ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
375 int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
376 FILE *diagfile, const char *configtext) {
380 r= init_begin(&ads, flags, diagfile); if (r) return r;
382 readconfigtext(ads,configtext,"<supplied configuration text>");
383 if (ads->configerrno) {
389 r= init_finish(ads); if (r) return r;
394 void adns_finish(adns_state ads) {
396 if (ads->timew.head) adns_cancel(ads->timew.head);
397 else if (ads->childw.head) adns_cancel(ads->childw.head);
398 else if (ads->output.head) adns_cancel(ads->output.head);
401 close(ads->udpsocket);
402 if (ads->tcpsocket >= 0) close(ads->tcpsocket);
403 adns__vbuf_free(&ads->tcpsend);
404 adns__vbuf_free(&ads->tcprecv);