// $Id: http.cc,v 1.59 2004/05/08 19:42:35 mdz Exp $
/* ######################################################################
- HTTP Aquire Method - This is the HTTP aquire method for APT.
+ HTTP Acquire Method - This is the HTTP aquire method for APT.
It uses HTTP/1.1 and many of the fancy options there-in, such as
pipelining, range, if-range and so on.
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/error.h>
#include <apt-pkg/hashes.h>
+#include <apt-pkg/netrc.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <errno.h>
#include <string.h>
#include <iostream>
+#include <map>
#include <apti18n.h>
+
// Internet stuff
#include <netdb.h>
+#include "config.h"
#include "connect.h"
#include "rfc2553emu.h"
#include "http.h"
-
/*}}}*/
using namespace std;
time_t HttpMethod::FailTime = 0;
unsigned long PipelineDepth = 10;
unsigned long TimeOut = 120;
+bool AllowRedirect = false;
bool Debug = false;
-
+URI Proxy;
unsigned long CircleBuf::BwReadLimit=0;
unsigned long CircleBuf::BwTickReadData=0;
struct timeval CircleBuf::BwReadTick={0,0};
const unsigned int CircleBuf::BW_HZ=10;
-
+
// CircleBuf::CircleBuf - Circular input buffer /*{{{*/
// ---------------------------------------------------------------------
/* */
Persistent = true;
// Determine the proxy setting
- if (getenv("http_proxy") == 0)
+ string SpecificProxy = _config->Find("Acquire::http::Proxy::" + ServerName.Host);
+ if (!SpecificProxy.empty())
{
- string DefProxy = _config->Find("Acquire::http::Proxy");
- string SpecificProxy = _config->Find("Acquire::http::Proxy::" + ServerName.Host);
- if (SpecificProxy.empty() == false)
- {
- if (SpecificProxy == "DIRECT")
- Proxy = "";
- else
- Proxy = SpecificProxy;
- }
- else
- Proxy = DefProxy;
+ if (SpecificProxy == "DIRECT")
+ Proxy = "";
+ else
+ Proxy = SpecificProxy;
}
else
- Proxy = getenv("http_proxy");
+ {
+ string DefProxy = _config->Find("Acquire::http::Proxy");
+ if (!DefProxy.empty())
+ {
+ Proxy = DefProxy;
+ }
+ else
+ {
+ char* result = getenv("http_proxy");
+ Proxy = result ? result : "";
+ }
+ }
// Parse no_proxy, a , separated list of domains
if (getenv("no_proxy") != 0)
/*}}}*/
// ServerState::RunHeaders - Get the headers before the data /*{{{*/
// ---------------------------------------------------------------------
-/* Returns 0 if things are OK, 1 if an IO error occursed and 2 if a header
- parse error occured */
-int ServerState::RunHeaders()
+/* Returns 0 if things are OK, 1 if an IO error occurred and 2 if a header
+ parse error occurred */
+ServerState::RunHeadersResult ServerState::RunHeaders()
{
State = Header;
string::const_iterator J = I;
for (; J != Data.end() && *J != '\n' && *J != '\r';J++);
if (HeaderLine(string(I,J)) == false)
- return 2;
+ return RUN_HEADERS_PARSE_ERROR;
I = J;
}
if (Encoding == Closes && HaveContent == true)
Persistent = false;
- return 0;
+ return RUN_HEADERS_OK;
}
while (Owner->Go(false,this) == true);
- return 1;
+ return RUN_HEADERS_IO_ERROR;
}
/*}}}*/
// ServerState::RunData - Transfer the data from the socket /*{{{*/
// Evil servers return no version
if (Line[4] == '/')
{
- if (sscanf(Line.c_str(),"HTTP/%u.%u %u %[^\n]",&Major,&Minor,
+ if (sscanf(Line.c_str(),"HTTP/%u.%u %u%[^\n]",&Major,&Minor,
&Result,Code) != 4)
return _error->Error(_("The HTTP server sent an invalid reply header"));
}
{
Major = 0;
Minor = 9;
- if (sscanf(Line.c_str(),"HTTP %u %[^\n]",&Result,Code) != 2)
+ if (sscanf(Line.c_str(),"HTTP %u%[^\n]",&Result,Code) != 2)
return _error->Error(_("The HTTP server sent an invalid reply header"));
}
return true;
}
+ if (stringcasecmp(Tag,"Location:") == 0)
+ {
+ Location = Val;
+ return true;
+ }
+
return true;
}
/*}}}*/
and a no-store directive for archives. */
sprintf(Buf,"GET %s HTTP/1.1\r\nHost: %s\r\n",
Itm->Uri.c_str(),ProperHost.c_str());
- // only generate a cache control header if we actually want to
- // use a cache
- if (_config->FindB("Acquire::http::No-Cache",false) == false)
+ }
+ // generate a cache control header (if needed)
+ if (_config->FindB("Acquire::http::No-Cache",false) == true)
+ {
+ strcat(Buf,"Cache-Control: no-cache\r\nPragma: no-cache\r\n");
+ }
+ else
+ {
+ if (Itm->IndexFile == true)
{
- if (Itm->IndexFile == true)
- sprintf(Buf+strlen(Buf),"Cache-Control: max-age=%u\r\n",
- _config->FindI("Acquire::http::Max-Age",0));
- else
- {
- if (_config->FindB("Acquire::http::No-Store",false) == true)
- strcat(Buf,"Cache-Control: no-store\r\n");
- }
+ sprintf(Buf+strlen(Buf),"Cache-Control: max-age=%u\r\n",
+ _config->FindI("Acquire::http::Max-Age",0));
+ }
+ else
+ {
+ if (_config->FindB("Acquire::http::No-Store",false) == true)
+ strcat(Buf,"Cache-Control: no-store\r\n");
}
}
- // generate a no-cache header if needed
- if (_config->FindB("Acquire::http::No-Cache",false) == true)
- strcat(Buf,"Cache-Control: no-cache\r\nPragma: no-cache\r\n");
string Req = Buf;
Req += string("Proxy-Authorization: Basic ") +
Base64Encode(Proxy.User + ":" + Proxy.Password) + "\r\n";
+ maybe_add_auth (Uri, _config->FindFile("Dir::Etc::netrc"));
if (Uri.User.empty() == false || Uri.Password.empty() == false)
+ {
Req += string("Authorization: Basic ") +
Base64Encode(Uri.User + ":" + Uri.Password) + "\r\n";
-
- Req += "User-Agent: Ubuntu APT-HTTP/1.3\r\n\r\n";
+ }
+ Req += "User-Agent: " + _config->Find("Acquire::http::User-Agent",
+ "Debian APT-HTTP/1.3 ("VERSION")") + "\r\n\r\n";
if (Debug == true)
cerr << Req << endl;
1 - IMS hit
3 - Unrecoverable error
4 - Error with error content page
- 5 - Unrecoverable non-server error (close the connection) */
-int HttpMethod::DealWithHeaders(FetchResult &Res,ServerState *Srv)
+ 5 - Unrecoverable non-server error (close the connection)
+ 6 - Try again with a new or changed URI
+ */
+HttpMethod::DealWithHeadersResult
+HttpMethod::DealWithHeaders(FetchResult &Res,ServerState *Srv)
{
// Not Modified
if (Srv->Result == 304)
unlink(Queue->DestFile.c_str());
Res.IMSHit = true;
Res.LastModified = Queue->LastModified;
- return 1;
+ return IMS_HIT;
}
+ /* Redirect
+ *
+ * Note that it is only OK for us to treat all redirection the same
+ * because we *always* use GET, not other HTTP methods. There are
+ * three redirection codes for which it is not appropriate that we
+ * redirect. Pass on those codes so the error handling kicks in.
+ */
+ if (AllowRedirect
+ && (Srv->Result > 300 && Srv->Result < 400)
+ && (Srv->Result != 300 // Multiple Choices
+ && Srv->Result != 304 // Not Modified
+ && Srv->Result != 306)) // (Not part of HTTP/1.1, reserved)
+ {
+ if (!Srv->Location.empty())
+ {
+ NextURI = Srv->Location;
+ return TRY_AGAIN_OR_REDIRECT;
+ }
+ /* else pass through for error message */
+ }
+
/* We have a reply we dont handle. This should indicate a perm server
failure */
if (Srv->Result < 200 || Srv->Result >= 300)
{
_error->Error("%u %s",Srv->Result,Srv->Code);
if (Srv->HaveContent == true)
- return 4;
- return 3;
+ return ERROR_WITH_CONTENT_PAGE;
+ return ERROR_UNRECOVERABLE;
}
// This is some sort of 2xx 'data follows' reply
delete File;
File = new FileFd(Queue->DestFile,FileFd::WriteAny);
if (_error->PendingError() == true)
- return 5;
+ return ERROR_NOT_FROM_SERVER;
FailFile = Queue->DestFile;
FailFile.c_str(); // Make sure we dont do a malloc in the signal handler
if (Srv->StartPos >= 0)
{
Res.ResumePoint = Srv->StartPos;
- ftruncate(File->Fd(),Srv->StartPos);
+ if (ftruncate(File->Fd(),Srv->StartPos) < 0)
+ _error->Errno("ftruncate", _("Failed to truncate file"));
}
// Set the start point
if (Srv->In.Hash->AddFD(File->Fd(),Srv->StartPos) == false)
{
_error->Errno("read",_("Problem hashing file"));
- return 5;
+ return ERROR_NOT_FROM_SERVER;
}
lseek(File->Fd(),0,SEEK_END);
}
SetNonBlock(File->Fd(),true);
- return 0;
+ return FILE_IS_OPEN;
}
/*}}}*/
// HttpMethod::SigTerm - Handle a fatal signal /*{{{*/
// Queue the requests
int Depth = -1;
- bool Tail = false;
for (FetchItem *I = Queue; I != 0 && Depth < (signed)PipelineDepth;
I = I->Next, Depth++)
{
if (Server->Comp(I->Uri) == false)
break;
if (QueueBack == I)
- Tail = true;
- if (Tail == true)
{
QueueBack = I->Next;
SendReq(I,Server->Out);
if (pkgAcqMethod::Configuration(Message) == false)
return false;
+ AllowRedirect = _config->FindB("Acquire::http::AllowRedirect",true);
TimeOut = _config->FindI("Acquire::http::Timeout",TimeOut);
PipelineDepth = _config->FindI("Acquire::http::Pipeline-Depth",
PipelineDepth);
Debug = _config->FindB("Debug::Acquire::http",false);
-
+ AutoDetectProxyCmd = _config->Find("Acquire::http::ProxyAutoDetect");
+
+ // Get the proxy to use
+ AutoDetectProxy();
+
return true;
}
/*}}}*/
/* */
int HttpMethod::Loop()
{
+ typedef vector<string> StringVector;
+ typedef vector<string>::iterator StringVectorIterator;
+ map<string, StringVector> Redirected;
+
signal(SIGTERM,SigTerm);
signal(SIGINT,SigTerm);
delete Server;
Server = new ServerState(Queue->Uri,this);
}
-
/* If the server has explicitly said this is the last connection
then we pre-emptively shut down the pipeline and tear down
the connection. This will speed up HTTP/1.0 servers a tad
// Fetch the next URL header data from the server.
switch (Server->RunHeaders())
{
- case 0:
+ case ServerState::RUN_HEADERS_OK:
break;
// The header data is bad
- case 2:
+ case ServerState::RUN_HEADERS_PARSE_ERROR:
{
_error->Error(_("Bad header data"));
Fail(true);
// The server closed a connection during the header get..
default:
- case 1:
+ case ServerState::RUN_HEADERS_IO_ERROR:
{
FailCounter++;
_error->Discard();
switch (DealWithHeaders(Res,Server))
{
// Ok, the file is Open
- case 0:
+ case FILE_IS_OPEN:
{
URIStart(Res);
URIDone(Res);
}
else
- Fail(true);
-
+ {
+ if (Server->ServerFd == -1)
+ {
+ FailCounter++;
+ _error->Discard();
+ Server->Close();
+
+ if (FailCounter >= 2)
+ {
+ Fail(_("Connection failed"),true);
+ FailCounter = 0;
+ }
+
+ QueueBack = Queue;
+ }
+ else
+ Fail(true);
+ }
break;
}
// IMS hit
- case 1:
+ case IMS_HIT:
{
URIDone(Res);
break;
}
// Hard server error, not found or something
- case 3:
+ case ERROR_UNRECOVERABLE:
{
Fail();
break;
}
// Hard internal error, kill the connection and fail
- case 5:
+ case ERROR_NOT_FROM_SERVER:
{
delete File;
File = 0;
}
// We need to flush the data, the header is like a 404 w/ error text
- case 4:
+ case ERROR_WITH_CONTENT_PAGE:
{
Fail();
break;
}
+ // Try again with a new URL
+ case TRY_AGAIN_OR_REDIRECT:
+ {
+ // Clear rest of response if there is content
+ if (Server->HaveContent)
+ {
+ File = new FileFd("/dev/null",FileFd::WriteExists);
+ Server->RunData();
+ delete File;
+ File = 0;
+ }
+
+ /* Detect redirect loops. No more redirects are allowed
+ after the same URI is seen twice in a queue item. */
+ StringVector &R = Redirected[Queue->DestFile];
+ bool StopRedirects = false;
+ if (R.size() == 0)
+ R.push_back(Queue->Uri);
+ else if (R[0] == "STOP" || R.size() > 10)
+ StopRedirects = true;
+ else
+ {
+ for (StringVectorIterator I = R.begin(); I != R.end(); I++)
+ if (Queue->Uri == *I)
+ {
+ R[0] = "STOP";
+ break;
+ }
+
+ R.push_back(Queue->Uri);
+ }
+
+ if (StopRedirects == false)
+ Redirect(NextURI);
+ else
+ Fail();
+
+ break;
+ }
+
default:
Fail(_("Internal error"));
break;
return 0;
}
/*}}}*/
+// HttpMethod::AutoDetectProxy - auto detect proxy /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool HttpMethod::AutoDetectProxy()
+{
+ if (AutoDetectProxyCmd.empty())
+ return true;
+
+ if (Debug)
+ clog << "Using auto proxy detect command: " << AutoDetectProxyCmd << endl;
+
+ int Pipes[2] = {-1,-1};
+ if (pipe(Pipes) != 0)
+ return _error->Errno("pipe", "Failed to create Pipe");
+
+ pid_t Process = ExecFork();
+ if (Process == 0)
+ {
+ dup2(Pipes[1],STDOUT_FILENO);
+ SetCloseExec(STDOUT_FILENO,false);
+
+ const char *Args[2];
+ Args[0] = AutoDetectProxyCmd.c_str();
+ Args[1] = 0;
+ execv(Args[0],(char **)Args);
+ cerr << "Failed to exec method " << Args[0] << endl;
+ _exit(100);
+ }
+ char buf[512];
+ int InFd = Pipes[0];
+ if (read(InFd, buf, sizeof(buf)) < 0)
+ return _error->Errno("read", "Failed to read");
+ ExecWait(Process, "ProxyAutoDetect");
+
+ if (Debug)
+ clog << "auto detect command returned: '" << buf << "'" << endl;
+
+ if (strstr(buf, "http://") == buf)
+ _config->Set("Acquire::http::proxy", _strstrip(buf));
+
+ return true;
+}
+ /*}}}*/
int main()
{
setlocale(LC_ALL, "");
+ // ignore SIGPIPE, this can happen on write() if the socket
+ // closes the connection (this is dealt with via ServerDie())
+ signal(SIGPIPE, SIG_IGN);
HttpMethod Mth;
-
return Mth.Loop();
}
projects / apt.git / blobdiff