McRequest umbrellaParseRequest(const folly::IOBuf& source, const uint8_t* header, size_t nheader, const uint8_t* body, size_t nbody, mc_op_t& opOut, uint64_t& reqidOut) { McRequest req; opOut = mc_op_unknown; reqidOut = 0; auto msg = reinterpret_cast<const entry_list_msg_t*>(header); size_t nentries = folly::Endian::big((uint16_t)msg->nentries); if (reinterpret_cast<const uint8_t*>(&msg->entries[nentries]) != header + nheader) { throw std::runtime_error("Invalid number of entries"); } for (size_t i = 0; i < nentries; ++i) { auto& entry = msg->entries[i]; size_t tag = folly::Endian::big((uint16_t)entry.tag); size_t val = folly::Endian::big((uint64_t)entry.data.val); switch (tag) { case msg_op: if (val >= UM_NOPS) { throw std::runtime_error("op out of range"); } opOut = static_cast<mc_op_t>(umbrella_op_to_mc[val]); break; case msg_reqid: if (val == 0) { throw std::runtime_error("invalid reqid"); } reqidOut = val; break; case msg_flags: req.setFlags(val); break; case msg_exptime: req.setExptime(val); break; case msg_delta: req.setDelta(val); break; case msg_cas: req.setCas(val); break; case msg_lease_id: req.setLeaseToken(val); break; case msg_key: if (!req.setKeyFrom( source, body + folly::Endian::big((uint32_t)entry.data.str.offset), folly::Endian::big((uint32_t)entry.data.str.len) - 1)) { throw std::runtime_error("Key: invalid offset/length"); } break; case msg_value: if (!req.setValueFrom( source, body + folly::Endian::big((uint32_t)entry.data.str.offset), folly::Endian::big((uint32_t)entry.data.str.len) - 1)) { throw std::runtime_error("Value: invalid offset/length"); } break; #ifndef LIBMC_FBTRACE_DISABLE case msg_fbtrace: { auto off = folly::Endian::big((uint32_t)entry.data.str.offset); auto len = folly::Endian::big((uint32_t)entry.data.str.len) - 1; if (len > FBTRACE_METADATA_SZ) { throw std::runtime_error("Fbtrace metadata too large"); } if (off + len > nbody || off + len < off) { throw std::runtime_error("Fbtrace metadata field invalid"); } auto fbtraceInfo = new_mc_fbtrace_info(0); memcpy(fbtraceInfo->metadata, body + off, len); req.setFbtraceInfo(fbtraceInfo); break; } #endif default: /* Ignore unknown tags silently */ break; } } if (opOut == mc_op_unknown) { throw std::runtime_error("Request missing operation"); } if (!reqidOut) { throw std::runtime_error("Request missing reqid"); } return req; }