diff options
Diffstat (limited to 'mdk-stage1/dietlibc/libcruft/dnscruft.c')
| -rw-r--r-- | mdk-stage1/dietlibc/libcruft/dnscruft.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/mdk-stage1/dietlibc/libcruft/dnscruft.c b/mdk-stage1/dietlibc/libcruft/dnscruft.c deleted file mode 100644 index bd8bee79a..000000000 --- a/mdk-stage1/dietlibc/libcruft/dnscruft.c +++ /dev/null @@ -1,181 +0,0 @@ -#include <sys/socket.h> -#include <netinet/in.h> -#include <sys/socket.h> -#include <unistd.h> -#include <fcntl.h> -#include <arpa/inet.h> -#include <string.h> -#include <ctype.h> -#include <stdlib.h> -#include <resolv.h> -#include <net/if.h> -#include "dietfeatures.h" - -int __dns_fd=-1; -#ifdef WANT_IPV6_DNS -int __dns_fd6=-1; -#endif - -/* the ad-hoc internal API from hell ;-) */ -void __dns_make_fd(void); -void __dns_make_fd6(void); -void __dns_readstartfiles(void); -int __dns_decodename(unsigned char *packet,unsigned int offset,unsigned char *dest, - unsigned int maxlen,unsigned char* behindpacket); - -void __dns_make_fd(void) { - int tmp; - struct sockaddr_in si; - if (__dns_fd>=0) return; - tmp=socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP); - if (tmp<0) return; - si.sin_family=AF_INET; - si.sin_port=0; - si.sin_addr.s_addr=INADDR_ANY; - if (bind(tmp,(struct sockaddr*)&si,sizeof(si))) return; - __dns_fd=tmp; -} - -#ifdef WANT_IPV6_DNS -void __dns_make_fd6(void) { - int tmp; - struct sockaddr_in6 si; - if (__dns_fd6>=0) return; - tmp=socket(PF_INET6,SOCK_DGRAM,IPPROTO_UDP); - if (tmp<0) return; - si.sin6_family=AF_INET6; - si.sin6_port=0; - memset(&si.sin6_addr,0,16); - if (bind(tmp,(struct sockaddr*)&si,sizeof(si))) return; - __dns_fd6=tmp; -} -#endif - -static int parsesockaddr(const char* c,void* x) { - struct sockaddr_in to; - if (inet_aton(c,&to.sin_addr)) { - to.sin_port=htons(53); - to.sin_family=AF_INET; - memmove(x,&to,sizeof(struct sockaddr_in_pad)); - return 1; -#ifdef WANT_IPV6_DNS - } else { - struct sockaddr_in6 to6; - char* d=strchr(c,'%'); - to6.sin6_flowinfo=to6.sin6_scope_id=0; - if (d) - to6.sin6_scope_id=if_nametoindex(d+1); - if (inet_pton(AF_INET6,c,&to6.sin6_addr)) { - to6.sin6_port=htons(53); - to6.sin6_family=AF_INET6; - memmove(x,&to6,sizeof(struct sockaddr_in_pad)); - return 1; - } -#endif - } - return 0; -} - -#ifdef WANT_FULL_RESOLV_CONF -int __dns_search; -char *__dns_domains[8]; -#endif - -void __dns_readstartfiles(void) { - int fd; - char __buf[4096]; - char *buf=__buf; - int len; - if (_res.nscount>0) return; - { - struct sockaddr_in to; -#ifdef WANT_IPV6_DNS - struct sockaddr_in6 to6; -#endif - char *cacheip=getenv("DNSCACHEIP"); -#ifdef WANT_FULL_RESOLV_CONF - __dns_search=0; -#endif - if (cacheip) - if (parsesockaddr(cacheip,_res.nsaddr_list)) - ++_res.nscount; - } - _res.options=RES_RECURSE; - if ((fd=open("/etc/resolv.conf",O_RDONLY))<0) return; - len=read(fd,buf,4096); - close(fd); - { - char *last=buf+len; - for (; buf<last;) { - if (!strncmp(buf,"nameserver",10)) { - buf+=10; - while (buf<last && *buf!='\n') { - while (buf<last && isblank(*buf)) ++buf; - { - char *tmp=buf; - struct sockaddr_in i; - char save; - while (buf<last && !isspace(*buf)) ++buf; - if (buf>=last) break; - save=*buf; - *buf=0; - if (parsesockaddr(tmp,&_res.nsaddr_list[_res.nscount])) - if (_res.nscount<MAXNS) ++_res.nscount; - *buf=save; - } - } - } -#ifdef WANT_FULL_RESOLV_CONF - else if (!strncmp(buf,"search",6) || !strncmp(buf,"domain",6)) { - buf+=6; - while (buf<last && *buf!='\n') { - char save; - while (buf<last && (*buf==',' || isblank(*buf))) ++buf; - __dns_domains[__dns_search]=buf; - while (buf<last && (*buf=='.' || *buf=='-' || isalnum(*buf))) ++buf; - save=*buf; - if (buf<last) *buf=0; - if (__dns_domains[__dns_search]<buf && - (__dns_domains[__dns_search]=strdup(__dns_domains[__dns_search]))) - ++__dns_search; - if (buf<last) *buf=save; - } - continue; - } -#endif - while (buf<last && *buf!='\n') ++buf; - while (buf<last && *buf=='\n') ++buf; - } - } -} - -/* return length of decoded data or -1 */ -int __dns_decodename(unsigned char *packet,unsigned int offset,unsigned char *dest, - unsigned int maxlen,unsigned char* behindpacket) { - unsigned char *tmp; - unsigned char *max=dest+maxlen; - unsigned char *after=packet+offset; - int ok=0; - for (tmp=after; maxlen>0&&*tmp; ) { - if (tmp>=behindpacket) return -1; - if ((*tmp>>6)==3) { /* goofy DNS decompression */ - unsigned int ofs=((unsigned int)(*tmp&0x3f)<<8)|*(tmp+1); - if (ofs>=(unsigned int)offset) return -1; /* RFC1035: "pointer to a _prior_ occurrance" */ - if (after<tmp+2) after=tmp+2; - tmp=packet+ofs; - ok=0; - } else { - unsigned int duh; - if (dest+*tmp+1>max) return -1; - if (tmp+*tmp+1>=behindpacket) return -1; - for (duh=*tmp; duh>0; --duh) - *dest++=*++tmp; - *dest++='.'; ok=1; - ++tmp; - if (tmp>after) { after=tmp; if (!*tmp) ++after; } - } - } - if (ok) --dest; - *dest=0; - return after-packet; -} |