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add support for "proxy_dns_old" to use old 3.1 DNS lookup method

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some lamer on IRC by the name of annoner/R3M0RS3/penis was complaining
that 3.1 is a lot better than proxychains-ng, because it happens to
work with the browser he's interested in.
since this wasn't the first time this is requested, let's give this
those lamers what they want: lame code!
This commit is contained in:
rofl0r
2020-09-20 22:11:17 +01:00
Unverified
parent 3e791fd797
commit 2ab631918d
5 changed files with 115 additions and 13 deletions
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src/core.c
+85 -1
View File
@@ -745,6 +745,86 @@ static void gethostbyname_data_setstring(struct gethostbyname_data* data, char*
}
extern ip_type4 hostsreader_get_numeric_ip_for_name(const char* name);
struct hostent* proxy_gethostbyname_old(const char *name)
{
static struct hostent hostent_space;
static in_addr_t resolved_addr;
static char* resolved_addr_p;
static char addr_name[1024*8];
int pipe_fd[2];
char buff[256];
in_addr_t addr;
pid_t pid;
int status;
size_t l;
struct hostent* hp;
hostent_space.h_addr_list = &resolved_addr_p;
*hostent_space.h_addr_list = (char*)&resolved_addr;
resolved_addr = 0;
gethostname(buff,sizeof(buff));
if(!strcmp(buff,name))
goto got_buff;
memset(buff, 0, sizeof(buff));
// TODO: this works only once, so cache it ...
// later
while ((hp=gethostent()))
if (!strcmp(hp->h_name,name))
return hp;
if(pipe(pipe_fd))
goto err;
pid = fork();
switch(pid) {
case 0: // child
proxychains_write_log("|DNS-request| %s \n", name);
close(pipe_fd[0]);
dup2(pipe_fd[1],1);
close(pipe_fd[1]);
// putenv("LD_PRELOAD=");
execlp("proxyresolv","proxyresolv",name,NULL);
perror("can't exec proxyresolv");
exit(2);
case -1: //error
close(pipe_fd[0]);
close(pipe_fd[1]);
perror("can't fork");
goto err;
default:
close(pipe_fd[1]);
waitpid(pid, &status, 0);
buff[0] = 0;
read(pipe_fd[0],&buff,sizeof(buff));
close(pipe_fd[0]);
got_buff:
l = strlen(buff);
if(l && buff[l-1] == '\n') buff[l-1] = 0;
addr = inet_addr(buff);
if (addr == (in_addr_t) (-1))
goto err_dns;
memcpy(*(hostent_space.h_addr_list),
&addr ,sizeof(struct in_addr));
hostent_space.h_name = addr_name;
hostent_space.h_length = sizeof (in_addr_t);
}
proxychains_write_log("|DNS-response| %s is %s\n",
name, inet_ntoa(*(struct in_addr*)&addr));
return &hostent_space;
err_dns:
proxychains_write_log("|DNS-response|: %s does not exist\n", name);
perror("err_dns");
err:
return NULL;
}
struct hostent *proxy_gethostbyname(const char *name, struct gethostbyname_data* data) {
PFUNC();
char buff[256];
@@ -872,7 +952,11 @@ int proxy_getaddrinfo(const char *node, const char *service, const struct addrin
free(space);
return EAI_NONAME;
}
hp = proxy_gethostbyname(node, &ghdata);
if(proxychains_resolver == 2)
hp = proxy_gethostbyname_old(node);
else
hp = proxy_gethostbyname(node, &ghdata);
if(hp)
memcpy(&((struct sockaddr_in *) &space->sockaddr_space)->sin_addr,
*(hp->h_addr_list), sizeof(in_addr_t));