6f17710a |
1 | /**/ |
2 | |
3 | #include "adns-internal.h" |
4 | |
dfdbb32c |
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; |
8 | if (serv>=0) { |
9 | fprintf(stderr,"adns%s: nameserver %s: ",pfx,inet_ntoa(ads->servers[serv].addr)); |
10 | } else { |
11 | fprintf(stderr,"adns%s: ",pfx); |
12 | } |
6f17710a |
13 | vfprintf(stderr,fmt,al); |
14 | fputc('\n',stderr); |
15 | } |
16 | |
dfdbb32c |
17 | void adns__debug(adns_state ads, int serv, const char *fmt, ...) { |
6f17710a |
18 | va_list al; |
19 | |
20 | va_start(al,fmt); |
dfdbb32c |
21 | vdiag(ads," debug",0,serv,fmt,al); |
6f17710a |
22 | va_end(al); |
23 | } |
24 | |
dfdbb32c |
25 | void adns__swarn(adns_state ads, int serv, const char *fmt, ...) { |
26 | va_list al; |
27 | |
28 | va_start(al,fmt); |
29 | vdiag(ads," warning",adns_if_noerrprint|adns_if_noserverwarn,serv,fmt,al); |
30 | va_end(al); |
6f17710a |
31 | } |
32 | |
dfdbb32c |
33 | void adns__diag(adns_state ads, int serv, const char *fmt, ...) { |
6f17710a |
34 | va_list al; |
35 | |
36 | va_start(al,fmt); |
dfdbb32c |
37 | vdiag(ads,"",adns_if_noerrprint,serv,fmt,al); |
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38 | va_end(al); |
39 | } |
40 | |
41 | static void addserver(adns_state ads, struct in_addr addr) { |
42 | int i; |
43 | struct server *ss; |
44 | |
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)); |
48 | return; |
49 | } |
50 | } |
51 | |
52 | if (ads->nservers>=MAXSERVERS) { |
53 | diag(ads,"too many nameservers, ignoring %s",inet_ntoa(addr)); |
54 | return; |
55 | } |
56 | |
57 | ss= ads->servers+ads->nservers; |
58 | ss->addr= addr; |
59 | ss->state= server_disc; |
60 | ss->connw.head= ss->connw.tail= 0; |
61 | ads->nservers++; |
62 | } |
63 | |
64 | static void configparseerr(adns_state ads, const char *fn, int lno, |
65 | const char *fmt, ...) { |
66 | va_list al; |
67 | |
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); |
71 | va_start(al,fmt); |
72 | vfprintf(stderr,fmt,al); |
73 | va_end(al); |
74 | fputc('\n',stderr); |
75 | } |
76 | |
77 | static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) { |
78 | struct in_addr ia; |
79 | |
80 | if (!inet_aton(buf,&ia)) { |
81 | configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf); |
82 | return; |
83 | } |
84 | debug(ads,"using nameserver %s",inet_ntoa(ia)); |
85 | addserver(ads,ia); |
86 | } |
87 | |
88 | static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) { |
89 | if (!buf) return; |
90 | diag(ads,"warning - `search' ignored FIXME"); |
91 | } |
92 | |
93 | static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) { |
94 | diag(ads,"warning - `sortlist' ignored FIXME"); |
95 | } |
96 | |
97 | static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) { |
98 | if (!buf) return; |
99 | diag(ads,"warning - `options' ignored FIXME"); |
100 | } |
101 | |
102 | static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) { |
103 | ads->nservers= 0; |
104 | } |
105 | |
106 | static const struct configcommandinfo { |
107 | const char *name; |
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 }, |
116 | { 0 } |
117 | }; |
118 | |
6f17710a |
119 | static void readconfig(adns_state ads, const char *filename) { |
120 | char linebuf[2000], *p, *q; |
121 | FILE *file; |
122 | int lno, l, c; |
123 | const struct configcommandinfo *ccip; |
124 | |
125 | file= fopen(filename,"r"); |
126 | if (!file) { |
127 | if (errno == ENOENT) { |
128 | debug(ads,"configuration file `%s' does not exist",filename); |
129 | return; |
130 | } |
131 | diag(ads,"cannot open configuration file `%s': %s",filename,strerror(errno)); |
132 | return; |
133 | } |
134 | |
135 | for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) { |
136 | l= strlen(linebuf); |
137 | if (!l) continue; |
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') { } |
141 | if (c == EOF) break; |
142 | continue; |
143 | } |
144 | while (l>0 && ctype_whitespace(linebuf[l-1])) l--; |
145 | linebuf[l]= 0; |
146 | p= linebuf; |
147 | while (ctype_whitespace(*p)) p++; |
148 | if (*p == '#' || *p == '\n') continue; |
149 | q= p; |
150 | while (*q && !ctype_whitespace(*q)) q++; |
151 | for (ccip=configcommandinfos; |
152 | ccip->name && strncmp(ccip->name,p,q-p); |
153 | ccip++); |
154 | if (!ccip->name) { |
155 | diag(ads,"%s:%d: unknown configuration directive `%.*s'",filename,lno,q-p,p); |
156 | continue; |
157 | } |
158 | while (ctype_whitespace(*q)) q++; |
159 | ccip->fn(ads,filename,lno,q); |
160 | } |
161 | if (ferror(file)) { |
162 | diag(ads,"%s:%d: read error: %s",filename,lno,strerror(errno)); |
163 | } |
164 | fclose(file); |
165 | } |
166 | |
167 | static const char *instrum_getenv(adns_state ads, const char *envvar) { |
168 | const char *value; |
169 | |
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); |
173 | return value; |
174 | } |
175 | |
176 | static void readconfigenv(adns_state ads, const char *envvar) { |
177 | const char *filename; |
178 | |
179 | if (ads->iflags & adns_if_noenv) { |
180 | debug(ads,"not checking environment variable `%s'",envvar); |
181 | return; |
182 | } |
183 | filename= instrum_getenv(ads,envvar); |
184 | if (filename) readconfig(ads,filename); |
185 | } |
186 | |
187 | int adns_init(adns_state *ads_r, adns_initflags flags) { |
188 | adns_state ads; |
189 | const char *res_options, *adns_res_options; |
190 | struct protoent *proto; |
191 | int r; |
192 | |
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; |
198 | ads->nextid= 0x311f; |
199 | ads->udpsocket= -1; |
200 | ads->qbufavail= 0; |
201 | ads->qbuf= 0; |
202 | ads->tcpbufavail= ads->tcpbufused= ads->tcpbufdone= 0; |
203 | ads->tcpbuf= 0; |
204 | ads->iflags= flags; |
205 | ads->nservers= 0; |
206 | ads->iflags= flags; |
207 | |
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); |
212 | |
213 | readconfig(ads,"/etc/resolv.conf"); |
214 | readconfigenv(ads,"RES_CONF"); |
215 | readconfigenv(ads,"ADNS_RES_CONF"); |
216 | |
217 | ccf_options(ads,"RES_OPTIONS",-1,res_options); |
218 | ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options); |
219 | |
220 | ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN")); |
221 | ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN")); |
222 | |
223 | if (!ads->nservers) { |
224 | struct in_addr ia; |
225 | if (ads->iflags & adns_if_debug) |
226 | fprintf(stderr,"adns: no nameservers, using localhost\n"); |
227 | ia.s_addr= INADDR_LOOPBACK; |
228 | addserver(ads,ia); |
229 | } |
230 | |
231 | proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; } |
232 | ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto); |
71324651 |
233 | if (ads->udpsocket<0) { r= errno; goto x_free; } |
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234 | |
235 | *ads_r= ads; |
236 | return 0; |
237 | |
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238 | x_free: |
239 | free(ads); |
240 | return r; |
241 | } |
242 | |
243 | int adns_finish(adns_state ads) { |
244 | abort(); /* FIXME */ |
245 | } |