* - management of global state
*/
/*
- * This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson
+ * This file is
+ * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
+ *
+ * It is part of adns, which is
+ * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
+ * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <stdlib.h>
#include <errno.h>
-#include <string.h>
+#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <netdb.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
#include <arpa/inet.h>
#include "internal.h"
+static void readconfig(adns_state ads, const char *filename, int warnmissing);
+
static void addserver(adns_state ads, struct in_addr addr) {
int i;
struct server *ss;
ads->nservers++;
}
+static void freesearchlist(adns_state ads) {
+ if (ads->nsearchlist) free(*ads->searchlist);
+ free(ads->searchlist);
+}
+
+static void saveerr(adns_state ads, int en) {
+ if (!ads->configerrno) ads->configerrno= en;
+}
+
static void configparseerr(adns_state ads, const char *fn, int lno,
const char *fmt, ...) {
va_list al;
-
- if (ads->iflags & adns_if_noerrprint) return;
- if (lno==-1) fprintf(stderr,"adns: %s: ",fn);
- else fprintf(stderr,"adns: %s:%d: ",fn,lno);
+
+ saveerr(ads,EINVAL);
+ if (!ads->diagfile || (ads->iflags & adns_if_noerrprint)) return;
+
+ if (lno==-1) fprintf(ads->diagfile,"adns: %s: ",fn);
+ else fprintf(ads->diagfile,"adns: %s:%d: ",fn,lno);
va_start(al,fmt);
- vfprintf(stderr,fmt,al);
+ vfprintf(ads->diagfile,fmt,al);
va_end(al);
- fputc('\n',stderr);
+ fputc('\n',ads->diagfile);
+}
+
+static int nextword(const char **bufp_io, const char **word_r, int *l_r) {
+ const char *p, *q;
+
+ p= *bufp_io;
+ while (ctype_whitespace(*p)) p++;
+ if (!*p) return 0;
+
+ q= p;
+ while (*q && !ctype_whitespace(*q)) q++;
+
+ *l_r= q-p;
+ *word_r= p;
+ *bufp_io= q;
+
+ return 1;
}
static void ccf_nameserver(adns_state ads, const char *fn, int lno, const char *buf) {
}
static void ccf_search(adns_state ads, const char *fn, int lno, const char *buf) {
+ const char *bufp, *word;
+ char *newchars, **newptrs, **pp;
+ int count, tl, l;
+
if (!buf) return;
- adns__diag(ads,-1,0,"warning - `search' ignored fixme");
+
+ bufp= buf;
+ count= 0;
+ tl= 0;
+ while (nextword(&bufp,&word,&l)) { count++; tl += l+1; }
+
+ newptrs= malloc(sizeof(char*)*count); if (!newptrs) { saveerr(ads,errno); return; }
+ newchars= malloc(tl); if (!newchars) { saveerr(ads,errno); free(newptrs); return; }
+
+ bufp= buf;
+ pp= newptrs;
+ while (nextword(&bufp,&word,&l)) {
+ *pp++= newchars;
+ memcpy(newchars,word,l);
+ newchars += l;
+ *newchars++ = 0;
+ }
+
+ freesearchlist(ads);
+ ads->nsearchlist= count;
+ ads->searchlist= newptrs;
}
static void ccf_sortlist(adns_state ads, const char *fn, int lno, const char *buf) {
- adns__diag(ads,-1,0,"warning - `sortlist' ignored fixme");
+ const char *word;
+ char tbuf[200], *slash, *ep;
+ struct in_addr base, mask;
+ int l;
+ unsigned long initial, baselocal;
+
+ if (!buf) return;
+
+ ads->nsortlist= 0;
+ while (nextword(&buf,&word,&l)) {
+ if (ads->nsortlist >= MAXSORTLIST) {
+ adns__diag(ads,-1,0,"too many sortlist entries, ignoring %.*s onwards",l,word);
+ return;
+ }
+
+ if (l >= sizeof(tbuf)) {
+ configparseerr(ads,fn,lno,"sortlist entry `%.*s' too long",l,word);
+ continue;
+ }
+
+ memcpy(tbuf,word,l); tbuf[l]= 0;
+ slash= strchr(tbuf,'/');
+ if (slash) *slash++= 0;
+
+ if (!inet_aton(tbuf,&base)) {
+ configparseerr(ads,fn,lno,"invalid address `%s' in sortlist",tbuf);
+ continue;
+ }
+
+ if (slash) {
+ if (strchr(slash,'.')) {
+ if (!inet_aton(slash,&mask)) {
+ configparseerr(ads,fn,lno,"invalid mask `%s' in sortlist",slash);
+ continue;
+ }
+ if (base.s_addr & ~mask.s_addr) {
+ configparseerr(ads,fn,lno,
+ "mask `%s' in sortlist overlaps address `%s'",slash,tbuf);
+ continue;
+ }
+ } else {
+ initial= strtoul(slash,&ep,10);
+ if (*ep || initial>32) {
+ configparseerr(ads,fn,lno,"mask length `%s' invalid",slash);
+ continue;
+ }
+ mask.s_addr= htonl((0x0ffffffffUL) << (32-initial));
+ }
+ } else {
+ baselocal= ntohl(base.s_addr);
+ if (!baselocal & 0x080000000UL) /* class A */
+ mask.s_addr= htonl(0x0ff000000UL);
+ else if ((baselocal & 0x0c0000000UL) == 0x080000000UL)
+ mask.s_addr= htonl(0x0ffff0000UL); /* class B */
+ else if ((baselocal & 0x0f0000000UL) == 0x0e0000000UL)
+ mask.s_addr= htonl(0x0ff000000UL); /* class C */
+ else {
+ configparseerr(ads,fn,lno,
+ "network address `%s' in sortlist is not in classed ranges,"
+ " must specify mask explicitly", tbuf);
+ continue;
+ }
+ }
+
+ ads->sortlist[ads->nsortlist].base= base;
+ ads->sortlist[ads->nsortlist].mask= mask;
+ ads->nsortlist++;
+ }
}
static void ccf_options(adns_state ads, const char *fn, int lno, const char *buf) {
+ const char *word;
+ char *ep;
+ unsigned long v;
+ int l;
+
if (!buf) return;
- adns__diag(ads,-1,0,"warning - `options' ignored fixme");
+
+ while (nextword(&buf,&word,&l)) {
+ if (l==5 && !memcmp(word,"debug",5)) {
+ ads->iflags |= adns_if_debug;
+ continue;
+ }
+ if (l>=6 && !memcmp(word,"ndots:",6)) {
+ v= strtoul(word+6,&ep,10);
+ if (l==6 || ep != word+l || v > INT_MAX) {
+ configparseerr(ads,fn,lno,"option `%.*s' malformed or has bad value",l,word);
+ continue;
+ }
+ ads->searchndots= v;
+ continue;
+ }
+ if (l>=12 && !memcmp(word,"adns_checkc:",12)) {
+ if (!strcmp(word+12,"none")) {
+ ads->iflags &= ~adns_if_checkc_freq;
+ ads->iflags |= adns_if_checkc_entex;
+ } else if (!strcmp(word+12,"entex")) {
+ ads->iflags &= ~adns_if_checkc_freq;
+ ads->iflags |= adns_if_checkc_entex;
+ } else if (!strcmp(word+12,"freq")) {
+ ads->iflags |= adns_if_checkc_freq;
+ } else {
+ configparseerr(ads,fn,lno, "option adns_checkc has bad value `%s' "
+ "(must be none, entex or freq", word+12);
+ }
+ continue;
+ }
+ adns__diag(ads,-1,0,"%s:%d: unknown option `%.*s'", fn,lno, l,word);
+ }
}
static void ccf_clearnss(adns_state ads, const char *fn, int lno, const char *buf) {
ads->nservers= 0;
}
+static void ccf_include(adns_state ads, const char *fn, int lno, const char *buf) {
+ if (!*buf) {
+ configparseerr(ads,fn,lno,"`include' directive with no filename");
+ return;
+ }
+ readconfig(ads,buf,1);
+}
+
+static void ccf_lookup(adns_state ads, const char *fn, int lno,
+ const char *buf) {
+ int found_bind=0;
+ const char *word;
+ int l;
+
+ if (!*buf) {
+ configparseerr(ads,fn,lno,"`lookup' directive with no databases");
+ return;
+ }
+
+ while (nextword(&buf,&word,&l)) {
+ if (l==4 && !memcmp(word,"bind",4)) {
+ found_bind=1;
+ } else if (l==4 && !memcmp(word,"file",4)) {
+ /* ignore this and hope /etc/hosts is not essential */
+ } else if (l==2 && !memcmp(word,"yp",2)) {
+ adns__diag(ads,-1,0,"%s:%d: yp lookups not supported by adns", fn,lno);
+ found_bind=-1;
+ } else {
+ adns__diag(ads,-1,0,"%s:%d: unknown `lookup' database `%.*s'",
+ fn,lno, l,word);
+ found_bind=-1;
+ }
+ }
+ if (!found_bind)
+ adns__diag(ads,-1,0,"%s:%d: `lookup' specified, but not `bind'", fn,lno);
+}
+
static const struct configcommandinfo {
const char *name;
void (*fn)(adns_state ads, const char *fn, int lno, const char *buf);
{ "sortlist", ccf_sortlist },
{ "options", ccf_options },
{ "clearnameservers", ccf_clearnss },
+ { "include", ccf_include },
+ { "lookup", ccf_lookup }, /* OpenBSD */
{ 0 }
};
-static void readconfig(adns_state ads, const char *filename) {
- char linebuf[2000], *p, *q;
+typedef union {
FILE *file;
- int lno, l, c;
- const struct configcommandinfo *ccip;
+ const char *text;
+} getline_ctx;
- file= fopen(filename,"r");
- if (!file) {
- if (errno == ENOENT) {
- adns__debug(ads,-1,0,"configuration file `%s' does not exist",filename);
- return;
+static int gl_file(adns_state ads, getline_ctx *src_io, const char *filename,
+ int lno, char *buf, int buflen) {
+ FILE *file= src_io->file;
+ int c, i;
+ char *p;
+
+ p= buf;
+ buflen--;
+ i= 0;
+
+ for (;;) { /* loop over chars */
+ if (i == buflen) {
+ adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
+ goto x_badline;
+ }
+ c= getc(file);
+ if (!c) {
+ adns__diag(ads,-1,0,"%s:%d: line contains nul, ignored",filename,lno);
+ goto x_badline;
+ } else if (c == '\n') {
+ break;
+ } else if (c == EOF) {
+ if (ferror(file)) {
+ saveerr(ads,errno);
+ adns__diag(ads,-1,0,"%s:%d: read error: %s",filename,lno,strerror(errno));
+ return -1;
+ }
+ if (!i) return -1;
+ break;
+ } else {
+ *p++= c;
+ i++;
}
- adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
- filename,strerror(errno));
- return;
}
- for (lno=1; fgets(linebuf,sizeof(linebuf),file); lno++) {
- l= strlen(linebuf);
- if (!l) continue;
- if (linebuf[l-1] != '\n' && !feof(file)) {
- adns__diag(ads,-1,0,"%s:%d: line too long",filename,lno);
- while ((c= getc(file)) != EOF && c != '\n') { }
- if (c == EOF) break;
- continue;
- }
+ *p++= 0;
+ return i;
+
+ x_badline:
+ saveerr(ads,EINVAL);
+ while ((c= getc(file)) != EOF && c != '\n');
+ return -2;
+}
+
+static int gl_text(adns_state ads, getline_ctx *src_io, const char *filename,
+ int lno, char *buf, int buflen) {
+ const char *cp= src_io->text;
+ int l;
+
+ if (!cp || !*cp) return -1;
+
+ if (*cp == ';' || *cp == '\n') cp++;
+ l= strcspn(cp,";\n");
+ src_io->text = cp+l;
+
+ if (l >= buflen) {
+ adns__diag(ads,-1,0,"%s:%d: line too long, ignored",filename,lno);
+ saveerr(ads,EINVAL);
+ return -2;
+ }
+
+ memcpy(buf,cp,l);
+ buf[l]= 0;
+ return l;
+}
+
+static void readconfiggeneric(adns_state ads, const char *filename,
+ int (*getline)(adns_state ads, getline_ctx*,
+ const char *filename, int lno,
+ char *buf, int buflen),
+ /* Returns >=0 for success, -1 for EOF or error
+ * (error will have been reported), or -2 for
+ * bad line was encountered, try again.
+ */
+ getline_ctx gl_ctx) {
+ char linebuf[2000], *p, *q;
+ int lno, l, dirl;
+ const struct configcommandinfo *ccip;
+
+ for (lno=1;
+ (l= getline(ads,&gl_ctx, filename,lno, linebuf,sizeof(linebuf))) != -1;
+ lno++) {
+ if (l == -2) continue;
while (l>0 && ctype_whitespace(linebuf[l-1])) l--;
linebuf[l]= 0;
p= linebuf;
while (ctype_whitespace(*p)) p++;
- if (*p == '#' || *p == '\n') continue;
+ if (*p == '#' || !*p) continue;
q= p;
while (*q && !ctype_whitespace(*q)) q++;
+ dirl= q-p;
for (ccip=configcommandinfos;
- ccip->name && strncmp(ccip->name,p,q-p);
+ ccip->name && !(strlen(ccip->name)==dirl && !memcmp(ccip->name,p,q-p));
ccip++);
if (!ccip->name) {
adns__diag(ads,-1,0,"%s:%d: unknown configuration directive `%.*s'",
while (ctype_whitespace(*q)) q++;
ccip->fn(ads,filename,lno,q);
}
- if (ferror(file)) {
- adns__diag(ads,-1,0,"%s:%d: read error: %s",filename,lno,strerror(errno));
- }
- fclose(file);
}
static const char *instrum_getenv(adns_state ads, const char *envvar) {
return value;
}
+static void readconfig(adns_state ads, const char *filename, int warnmissing) {
+ getline_ctx gl_ctx;
+
+ gl_ctx.file= fopen(filename,"r");
+ if (!gl_ctx.file) {
+ if (errno == ENOENT) {
+ if (warnmissing)
+ adns__debug(ads,-1,0,"configuration file `%s' does not exist",filename);
+ return;
+ }
+ saveerr(ads,errno);
+ adns__diag(ads,-1,0,"cannot open configuration file `%s': %s",
+ filename,strerror(errno));
+ return;
+ }
+
+ readconfiggeneric(ads,filename,gl_file,gl_ctx);
+
+ fclose(gl_ctx.file);
+}
+
+static void readconfigtext(adns_state ads, const char *text, const char *showname) {
+ getline_ctx gl_ctx;
+
+ gl_ctx.text= text;
+ readconfiggeneric(ads,showname,gl_text,gl_ctx);
+}
+
static void readconfigenv(adns_state ads, const char *envvar) {
const char *filename;
return;
}
filename= instrum_getenv(ads,envvar);
- if (filename) readconfig(ads,filename);
+ if (filename) readconfig(ads,filename,1);
+}
+
+static void readconfigenvtext(adns_state ads, const char *envvar) {
+ const char *textdata;
+
+ if (ads->iflags & adns_if_noenv) {
+ adns__debug(ads,-1,0,"not checking environment variable `%s'",envvar);
+ return;
+ }
+ textdata= instrum_getenv(ads,envvar);
+ if (textdata) readconfigtext(ads,textdata,envvar);
}
return 0;
}
-int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
+static int init_begin(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
adns_state ads;
- const char *res_options, *adns_res_options;
- struct protoent *proto;
- int r;
ads= malloc(sizeof(*ads)); if (!ads) return errno;
+
ads->iflags= flags;
- ads->diagfile= diagfile ? diagfile : stderr;
- LIST_INIT(ads->timew);
+ ads->diagfile= diagfile;
+ ads->configerrno= 0;
+ LIST_INIT(ads->udpw);
+ LIST_INIT(ads->tcpw);
LIST_INIT(ads->childw);
LIST_INIT(ads->output);
+ ads->forallnext= 0;
ads->nextid= 0x311f;
ads->udpsocket= ads->tcpsocket= -1;
adns__vbuf_init(&ads->tcpsend);
adns__vbuf_init(&ads->tcprecv);
- ads->nservers= ads->tcpserver= 0;
+ ads->tcprecv_skip= 0;
+ ads->nservers= ads->nsortlist= ads->nsearchlist= ads->tcpserver= 0;
+ ads->searchndots= 1;
ads->tcpstate= server_disconnected;
timerclear(&ads->tcptimeout);
+ ads->searchlist= 0;
+
+ *ads_r= ads;
+ return 0;
+}
+
+static int init_finish(adns_state ads) {
+ struct in_addr ia;
+ struct protoent *proto;
+ int r;
+
+ if (!ads->nservers) {
+ if (ads->diagfile && ads->iflags & adns_if_debug)
+ fprintf(ads->diagfile,"adns: no nameservers, using localhost\n");
+ ia.s_addr= htonl(INADDR_LOOPBACK);
+ addserver(ads,ia);
+ }
+
+ proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
+ ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
+ if (ads->udpsocket<0) { r= errno; goto x_free; }
+
+ r= adns__setnonblock(ads,ads->udpsocket);
+ if (r) { r= errno; goto x_closeudp; }
+
+ return 0;
+
+ x_closeudp:
+ close(ads->udpsocket);
+ x_free:
+ free(ads);
+ return r;
+}
+
+static void init_abort(adns_state ads) {
+ if (ads->nsearchlist) {
+ free(ads->searchlist[0]);
+ free(ads->searchlist);
+ }
+ free(ads);
+}
+int adns_init(adns_state *ads_r, adns_initflags flags, FILE *diagfile) {
+ adns_state ads;
+ const char *res_options, *adns_res_options;
+ int r;
+
+ r= init_begin(&ads, flags, diagfile ? diagfile : stderr);
+ if (r) return r;
+
res_options= instrum_getenv(ads,"RES_OPTIONS");
adns_res_options= instrum_getenv(ads,"ADNS_RES_OPTIONS");
ccf_options(ads,"RES_OPTIONS",-1,res_options);
ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
- readconfig(ads,"/etc/resolv.conf");
+ readconfig(ads,"/etc/resolv.conf",1);
+ readconfig(ads,"/etc/resolv-adns.conf",0);
readconfigenv(ads,"RES_CONF");
readconfigenv(ads,"ADNS_RES_CONF");
+ readconfigenvtext(ads,"RES_CONF_TEXT");
+ readconfigenvtext(ads,"ADNS_RES_CONF_TEXT");
+
ccf_options(ads,"RES_OPTIONS",-1,res_options);
ccf_options(ads,"ADNS_RES_OPTIONS",-1,adns_res_options);
ccf_search(ads,"LOCALDOMAIN",-1,instrum_getenv(ads,"LOCALDOMAIN"));
ccf_search(ads,"ADNS_LOCALDOMAIN",-1,instrum_getenv(ads,"ADNS_LOCALDOMAIN"));
- if (!ads->nservers) {
- struct in_addr ia;
- if (ads->iflags & adns_if_debug)
- fprintf(stderr,"adns: no nameservers, using localhost\n");
- ia.s_addr= INADDR_LOOPBACK;
- addserver(ads,ia);
+ if (ads->configerrno && ads->configerrno != EINVAL) {
+ r= ads->configerrno;
+ init_abort(ads);
+ return r;
}
- proto= getprotobyname("udp"); if (!proto) { r= ENOPROTOOPT; goto x_free; }
- ads->udpsocket= socket(AF_INET,SOCK_DGRAM,proto->p_proto);
- if (ads->udpsocket<0) { r= errno; goto x_free; }
+ r= init_finish(ads);
+ if (r) return r;
- r= adns__setnonblock(ads,ads->udpsocket);
- if (r) { r= errno; goto x_closeudp; }
-
+ adns__consistency(ads,0,cc_entex);
*ads_r= ads;
return 0;
+}
- x_closeudp:
- close(ads->udpsocket);
- x_free:
- free(ads);
- return r;
+int adns_init_strcfg(adns_state *ads_r, adns_initflags flags,
+ FILE *diagfile, const char *configtext) {
+ adns_state ads;
+ int r;
+
+ r= init_begin(&ads, flags, diagfile); if (r) return r;
+
+ readconfigtext(ads,configtext,"<supplied configuration text>");
+ if (ads->configerrno) {
+ r= ads->configerrno;
+ init_abort(ads);
+ return r;
+ }
+
+ r= init_finish(ads); if (r) return r;
+ adns__consistency(ads,0,cc_entex);
+ *ads_r= ads;
+ return 0;
}
+
void adns_finish(adns_state ads) {
+ adns__consistency(ads,0,cc_entex);
for (;;) {
- if (ads->timew.head) adns_cancel(ads->timew.head);
+ if (ads->udpw.head) adns_cancel(ads->udpw.head);
+ else if (ads->tcpw.head) adns_cancel(ads->tcpw.head);
else if (ads->childw.head) adns_cancel(ads->childw.head);
else if (ads->output.head) adns_cancel(ads->output.head);
else break;
if (ads->tcpsocket >= 0) close(ads->tcpsocket);
adns__vbuf_free(&ads->tcpsend);
adns__vbuf_free(&ads->tcprecv);
+ freesearchlist(ads);
free(ads);
}
+
+void adns_forallqueries_begin(adns_state ads) {
+ adns__consistency(ads,0,cc_entex);
+ ads->forallnext=
+ ads->udpw.head ? ads->udpw.head :
+ ads->tcpw.head ? ads->tcpw.head :
+ ads->childw.head ? ads->childw.head :
+ ads->output.head;
+}
+
+adns_query adns_forallqueries_next(adns_state ads, void **context_r) {
+ adns_query qu, nqu;
+
+ adns__consistency(ads,0,cc_entex);
+ nqu= ads->forallnext;
+ for (;;) {
+ qu= nqu;
+ if (!qu) return 0;
+ if (qu->next) {
+ nqu= qu->next;
+ } else if (qu == ads->udpw.tail) {
+ nqu=
+ ads->tcpw.head ? ads->tcpw.head :
+ ads->childw.head ? ads->childw.head :
+ ads->output.head;
+ } else if (qu == ads->tcpw.tail) {
+ nqu=
+ ads->childw.head ? ads->childw.head :
+ ads->output.head;
+ } else if (qu == ads->childw.tail) {
+ nqu= ads->output.head;
+ } else {
+ nqu= 0;
+ }
+ if (!qu->parent) break;
+ }
+ ads->forallnext= nqu;
+ if (context_r) *context_r= qu->ctx.ext;
+ return qu;
+}
~ianmdlvl / adns.git / blobdiff