int slirp_get_system_dns_servers(void)
{
char buff[512];
char buff2[257];
FILE *f;
if (dns_addr_count > 0)
return dns_addr_count;
#ifdef CONFIG_DARWIN
/* on Darwin /etc/resolv.conf is a symlink to /private/var/run/resolv.conf
* in some siutations, the symlink can be destroyed and the system will not
* re-create it. Darwin-aware applications will continue to run, but "legacy"
* Unix ones will not.
*/
f = fopen("/private/var/run/resolv.conf", "r");
if (!f)
f = fopen("/etc/resolv.conf", "r"); /* desperate attempt to sanity */
#else
f = fopen("/etc/resolv.conf", "r");
#endif
if (!f)
return -1;
DN("emulator: IP address of your DNS(s): ");
while (fgets(buff, 512, f) != NULL) {
if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
uint32_t tmp_ip;
if (inet_strtoip(buff2, &tmp_ip) < 0)
continue;
if (tmp_ip == loopback_addr_ip)
tmp_ip = our_addr_ip;
if (dns_addr_count < DNS_ADDR_MAX) {
dns_addr[dns_addr_count++] = tmp_ip;
if (dns_addr_count > 1)
DN(", ");
DN("%s", inet_iptostr(tmp_ip));
} else {
DN("(more)");
break;
}
}
}
DN("\n");
fclose(f);
if (!dns_addr_count)
return -1;
return dns_addr_count;
}
int slirp_get_system_dns_servers(void)
{
char buff[512];
char buff2[257];
FILE *f;
if (dns_addr_count > 0)
return dns_addr_count;
#ifdef CONFIG_DARWIN
f = fopen("/private/var/run/resolv.conf", "r");
if (!f)
f = fopen("/etc/resolv.conf", "r");
#else
f = fopen("/etc/resolv.conf", "r");
#endif
if (!f)
return -1;
DN("emulator: IP address of your DNS(s): ");
while (fgets(buff, 512, f) != NULL) {
if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
uint32_t tmp_ip;
if (inet_strtoip(buff2, &tmp_ip) < 0)
continue;
if (tmp_ip == loopback_addr_ip)
tmp_ip = our_addr_ip;
if (dns_addr_count < DNS_ADDR_MAX) {
dns_addr[dns_addr_count++] = tmp_ip;
if (dns_addr_count > 1)
DN(", ");
DN("%s", inet_iptostr(tmp_ip));
} else {
DN("(more)");
break;
}
}
}
DN("\n");
fclose(f);
if (!dns_addr_count)
return -1;
return dns_addr_count;
}
void
icmp_error(struct mbuf *msrc, u_char type, u_char code, int minsize,
const char *message)
{
unsigned hlen, shlen, s_ip_len;
register struct ip *ip;
register struct icmp *icp;
register struct mbuf *m;
DEBUG_CALL("icmp_error");
DEBUG_ARG("msrc = %lx", (long )msrc);
DEBUG_ARG("msrc_len = %d", msrc->m_len);
if(type!=ICMP_UNREACH && type!=ICMP_TIMXCEED) goto end_error;
/* check msrc */
if(!msrc) goto end_error;
ip = mtod(msrc, struct ip *);
#ifdef DEBUG
{ char bufa[20], bufb[20];
strcpy(bufa, inet_iptostr(ip_geth(ip->ip_src)));
strcpy(bufb, inet_iptostr(ip_geth(ip->ip_dst)));
DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
}
#endif
if(ip->ip_off & IP_OFFMASK) goto end_error; /* Only reply to fragment 0 */
shlen=ip->ip_hl << 2;
s_ip_len=ip->ip_len;
if(ip->ip_p == IPPROTO_ICMP) {
icp = (struct icmp *)((char *)ip + shlen);
/*
* Assume any unknown ICMP type is an error. This isn't
* specified by the RFC, but think about it..
*/
if(icp->icmp_type>18 || icmp_flush[icp->icmp_type]) goto end_error;
}
/* make a copy */
if(!(m=m_get())) goto end_error; /* get mbuf */
{ int new_m_size;
new_m_size=sizeof(struct ip )+ICMP_MINLEN+msrc->m_len+ICMP_MAXDATALEN;
if(new_m_size>m->m_size) m_inc(m, new_m_size);
}
memcpy(m->m_data, msrc->m_data, msrc->m_len);
m->m_len = msrc->m_len; /* copy msrc to m */
/* make the header of the reply packet */
ip = mtod(m, struct ip *);
hlen= sizeof(struct ip ); /* no options in reply */
/* fill in icmp */
m->m_data += hlen;
m->m_len -= hlen;
icp = mtod(m, struct icmp *);
if(minsize) s_ip_len=shlen+ICMP_MINLEN; /* return header+8b only */
else if(s_ip_len>ICMP_MAXDATALEN) /* maximum size */
s_ip_len=ICMP_MAXDATALEN;
m->m_len=ICMP_MINLEN+s_ip_len; /* 8 bytes ICMP header */
/* min. size = 8+sizeof(struct ip)+8 */
icp->icmp_type = type;
icp->icmp_code = code;
icp->icmp_id = 0;
icp->icmp_seq = 0;
memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
HTONS(icp->icmp_ip.ip_len);
HTONS(icp->icmp_ip.ip_id);
HTONS(icp->icmp_ip.ip_off);
#ifdef DEBUG
if(message) { /* DEBUG : append message to ICMP packet */
int message_len;
char *cpnt;
message_len=strlen(message);
if(message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN;
cpnt=(char *)m->m_data+m->m_len;
memcpy(cpnt, message, message_len);
m->m_len+=message_len;
}
#endif
icp->icmp_cksum = 0;
icp->icmp_cksum = cksum(m, m->m_len);
m->m_data -= hlen;
m->m_len += hlen;
/* fill in ip */
ip->ip_hl = hlen >> 2;
ip->ip_len = m->m_len;
ip->ip_tos=((ip->ip_tos & 0x1E) | 0xC0); /* high priority for errors */
ip->ip_ttl = MAXTTL;
ip->ip_p = IPPROTO_ICMP;
ip->ip_dst = ip->ip_src; /* ip adresses */
ip->ip_src = ip_setn(alias_addr_ip);
(void ) ip_output((struct socket *)NULL, m);
STAT(icmpstat.icps_reflect++);
end_error:
return;
}
