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mirror of https://github.com/PHJArea217/socket-enhancer synced 2024-11-01 00:30:59 +02:00

Bind profiles (incomplete)

This commit is contained in:
Peter H. Jin 2022-07-02 02:55:45 -04:00
parent 63e9c04710
commit 01fb5ff448

View File

@ -12,6 +12,196 @@ struct ipv6_with_scope {
struct in6_addr address; struct in6_addr address;
uint32_t scope_id; uint32_t scope_id;
}; };
struct bind_profile {
uint16_t idx;
uint8_t has_if:1;
uint8_t has_if_name:1;
uint8_t has_fwmark:1;
uint8_t set_transparent:1;
uint8_t has_bind_address:1;
uint32_t fwmark;
union {
char *ifname;
uint32_t ifindex;
} bind_interface;
struct in6_addr bind_address;
};
struct socket_enhancer_config {
int (*real_bind)(int, const struct sockaddr *, socklen_t);
int (*real_connect)(int, const struct sockaddr *, socklen_t);
struct in_addr ipv4_default;
struct in_addr ipv4_loopback;
uint8_t universal_link_local_mode;
uint8_t always_freebind;
uint8_t has_v4_default:1;
uint8_t has_v4_loopback:1;
uint8_t has_v6_default:1;
uint8_t has_v6_v4mapv6:1;
uint8_t has_v6_linklocal:1;
uint8_t has_v6_uniquelocal:1;
struct ipv6_with_scope ipv6_default;
struct ipv6_with_scope ipv6_v4mapv6;
struct ipv6_with_scope ipv6_linklocal;
struct ipv6_with_scope ipv6_uniquelocal;
struct bind_profile *bind_profile_head;
size_t bind_profile_size;
};
static int handle_bind_profile(int socket_fd, const struct bind_profile *profile, int do_bind_address, struct socket_enhancer_config *config) {
if (profile->has_fwmark) {
if (setsockopt(socket_fd, SOL_SOCKET, SO_MARK, &profile->fwmark, sizeof(uint32_t))) return -1;
}
if (profile->set_transparent) {
int one = 1;
if (setsockopt(socket_fd, SOL_IP, IP_TRANSPARENT, &one, sizeof(one))) {
return -1;
}
}
if (profile->has_if) {
if (profile->has_if_name) {
if (setsockopt(socket_fd, SOL_SOCKET, SO_BINDTODEVICE, profile->bind_interface.ifname, strlen(profile->bind_interface.ifname) + 1)) {
return -1;
}
} else {
if (setsockopt(socket_fd, SOL_SOCKET, SO_BINDTOIFINDEX, &profile->bind_interface.ifindex, sizeof(uint32_t))) {
return -1;
}
}
}
if (do_bind_address && profile->has_bind_address) {
int one = 1;
setsockopt(fd, SOL_IP, IP_BIND_ADDRESS_NO_PORT, &one, sizeof(one));
struct sockaddr_in new_bind_addr = {};
struct sockaddr_in6 new_bind_addr6 = {};
int sock_type = AF_UNSPEC;
socklen_t sock_type_len = sizeof(int);
if (getsockopt(socket_fd, SOL_SOCKET, SO_DOMAIN, &sock_type, &sock_type_len)) return -1;
if (sock_type_len != sizeof(int)) return -1;
switch (sock_type) {
case AF_INET:
if (IN6_IS_ADDR_V4MAPPED(&profile->bind_address)) {
new_bind_addr.sin_family = AF_INET;
new_bind_addr.sin_port = 0;
new_bind_addr.sin_addr = profile->bind_address.s6_addr32[3];
if (config->real_bind(socket_fd, (struct sockaddr *) &new_bind_addr, sizeof(new_bind_addr))) return -1;
} else {
errno = EADDRNOTAVAIL;
return -1;
}
break;
case AF_INET6:
new_bind_addr6.sin6_family = AF_INET6;
new_bind_addr6.sin6_port = 0;
memcpy(&new_bind_addr6.sin6_addr, &profile->bind_address, sizeof(struct in6_addr));
if (config->real_bind(socket_fd, (struct sockaddr *) &new_bind_addr6, sizeof(new_bind_addr6))) return -1;
break;
default:
errno = ENOPROTOOPT;
return -1;
}
}
return 0;
}
static int get_idx_by_address(const struct sockaddr *addr, socklen_t len) {
uint32_t ipv4_address = 0;
if ((len == sizeof(struct sockaddr_in6)) && (addr->sa_family == AF_INET6)) {
const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *) addr;
if (IN6_IS_ADDR_V4MAPPED(&addr6->sin6_addr)) {
ipv4_address = ntohl(addr6->sin6_addr.s6_addr32[3]);
goto ipv4;
#if __BYTE_ORDER == __LITTLE_ENDIAN
} else if ((addr6->sin6_addr.s6_addr32[0] == 0x00808ffeU)
#else
} else if ((addr6->sin6_addr.s6_addr32[0] == 0xfe8f8000U)
#endif
&& (addr6->sin6_addr.s6_addr32[1] == 0U) && (addr6->sin6_addr.s6_addr32[2] == 0U) && (addr6->sin6_addr.s6_addr16[6] == 0U)) {
uint16_t idxval_r = ntohs(addr6->sin6_addr.s6_addr16[7]);
if (idxval_r & 0x8000U) {
return idxval_r;
}
} else if (IN6_IS_ADDR_LINKLOCAL(&addr6->sin6_addr)) return 63;
else if (IN6_IS_ADDR_LOOPBACK(&addr6->sin6_addr)) return 61;
else return 60;
} else if ((len == sizeof(struct sockaddr_in)) && (addr->sa_family == AF_INET)) {
const struct sockaddr_in *addr4 = (const struct sockaddr_in *) addr;
ipv4_address = ntohl(addr4->sin_addr.s_addr);
goto ipv4;
}
return -1;
ipv4:
if ((ipv4_address & 0xffffc000U) == 0x7fa74000U) {
return 0x4000U | (ipv4_address & 0x4000U);
} else if ((ipv4_address & 0xff000000U) == 0x7f000000U) {
return 41;
} else {
return 40;
}
}
static int parse_bind_profile_string(const char *input_string, struct bind_profile *result) {
memset(result, 0, sizeof(struct bind_profile));
char *saveptr = NULL;
char *input_string_d = strdup(input_string);
if (!input_string_d) return -1;
char *idx_str = strtok(input_string_d, "/", &saveptr);
if (!idx_str) goto out;
unsigned long idx_num = strtoul(idx_str, NULL, 0);
if ((idx_num == 0) || (idx_num > 65535)) goto out;
result->idx = idx_num;
while (1) {
char *token = strtok(NULL, "/", &saveptr);
if (!token) break;
switch (token[0]) {
case 'M':
if (result->has_fwmark) goto out;
errno = 0;
unsigned long fwmark = strtoul(&token[1], NULL, 0);
if (errno || (fwmark > 4294967295UL)) goto out;
result->has_fwmark = 1;
result->fwmark = fwmark;
break;
case 'D':
if (result->has_if) goto out;
char *ifname = strdup(&token[1]);
if (!ifname) goto out;
result->bind_interface.ifname = ifname;
result->has_if = 1;
result->has_if_name = 1;
break;
case 'I':
if (result->has_if) goto out;
errno = 0;
unsigned long ifindex = strtoul(&token[1], NULL, 0);
if (errno || (ifindex > 4294967295UL)) goto out;
result->bind_interface.ifindex = ifindex;
result->has_if = 1;
result->has_if_name = 0;
break;
case 'T':
result->set_transparent = 1;
break;
case 'B':
if (result->has_bind_address) goto out;
if (strchr(&token[1], ':')) {
if (inet_pton(AF_INET6, &token[1], &result->bind_address) != 1) goto out;
} else {
result->bind_address.s6_addr32[0] = 0;
result->bind_address.s6_addr32[1] = 0;
result->bind_address.s6_addr16[4] = 0;
result->bind_address.s6_addr16[5] = 0xffffU;
if (inet_pton(AF_INET, &token[1], &result->bind_address.s6_addr32[3]) != 1) goto out;
}
result->has_bind_address = 1;
break;
default:
goto out;
}
}
free(input_string_d);
return 0;
out:
if (result->has_if_name) free(result->bind_interface.ifname);
free(input_string_d);
return -1;
}
static int parse_ipv6_with_scope(char *str, struct ipv6_with_scope *result) { static int parse_ipv6_with_scope(char *str, struct ipv6_with_scope *result) {
char *percent_brk = strchr(str, '%'); char *percent_brk = strchr(str, '%');
if (percent_brk) { if (percent_brk) {
@ -36,24 +226,6 @@ static int parse_ipv6_with_scope(char *str, struct ipv6_with_scope *result) {
} }
return 0; return 0;
} }
struct socket_enhancer_config {
int (*real_bind)(int, const struct sockaddr *, socklen_t);
int (*real_connect)(int, const struct sockaddr *, socklen_t);
struct in_addr ipv4_default;
struct in_addr ipv4_loopback;
uint8_t universal_link_local_mode;
uint8_t always_freebind;
uint8_t has_v4_default:1;
uint8_t has_v4_loopback:1;
uint8_t has_v6_default:1;
uint8_t has_v6_v4mapv6:1;
uint8_t has_v6_linklocal:1;
uint8_t has_v6_uniquelocal:1;
struct ipv6_with_scope ipv6_default;
struct ipv6_with_scope ipv6_v4mapv6;
struct ipv6_with_scope ipv6_linklocal;
struct ipv6_with_scope ipv6_uniquelocal;
};
static struct socket_enhancer_config *global_config = NULL; static struct socket_enhancer_config *global_config = NULL;
static void parse_v4(const char *addr, struct in_addr *result) { static void parse_v4(const char *addr, struct in_addr *result) {
if (inet_pton(AF_INET, addr, result) != 1) { if (inet_pton(AF_INET, addr, result) != 1) {