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/* posix */
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
/* bsd extensions */
#include <sys/uio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include "priv.h"
static int
netquery(char *buf, int nbuf)
{
int fd, i, n;
if((fd = open("/net/cs", O_RDWR)) < 0)
return EAI_SYSTEM;
n = strlen(buf);
if(write(fd, buf, n) != n){
close(fd);
return EAI_NONAME;
}
lseek(fd, 0, 0);
for(i = 0; i < nbuf-1; i += n){
n = read(fd, buf+i, nbuf - 1 - i);
if(n <= 0)
break;
buf[i+n++] = ' ';
}
close(fd);
buf[i] = 0;
return i;
}
int
getnameinfo(struct sockaddr *sa, int salen,
char *host, int hostlen,
char *serv, int servlen,
unsigned int flags)
{
char buf[8*1024], *b, *p;
int err;
if(sa->sa_family != AF_INET && sa->sa_family != AF_INET6)
return EAI_FAMILY;
if(host != 0 && hostlen > 0){
if(inet_ntop(sa->sa_family, _sock_inip(sa), host, hostlen) == 0)
return EAI_SYSTEM;
if((flags & NI_NUMERICHOST) == 0){
snprintf(buf, sizeof(buf), "!ip=%s", host);
if((err = netquery(buf, sizeof(buf))) < 0){
if((flags & NI_NAMEREQD) != 0)
return err;
} else {
char *sys, *dom;
sys = dom = 0;
for(b = buf;;){
if((p = strchr(b, '=')) == 0)
break;
*p++ = 0;
if(strcmp(b, "sys") == 0)
sys = p;
else if(strcmp(b, "dom") == 0)
dom = p;
while(*p && *p != ' ')
p++;
while(*p == ' ')
*p++ = 0;
b = p;
}
if(sys == 0){
if(dom == 0 && (flags & NI_NAMEREQD) != 0)
return EAI_NONAME;
if(dom != 0 && (flags & NI_NOFQDN) != 0){
if((p = strchr(dom, '.')) != 0)
*p = 0;
}
sys = dom;
}
snprintf(host, hostlen, "%s", sys);
}
}
}
if(serv != 0 && servlen > 0){
snprintf(serv, servlen, "%d", _sock_inport(sa));
if((flags & NI_NUMERICSERV) == 0){
snprintf(buf, sizeof(buf), "!port=%s", serv);
if(netquery(buf, sizeof(buf)) > 0){
char *tcp, *udp;
tcp = udp = 0;
for(b = buf;;){
if((p = strchr(b, '=')) == 0)
break;
*p++ = 0;
if(strcmp(b, "tcp") == 0)
tcp = p;
else if(strcmp(b, "udp") == 0)
udp = p;
while(*p && *p != ' ')
p++;
while(*p == ' ')
*p++ = 0;
b = p;
}
if(udp != 0 && (flags & NI_DGRAM) != 0)
snprintf(serv, servlen, "%s", udp);
else if(tcp != 0)
snprintf(serv, servlen, "%s", tcp);
}
}
}
return 0;
}
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