struct tlv_packet *sys_config_getenv(struct tlv_handler_ctx *ctx) { struct tlv_packet *p = tlv_packet_response_result(ctx, TLV_RESULT_SUCCESS); struct tlv_iterator i = { .packet = ctx->req, .value_type = TLV_TYPE_ENV_VARIABLE, }; char *env_var; while ((env_var = tlv_packet_iterate_str(&i))) { char *env_val = getenv(normalize_env_var(env_var)); if (env_val) { struct tlv_packet *env = tlv_packet_new(TLV_TYPE_ENV_GROUP, 0); env = tlv_packet_add_str(env, TLV_TYPE_ENV_VARIABLE, env_var); env = tlv_packet_add_str(env, TLV_TYPE_ENV_VALUE, env_val); p = tlv_packet_add_child(p, env); } } return p; } struct tlv_packet *sys_config_getuid(struct tlv_handler_ctx *ctx) { struct tlv_packet *p = tlv_packet_response_result(ctx, TLV_RESULT_SUCCESS); return tlv_packet_add_fmt(p, TLV_TYPE_USER_NAME, "uid=%d, gid=%d, euid=%d, egid=%d", getuid(), geteuid(), getgid(), getegid()); } struct tlv_packet *sys_config_sysinfo(struct tlv_handler_ctx *ctx) { struct mettle *m = ctx->arg; sigar_sys_info_t sys_info; if (sigar_sys_info_get(mettle_get_sigar(m), &sys_info) == -1) { return tlv_packet_response_result(ctx, errno); } struct tlv_packet *p = tlv_packet_response_result(ctx, TLV_RESULT_SUCCESS); p = tlv_packet_add_str(p, TLV_TYPE_COMPUTER_NAME, mettle_get_fqdn(m)); p = tlv_packet_add_fmt(p, TLV_TYPE_OS_NAME, "%s (%s %s)", sys_info.description, sys_info.name, sys_info.version); p = tlv_packet_add_str(p, TLV_TYPE_ARCHITECTURE, sys_info.arch); return p; }
static int lldp_build_tlv_packet(tlv_packet **ret) { _cleanup_(sd_lldp_packet_unrefp) tlv_packet *m = NULL; const uint8_t lldp_dst[] = LLDP_MULTICAST_ADDR; struct ether_header ether = { .ether_type = htons(ETHERTYPE_LLDP), }; /* Append Ethernet header */ memcpy(ðer.ether_dhost, lldp_dst, ETHER_ADDR_LEN); memcpy(ðer.ether_shost, &mac_addr, ETHER_ADDR_LEN); assert_se(tlv_packet_new(&m) >= 0); assert_se(tlv_packet_append_bytes(m, ðer, sizeof(struct ether_header)) >= 0); assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_CHASSIS_ID) >= 0); assert_se(tlv_packet_append_u8(m, LLDP_CHASSIS_SUBTYPE_MAC_ADDRESS) >= 0); assert_se(tlv_packet_append_bytes(m, &mac_addr, ETHER_ADDR_LEN) >= 0); assert_se(lldp_tlv_packet_close_container(m) >= 0); /* port name */ assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_PORT_ID) >= 0); assert_se(tlv_packet_append_u8(m, LLDP_PORT_SUBTYPE_INTERFACE_NAME) >= 0); assert_se(tlv_packet_append_bytes(m, TEST_LLDP_PORT, strlen(TEST_LLDP_PORT) + 1) >= 0); assert_se(lldp_tlv_packet_close_container(m) >= 0); /* ttl */ assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_TTL) >= 0); assert_se(tlv_packet_append_u16(m, 170) >= 0); assert_se(lldp_tlv_packet_close_container(m) >= 0); /* system name */ assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_SYSTEM_NAME) >= 0); assert_se(tlv_packet_append_bytes(m, TEST_LLDP_TYPE_SYSTEM_NAME, strlen(TEST_LLDP_TYPE_SYSTEM_NAME)) >= 0); assert_se(lldp_tlv_packet_close_container(m) >= 0); /* system descrition */ assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_SYSTEM_DESCRIPTION) >= 0); assert_se(tlv_packet_append_bytes(m, TEST_LLDP_TYPE_SYSTEM_DESC, strlen(TEST_LLDP_TYPE_SYSTEM_DESC)) >= 0); assert_se(lldp_tlv_packet_close_container(m) >= 0); /* Mark end of packet */ assert_se(lldp_tlv_packet_open_container(m, LLDP_TYPE_END) >= 0); assert_se(lldp_tlv_packet_close_container(m) >= 0); *ret = m; m = NULL; return 0; }
int lldp_network_bind_raw_socket(int ifindex) { typedef struct LLDPFrame { struct ethhdr hdr; uint8_t tlvs[0]; } LLDPFrame; struct sock_filter filter[] = { BPF_STMT(BPF_LD + BPF_W + BPF_ABS, offsetof(LLDPFrame, hdr.h_dest)), /* A <- 4 bytes of destination MAC */ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0180c200, 1, 0), /* A != 01:80:c2:00 */ BPF_STMT(BPF_RET + BPF_K, 0), /* drop packet */ BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(LLDPFrame, hdr.h_dest) + 4), /* A <- remaining 2 bytes of destination MAC */ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0000, 3, 0), /* A != 00:00 */ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x0003, 2, 0), /* A != 00:03 */ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, 0x000e, 1, 0), /* A != 00:0e */ BPF_STMT(BPF_RET + BPF_K, 0), /* drop packet */ BPF_STMT(BPF_LD + BPF_H + BPF_ABS, offsetof(LLDPFrame, hdr.h_proto)), /* A <- protocol */ BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ETHERTYPE_LLDP, 1, 0), /* A != ETHERTYPE_LLDP */ BPF_STMT(BPF_RET + BPF_K, 0), /* drop packet */ BPF_STMT(BPF_RET + BPF_K, (uint32_t) -1), /* accept packet */ }; struct sock_fprog fprog = { .len = ELEMENTSOF(filter), .filter = filter }; _cleanup_close_ int s = -1; union sockaddr_union saddrll = { .ll.sll_family = AF_PACKET, .ll.sll_ifindex = ifindex, }; int r; assert(ifindex > 0); s = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); if (s < 0) return -errno; r = setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER, &fprog, sizeof(fprog)); if (r < 0) return -errno; r = bind(s, &saddrll.sa, sizeof(saddrll.ll)); if (r < 0) return -errno; r = s; s = -1; return r; } int lldp_receive_packet(sd_event_source *s, int fd, uint32_t revents, void *userdata) { _cleanup_tlv_packet_free_ tlv_packet *packet = NULL; tlv_packet *p; uint16_t length; int r; assert(fd); assert(userdata); r = tlv_packet_new(&packet); if (r < 0) return r; length = read(fd, &packet->pdu, sizeof(packet->pdu)); /* Silently drop the packet */ if ((size_t) length > ETHER_MAX_LEN) return 0; packet->userdata = userdata; p = packet; packet = NULL; return lldp_handle_packet(p, (uint16_t) length); }