Do not consider SHA1 usable

[apt.git] / apt-pkg / contrib / cdromutl.cc

diff --git a/apt-pkg/contrib/cdromutl.cc b/apt-pkg/contrib/cdromutl.cc
index b6524a1785f48e0f258aaf2630460d617377dc55..428ef01616383b210ac1981b0e4d44fef38cf1ec 100644 (file)
--- a/apt-pkg/contrib/cdromutl.cc
+++ b/apt-pkg/contrib/cdromutl.cc
@@ -10,24 +10,32 @@
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/

+#include<config.h>
+

 #include <apt-pkg/cdromutl.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/md5.h>
 #include <apt-pkg/fileutl.h>
 #include <apt-pkg/configuration.h>
 #include <apt-pkg/cdromutl.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/md5.h>
 #include <apt-pkg/fileutl.h>
 #include <apt-pkg/configuration.h>

+#include <apt-pkg/strutl.h>

 
 

-#include <apti18n.h>
-    
-#include <sys/wait.h>
-#include <sys/errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <iostream>
+#include <string>
+#include <vector>

 #include <sys/statvfs.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/statvfs.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <stdio.h>

+
+#include <apti18n.h>

                                                                        /*}}}*/
 
                                                                        /*}}}*/
 

+using std::string;
+

 // IsMounted - Returns true if the mount point is mounted              /*{{{*/
 // ---------------------------------------------------------------------
 /* This is a simple algorithm that should always work, we stat the mount point
 // IsMounted - Returns true if the mount point is mounted              /*{{{*/
 // ---------------------------------------------------------------------
 /* This is a simple algorithm that should always work, we stat the mount point


@@ -38,13 +46,18 @@ bool IsMounted(string &Path)
 {
    if (Path.empty() == true)
       return false;
 {
    if (Path.empty() == true)
       return false;

-   
+

    // Need that trailing slash for directories
    if (Path[Path.length() - 1] != '/')
       Path += '/';
    // Need that trailing slash for directories
    if (Path[Path.length() - 1] != '/')
       Path += '/';

-   
-   /* First we check if the path is actualy mounted, we do this by
-      stating the path and the previous directory (carefull of links!)
+
+   // if the path has a ".disk" directory we treat it as mounted
+   // this way even extracted copies of disks are recognized
+   if (DirectoryExists(Path + ".disk/") == true)
+      return true;
+
+   /* First we check if the path is actually mounted, we do this by
+      stating the path and the previous directory (careful of links!)

       and comparing their device fields. */
    struct stat Buf,Buf2;
    if (stat(Path.c_str(),&Buf) != 0 || 
       and comparing their device fields. */
    struct stat Buf,Buf2;
    if (stat(Path.c_str(),&Buf) != 0 || 


@@ -62,56 +75,78 @@ bool IsMounted(string &Path)
    leave /etc/mtab inconsitant. We drop all messages this produces. */
 bool UnmountCdrom(string Path)
 {
    leave /etc/mtab inconsitant. We drop all messages this produces. */
 bool UnmountCdrom(string Path)
 {

-   if (IsMounted(Path) == false)
+   // do not generate errors, even if the mountpoint does not exist
+   // the mountpoint might be auto-created by the mount command
+   // and a non-existing mountpoint is surely not mounted
+   _error->PushToStack();
+   bool const mounted = IsMounted(Path);
+   _error->RevertToStack();
+   if (mounted == false)

       return true;
       return true;

-   
-   int Child = ExecFork();

 
 

-   // The child
-   if (Child == 0)
+   for (int i=0;i<3;i++)

    {
    {

-      // Make all the fds /dev/null
-      for (int I = 0; I != 3; I++)
-        dup2(open("/dev/null",O_RDWR),I);
+   
+      int Child = ExecFork();

 
 

-      if (_config->Exists("Acquire::cdrom::"+Path+"::UMount") == true)
+      // The child
+      if (Child == 0)

       {
       {

-        if (system(_config->Find("Acquire::cdrom::"+Path+"::UMount").c_str()) != 0)
+        // Make all the fds /dev/null
+        int const null_fd = open("/dev/null",O_RDWR);
+        for (int I = 0; I != 3; ++I)
+           dup2(null_fd, I);
+
+        if (_config->Exists("Acquire::cdrom::"+Path+"::UMount") == true)
+        {
+           if (system(_config->Find("Acquire::cdrom::"+Path+"::UMount").c_str()) != 0)
+              _exit(100);
+           _exit(0);            
+        }
+        else
+        {
+           const char *Args[10];
+           Args[0] = "umount";
+           Args[1] = Path.c_str();
+           Args[2] = 0;
+           execvp(Args[0],(char **)Args);      

            _exit(100);
            _exit(100);

-        _exit(0);               
+        }      

       }
       }

-      else
-      {
-        const char *Args[10];
-        Args[0] = "umount";
-        Args[1] = Path.c_str();
-        Args[2] = 0;
-        execvp(Args[0],(char **)Args);      
-        _exit(100);
-      }      
+
+      // if it can not be umounted, give it a bit more time
+      // this can happen when auto-mount magic or fs/cdrom prober attack
+      if (ExecWait(Child,"umount",true) == true)
+        return true;
+      sleep(1);

    }
 
    }
 

-   // Wait for mount
-   return ExecWait(Child,"umount",true);
+   return false;

 }
                                                                        /*}}}*/
 // MountCdrom - Mount a cdrom                                          /*{{{*/
 // ---------------------------------------------------------------------
 /* We fork mount and drop all messages */
 }
                                                                        /*}}}*/
 // MountCdrom - Mount a cdrom                                          /*{{{*/
 // ---------------------------------------------------------------------
 /* We fork mount and drop all messages */

-bool MountCdrom(string Path)
+bool MountCdrom(string Path, string DeviceName)

 {
 {

-   if (IsMounted(Path) == true)
+   // do not generate errors, even if the mountpoint does not exist
+   // the mountpoint might be auto-created by the mount command
+   _error->PushToStack();
+   bool const mounted = IsMounted(Path);
+   _error->RevertToStack();
+   if (mounted == true)

       return true;
       return true;

-   
+

    int Child = ExecFork();
 
    // The child
    if (Child == 0)
    {
       // Make all the fds /dev/null
    int Child = ExecFork();
 
    // The child
    if (Child == 0)
    {
       // Make all the fds /dev/null

-      for (int I = 0; I != 3; I++)
-        dup2(open("/dev/null",O_RDWR),I);
-      
+      int const null_fd = open("/dev/null",O_RDWR);
+      for (int I = 0; I != 3; ++I)
+        dup2(null_fd, I);
+

       if (_config->Exists("Acquire::cdrom::"+Path+"::Mount") == true)
       {
         if (system(_config->Find("Acquire::cdrom::"+Path+"::Mount").c_str()) != 0)
       if (_config->Exists("Acquire::cdrom::"+Path+"::Mount") == true)
       {
         if (system(_config->Find("Acquire::cdrom::"+Path+"::Mount").c_str()) != 0)


@@ -122,8 +157,15 @@ bool MountCdrom(string Path)
       {
         const char *Args[10];
         Args[0] = "mount";
       {
         const char *Args[10];
         Args[0] = "mount";

-        Args[1] = Path.c_str();
-        Args[2] = 0;
+        if (DeviceName == "") 
+        {
+           Args[1] = Path.c_str();
+           Args[2] = 0;
+        } else {
+           Args[1] = DeviceName.c_str();
+           Args[2] = Path.c_str();
+           Args[3] = 0;
+        }

         execvp(Args[0],(char **)Args);      
         _exit(100);
       }      
         execvp(Args[0],(char **)Args);      
         _exit(100);
       }      


@@ -140,6 +182,19 @@ bool MountCdrom(string Path)
 bool IdentCdrom(string CD,string &Res,unsigned int Version)
 {
    MD5Summation Hash;
 bool IdentCdrom(string CD,string &Res,unsigned int Version)
 {
    MD5Summation Hash;

+   bool writable_media = false;
+
+   // if we are on a writable medium (like a usb-stick) that is just
+   // used like a cdrom don't use "." as it will constantly change,
+   // use .disk instead
+   if (access(CD.c_str(), W_OK) == 0 && DirectoryExists(CD+string("/.disk"))) 
+   {
+      writable_media = true;
+      CD = CD.append("/.disk");
+      if (_config->FindB("Debug::aptcdrom",false) == true)
+         std::clog << "Found writable cdrom, using alternative path: " << CD
+                   << std::endl;
+   }

 
    string StartDir = SafeGetCWD();
    if (chdir(CD.c_str()) != 0)
 
    string StartDir = SafeGetCWD();
    if (chdir(CD.c_str()) != 0)


@@ -152,7 +207,6 @@ bool IdentCdrom(string CD,string &Res,unsigned int Version)
    /* Run over the directory, we assume that the reader order will never
       change as the media is read-only. In theory if the kernel did
       some sort of wacked caching this might not be true.. */
    /* Run over the directory, we assume that the reader order will never
       change as the media is read-only. In theory if the kernel did
       some sort of wacked caching this might not be true.. */

-   char S[300];

    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
    {
       // Skip some files..
    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
    {
       // Skip some files..


@@ -160,43 +214,86 @@ bool IdentCdrom(string CD,string &Res,unsigned int Version)
          strcmp(Dir->d_name,"..") == 0)
         continue;
 
          strcmp(Dir->d_name,"..") == 0)
         continue;
 

+      std::string S;

       if (Version <= 1)
       {
       if (Version <= 1)
       {

-        sprintf(S,"%lu",(unsigned long)Dir->d_ino);
+        strprintf(S, "%lu", (unsigned long)Dir->d_ino);

       }
       else
       {
         struct stat Buf;
         if (stat(Dir->d_name,&Buf) != 0)
            continue;
       }
       else
       {
         struct stat Buf;
         if (stat(Dir->d_name,&Buf) != 0)
            continue;

-        sprintf(S,"%lu",(unsigned long)Buf.st_mtime);
+        strprintf(S, "%lu", (unsigned long)Buf.st_mtime);

       }
       }

-      
-      Hash.Add(S);
+
+      Hash.Add(S.c_str());

       Hash.Add(Dir->d_name);
    };
       Hash.Add(Dir->d_name);
    };

-   
-   if (chdir(StartDir.c_str()) != 0)
-      return _error->Errno("chdir",_("Unable to change to %s"),StartDir.c_str());
+
+   if (chdir(StartDir.c_str()) != 0) {
+      _error->Errno("chdir",_("Unable to change to %s"),StartDir.c_str());
+      closedir(D);
+      return false;
+   }

    closedir(D);
    closedir(D);

-   
+

    // Some stats from the fsys
    // Some stats from the fsys

+   std::string S;

    if (_config->FindB("Debug::identcdrom",false) == false)
    {
       struct statvfs Buf;
       if (statvfs(CD.c_str(),&Buf) != 0)
         return _error->Errno("statfs",_("Failed to stat the cdrom"));
    if (_config->FindB("Debug::identcdrom",false) == false)
    {
       struct statvfs Buf;
       if (statvfs(CD.c_str(),&Buf) != 0)
         return _error->Errno("statfs",_("Failed to stat the cdrom"));

-      
+

       // We use a kilobyte block size to advoid overflow
       // We use a kilobyte block size to advoid overflow

-      sprintf(S,"%lu %lu",(long)(Buf.f_blocks*(Buf.f_bsize/1024)),
-             (long)(Buf.f_bfree*(Buf.f_bsize/1024)));
-      Hash.Add(S);
-      sprintf(S,"-%u",Version);
+      if (writable_media)
+      {
+         strprintf(S, "%lu", (unsigned long)(Buf.f_blocks*(Buf.f_bsize/1024)));
+      } else {
+         strprintf(S, "%lu %lu", (unsigned long)(Buf.f_blocks*(Buf.f_bsize/1024)),
+                 (unsigned long)(Buf.f_bfree*(Buf.f_bsize/1024)));
+      }
+      Hash.Add(S.c_str());
+      strprintf(S, "-%u", Version);

    }
    else
    }
    else

-      sprintf(S,"-%u.debug",Version);
-   
+      strprintf(S, "-%u.debug", Version);
+

    Res = Hash.Result().Value() + S;
    Res = Hash.Result().Value() + S;

-   return true;   
+   return true;
+}
+                                                                       /*}}}*/
+// FindMountPointForDevice - Find mountpoint for the given device      /*{{{*/
+string FindMountPointForDevice(const char *devnode)
+{
+   // this is the order that mount uses as well
+   std::vector<std::string> const mounts = _config->FindVector("Dir::state::MountPoints", "/etc/mtab,/proc/mount");
+
+   for (std::vector<std::string>::const_iterator m = mounts.begin(); m != mounts.end(); ++m)
+      if (FileExists(*m) == true)
+      {
+        char * line = NULL;
+        size_t line_len = 0;
+        FILE * f = fopen(m->c_str(), "r");
+        while(getline(&line, &line_len, f) != -1)
+        {
+           char * out[] = { NULL, NULL, NULL };
+           TokSplitString(' ', line, out, 3);
+           if (out[2] != NULL || out[1] == NULL || out[0] == NULL)
+              continue;
+           if (strcmp(out[0], devnode) != 0)
+              continue;
+           fclose(f);
+           // unescape the \0XXX chars in the path
+           string mount_point = out[1];
+           free(line);
+           return DeEscapeString(mount_point);
+        }
+        fclose(f);
+        free(line);
+      }
+
+   return string();

 }
                                                                        /*}}}*/
 }
                                                                        /*}}}*/