X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/74eb9ea2c4b00538e3358bb67bf19e74047d340d..9ba25fb7d6ae555a6cdf8772ed49f00bde90af41:/apt-pkg/contrib/fileutl.cc?ds=inline

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 5d294c36a..cce8a4512 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -8,15 +8,15 @@
    CopyFile - Buffered copy of a single file
    GetLock - dpkg compatible lock file manipulation (fcntl)
    
-   This source is placed in the Public Domain, do with it what you will
+   Most of this source is placed in the Public Domain, do with it what 
+   you will
    It was originally written by Jason Gunthorpe <jgg@debian.org>.
    
+   The exception is RunScripts() it is under the GPLv2
+
    ##################################################################### */
 									/*}}}*/
 // Include Files							/*{{{*/
-#ifdef __GNUG__
-#pragma implementation "apt-pkg/fileutl.h"
-#endif 
 #include <apt-pkg/fileutl.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/sptr.h>
@@ -25,6 +25,8 @@
 #include <apti18n.h>
 
 #include <cstdlib>
+#include <cstring>
+
 #include <iostream>
 #include <unistd.h>
 #include <fcntl.h>
@@ -32,13 +34,77 @@
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/wait.h>
+#include <dirent.h>
 #include <signal.h>
 #include <errno.h>
 #include <set>
+#include <algorithm>
 									/*}}}*/
 
 using namespace std;
 
+// RunScripts - Run a set of scripts from a configuration subtree	/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool RunScripts(const char *Cnf)
+{
+   Configuration::Item const *Opts = _config->Tree(Cnf);
+   if (Opts == 0 || Opts->Child == 0)
+      return true;
+   Opts = Opts->Child;
+
+   // Fork for running the system calls
+   pid_t Child = ExecFork();
+   
+   // This is the child
+   if (Child == 0)
+   {
+      if (chdir("/tmp/") != 0)
+	 _exit(100);
+	 
+      unsigned int Count = 1;
+      for (; Opts != 0; Opts = Opts->Next, Count++)
+      {
+	 if (Opts->Value.empty() == true)
+	    continue;
+	 
+	 if (system(Opts->Value.c_str()) != 0)
+	    _exit(100+Count);
+      }
+      _exit(0);
+   }      
+
+   // Wait for the child
+   int Status = 0;
+   while (waitpid(Child,&Status,0) != Child)
+   {
+      if (errno == EINTR)
+	 continue;
+      return _error->Errno("waitpid","Couldn't wait for subprocess");
+   }
+
+   // Restore sig int/quit
+   signal(SIGQUIT,SIG_DFL);
+   signal(SIGINT,SIG_DFL);   
+
+   // Check for an error code.
+   if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
+   {
+      unsigned int Count = WEXITSTATUS(Status);
+      if (Count > 100)
+      {
+	 Count -= 100;
+	 for (; Opts != 0 && Count != 1; Opts = Opts->Next, Count--);
+	 _error->Error("Problem executing scripts %s '%s'",Cnf,Opts->Value.c_str());
+      }
+      
+      return _error->Error("Sub-process returned an error code");
+   }
+   
+   return true;
+}
+									/*}}}*/
+
 // CopyFile - Buffered copy of a file					/*{{{*/
 // ---------------------------------------------------------------------
 /* The caller is expected to set things so that failure causes erasure */
@@ -74,7 +140,9 @@ bool CopyFile(FileFd &From,FileFd &To)
    close at some time. */
 int GetLock(string File,bool Errors)
 {
-   int FD = open(File.c_str(),O_RDWR | O_CREAT | O_TRUNC,0640);
+   // GetLock() is used in aptitude on directories with public-write access
+   // Use O_NOFOLLOW here to prevent symlink traversal attacks
+   int FD = open(File.c_str(),O_RDWR | O_CREAT | O_NOFOLLOW,0640);
    if (FD < 0)
    {
       // Read only .. cant have locking problems there.
@@ -129,6 +197,54 @@ bool FileExists(string File)
    return true;
 }
 									/*}}}*/
+// GetListOfFilesInDir - returns a vector of files in the given dir	/*{{{*/
+// ---------------------------------------------------------------------
+/* If an extension is given only files with this extension are included
+   in the returned vector, otherwise every "normal" file is included. */
+std::vector<string> GetListOfFilesInDir(string const &Dir, string const &Ext,
+					bool const &SortList) 
+{
+   std::vector<string> List;
+   DIR *D = opendir(Dir.c_str());
+   if (D == 0) 
+   {
+      _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
+      return List;
+   }
+
+   for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D)) 
+   {
+      if (Ent->d_name[0] == '.')
+	 continue;
+
+      if (Ext.empty() == false && flExtension(Ent->d_name) != Ext)
+	 continue;
+
+      // Skip bad file names ala run-parts
+      const char *C = Ent->d_name;
+      for (; *C != 0; ++C)
+	 if (isalpha(*C) == 0 && isdigit(*C) == 0
+	     && *C != '_' && *C != '-' && *C != '.')
+	    break;
+
+      if (*C != 0)
+	 continue;
+
+      // Make sure it is a file and not something else
+      string const File = flCombine(Dir,Ent->d_name);
+      struct stat St;
+      if (stat(File.c_str(),&St) != 0 || S_ISREG(St.st_mode) == 0)
+	 continue;
+
+      List.push_back(File);
+   }
+   closedir(D);
+
+   if (SortList == true)
+      std::sort(List.begin(),List.end());
+   return List;
+}
+									/*}}}*/
 // SafeGetCWD - This is a safer getcwd that returns a dynamic string	/*{{{*/
 // ---------------------------------------------------------------------
 /* We return / on failure. */
@@ -384,8 +500,13 @@ bool ExecWait(pid_t Pid,const char *Name,bool Reap)
    {
       if (Reap == true)
 	 return false;
-      if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
-	 return _error->Error(_("Sub-process %s received a segmentation fault."),Name);
+      if (WIFSIGNALED(Status) != 0)
+      {
+	 if( WTERMSIG(Status) == SIGSEGV)
+	    return _error->Error(_("Sub-process %s received a segmentation fault."),Name);
+	 else 
+	    return _error->Error(_("Sub-process %s received signal %u."),Name, WTERMSIG(Status));
+      }
 
       if (WIFEXITED(Status) != 0)
 	 return _error->Error(_("Sub-process %s returned an error code (%u)"),Name,WEXITSTATUS(Status));