| 1 | /**/ |
| 2 | |
| 3 | #include "adns-internal.h" |
| 4 | |
| 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); |
| 9 | fputc('\n',stderr); |
| 10 | } |
| 11 | |
| 12 | void adns__debug(adns_state ads, const char *fmt, ...) { |
| 13 | va_list al; |
| 14 | |
| 15 | va_start(al,fmt); |
| 16 | vdebug(ads,fmt,al); |
| 17 | va_end(al); |
| 18 | } |
| 19 | |
| 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); |
| 24 | fputc('\n',stderr); |
| 25 | } |
| 26 | |
| 27 | void adns__diag(adns_state ads, const char *fmt, ...) { |
| 28 | va_list al; |
| 29 | |
| 30 | va_start(al,fmt); |
| 31 | vdiag(ads,fmt,al); |
| 32 | va_end(al); |
| 33 | } |
| 34 | |
| 35 | static void addserver(adns_state ads, struct in_addr addr) { |
| 36 | int i; |
| 37 | struct server *ss; |
| 38 | |
| 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)); |
| 42 | return; |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | if (ads->nservers>=MAXSERVERS) { |
| 47 | diag(ads,"too many nameservers, ignoring %s",inet_ntoa(addr)); |
| 48 | return; |
| 49 | } |
| 50 | |
| 51 | ss= ads->servers+ads->nservers; |
| 52 | ss->addr= addr; |
| 53 | ss->state= server_disc; |
| 54 | ss->connw.head= ss->connw.tail= 0; |
| 55 | ads->nservers++; |
| 56 | } |
| 57 | |
| 58 | static void configparseerr(adns_state ads, const char *fn, int lno, |
| 59 | const char *fmt, ...) { |
| 60 | va_list al; |
| 61 | |
| 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); |
| 65 | va_start(al,fmt); |
| 66 | vfprintf(stderr,fmt,al); |
| 67 | va_end(al); |
| 68 | fputc('\n',stderr); |
| 69 | } |
| 70 | |
| 71 | static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) { |
| 72 | struct in_addr ia; |
| 73 | |
| 74 | if (!inet_aton(buf,&ia)) { |
| 75 | configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf); |
| 76 | return; |
| 77 | } |
| 78 | debug(ads,"using nameserver %s",inet_ntoa(ia)); |
| 79 | addserver(ads,ia); |
| 80 | } |
| 81 | |
| 82 | static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) { |
| 83 | if (!buf) return; |
| 84 | diag(ads,"warning - `search' ignored FIXME"); |
| 85 | } |
| 86 | |
| 87 | static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) { |
| 88 | diag(ads,"warning - `sortlist' ignored FIXME"); |
| 89 | } |
| 90 | |
| 91 | static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) { |
| 92 | if (!buf) return; |
| 93 | diag(ads,"warning - `options' ignored FIXME"); |
| 94 | } |
| 95 | |
| 96 | static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) { |
| 97 | ads->nservers= 0; |
| 98 | } |
| 99 | |
| 100 | static const struct configcommandinfo { |
| 101 | const char *name; |
| 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 }, |
| 110 | { 0 } |
| 111 | }; |
| 112 | |
| 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'; } |
| 115 | |
| 116 | static void readconfig(adns_state ads, const char *filename) { |
| 117 | char linebuf[2000], *p, *q; |
| 118 | FILE *file; |
| 119 | int lno, l, c; |
| 120 | const struct configcommandinfo *ccip; |
| 121 | |
| 122 | file= fopen(filename,"r"); |
| 123 | if (!file) { |
| 124 | if (errno == ENOENT) { |
| 125 | debug(ads,"configuration file `%s' does not exist",filename); |
| 126 | return; |
| 127 | } |
| 128 | diag(ads,"cannot open configuration file `%s': %s",filename,strerror(errno)); |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) { |
| 133 | l= strlen(linebuf); |
| 134 | if (!l) continue; |
| 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') { } |
| 138 | if (c == EOF) break; |
| 139 | continue; |
| 140 | } |
| 141 | while (l>0 && ctype_whitespace(linebuf[l-1])) l--; |
| 142 | linebuf[l]= 0; |
| 143 | p= linebuf; |
| 144 | while (ctype_whitespace(*p)) p++; |
| 145 | if (*p == '#' || *p == '\n') continue; |
| 146 | q= p; |
| 147 | while (*q && !ctype_whitespace(*q)) q++; |
| 148 | for (ccip=configcommandinfos; |
| 149 | ccip->name && strncmp(ccip->name,p,q-p); |
| 150 | ccip++); |
| 151 | if (!ccip->name) { |
| 152 | diag(ads,"%s:%d: unknown configuration directive `%.*s'",filename,lno,q-p,p); |
| 153 | continue; |
| 154 | } |
| 155 | while (ctype_whitespace(*q)) q++; |
| 156 | ccip->fn(ads,filename,lno,q); |
| 157 | } |
| 158 | if (ferror(file)) { |
| 159 | diag(ads,"%s:%d: read error: %s",filename,lno,strerror(errno)); |
| 160 | } |
| 161 | fclose(file); |
| 162 | } |
| 163 | |
| 164 | static const char *instrum_getenv(adns_state ads, const char *envvar) { |
| 165 | const char *value; |
| 166 | |
| 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); |
| 170 | return value; |
| 171 | } |
| 172 | |
| 173 | static void readconfigenv(adns_state ads, const char *envvar) { |
| 174 | const char *filename; |
| 175 | |
| 176 | if (ads->iflags & adns_if_noenv) { |
| 177 | debug(ads,"not checking environment variable `%s'",envvar); |
| 178 | return; |
| 179 | } |
| 180 | filename= instrum_getenv(ads,envvar); |
| 181 | if (filename) readconfig(ads,filename); |
| 182 | } |
| 183 | |
| 184 | int adns_init(adns_state *ads_r, adns_initflags flags) { |
| 185 | adns_state ads; |
| 186 | const char *res_options, *adns_res_options; |
| 187 | struct protoent *proto; |
| 188 | int r; |
| 189 | |
| 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; |
| 195 | ads->nextid= 0x311f; |
| 196 | ads->udpsocket= -1; |
| 197 | ads->qbufavail= 0; |
| 198 | ads->qbuf= 0; |
| 199 | ads->tcpbufavail= ads->tcpbufused= ads->tcpbufdone= 0; |
| 200 | ads->tcpbuf= 0; |
| 201 | ads->iflags= flags; |
| 202 | ads->nservers= 0; |
| 203 | ads->iflags= flags; |
| 204 | |
| 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); |
| 209 | |
| 210 | readconfig(ads,"/etc/resolv.conf"); |
| 211 | readconfigenv(ads,"RES_CONF"); |
| 212 | readconfigenv(ads,"ADNS_RES_CONF"); |
| 213 | |
| 214 | ccf_options(ads,"RES_OPTIONS",-1,res_options); |
| 215 | ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options); |
| 216 | |
| 217 | ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN")); |
| 218 | ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN")); |
| 219 | |
| 220 | if (!ads->nservers) { |
| 221 | struct in_addr ia; |
| 222 | if (ads->iflags & adns_if_debug) |
| 223 | fprintf(stderr,"adns: no nameservers, using localhost\n"); |
| 224 | ia.s_addr= INADDR_LOOPBACK; |
| 225 | addserver(ads,ia); |
| 226 | } |
| 227 | |
| 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; } |
| 231 | |
| 232 | *ads_r= ads; |
| 233 | return 0; |
| 234 | |
| 235 | x_closeudp: |
| 236 | close(ads->udpsocket); |
| 237 | x_free: |
| 238 | free(ads); |
| 239 | return r; |
| 240 | } |
| 241 | |
| 242 | int adns_finish(adns_state ads) { |
| 243 | abort(); /* FIXME */ |
| 244 | } |