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#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <string.h>
extern int __ltostr(char *s, int size, unsigned long i, int base, char UpCase);
int getnameinfo(const struct sockaddr *sa, socklen_t salen, char *host,
size_t hostlen, char *serv, size_t servlen, int flags) {
sa_family_t f=((struct sockaddr_storage *)sa)->ss_family;
(void)salen; /* shut gcc up about unused salen */
if (host && hostlen>0) { /* user wants me to resolve the host name */
register const char*addr=(f==AF_INET6)?(char*)&((struct sockaddr_in6*)sa)->sin6_addr:
(char*)&((struct sockaddr_in*)sa)->sin_addr;
if (flags&NI_NUMERICHOST) {
if (!inet_ntop(f,addr,host,hostlen))
return EAI_NONAME;
} else {
char buf[4096];
struct hostent h;
struct hostent *H;
int herrno;
if (gethostbyaddr_r(addr,f==AF_INET6?16:4,f,&h,buf,4096,&H,&herrno)) {
switch (herrno) {
case TRY_AGAIN: return EAI_AGAIN;
case NO_DATA:
case HOST_NOT_FOUND: return EAI_NONAME;
}
}
strncpy(host,h.h_name,hostlen-1);
host[hostlen-1]=0;
}
}
if (serv && servlen>0) {
register short int port=(f==AF_INET6)?((struct sockaddr_in6*)sa)->sin6_port:((struct sockaddr_in*)sa)->sin_port;
if (flags&NI_NUMERICSERV) {
__ltostr(serv,servlen,ntohs(port),10,0);
} else {
struct servent *s;
if (!(s=getservbyport(port,flags&NI_DGRAM?"udp":"tcp")))
return EAI_SERVICE;
}
}
return 0;
}
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