| 1 | /**/ |
| 2 | |
| 3 | #include <stdlib.h> |
| 4 | #include <errno.h> |
| 5 | #include <string.h> |
| 6 | #include <unistd.h> |
| 7 | #include <fcntl.h> |
| 8 | |
| 9 | #include <netdb.h> |
| 10 | #include <arpa/inet.h> |
| 11 | |
| 12 | #include "internal.h" |
| 13 | |
| 14 | void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent, |
| 15 | int serv, const char *fmt, va_list al) { |
| 16 | if (!(ads->iflags & adns_if_debug) && (!prevent || (ads->iflags & prevent))) return; |
| 17 | if (serv>=0) { |
| 18 | fprintf(stderr,"adns%s: nameserver %s: ",pfx,inet_ntoa(ads->servers[serv].addr)); |
| 19 | } else { |
| 20 | fprintf(stderr,"adns%s: ",pfx); |
| 21 | } |
| 22 | vfprintf(stderr,fmt,al); |
| 23 | fputc('\n',stderr); |
| 24 | } |
| 25 | |
| 26 | void adns__debug(adns_state ads, int serv, const char *fmt, ...) { |
| 27 | va_list al; |
| 28 | |
| 29 | va_start(al,fmt); |
| 30 | adns__vdiag(ads," debug",0,serv,fmt,al); |
| 31 | va_end(al); |
| 32 | } |
| 33 | |
| 34 | void adns__warn(adns_state ads, int serv, const char *fmt, ...) { |
| 35 | va_list al; |
| 36 | |
| 37 | va_start(al,fmt); |
| 38 | adns__vdiag(ads," warning",adns_if_noerrprint|adns_if_noserverwarn,serv,fmt,al); |
| 39 | va_end(al); |
| 40 | } |
| 41 | |
| 42 | void adns__diag(adns_state ads, int serv, const char *fmt, ...) { |
| 43 | va_list al; |
| 44 | |
| 45 | va_start(al,fmt); |
| 46 | adns__vdiag(ads,"",adns_if_noerrprint,serv,fmt,al); |
| 47 | va_end(al); |
| 48 | } |
| 49 | |
| 50 | |
| 51 | void adns__vbuf_init(vbuf *vb) { |
| 52 | vb->used= vb->avail= 0; vb->buf= 0; |
| 53 | } |
| 54 | |
| 55 | int adns__vbuf_ensure(vbuf *vb, int want) { |
| 56 | void *nb; |
| 57 | |
| 58 | if (vb->avail >= want) return 1; |
| 59 | nb= realloc(vb->buf,want); if (!nb) return 0; |
| 60 | vb->buf= nb; |
| 61 | vb->avail= want; |
| 62 | return 1; |
| 63 | } |
| 64 | |
| 65 | void adns__vbuf_appendq(vbuf *vb, const byte *data, int len) { |
| 66 | memcpy(vb->buf+vb->used,data,len); |
| 67 | vb->used+= len; |
| 68 | } |
| 69 | |
| 70 | int adns__vbuf_append(vbuf *vb, const byte *data, int len) { |
| 71 | int newlen; |
| 72 | void *nb; |
| 73 | |
| 74 | newlen= vb->used+len; |
| 75 | if (vb->avail < newlen) { |
| 76 | newlen <<= 1; |
| 77 | nb= realloc(vb->buf,newlen); |
| 78 | if (!nb) { newlen >>= 1; nb= realloc(vb->buf,newlen); } |
| 79 | if (!nb) return 0; |
| 80 | vb->buf= nb; |
| 81 | vb->avail= newlen; |
| 82 | } |
| 83 | adns__vbuf_appendq(vb,data,len); |
| 84 | return 1; |
| 85 | } |
| 86 | |
| 87 | |
| 88 | static void addserver(adns_state ads, struct in_addr addr) { |
| 89 | int i; |
| 90 | struct server *ss; |
| 91 | |
| 92 | for (i=0; i<ads->nservers; i++) { |
| 93 | if (ads->servers[i].addr.s_addr == addr.s_addr) { |
| 94 | adns__debug(ads,-1,"duplicate nameserver %s ignored",inet_ntoa(addr)); |
| 95 | return; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | if (ads->nservers>=MAXSERVERS) { |
| 100 | adns__diag(ads,-1,"too many nameservers, ignoring %s",inet_ntoa(addr)); |
| 101 | return; |
| 102 | } |
| 103 | |
| 104 | ss= ads->servers+ads->nservers; |
| 105 | ss->addr= addr; |
| 106 | ads->nservers++; |
| 107 | } |
| 108 | |
| 109 | static void configparseerr(adns_state ads, const char *fn, int lno, |
| 110 | const char *fmt, ...) { |
| 111 | va_list al; |
| 112 | |
| 113 | if (ads->iflags & adns_if_noerrprint) return; |
| 114 | if (lno==-1) fprintf(stderr,"adns: %s: ",fn); |
| 115 | else fprintf(stderr,"adns: %s:%d: ",fn,lno); |
| 116 | va_start(al,fmt); |
| 117 | vfprintf(stderr,fmt,al); |
| 118 | va_end(al); |
| 119 | fputc('\n',stderr); |
| 120 | } |
| 121 | |
| 122 | static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) { |
| 123 | struct in_addr ia; |
| 124 | |
| 125 | if (!inet_aton(buf,&ia)) { |
| 126 | configparseerr(ads,fn,lno,"invalid nameserver address `%s'",buf); |
| 127 | return; |
| 128 | } |
| 129 | adns__debug(ads,-1,"using nameserver %s",inet_ntoa(ia)); |
| 130 | addserver(ads,ia); |
| 131 | } |
| 132 | |
| 133 | static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) { |
| 134 | if (!buf) return; |
| 135 | adns__diag(ads,-1,"warning - `search' ignored FIXME"); |
| 136 | } |
| 137 | |
| 138 | static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) { |
| 139 | adns__diag(ads,-1,"warning - `sortlist' ignored FIXME"); |
| 140 | } |
| 141 | |
| 142 | static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) { |
| 143 | if (!buf) return; |
| 144 | adns__diag(ads,-1,"warning - `options' ignored FIXME"); |
| 145 | } |
| 146 | |
| 147 | static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) { |
| 148 | ads->nservers= 0; |
| 149 | } |
| 150 | |
| 151 | static const struct configcommandinfo { |
| 152 | const char *name; |
| 153 | void (*fn)(adns_state ads, const char *fn, int lno, const char *buf); |
| 154 | } configcommandinfos[]= { |
| 155 | { "nameserver", ccf_nameserver }, |
| 156 | { "domain", ccf_search }, |
| 157 | { "search", ccf_search }, |
| 158 | { "sortlist", ccf_sortlist }, |
| 159 | { "options", ccf_options }, |
| 160 | { "clearnameservers", ccf_clearnss }, |
| 161 | { 0 } |
| 162 | }; |
| 163 | |
| 164 | static void readconfig(adns_state ads, const char *filename) { |
| 165 | char linebuf[2000], *p, *q; |
| 166 | FILE *file; |
| 167 | int lno, l, c; |
| 168 | const struct configcommandinfo *ccip; |
| 169 | |
| 170 | file= fopen(filename,"r"); |
| 171 | if (!file) { |
| 172 | if (errno == ENOENT) { |
| 173 | adns__debug(ads,-1,"configuration file `%s' does not exist",filename); |
| 174 | return; |
| 175 | } |
| 176 | adns__diag(ads,-1,"cannot open configuration file `%s': %s", |
| 177 | filename,strerror(errno)); |
| 178 | return; |
| 179 | } |
| 180 | |
| 181 | for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) { |
| 182 | l= strlen(linebuf); |
| 183 | if (!l) continue; |
| 184 | if (linebuf[l-1] != '\n' && !feof(file)) { |
| 185 | adns__diag(ads,-1,"%s:%d: line too long",filename,lno); |
| 186 | while ((c= getc(file)) != EOF && c != '\n') { } |
| 187 | if (c == EOF) break; |
| 188 | continue; |
| 189 | } |
| 190 | while (l>0 && ctype_whitespace(linebuf[l-1])) l--; |
| 191 | linebuf[l]= 0; |
| 192 | p= linebuf; |
| 193 | while (ctype_whitespace(*p)) p++; |
| 194 | if (*p == '#' || *p == '\n') continue; |
| 195 | q= p; |
| 196 | while (*q && !ctype_whitespace(*q)) q++; |
| 197 | for (ccip=configcommandinfos; |
| 198 | ccip->name && strncmp(ccip->name,p,q-p); |
| 199 | ccip++); |
| 200 | if (!ccip->name) { |
| 201 | adns__diag(ads,-1,"%s:%d: unknown configuration directive `%.*s'", |
| 202 | filename,lno,q-p,p); |
| 203 | continue; |
| 204 | } |
| 205 | while (ctype_whitespace(*q)) q++; |
| 206 | ccip->fn(ads,filename,lno,q); |
| 207 | } |
| 208 | if (ferror(file)) { |
| 209 | adns__diag(ads,-1,"%s:%d: read error: %s",filename,lno,strerror(errno)); |
| 210 | } |
| 211 | fclose(file); |
| 212 | } |
| 213 | |
| 214 | static const char *instrum_getenv(adns_state ads, const char *envvar) { |
| 215 | const char *value; |
| 216 | |
| 217 | value= getenv(envvar); |
| 218 | if (!value) adns__debug(ads,-1,"environment variable %s not set",envvar); |
| 219 | else adns__debug(ads,-1,"environment variable %s set to `%s'",envvar,value); |
| 220 | return value; |
| 221 | } |
| 222 | |
| 223 | static void readconfigenv(adns_state ads, const char *envvar) { |
| 224 | const char *filename; |
| 225 | |
| 226 | if (ads->iflags & adns_if_noenv) { |
| 227 | adns__debug(ads,-1,"not checking environment variable `%s'",envvar); |
| 228 | return; |
| 229 | } |
| 230 | filename= instrum_getenv(ads,envvar); |
| 231 | if (filename) readconfig(ads,filename); |
| 232 | } |
| 233 | |
| 234 | |
| 235 | int adns__setnonblock(adns_state ads, int fd) { |
| 236 | int r; |
| 237 | |
| 238 | r= fcntl(fd,F_GETFL,0); if (r<0) return errno; |
| 239 | r |= O_NONBLOCK; |
| 240 | r= fcntl(fd,F_SETFL,r); if (r<0) return errno; |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) { |
| 245 | adns_state ads; |
| 246 | const char *res_options, *adns_res_options; |
| 247 | struct protoent *proto; |
| 248 | int r; |
| 249 | |
| 250 | ads= malloc(sizeof(*ads)); if (!ads) return errno; |
| 251 | ads->iflags= flags; |
| 252 | ads->diagfile= diagfile ? diagfile : stderr; |
| 253 | LIST_INIT(ads->timew); |
| 254 | LIST_INIT(ads->childw); |
| 255 | LIST_INIT(ads->output); |
| 256 | ads->nextid= 0x311f; |
| 257 | ads->udpsocket= ads->tcpsocket= -1; |
| 258 | adns__vbuf_init(&ads->rqbuf); |
| 259 | adns__vbuf_init(&ads->tcpsend); |
| 260 | adns__vbuf_init(&ads->tcprecv); |
| 261 | ads->nservers= ads->tcpserver= 0; |
| 262 | ads->tcpstate= server_disconnected; |
| 263 | timerclear(&ads->tcptimeout); |
| 264 | |
| 265 | res_options= instrum_getenv(ads,"RES_OPTIONS"); |
| 266 | adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS"); |
| 267 | ccf_options(ads,"RES_OPTIONS",-1,res_options); |
| 268 | ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options); |
| 269 | |
| 270 | readconfig(ads,"/etc/resolv.conf"); |
| 271 | readconfigenv(ads,"RES_CONF"); |
| 272 | readconfigenv(ads,"ADNS_RES_CONF"); |
| 273 | |
| 274 | ccf_options(ads,"RES_OPTIONS",-1,res_options); |
| 275 | ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options); |
| 276 | |
| 277 | ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN")); |
| 278 | ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN")); |
| 279 | |
| 280 | if (!ads->nservers) { |
| 281 | struct in_addr ia; |
| 282 | if (ads->iflags & adns_if_debug) |
| 283 | fprintf(stderr,"adns: no nameservers, using localhost\n"); |
| 284 | ia.s_addr= INADDR_LOOPBACK; |
| 285 | addserver(ads,ia); |
| 286 | } |
| 287 | |
| 288 | proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; } |
| 289 | ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto); |
| 290 | if (ads->udpsocket<0) { r= errno; goto x_free; } |
| 291 | |
| 292 | /*fixme: nonblock */ |
| 293 | |
| 294 | *ads_r= ads; |
| 295 | return 0; |
| 296 | |
| 297 | x_free: |
| 298 | free(ads); |
| 299 | return r; |
| 300 | } |
| 301 | |
| 302 | int adns_finish(adns_state ads) { |
| 303 | abort(); /* FIXME */ |
| 304 | } |