diff options
Diffstat (limited to 'mdk-stage1/dietlibc/libugly/gethostent.c')
-rw-r--r-- | mdk-stage1/dietlibc/libugly/gethostent.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/mdk-stage1/dietlibc/libugly/gethostent.c b/mdk-stage1/dietlibc/libugly/gethostent.c new file mode 100644 index 000000000..fe92beacf --- /dev/null +++ b/mdk-stage1/dietlibc/libugly/gethostent.c @@ -0,0 +1,116 @@ +#include <unistd.h> +#include <fcntl.h> +#include <netdb.h> +#include <sys/mman.h> +#include <errno.h> +#include <netinet/in.h> +#include <string.h> +#include <ctype.h> +#include <netdb.h> +#include <sys/socket.h> +#include <arpa/inet.h> +#include "dietfeatures.h" + +static char* hostmap=0; +static unsigned int hostlen; + +static char *cur; + +/* ::1 localhost6 alias1 alias2 # internet protocol, pseudo protocol number */ +struct hostent* gethostent_r(char* buf, int len) { + char *dest; + struct hostent* pe=(struct hostent*)buf; + char* last; + char* max=buf+len; + int aliasidx; + if (!hostmap) { + int hostfd=open(_PATH_HOSTS,O_RDONLY); + if (hostfd<0) return 0; + hostlen=lseek(hostfd,0,SEEK_END); + hostmap=mmap(0,hostlen,PROT_READ|PROT_WRITE,MAP_PRIVATE,hostfd,0); + if ((long)hostmap==(-1)) { close(hostfd); hostmap=0; goto error; } + close(hostfd); hostfd=-1; + cur=hostmap; + } + last=hostmap+hostlen; +again: + if ((size_t)len<sizeof(struct hostent)+11*sizeof(char*)) goto nospace; + dest=buf+sizeof(struct hostent); + pe->h_name=0; + pe->h_aliases=(char**)dest; pe->h_aliases[0]=0; dest+=10*sizeof(char*); + pe->h_addr_list=(char**)dest; dest+=2*sizeof(char**); + if (cur>=last) return 0; + if (*cur=='#' || *cur=='\n') goto parseerror; + /* first, the ip number */ + pe->h_name=cur; + while (cur<last && !isspace(*cur)) cur++; + if (cur>=last) return 0; + if (*cur=='\n') goto parseerror; + { + char save=*cur; + *cur=0; + pe->h_addr_list[0]=dest; + pe->h_addr_list[1]=0; + if (max-dest<16) goto nospace; + if (inet_pton(AF_INET6,pe->h_name,dest)>0) { + pe->h_addrtype=AF_INET6; + pe->h_length=16; + dest+=16; + } else if (inet_pton(AF_INET,pe->h_name,dest)>0) { + pe->h_addrtype=AF_INET; + pe->h_length=4; + dest+=4; + } else { + *cur=save; + goto parseerror; + } + *cur=save; + } + ++cur; + /* now the aliases */ + for (aliasidx=0;aliasidx<9;++aliasidx) { + while (cur<last && isblank(*cur)) ++cur; + pe->h_aliases[aliasidx]=cur; + while (cur<last && !isspace(*cur)) ++cur; + { + char *from=pe->h_aliases[aliasidx]; + int len=cur-from; + if (max-dest<len+2) goto nospace; + pe->h_aliases[aliasidx]=dest; + memmove(dest,from,(size_t)(cur-from)); + dest+=len; + *dest=0; ++dest; + } + if (*cur=='\n') { ++cur; ++aliasidx; break; } + if (cur>=last || !isblank(*cur)) break; + cur++; + } + pe->h_aliases[aliasidx]=0; + pe->h_name=pe->h_aliases[0]; + pe->h_aliases++; + return pe; +parseerror: + while (cur<last && *cur!='\n') cur++; + cur++; + goto again; +nospace: + errno=ERANGE; + goto __error; +error: + errno=ENOMEM; +__error: + if (hostmap!=(char*)-1) munmap(hostmap,hostlen); + hostmap=(char*)-1; + return 0; +} + +void sethostent(int stayopen) { + (void)stayopen; + cur=hostmap; +} + +void endhostent(void) { + if (hostmap!=(char*)-1) munmap(hostmap,hostlen); + hostmap=0; +} + |