There are 5 service flags in src/protocol.cpp:
static std::string serviceFlagToStr(size_t bit)
{ const uint64_t service_flag = 1ULL << bit; switch ((ServiceFlags)service_flag) { case NODE_NONE: abort(); // impossible case NODE_NETWORK: return "NETWORK"; case NODE_BLOOM: return "BLOOM"; case NODE_WITNESS: return "WITNESS"; case NODE_COMPACT_FILTERS: return "COMPACT_FILTERS"; case NODE_NETWORK_LIMITED: return "NETWORK_LIMITED"; // Not using default, so we get warned when a case is missing }/** nServices flags */
enum ServiceFlags : uint64_t { // NOTE: When adding here, be sure to update serviceFlagToStr too // Nothing NODE_NONE = 0, // NODE_NETWORK means that the node is capable of serving the complete block chain. It is currently // set by all Bitcoin Core non pruned nodes, and is unset by SPV clients or other light clients. NODE_NETWORK = (1 << 0), // NODE_BLOOM means the node is capable and willing to handle bloom-filtered connections. // Bitcoin Core nodes used to support this by default, without advertising this bit, // but no longer do as of protocol version 70011 (= NO_BLOOM_VERSION) NODE_BLOOM = (1 << 2), // NODE_WITNESS indicates that a node can be asked for blocks and transactions including // witness data. NODE_WITNESS = (1 << 3), // NODE_COMPACT_FILTERS means the node will service basic block filter requests. // See BIP157 and BIP158 for details on how this is implemented. NODE_COMPACT_FILTERS = (1 << 6), // NODE_NETWORK_LIMITED means the same as NODE_NETWORK with the limitation of only // serving the last 288 (2 day) blocks // See BIP159 for details on how this is implemented. NODE_NETWORK_LIMITED = (1 << 10),Do bitcoin core nodes verify if a peer is bluffing about a service flag? Example: If a peer has NODE_NETWORK flag set but its a pruned node
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