xref: /recipes/reactor/s05-s04-SocketsOps.cc.diff

 // Copyright 2010, Shuo Chen.  All rights reserved.
 // http://code.google.com/p/muduo/
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the License file.
 
 // Author: Shuo Chen (chenshuo at chenshuo dot com)
 
 #include "SocketsOps.h"
 #include "logging/Logging.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>  // snprintf
 #include <strings.h>  // bzero
 #include <sys/socket.h>
 #include <unistd.h>
 
 using namespace muduo;
 
 namespace
 {
 
 typedef struct sockaddr SA;
 
 const SA* sockaddr_cast(const struct sockaddr_in* addr)
 {
   return static_cast<const SA*>(implicit_cast<const void*>(addr));
 }
 
 SA* sockaddr_cast(struct sockaddr_in* addr)
 {
   return static_cast<SA*>(implicit_cast<void*>(addr));
 }
 
 void setNonBlockAndCloseOnExec(int sockfd)
 {
   // non-block
   int flags = ::fcntl(sockfd, F_GETFL, 0);
   flags |= O_NONBLOCK;
   int ret = ::fcntl(sockfd, F_SETFL, flags);
   // FIXME check
 
   // close-on-exec
   flags = ::fcntl(sockfd, F_GETFD, 0);
   flags |= FD_CLOEXEC;
   ret = ::fcntl(sockfd, F_SETFD, flags);
   // FIXME check
 }
 
 }
 
 int sockets::createNonblockingOrDie()
 {
   // socket
 #if VALGRIND
   int sockfd = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
   if (sockfd < 0)
   {
     LOG_SYSFATAL << "sockets::createNonblockingOrDie";
   }
 
   setNonBlockAndCloseOnExec(sockfd);
 #else
   int sockfd = ::socket(AF_INET,
                         SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
                         IPPROTO_TCP);
   if (sockfd < 0)
   {
     LOG_SYSFATAL << "sockets::createNonblockingOrDie";
   }
 #endif
   return sockfd;
 }
 
 void sockets::bindOrDie(int sockfd, const struct sockaddr_in& addr)
 {
   int ret = ::bind(sockfd, sockaddr_cast(&addr), sizeof addr);
   if (ret < 0)
   {
     LOG_SYSFATAL << "sockets::bindOrDie";
   }
 }
 
 void sockets::listenOrDie(int sockfd)
 {
   int ret = ::listen(sockfd, SOMAXCONN);
   if (ret < 0)
   {
     LOG_SYSFATAL << "sockets::listenOrDie";
   }
 }
 
 int sockets::accept(int sockfd, struct sockaddr_in* addr)
 {
   socklen_t addrlen = sizeof *addr;
 #if VALGRIND
   int connfd = ::accept(sockfd, sockaddr_cast(addr), &addrlen);
   setNonBlockAndCloseOnExec(connfd);
 #else
   int connfd = ::accept4(sockfd, sockaddr_cast(addr),
                          &addrlen, SOCK_NONBLOCK | SOCK_CLOEXEC);
 #endif
   if (connfd < 0)
   {
     int savedErrno = errno;
     LOG_SYSERR << "Socket::accept";
     switch (savedErrno)
     {
       case EAGAIN:
       case ECONNABORTED:
       case EINTR:
       case EPROTO: // ???
       case EPERM:
       case EMFILE: // per-process lmit of open file desctiptor ???
         // expected errors
         errno = savedErrno;
         break;
       case EBADF:
       case EFAULT:
       case EINVAL:
       case ENFILE:
       case ENOBUFS:
       case ENOMEM:
       case ENOTSOCK:
       case EOPNOTSUPP:
         // unexpected errors
         LOG_FATAL << "unexpected error of ::accept " << savedErrno;
         break;
       default:
         LOG_FATAL << "unknown error of ::accept " << savedErrno;
         break;
     }
   }
   return connfd;
 }
 
 void sockets::close(int sockfd)
 {
   if (::close(sockfd) < 0)
   {
     LOG_SYSERR << "sockets::close";
   }
 }
 
 void sockets::toHostPort(char* buf, size_t size,
                          const struct sockaddr_in& addr)
 {
   char host[INET_ADDRSTRLEN] = "INVALID";
   ::inet_ntop(AF_INET, &addr.sin_addr, host, sizeof host);
   uint16_t port = sockets::networkToHost16(addr.sin_port);
   snprintf(buf, size, "%s:%u", host, port);
 }
 
 void sockets::fromHostPort(const char* ip, uint16_t port,
                            struct sockaddr_in* addr)
 {
   addr->sin_family = AF_INET;
   addr->sin_port = hostToNetwork16(port);
   if (::inet_pton(AF_INET, ip, &addr->sin_addr) <= 0)
   {
     LOG_SYSERR << "sockets::fromHostPort";
   }
 }
 
+struct sockaddr_in sockets::getLocalAddr(int sockfd)
+{
+  struct sockaddr_in localaddr;
+  bzero(&localaddr, sizeof localaddr);
+  socklen_t addrlen = sizeof(localaddr);
+  if (::getsockname(sockfd, sockaddr_cast(&localaddr), &addrlen) < 0)
+  {
+    LOG_SYSERR << "sockets::getLocalAddr";
+  }
+  return localaddr;
+}
+