Bind profiles (incomplete)
This commit is contained in:
Peter H. Jin
parent
63e9c04710
commit
01fb5ff448
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@ -12,6 +12,196 @@ struct ipv6_with_scope {
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struct in6_addr address;
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uint32_t scope_id;
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};
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struct bind_profile {
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uint16_t idx;
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uint8_t has_if:1;
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uint8_t has_if_name:1;
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uint8_t has_fwmark:1;
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uint8_t set_transparent:1;
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uint8_t has_bind_address:1;
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uint32_t fwmark;
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union {
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char *ifname;
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uint32_t ifindex;
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} bind_interface;
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struct in6_addr bind_address;
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};
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struct socket_enhancer_config {
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int (*real_bind)(int, const struct sockaddr *, socklen_t);
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int (*real_connect)(int, const struct sockaddr *, socklen_t);
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struct in_addr ipv4_default;
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struct in_addr ipv4_loopback;
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uint8_t universal_link_local_mode;
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uint8_t always_freebind;
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uint8_t has_v4_default:1;
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uint8_t has_v4_loopback:1;
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uint8_t has_v6_default:1;
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uint8_t has_v6_v4mapv6:1;
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uint8_t has_v6_linklocal:1;
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uint8_t has_v6_uniquelocal:1;
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struct ipv6_with_scope ipv6_default;
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struct ipv6_with_scope ipv6_v4mapv6;
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struct ipv6_with_scope ipv6_linklocal;
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struct ipv6_with_scope ipv6_uniquelocal;
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struct bind_profile *bind_profile_head;
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size_t bind_profile_size;
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};
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static int handle_bind_profile(int socket_fd, const struct bind_profile *profile, int do_bind_address, struct socket_enhancer_config *config) {
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if (profile->has_fwmark) {
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if (setsockopt(socket_fd, SOL_SOCKET, SO_MARK, &profile->fwmark, sizeof(uint32_t))) return -1;
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}
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if (profile->set_transparent) {
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int one = 1;
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if (setsockopt(socket_fd, SOL_IP, IP_TRANSPARENT, &one, sizeof(one))) {
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return -1;
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}
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}
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if (profile->has_if) {
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if (profile->has_if_name) {
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if (setsockopt(socket_fd, SOL_SOCKET, SO_BINDTODEVICE, profile->bind_interface.ifname, strlen(profile->bind_interface.ifname) + 1)) {
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return -1;
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}
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} else {
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if (setsockopt(socket_fd, SOL_SOCKET, SO_BINDTOIFINDEX, &profile->bind_interface.ifindex, sizeof(uint32_t))) {
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return -1;
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}
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}
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}
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if (do_bind_address && profile->has_bind_address) {
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int one = 1;
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setsockopt(fd, SOL_IP, IP_BIND_ADDRESS_NO_PORT, &one, sizeof(one));
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struct sockaddr_in new_bind_addr = {};
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struct sockaddr_in6 new_bind_addr6 = {};
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int sock_type = AF_UNSPEC;
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socklen_t sock_type_len = sizeof(int);
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if (getsockopt(socket_fd, SOL_SOCKET, SO_DOMAIN, &sock_type, &sock_type_len)) return -1;
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if (sock_type_len != sizeof(int)) return -1;
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switch (sock_type) {
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case AF_INET:
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if (IN6_IS_ADDR_V4MAPPED(&profile->bind_address)) {
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new_bind_addr.sin_family = AF_INET;
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new_bind_addr.sin_port = 0;
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new_bind_addr.sin_addr = profile->bind_address.s6_addr32[3];
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if (config->real_bind(socket_fd, (struct sockaddr *) &new_bind_addr, sizeof(new_bind_addr))) return -1;
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} else {
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errno = EADDRNOTAVAIL;
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return -1;
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}
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break;
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case AF_INET6:
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new_bind_addr6.sin6_family = AF_INET6;
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new_bind_addr6.sin6_port = 0;
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memcpy(&new_bind_addr6.sin6_addr, &profile->bind_address, sizeof(struct in6_addr));
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if (config->real_bind(socket_fd, (struct sockaddr *) &new_bind_addr6, sizeof(new_bind_addr6))) return -1;
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break;
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default:
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errno = ENOPROTOOPT;
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return -1;
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}
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}
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return 0;
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}
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static int get_idx_by_address(const struct sockaddr *addr, socklen_t len) {
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uint32_t ipv4_address = 0;
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if ((len == sizeof(struct sockaddr_in6)) && (addr->sa_family == AF_INET6)) {
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const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *) addr;
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if (IN6_IS_ADDR_V4MAPPED(&addr6->sin6_addr)) {
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ipv4_address = ntohl(addr6->sin6_addr.s6_addr32[3]);
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goto ipv4;
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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} else if ((addr6->sin6_addr.s6_addr32[0] == 0x00808ffeU)
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#else
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} else if ((addr6->sin6_addr.s6_addr32[0] == 0xfe8f8000U)
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#endif
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&& (addr6->sin6_addr.s6_addr32[1] == 0U) && (addr6->sin6_addr.s6_addr32[2] == 0U) && (addr6->sin6_addr.s6_addr16[6] == 0U)) {
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uint16_t idxval_r = ntohs(addr6->sin6_addr.s6_addr16[7]);
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if (idxval_r & 0x8000U) {
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return idxval_r;
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}
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} else if (IN6_IS_ADDR_LINKLOCAL(&addr6->sin6_addr)) return 63;
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else if (IN6_IS_ADDR_LOOPBACK(&addr6->sin6_addr)) return 61;
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else return 60;
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} else if ((len == sizeof(struct sockaddr_in)) && (addr->sa_family == AF_INET)) {
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const struct sockaddr_in *addr4 = (const struct sockaddr_in *) addr;
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ipv4_address = ntohl(addr4->sin_addr.s_addr);
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goto ipv4;
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}
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return -1;
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ipv4:
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if ((ipv4_address & 0xffffc000U) == 0x7fa74000U) {
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return 0x4000U | (ipv4_address & 0x4000U);
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} else if ((ipv4_address & 0xff000000U) == 0x7f000000U) {
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return 41;
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} else {
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return 40;
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}
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}
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static int parse_bind_profile_string(const char *input_string, struct bind_profile *result) {
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memset(result, 0, sizeof(struct bind_profile));
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char *saveptr = NULL;
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char *input_string_d = strdup(input_string);
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if (!input_string_d) return -1;
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char *idx_str = strtok(input_string_d, "/", &saveptr);
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if (!idx_str) goto out;
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unsigned long idx_num = strtoul(idx_str, NULL, 0);
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if ((idx_num == 0) || (idx_num > 65535)) goto out;
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result->idx = idx_num;
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while (1) {
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char *token = strtok(NULL, "/", &saveptr);
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if (!token) break;
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switch (token[0]) {
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case 'M':
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if (result->has_fwmark) goto out;
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errno = 0;
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unsigned long fwmark = strtoul(&token[1], NULL, 0);
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if (errno || (fwmark > 4294967295UL)) goto out;
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result->has_fwmark = 1;
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result->fwmark = fwmark;
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break;
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case 'D':
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if (result->has_if) goto out;
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char *ifname = strdup(&token[1]);
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if (!ifname) goto out;
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result->bind_interface.ifname = ifname;
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result->has_if = 1;
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result->has_if_name = 1;
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break;
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case 'I':
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if (result->has_if) goto out;
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errno = 0;
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unsigned long ifindex = strtoul(&token[1], NULL, 0);
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if (errno || (ifindex > 4294967295UL)) goto out;
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result->bind_interface.ifindex = ifindex;
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result->has_if = 1;
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result->has_if_name = 0;
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break;
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case 'T':
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result->set_transparent = 1;
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break;
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case 'B':
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if (result->has_bind_address) goto out;
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if (strchr(&token[1], ':')) {
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if (inet_pton(AF_INET6, &token[1], &result->bind_address) != 1) goto out;
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} else {
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result->bind_address.s6_addr32[0] = 0;
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result->bind_address.s6_addr32[1] = 0;
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result->bind_address.s6_addr16[4] = 0;
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result->bind_address.s6_addr16[5] = 0xffffU;
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if (inet_pton(AF_INET, &token[1], &result->bind_address.s6_addr32[3]) != 1) goto out;
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}
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result->has_bind_address = 1;
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break;
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default:
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goto out;
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}
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}
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free(input_string_d);
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return 0;
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out:
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if (result->has_if_name) free(result->bind_interface.ifname);
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free(input_string_d);
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return -1;
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}
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static int parse_ipv6_with_scope(char *str, struct ipv6_with_scope *result) {
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char *percent_brk = strchr(str, '%');
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if (percent_brk) {
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@ -36,24 +226,6 @@ static int parse_ipv6_with_scope(char *str, struct ipv6_with_scope *result) {
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}
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return 0;
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}
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struct socket_enhancer_config {
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int (*real_bind)(int, const struct sockaddr *, socklen_t);
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int (*real_connect)(int, const struct sockaddr *, socklen_t);
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struct in_addr ipv4_default;
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struct in_addr ipv4_loopback;
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uint8_t universal_link_local_mode;
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uint8_t always_freebind;
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uint8_t has_v4_default:1;
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uint8_t has_v4_loopback:1;
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uint8_t has_v6_default:1;
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uint8_t has_v6_v4mapv6:1;
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uint8_t has_v6_linklocal:1;
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uint8_t has_v6_uniquelocal:1;
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struct ipv6_with_scope ipv6_default;
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struct ipv6_with_scope ipv6_v4mapv6;
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struct ipv6_with_scope ipv6_linklocal;
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struct ipv6_with_scope ipv6_uniquelocal;
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};
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static struct socket_enhancer_config *global_config = NULL;
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static void parse_v4(const char *addr, struct in_addr *result) {
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if (inet_pton(AF_INET, addr, result) != 1) {
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