arti/socket-enhancer
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Add unilateral bind profiles for all IPv4/IPv6 sockets

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This commit is contained in:
Peter H. Jin 2022-07-02 16:17:08 -04:00
parent 23836a6560
commit 58b5196793
1 changed files with 23 additions and 0 deletions
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23
socket-enhancer.c
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@ -8,6 +8,7 @@
#include <netinet/in.h> #include <netinet/in.h>
#include <net/if.h> #include <net/if.h>
#include <dlfcn.h> #include <dlfcn.h>
#include <unistd.h>
struct ipv6_with_scope { struct ipv6_with_scope {
struct in6_addr address; struct in6_addr address;
uint32_t scope_id; uint32_t scope_id;
@ -29,6 +30,7 @@ struct bind_profile {
struct socket_enhancer_config { struct socket_enhancer_config {
int (*real_bind)(int, const struct sockaddr *, socklen_t); int (*real_bind)(int, const struct sockaddr *, socklen_t);
int (*real_connect)(int, const struct sockaddr *, socklen_t); int (*real_connect)(int, const struct sockaddr *, socklen_t);
int (*real_socket)(int, int, int);
struct in_addr ipv4_default; struct in_addr ipv4_default;
struct in_addr ipv4_loopback; struct in_addr ipv4_loopback;
uint8_t universal_link_local_mode; uint8_t universal_link_local_mode;
@ -281,10 +283,13 @@ static void socket_enhancer_init(void) {
if (!real_bind_p) abort(); if (!real_bind_p) abort();
void *real_connect_p = dlsym(RTLD_NEXT, "connect"); void *real_connect_p = dlsym(RTLD_NEXT, "connect");
if (!real_connect_p) abort(); if (!real_connect_p) abort();
void *real_socket_p = dlsym(RTLD_NEXT, "socket");
if (!real_socket_p) abort();
struct socket_enhancer_config *temp_config = calloc(sizeof(struct socket_enhancer_config), 1); struct socket_enhancer_config *temp_config = calloc(sizeof(struct socket_enhancer_config), 1);
if (!temp_config) abort(); if (!temp_config) abort();
temp_config->real_bind = real_bind_p; temp_config->real_bind = real_bind_p;
temp_config->real_connect = real_connect_p; temp_config->real_connect = real_connect_p;
temp_config->real_socket = real_socket_p;
const char *config_str = getenv("SOCKET_ENHANCER_CONFIG"); const char *config_str = getenv("SOCKET_ENHANCER_CONFIG");
if (config_str) { if (config_str) {
char *dup_configstr = strdup(config_str); char *dup_configstr = strdup(config_str);
@ -553,3 +558,21 @@ int bind(int fd, const struct sockaddr *addr_, socklen_t len_) {
} }
return config->real_bind(fd, addr, len); return config->real_bind(fd, addr, len);
} }
int socket(int domain, int type, int protocol) {
struct socket_enhancer_config *config = __atomic_load_n(&global_config, __ATOMIC_SEQ_CST);
if (!config) abort();
int socket_return = config->real_socket(domain, type, protocol);
if (socket_return < 0) return -1;
switch (domain) {
case AF_INET:
if (apply_bind_profile(socket_return, 4, 0, config, 0) < 0) goto out;
break;
case AF_INET6:
if (apply_bind_profile(socket_return, 6, 0, config, 0) < 0) goto out;
break;
}
return socket_return;
out:
close(socket_return);
return -1;
}