// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: connect.cc,v 1.10 2003/02/10 07:34:41 doogie Exp $ /* ###################################################################### Connect - Replacement connect call This was originally authored by Jason Gunthorpe <jgg@debian.org> and is placed in the Public Domain, do with it what you will. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <apti18n.h> #include "connect.h" #include <apt-pkg/error.h> #include <apt-pkg/fileutl.h> #include <stdio.h> #include <errno.h> #include <unistd.h> // Internet stuff #include <netinet/in.h> #include <sys/socket.h> #include <arpa/inet.h> #include <netdb.h> #include "rfc2553emu.h" /*}}}*/ static string LastHost; static int LastPort = 0; static struct addrinfo *LastHostAddr = 0; static struct addrinfo *LastUsed = 0; // RotateDNS - Select a new server from a DNS rotation /*{{{*/ // --------------------------------------------------------------------- /* This is called during certain errors in order to recover by selecting a new server */ void RotateDNS() { if (LastUsed != 0 && LastUsed->ai_next != 0) LastUsed = LastUsed->ai_next; else LastUsed = LastHostAddr; } /*}}}*/ // DoConnect - Attempt a connect operation /*{{{*/ // --------------------------------------------------------------------- /* This helper function attempts a connection to a single address. */ static bool DoConnect(struct addrinfo *Addr,string Host, unsigned long TimeOut,int &Fd,pkgAcqMethod *Owner) { // Show a status indicator char Name[NI_MAXHOST]; char Service[NI_MAXSERV]; Name[0] = 0; Service[0] = 0; getnameinfo(Addr->ai_addr,Addr->ai_addrlen, Name,sizeof(Name),Service,sizeof(Service), NI_NUMERICHOST|NI_NUMERICSERV); Owner->Status(_("Connecting to %s (%s)"),Host.c_str(),Name); /* If this is an IP rotation store the IP we are using.. If something goes wrong this will get tacked onto the end of the error message */ if (LastHostAddr->ai_next != 0) { char Name2[NI_MAXHOST + NI_MAXSERV + 10]; snprintf(Name2,sizeof(Name2),_("[IP: %s %s]"),Name,Service); Owner->SetFailExtraMsg(string(Name2)); } else Owner->SetFailExtraMsg(""); // Get a socket if ((Fd = socket(Addr->ai_family,Addr->ai_socktype, Addr->ai_protocol)) < 0) return _error->Errno("socket",_("Could not create a socket for %s (f=%u t=%u p=%u)"), Name,Addr->ai_family,Addr->ai_socktype,Addr->ai_protocol); SetNonBlock(Fd,true); if (connect(Fd,Addr->ai_addr,Addr->ai_addrlen) < 0 && errno != EINPROGRESS) return _error->Errno("connect",_("Cannot initiate the connection " "to %s:%s (%s)."),Host.c_str(),Service,Name); /* This implements a timeout for connect by opening the connection nonblocking */ if (WaitFd(Fd,true,TimeOut) == false) return _error->Error(_("Could not connect to %s:%s (%s), " "connection timed out"),Host.c_str(),Service,Name); // Check the socket for an error condition unsigned int Err; unsigned int Len = sizeof(Err); if (getsockopt(Fd,SOL_SOCKET,SO_ERROR,&Err,&Len) != 0) return _error->Errno("getsockopt",_("Failed")); if (Err != 0) { errno = Err; return _error->Errno("connect",_("Could not connect to %s:%s (%s)."),Host.c_str(), Service,Name); } return true; } /*}}}*/ // Connect - Connect to a server /*{{{*/ // --------------------------------------------------------------------- /* Performs a connection to the server */ bool Connect(string Host,int Port,const char *Service,int DefPort,int &Fd, unsigned long TimeOut,pkgAcqMethod *Owner) { if (_error->PendingError() == true) return false; // Convert the port name/number char ServStr[300]; if (Port != 0) snprintf(ServStr,sizeof(ServStr),"%u",Port); else snprintf(ServStr,sizeof(ServStr),"%s",Service); /* We used a cached address record.. Yes this is against the spec but the way we have setup our rotating dns suggests that this is more sensible */ if (LastHost != Host || LastPort != Port) { Owner->Status(_("Connecting to %s"),Host.c_str()); // Free the old address structure if (LastHostAddr != 0) { freeaddrinfo(LastHostAddr); LastHostAddr = 0; LastUsed = 0; } // We only understand SOCK_STREAM sockets. struct addrinfo Hints; memset(&Hints,0,sizeof(Hints)); Hints.ai_socktype = SOCK_STREAM; Hints.ai_protocol = 0; // Resolve both the host and service simultaneously while (1) { int Res; if ((Res = getaddrinfo(Host.c_str(),ServStr,&Hints,&LastHostAddr)) != 0 || LastHostAddr == 0) { if (Res == EAI_NONAME || Res == EAI_SERVICE) { if (DefPort != 0) { snprintf(ServStr,sizeof(ServStr),"%u",DefPort); DefPort = 0; continue; } return _error->Error(_("Could not resolve '%s'"),Host.c_str()); } if (Res == EAI_AGAIN) return _error->Error(_("Temporary failure resolving '%s'"), Host.c_str()); return _error->Error(_("Something wicked happened resolving '%s:%s' (%i)"), Host.c_str(),ServStr,Res); } break; } LastHost = Host; LastPort = Port; } // When we have an IP rotation stay with the last IP. struct addrinfo *CurHost = LastHostAddr; if (LastUsed != 0) CurHost = LastUsed; while (CurHost != 0) { if (DoConnect(CurHost,Host,TimeOut,Fd,Owner) == true) { LastUsed = CurHost; return true; } close(Fd); Fd = -1; // Ignore UNIX domain sockets do { CurHost = CurHost->ai_next; } while (CurHost != 0 && CurHost->ai_family == AF_UNIX); /* If we reached the end of the search list then wrap around to the start */ if (CurHost == 0 && LastUsed != 0) CurHost = LastHostAddr; // Reached the end of the search cycle if (CurHost == LastUsed) break; if (CurHost != 0) _error->Discard(); } if (_error->PendingError() == true) return false; return _error->Error(_("Unable to connect to %s %s:"),Host.c_str(),ServStr); } /*}}}*/