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Added DNS lookup on launch

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This commit is contained in:
Curtis Jiang 2020-01-11 04:29:20 -05:00
parent 5cc304a261
commit 2dd0f4f108
1 changed files with 47 additions and 2 deletions
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49
common.cpp
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@ -4,6 +4,9 @@
* Created on: Jul 29, 2017
* Author: wangyu
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include "common.h"
#include "log.h"
@ -22,16 +25,58 @@ int address_t::from_str(char *str)
char ip_addr_str[100];u32_t port;
mylog(log_info,"parsing address: %s\n",str);
int is_ipv6=0;
int is_ipv4=0;
if(sscanf(str, "[%[^]]]:%u", ip_addr_str,&port)==2)
{
mylog(log_info,"its an ipv6 adress\n");
inner.ipv6.sin6_family=AF_INET6;
is_ipv6=1;
}
else if(sscanf(str, "%[^:]:%u", ip_addr_str,&port)==2)
else if(sscanf(str, "%[0-9.]:%u", ip_addr_str,&port)==2)
{
mylog(log_info,"its an ipv4 adress\n");
inner.ipv4.sin_family=AF_INET;
is_ipv4=1;
}
else if (sscanf(str, "%[^:]:%u", ip_addr_str, &port) == 2)
{
struct addrinfo hints, *res;
int errcode;
char addrstr[100];
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags |= AI_CANONNAME;
errcode = getaddrinfo (ip_addr_str, NULL, &hints, &res);
if (errcode != 0)
{
mylog(log_error, "Unable to resolve hostname: %s\n", ip_addr_str);
return -1;
}
inet_ntop (res->ai_family, res->ai_addr->sa_data, addrstr, 100);
switch (res->ai_family)
{
case AF_INET:
inner.ipv4.sin_family=AF_INET;
inner.ipv4.sin_addr = ((struct sockaddr_in *) res->ai_addr)->sin_addr;
inner.ipv4.sin_port=htons(port);
mylog(log_info, "%s ip = %s\n", program_mode == client_mode ? "server" : "remote",
addrstr);
break;
case AF_INET6:
inner.ipv6.sin6_family=AF_INET6;
inner.ipv6.sin6_addr = ((struct sockaddr_in6 *) res->ai_addr)->sin6_addr;
inner.ipv6.sin6_port=htons(port);
mylog(log_info, "%s ip = %s\n", program_mode == client_mode ? "server" : "remote",
addrstr);
break;
default:
mylog(log_error, "WTF");
return -1;
}
}
else
{
@ -67,7 +112,7 @@ int address_t::from_str(char *str)
myexit(-1);
}
}
else
else if(is_ipv4)
{
ret=inet_pton(AF_INET, ip_addr_str,&(inner.ipv4.sin_addr));
inner.ipv4.sin_port=htons(port);