aniani/irssi
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Code

Make DNS work in capability mode.

Browse Source 
Signed-off-by: Edward Tomasz Napierala <trasz@FreeBSD.org>
This commit is contained in:
Edward Tomasz Napierala 2017-07-28 02:21:40 +01:00
parent f4546be7ec
commit 509eca76f0
3 changed files with 142 additions and 37 deletions
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173
src/core/capsicum.c
View File

@ -31,6 +31,9 @@
#include <sys/socket.h>
#include <string.h>
#define OPCODE_CONNECT 1
#define OPCODE_GETHOSTBYNAME 2
static int symbiontfds[2];
gboolean capsicum_enabled(void)
@ -55,6 +58,7 @@ int capsicum_net_connect_ip(IPADDR *ip, int port, IPADDR *my_ip)
/* Send request to the symbiont. */
nvl = nvlist_create(0);
nvlist_add_number(nvl, "opcode", OPCODE_CONNECT);
nvlist_add_binary(nvl, "ip", ip, sizeof(*ip));
nvlist_add_number(nvl, "port", port);
if (my_ip != NULL) {
@ -86,12 +90,139 @@ int capsicum_net_connect_ip(IPADDR *ip, int port, IPADDR *my_ip)
return sock;
}
int capsicum_net_gethostbyname(const char *addr, IPADDR *ip4, IPADDR *ip6)
{
nvlist_t *nvl;
IPADDR *received_ip4, *received_ip6;
int error, ret, saved_errno;
/* Send request to the symbiont. */
nvl = nvlist_create(0);
nvlist_add_number(nvl, "opcode", OPCODE_GETHOSTBYNAME);
nvlist_add_string(nvl, "addr", addr);
error = nvlist_send(symbiontfds[1], nvl);
nvlist_destroy(nvl);
if (error != 0) {
g_warning("nvlist_send: %s", strerror(errno));
return -1;
}
/* Receive response. */
nvl = nvlist_recv(symbiontfds[1], 0);
if (nvl == NULL) {
g_warning("nvlist_recv: %s", strerror(errno));
return -1;
}
received_ip4 = nvlist_get_binary(nvl, "ip4", NULL);
received_ip6 = nvlist_get_binary(nvl, "ip6", NULL);
memcpy(ip4, received_ip4, sizeof(*ip4));
memcpy(ip6, received_ip6, sizeof(*ip6));
ret = nvlist_get_number(nvl, "ret");
saved_errno = nvlist_get_number(nvl, "errno");
nvlist_destroy(nvl);
errno = saved_errno;
return ret;
}
nvlist_t *symbiont_connect(const nvlist_t *request)
{
nvlist_t *response;
IPADDR *ip, *my_ip;
int port, saved_errno, sock;
ip = nvlist_get_binary(request, "ip", NULL);
port = (int)nvlist_get_number(request, "port");
if (nvlist_exists(request, "my_ip"))
my_ip = nvlist_get_binary(request, "my_ip", NULL);
else
my_ip = NULL;
/* Connect. */
sock = net_connect_ip_handle(ip, port, my_ip);
saved_errno = errno;
/* Send back the socket fd. */
response = nvlist_create(0);
if (sock != -1)
nvlist_move_descriptor(response, "sock", sock);
nvlist_add_number(response, "errno", saved_errno);
return (response);
}
nvlist_t *symbiont_gethostbyname(const nvlist_t *request)
{
nvlist_t *response;
IPADDR ip4, ip6;
const char *addr;
int ret, saved_errno;
addr = nvlist_get_string(request, "addr");
/* Connect. */
ret = net_gethostbyname(addr, &ip4, &ip6);
saved_errno = errno;
/* Send back the IPs. */
response = nvlist_create(0);
nvlist_add_number(response, "ret", ret);
nvlist_add_number(response, "errno", saved_errno);
nvlist_add_binary(response, "ip4", &ip4, sizeof(ip4));
nvlist_add_binary(response, "ip6", &ip6, sizeof(ip6));
return (response);
}
/*
* Child process, running outside the Capsicum sandbox.
*/
_Noreturn static void symbiont(void)
{
nvlist_t *request, *response;
int error, opcode;
setproctitle("capsicum symbiont");
close(symbiontfds[1]);
close(0);
close(1);
close(2);
for (;;) {
/* Receive parameters from the main irssi process. */
request = nvlist_recv(symbiontfds[0], 0);
if (request == NULL)
exit(1);
opcode = nvlist_get_number(request, "opcode");
switch (opcode) {
case OPCODE_CONNECT:
response = symbiont_connect(request);
break;
case OPCODE_GETHOSTBYNAME:
response = symbiont_gethostbyname(request);
break;
default:
exit(1);
}
/* Send back the response. */
error = nvlist_send(symbiontfds[0], response);
if (error != 0)
exit(1);
nvlist_destroy(request);
nvlist_destroy(response);
}
}
static int start_symbiont(void)
{
int childfd, error;
pid_t pid;
nvlist_t *nvl;
IPADDR *ip, *my_ip;
int childfd, error, port, saved_errno, sock;
error = socketpair(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, symbiontfds);
if (error != 0) {
@ -110,40 +241,8 @@ static int start_symbiont(void)
return 0;
}
/* We're the child, running outside the Capsicum sandbox. */
setproctitle("capsicum symbiont");
close(symbiontfds[1]);
close(0);
close(1);
close(2);
for (;;) {
/* Receive parameters from the main irssi process. */
nvl = nvlist_recv(symbiontfds[0], 0);
if (nvl == NULL)
exit(1);
ip = nvlist_get_binary(nvl, "ip", NULL);
port = (int)nvlist_get_number(nvl, "port");
if (nvlist_exists(nvl, "my_ip"))
my_ip = nvlist_get_binary(nvl, "my_ip", NULL);
else
my_ip = NULL;
/* Connect. */
sock = net_connect_ip_handle(ip, port, my_ip);
saved_errno = errno;
/* Send back the socket fd. */
nvlist_destroy(nvl);
nvl = nvlist_create(0);
if (sock != -1)
nvlist_move_descriptor(nvl, "sock", sock);
nvlist_add_number(nvl, "errno", saved_errno);
error = nvlist_send(symbiontfds[0], nvl);
if (error != 0)
exit(1);
nvlist_destroy(nvl);
}
symbiont();
/* NOTREACHED */
}
static void cmd_capsicum(const char *data, SERVER_REC *server, void *item)

1
src/core/capsicum.h
View File

@ -3,6 +3,7 @@
gboolean capsicum_enabled(void);
int capsicum_net_connect_ip(IPADDR *ip, int port, IPADDR *my_ip);
int capsicum_net_gethostbyname(const char *addr, IPADDR *ip4, IPADDR *ip6);
void capsicum_init(void);
void capsicum_deinit(void);

5
src/core/network.c
View File

@ -406,6 +406,11 @@ int net_gethostbyname(const char *addr, IPADDR *ip4, IPADDR *ip6)
struct addrinfo hints, *ai, *ailist;
int ret, count_v4, count_v6, use_v4, use_v6;
#ifdef HAVE_CAPSICUM
if (capsicum_enabled())
return (capsicum_net_gethostbyname(addr, ip4, ip6));
#endif
g_return_val_if_fail(addr != NULL, -1);
memset(ip4, 0, sizeof(IPADDR));