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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"
/* for malloc/free */
#include <stdlib.h>
void
freeaddrinfo(struct addrinfo *res)
{
struct addrinfo *info;
while((info = res) != 0){
res = res->ai_next;
free(info->ai_canonname);
free(info->ai_addr);
free(info);
}
}
static int
sockfamily(char *addr)
{
if(strchr(addr, ':') != 0)
return AF_INET6;
else
return AF_INET;
}
static int
sockproto(char *proto)
{
if(strcmp(proto, "tcp") == 0)
return SOCK_STREAM;
if(strcmp(proto, "udp") == 0)
return SOCK_DGRAM;
if(strcmp(proto, "il") == 0)
return SOCK_RDM;
return 0;
}
static int
filladdrinfo(char *s, struct addrinfo *a, struct addrinfo *h)
{
struct sockaddr sa;
char *p, *q;
if(*s != '/')
return 1;
if((q = strchr(s, ' ')) == 0)
return 1;
while(*q == ' ')
*q++ = 0;
if((p = strrchr(s+1, '/')) == 0)
return 1;
*p = 0;
if((p = strrchr(s+1, '/')) == 0)
return 1;
*p++ = 0;
if(*p == 0)
return 1;
if((a->ai_socktype = sockproto(p)) == 0)
return 1;
if((p = strchr(q, '!')) != 0){
*p++ = 0;
a->ai_family = sockfamily(q);
} else{
p = q;
q = 0;
if((a->ai_family = h->ai_family) == 0)
a->ai_family = AF_INET;
}
if((a->ai_socktype == SOCK_RDM || h->ai_socktype != 0)
&& (a->ai_socktype != h->ai_socktype))
return 1;
if(h->ai_family != 0 && a->ai_family != h->ai_family)
return 1;
if(_sock_inaddr(a->ai_family, q, p, &sa, &a->ai_addrlen) <= 0)
return 1;
if((a->ai_addr = malloc(a->ai_addrlen)) == 0)
return EAI_MEMORY;
memmove(a->ai_addr, &sa, a->ai_addrlen);
return 0;
}
int
getaddrinfo(char *node, char *serv, struct addrinfo *hints, struct addrinfo **res)
{
static struct addrinfo nohints;
struct addrinfo *a, *head, **tail;
char buf[1024], *proto;
int n, fd, err;
if(res != 0)
*res = 0;
if(hints == 0)
hints = &nohints;
proto = "net";
switch(hints->ai_family){
default:
return EAI_FAMILY;
case AF_INET:
case AF_INET6:
switch(hints->ai_socktype){
default:
return EAI_SOCKTYPE;
case SOCK_STREAM:
proto = "tcp";
break;
case SOCK_DGRAM:
proto = "udp";
break;
case SOCK_RDM:
proto = "il";
break;
case 0:
break;
}
break;
case AF_UNSPEC:
break;
}
if(serv == 0){
if(node == 0)
return EAI_NONAME;
serv = "0";
}
if(node == 0){
if(hints->ai_flags & AI_PASSIVE)
node = "*";
else if(hints->ai_family == AF_INET6)
node = "::1";
else
node = "127.0.0.1";
}
if((fd = open("/net/cs", O_RDWR)) < 0)
return EAI_SYSTEM;
snprintf(buf, sizeof(buf), "%s!%s!%s", proto, node, serv);
n = strlen(buf);
if(write(fd, buf, n) != n){
close(fd);
return EAI_AGAIN;
}
lseek(fd, 0, 0);
head = 0;
tail = &head;
for(;;){
if((n = read(fd, buf, sizeof(buf)-1)) <= 0)
break;
buf[n] = '\0';
if((a = malloc(sizeof(*a))) == 0){
freeaddrinfo(head);
close(fd);
return EAI_MEMORY;
}
memset(a, 0, sizeof(*a));
if((err = filladdrinfo(buf, a, hints)) != 0){
freeaddrinfo(a);
if(err < 0){
freeaddrinfo(head);
close(fd);
return err;
}
} else {
*tail = a;
tail = &a->ai_next;
}
}
close(fd);
if(head == 0)
return EAI_NODATA;
if((hints->ai_flags & AI_CANONNAME) != 0 && (hints->ai_flags & AI_NUMERICHOST) == 0){
n = _sock_ipattr(node);
if(n != Tsys && n != Tdom){
if(getnameinfo(head->ai_addr, head->ai_addrlen, buf, sizeof(buf), 0, 0, NI_NAMEREQD) == 0)
node = buf;
else
node = 0;
}
if(node != 0){
n = strlen(node)+1;
if((head->ai_canonname = malloc(n)) == 0){
freeaddrinfo(head);
return EAI_MEMORY;
}
memmove(head->ai_canonname, node, n);
}
}
if(res != 0)
*res = head;
else
freeaddrinfo(head);
return 0;
}
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