diff options
Diffstat (limited to 'mdk-stage1/dietlibc/libcruft/dnscruft2.c')
| -rw-r--r-- | mdk-stage1/dietlibc/libcruft/dnscruft2.c | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/mdk-stage1/dietlibc/libcruft/dnscruft2.c b/mdk-stage1/dietlibc/libcruft/dnscruft2.c deleted file mode 100644 index b59207072..000000000 --- a/mdk-stage1/dietlibc/libcruft/dnscruft2.c +++ /dev/null @@ -1,185 +0,0 @@ -#include <string.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <netinet/in.h> -#include <netdb.h> -#include <stdlib.h> -#include <arpa/inet.h> -#include <sys/poll.h> -#include <unistd.h> -#include <errno.h> - -#include <stdio.h> - -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); - -/* 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. */ -int __dns_gethostbyx_r(const char* name, struct hostent* result, - char *buf, size_t buflen, - struct hostent **RESULT, int *h_errnop, int lookfor) { - int names,ips; - unsigned char *cur; - unsigned char *max; - unsigned char packet[512]; - __dns_make_fd(); - - 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[0]=0; - - cur=buf+16*sizeof(char*); - max=buf+buflen; - names=ips=0; - - memmove(packet,dnspacket,12); - *(unsigned short*)packet=rand(); - { - 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; - { - 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; -/* 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); */ - } - } -/* printf("%d answers\n",((unsigned short)inpkg[6]<<8)+inpkg[7]); - printf("ok\n");*/ - *h_errnop=0; - *RESULT=result; - return 0; - } -/*kaputt:*/ - } - } - } - return 1; -} |