support SO_BINDTODEVICE and bind client_host

src/brpc/channel.cpp

@@ -77,6 +77,7 @@ ChannelSSLOptions* ChannelOptions::mutable_ssl_options() {
 static ChannelSignature ComputeChannelSignature(const ChannelOptions& opt) {
     if (opt.auth == NULL &&
         !opt.has_ssl_options() &&
+        opt.client_host.empty() &&
         opt.connection_group.empty() &&
         opt.hc_option.health_check_path.empty()) {
         // Returning zeroized result by default is more intuitive for users.
@@ -94,6 +95,10 @@ static ChannelSignature ComputeChannelSignature(const ChannelOptions& opt) {
             buf.append("|conng=");
             buf.append(opt.connection_group);
         }
+        if (!opt.client_host.empty()) {
+            buf.append("|clih=");
+            buf.append(opt.client_host);
+        }
         if (opt.auth) {
             buf.append("|auth=");
             buf.append((char*)&opt.auth, sizeof(opt.auth));
@@ -362,14 +367,22 @@ int Channel::InitSingle(const butil::EndPoint& server_addr_and_port,
         LOG(ERROR) << "Invalid port=" << port;
         return -1;
     }
+    butil::EndPoint client_end_point;
+    if (!_options.client_host.empty() &&
+        butil::str2ip(_options.client_host.c_str(), &client_end_point.ip) != 0 &&
+        butil::hostname2ip(_options.client_host.c_str(), &client_end_point.ip) != 0) {
+        LOG(ERROR) << "Invalid client host=`" << _options.client_host << '\'';
+        return -1;
+    }
     _server_address = server_addr_and_port;
     const ChannelSignature sig = ComputeChannelSignature(_options);
     std::shared_ptr<SocketSSLContext> ssl_ctx;
     if (CreateSocketSSLContext(_options, &ssl_ctx) != 0) {
         return -1;
     }
     if (SocketMapInsert(SocketMapKey(server_addr_and_port, sig),
-                        &_server_id, ssl_ctx, _options.use_rdma, _options.hc_option) != 0) {
+                        &_server_id, ssl_ctx, _options.use_rdma,
+                        _options.hc_option, client_end_point) != 0) {
         LOG(ERROR) << "Fail to insert into SocketMap";
         return -1;
     }
@@ -397,6 +410,13 @@ int Channel::Init(const char* ns_url,
             _options.mutable_ssl_options()->sni_name = _service_name;
         }
     }
+    butil::EndPoint client_end_point;
+    if (!_options.client_host.empty() &&
+        butil::str2ip(_options.client_host.c_str(), &client_end_point.ip) != 0 &&
+        butil::hostname2ip(_options.client_host.c_str(), &client_end_point.ip) != 0) {
+        LOG(ERROR) << "Invalid client host=`" << _options.client_host << '\'';
+        return -1;
+    }
     std::unique_ptr<LoadBalancerWithNaming> lb(new (std::nothrow)
                                                    LoadBalancerWithNaming);
     if (NULL == lb) {
@@ -409,6 +429,7 @@ int Channel::Init(const char* ns_url,
     ns_opt.use_rdma = _options.use_rdma;
     ns_opt.channel_signature = ComputeChannelSignature(_options);
     ns_opt.hc_option =  _options.hc_option;
+    ns_opt.client_end_point = client_end_point;
     if (CreateSocketSSLContext(_options, &ns_opt.ssl_ctx) != 0) {
         return -1;
     }

src/brpc/channel.h

@@ -148,6 +148,10 @@ struct ChannelOptions {
     // Its priority is higher than FLAGS_health_check_path and FLAGS_health_check_timeout_ms.
     // When it is not set, FLAGS_health_check_path and FLAGS_health_check_timeout_ms will take effect.
     HealthCheckOption hc_option;
+
+    // IP address or host name of the client
+    // Default: ""
+    std::string client_host;
 private:
     // SSLOptions is large and not often used, allocate it on heap to
     // prevent ChannelOptions from being bloated in most cases.

src/brpc/details/naming_service_thread.cpp

@@ -126,7 +126,8 @@ void NamingServiceThread::Actions::ResetServers(
         //       to pick those Sockets with the right settings during OnAddedServers
         const SocketMapKey key(_added[i], _owner->_options.channel_signature);
         CHECK_EQ(0, SocketMapInsert(key, &tagged_id.id, _owner->_options.ssl_ctx,
-                                    _owner->_options.use_rdma, _owner->_options.hc_option));
+                                    _owner->_options.use_rdma, _owner->_options.hc_option,
+                                    _owner->_options.client_end_point));
         _added_sockets.push_back(tagged_id);
     }
 

src/brpc/details/naming_service_thread.h

@@ -53,6 +53,7 @@ struct GetNamingServiceThreadOptions {
     HealthCheckOption hc_option;
     ChannelSignature channel_signature;
     std::shared_ptr<SocketSSLContext> ssl_ctx;
+    butil::EndPoint client_end_point;
 };
 
 // A dedicated thread to map a name to ServerIds

src/brpc/socket.cpp

@@ -728,7 +728,7 @@ int Socket::OnCreated(const SocketOptions& options) {
     _keytable_pool = options.keytable_pool;
     _tos = 0;
     _remote_side = options.remote_side;
-    _local_side = butil::EndPoint();
+    _local_side = options.local_side;
     _on_edge_triggered_events = options.on_edge_triggered_events;
     _user = options.user;
     _conn = options.conn;
@@ -1283,8 +1283,10 @@ int Socket::Connect(const timespec* abstime,
         _ssl_state = SSL_OFF;
     }
     struct sockaddr_storage serv_addr;
+    struct sockaddr_storage cli_addr;
     socklen_t addr_size = 0;
-    if (butil::endpoint2sockaddr(remote_side(), &serv_addr, &addr_size) != 0) {
+    if (butil::endpoint2sockaddr(remote_side(), &serv_addr, &addr_size) != 0 ||
+        butil::endpoint2sockaddr(local_side(), &cli_addr, &addr_size) != 0) {
         PLOG(ERROR) << "Fail to get sockaddr";
         return -1;
     }
@@ -1297,6 +1299,10 @@ int Socket::Connect(const timespec* abstime,
     // We need to do async connect (to manage the timeout by ourselves).
     CHECK_EQ(0, butil::make_non_blocking(sockfd));
 
+    if (::bind(sockfd, (struct sockaddr*)& cli_addr, addr_size) != 0) {
+        LOG(FATAL) << "Fail to bind socket, errno=" << strerror(errno);
+        return -1;
+    }
     const int rc = ::connect(
         sockfd, (struct sockaddr*)&serv_addr, addr_size);
     if (rc != 0 && errno != EINPROGRESS) {
@@ -2811,6 +2817,7 @@ int Socket::GetPooledSocket(SocketUniquePtr* pooled_socket) {
     if (socket_pool == NULL) {
         SocketOptions opt;
         opt.remote_side = remote_side();
+        opt.local_side = local_side();
         opt.user = user();
         opt.on_edge_triggered_events = _on_edge_triggered_events;
         opt.initial_ssl_ctx = _ssl_ctx;

src/brpc/socket.h

@@ -250,6 +250,7 @@ struct SocketOptions {
     // user->BeforeRecycle() before recycling.
     int fd{-1};
     butil::EndPoint remote_side;
+    butil::EndPoint local_side;
     // If `connect_on_create' is true and `fd' is less than 0,
     // a client connection will be established to remote_side()
     // regarding deadline `connect_abstime' when Socket is being created.

src/brpc/socket_map.cpp

@@ -92,8 +92,9 @@ SocketMap* get_or_new_client_side_socket_map() {
 int SocketMapInsert(const SocketMapKey& key, SocketId* id,
                     const std::shared_ptr<SocketSSLContext>& ssl_ctx,
                     bool use_rdma,
-                    const HealthCheckOption& hc_option) {
-    return get_or_new_client_side_socket_map()->Insert(key, id, ssl_ctx, use_rdma, hc_option);
+                    const HealthCheckOption& hc_option,
+                    butil::EndPoint& client_end_point) {
+    return get_or_new_client_side_socket_map()->Insert(key, id, ssl_ctx, use_rdma, hc_option, client_end_point);
 }    
 
 int SocketMapFind(const SocketMapKey& key, SocketId* id) {
@@ -229,7 +230,8 @@ void SocketMap::ShowSocketMapInBvarIfNeed() {
 int SocketMap::Insert(const SocketMapKey& key, SocketId* id,
                       const std::shared_ptr<SocketSSLContext>& ssl_ctx,
                       bool use_rdma,
-                      const HealthCheckOption& hc_option) {
+                      const HealthCheckOption& hc_option,
+                      butil::EndPoint& client_end_point) {
     ShowSocketMapInBvarIfNeed();
 
     std::unique_lock<butil::Mutex> mu(_mutex);
@@ -251,6 +253,7 @@ int SocketMap::Insert(const SocketMapKey& key, SocketId* id,
     SocketId tmp_id;
     SocketOptions opt;
     opt.remote_side = key.peer.addr;
+    opt.local_side = client_end_point;
     opt.initial_ssl_ctx = ssl_ctx;
     opt.use_rdma = use_rdma;
     opt.hc_option = hc_option;

src/brpc/socket_map.h

@@ -82,18 +82,21 @@ struct SocketMapKeyHasher {
 int SocketMapInsert(const SocketMapKey& key, SocketId* id,
                     const std::shared_ptr<SocketSSLContext>& ssl_ctx,
                     bool use_rdma,
-                    const HealthCheckOption& hc_option);
+                    const HealthCheckOption& hc_option,
+                    butil::EndPoint& client_end_point);
 
 inline int SocketMapInsert(const SocketMapKey& key, SocketId* id,
                     const std::shared_ptr<SocketSSLContext>& ssl_ctx) {
     HealthCheckOption hc_option;
-    return SocketMapInsert(key, id, ssl_ctx, false, hc_option);
+    butil::EndPoint endpoint;
+    return SocketMapInsert(key, id, ssl_ctx, false, hc_option, endpoint);
 }
 
 inline int SocketMapInsert(const SocketMapKey& key, SocketId* id) {
     std::shared_ptr<SocketSSLContext> empty_ptr;
     HealthCheckOption hc_option;
-    return SocketMapInsert(key, id, empty_ptr, false, hc_option);
+    butil::EndPoint endpoint;
+    return SocketMapInsert(key, id, empty_ptr, false, hc_option, endpoint);
 }
 
 // Find the SocketId associated with `key'.
@@ -155,17 +158,20 @@ class SocketMap {
     int Insert(const SocketMapKey& key, SocketId* id,
                const std::shared_ptr<SocketSSLContext>& ssl_ctx,
                bool use_rdma,
-               const HealthCheckOption& hc_option);
+               const HealthCheckOption& hc_option,
+               butil::EndPoint& client_end_point);
 
     int Insert(const SocketMapKey& key, SocketId* id,
                const std::shared_ptr<SocketSSLContext>& ssl_ctx) {
         HealthCheckOption hc_option;
-        return Insert(key, id, ssl_ctx, false, hc_option);   
+        butil::EndPoint endpoint;
+        return Insert(key, id, ssl_ctx, false, hc_option, endpoint);   
     }
     int Insert(const SocketMapKey& key, SocketId* id) {
         std::shared_ptr<SocketSSLContext> empty_ptr;
         HealthCheckOption hc_option;
-        return Insert(key, id, empty_ptr, false, hc_option);
+        butil::EndPoint endpoint;
+        return Insert(key, id, empty_ptr, false, hc_option, endpoint);
     }
 
     void Remove(const SocketMapKey& key, SocketId expected_id);