From de47eb59bb829423b1d0f47ba13099073999b3cb Mon Sep 17 00:00:00 2001 From: Nicolas Planel Date: Wed, 29 Oct 2003 16:07:11 +0000 Subject: Corporate Server 2.1.1 release --- mdk-stage1/dietlibc/libcruft/dnscruft2.c | 264 +++++++++++++++---------------- 1 file changed, 126 insertions(+), 138 deletions(-) (limited to 'mdk-stage1/dietlibc/libcruft/dnscruft2.c') diff --git a/mdk-stage1/dietlibc/libcruft/dnscruft2.c b/mdk-stage1/dietlibc/libcruft/dnscruft2.c index b59207072..d4e132e42 100644 --- a/mdk-stage1/dietlibc/libcruft/dnscruft2.c +++ b/mdk-stage1/dietlibc/libcruft/dnscruft2.c @@ -8,178 +8,166 @@ #include #include #include +#include +#include +#include "dietfeatures.h" +#include "dietdns.h" -#include +extern void __dns_readstartfiles(void); -extern int h_errno; - -static char dnspacket[]="\xfe\xfe\001\000\000\001\000\000\000\000\000\000"; - -extern void __dns_make_fd(); -extern int __dns_fd; - -extern int __dns_servers; -extern struct sockaddr __dns_server_ips[]; - -extern void __dns_readstartfiles(); - -extern int __dns_decodename(unsigned char *packet,int offset,unsigned char *dest,int maxlen); +extern int __dns_decodename(unsigned char *packet,unsigned int offset,unsigned char *dest, + unsigned int maxlen,unsigned char* behindpacket); /* Oh boy, this interface sucks so badly, there are no words for it. * Not one, not two, but _three_ error signalling methods! (*h_errnop * nonzero? return value nonzero? *RESULT zero?) The glibc goons * really outdid themselves with this one. */ +#ifdef WANT_FULL_RESOLV_CONF +static int __dns_gethostbyx_r_inner(const char* name, struct hostent* result, + char *buf, size_t buflen, + struct hostent **RESULT, int *h_errnop, int lookfor); + +static int __dns_gethostbyx_r_inner(const char* name, struct hostent* result, + char *buf, size_t buflen, + struct hostent **RESULT, int *h_errnop, int lookfor) { +#else int __dns_gethostbyx_r(const char* name, struct hostent* result, char *buf, size_t buflen, struct hostent **RESULT, int *h_errnop, int lookfor) { +#endif int names,ips; unsigned char *cur; unsigned char *max; - unsigned char packet[512]; - __dns_make_fd(); + unsigned char inpkg[1500]; + char* tmp; + int size; if (lookfor==1) { - result->h_aliases=(char**)(buf+8*4); result->h_addrtype=AF_INET; result->h_length=4; - result->h_addr_list=(char**)buf; } else { - result->h_aliases=(char**)(buf+8*16); result->h_addrtype=AF_INET6; result->h_length=16; - result->h_addr_list=(char**)buf; } + result->h_aliases=(char**)(buf+8*sizeof(char*)); + result->h_addr_list=(char**)buf; result->h_aliases[0]=0; cur=buf+16*sizeof(char*); max=buf+buflen; names=ips=0; - memmove(packet,dnspacket,12); - *(unsigned short*)packet=rand(); + if ((size=res_query(name,C_IN,lookfor,inpkg,512))<0) { +invalidpacket: + *h_errnop=HOST_NOT_FOUND; + return -1; + } { - unsigned char* x; - const char* y,* tmp; - x=packet+12; y=name; - while (*y) { - while (*y=='.') ++y; - for (tmp=y; *tmp && *tmp!='.'; ++tmp) ; - *x=tmp-y; - if (!(tmp-y)) break; - ++x; - if (x>=packet+510-(tmp-y)) { *h_errnop=ERANGE; return 1; } - memmove(x,y,tmp-y); - x+=tmp-y; - if (!*tmp) { - *x=0; - break; - } - y=tmp; - } - *++x= 0; *++x= lookfor; /* A */ - *++x= 0; *++x= 1; /* IN */ - ++x; + tmp=inpkg+12; { - int i; /* current server */ - int j; /* timeout count down */ - struct pollfd duh; - i=0; j=30; - __dns_readstartfiles(); - duh.fd=__dns_fd; - duh.events=POLLIN; - for (j=30; j>0; --j) { - sendto(__dns_fd,packet,x-packet,0,(struct sockaddr*)&(__dns_server_ips[i]),sizeof(struct sockaddr)); - if (++i > __dns_servers) i=0; - if (poll(&duh,1,1) == 1) { - /* read and parse answer */ - unsigned char inpkg[1500]; - /*int len=*/ read(__dns_fd,inpkg,1500); -#if 0 - { - int tft=open("duh",0); - read(tft,inpkg,1500); - close(tft); - } -#endif - /* header, question, answer, authority, additional */ - if (inpkg[0]!=packet[0] || inpkg[1]!=packet[1]) continue; /* wrong ID */ - if ((inpkg[2]&0xf9) != 0x81) continue; /* not answer */ - if ((inpkg[3]&0x0f) != 0) break; /* error */ - tmp=inpkg+12; - { - char name[257]; - unsigned short q=((unsigned short)inpkg[4]<<8)+inpkg[5]; - while (q>0) { - while (*tmp) tmp+=*tmp+1; - tmp+=5; - --q; - } - q=((unsigned short)inpkg[6]<<8)+inpkg[7]; - if (q<1) break; - while (q>0) { - int decofs=__dns_decodename(inpkg,tmp-(char*)inpkg,name,256); - if (decofs<0) break; - tmp=inpkg+decofs; - --q; - if (tmp[0]!=0 || tmp[1]!=lookfor || /* TYPE != A */ - tmp[2]!=0 || tmp[3]!=1) { /* CLASS != IN */ - if (tmp[1]==5) { /* CNAME */ - tmp+=10; - decofs=__dns_decodename(inpkg,tmp-(char*)inpkg,name,256); - if (decofs<0) break; - tmp=inpkg+decofs; - } else - break; - continue; - } - tmp+=10; /* skip type, class, TTL and length */ - { - int slen; - if (lookfor==1 || lookfor==28) /* A or AAAA*/ { - slen=strlen(name); - if (cur+slen+8+(lookfor==28?12:0)>=max) { *h_errnop=NO_RECOVERY; return 1; } - } else if (lookfor==12) /* PTR */ { - decofs=__dns_decodename(inpkg,tmp-(char*)inpkg,name,256); - if (decofs<0) break; - tmp=inpkg+decofs; - slen=strlen(name); - } else - slen=strlen(name); - strcpy(cur,name); - if (names==0) - result->h_name=cur; - else - result->h_aliases[names-1]=cur; - result->h_aliases[names]=0; - ++names; + char Name[257]; + unsigned short q=((unsigned short)inpkg[4]<<8)+inpkg[5]; + while (q>0) { + if (tmp>(char*)inpkg+size) goto invalidpacket; + while (*tmp) { tmp+=*tmp+1; if (tmp>(char*)inpkg+size) goto invalidpacket; } + tmp+=5; + --q; + } + if (tmp>(char*)inpkg+size) goto invalidpacket; + q=((unsigned short)inpkg[6]<<8)+inpkg[7]; + if (q<1) goto nodata; + while (q>0) { + int decofs=__dns_decodename(inpkg,(size_t)(tmp-(char*)inpkg),Name,256,inpkg+size); + if (decofs<0) break; + tmp=inpkg+decofs; + --q; + if (tmp[0]!=0 || tmp[1]!=lookfor || /* TYPE != A */ + tmp[2]!=0 || tmp[3]!=1) { /* CLASS != IN */ + if (tmp[1]==5) { /* CNAME */ + tmp+=10; + decofs=__dns_decodename(inpkg,(size_t)(tmp-(char*)inpkg),Name,256,inpkg+size); + if (decofs<0) break; + tmp=inpkg+decofs; + } else + break; + continue; + } + tmp+=10; /* skip type, class, TTL and length */ + { + int slen; + if (lookfor==1 || lookfor==28) /* A or AAAA*/ { + slen=strlen(Name); + if (cur+slen+8+(lookfor==28?12:0)>=max) { *h_errnop=NO_RECOVERY; return -1; } + } else if (lookfor==12) /* PTR */ { + decofs=__dns_decodename(inpkg,(size_t)(tmp-(char*)inpkg),Name,256,inpkg+size); + if (decofs<0) break; + tmp=inpkg+decofs; + slen=strlen(Name); + } else + slen=strlen(Name); + strcpy(cur,Name); + if (names==0) + result->h_name=cur; + else + result->h_aliases[names-1]=cur; + result->h_aliases[names]=0; + if (names<8) ++names; /* cur+=slen+1; */ - cur+=(slen|3)+1; - result->h_addr_list[ips++] = cur; - if (lookfor==1) /* A */ { - *(int*)cur=*(int*)tmp; - cur+=4; - result->h_addr_list[ips]=0; - } else if (lookfor==28) /* AAAA */ { - { - int i; - for (i=0; i<16; ++i) cur[i]=tmp[i]; - } - cur+=16; - result->h_addr_list[ips]=0; - } - } -/* puts(name); */ + cur+=(slen|3)+1; + result->h_addr_list[ips++] = cur; + if (lookfor==1) /* A */ { + *(int*)cur=*(int*)tmp; + cur+=4; + result->h_addr_list[ips]=0; + } else if (lookfor==28) /* AAAA */ { + { + int k; + for (k=0; k<16; ++k) cur[k]=tmp[k]; } + cur+=16; + result->h_addr_list[ips]=0; } -/* printf("%d answers\n",((unsigned short)inpkg[6]<<8)+inpkg[7]); - printf("ok\n");*/ - *h_errnop=0; - *RESULT=result; - return 0; } -/*kaputt:*/ +/* puts(Name); */ } } } - return 1; + if (!names) { +nodata: + *h_errnop=NO_DATA; + return -1; + } + *h_errnop=0; + *RESULT=result; + return 0; +} + +#ifdef WANT_FULL_RESOLV_CONF +extern int __dns_search; +extern char *__dns_domains[]; + +int __dns_gethostbyx_r(const char* name, struct hostent* result, + char *buf, size_t buflen, + struct hostent **RESULT, int *h_errnop, int lookfor) { + const char *tmp=name; + char Buf[MAXDNAME+1]; + int res; + size_t len=strlen(name); + int count=0; + __dns_readstartfiles(); + memmove(Buf,name,len); + Buf[len]=Buf[MAXDNAME]=0; +// printf("appending %d: %p\n",count,__dns_domains[count]); + while ((res=__dns_gethostbyx_r_inner(tmp,result,buf,buflen,RESULT,h_errnop,lookfor))) { + if (res==-1 && *h_errnop!=HOST_NOT_FOUND) break; + if (count==__dns_search) break; + Buf[len]='.'; +// printf("appending %d: %p (%s)\n",count,__dns_domains[count],__dns_domains[count]); + memccpy(Buf+len+1,__dns_domains[count],0,MAXDNAME-len-1); + tmp=Buf; + ++count; + } + return res; } +#endif + -- cgit v1.2.1