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-rw-r--r--methods/rred.cc124
1 files changed, 97 insertions, 27 deletions
diff --git a/methods/rred.cc b/methods/rred.cc
index 554ac99b4..91b6dda22 100644
--- a/methods/rred.cc
+++ b/methods/rred.cc
@@ -21,6 +21,7 @@
#include <vector>
#include <assert.h>
+#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -35,7 +36,7 @@ class MemBlock {
char *start;
size_t size;
char *free;
- struct MemBlock *next;
+ MemBlock *next;
MemBlock(size_t size) : size(size), next(NULL)
{
@@ -116,7 +117,7 @@ struct Change {
size_t add_len; /* bytes */
char *add;
- Change(int off)
+ Change(size_t off)
{
offset = off;
del_cnt = add_cnt = add_len = 0;
@@ -388,28 +389,37 @@ class Patch {
public:
- void read_diff(FileFd &f)
+ bool read_diff(FileFd &f, Hashes * const h)
{
char buffer[BLOCK_SIZE];
bool cmdwanted = true;
- Change ch(0);
- while(f.ReadLine(buffer, sizeof(buffer)))
- {
+ Change ch(std::numeric_limits<size_t>::max());
+ if (f.ReadLine(buffer, sizeof(buffer)) == NULL)
+ return _error->Error("Reading first line of patchfile %s failed", f.Name().c_str());
+ do {
+ if (h != NULL)
+ h->Add(buffer);
if (cmdwanted) {
char *m, *c;
size_t s, e;
- s = strtol(buffer, &m, 10);
- if (m == buffer) {
- s = e = ch.offset + ch.add_cnt;
- c = buffer;
- } else if (*m == ',') {
- m++;
+ errno = 0;
+ s = strtoul(buffer, &m, 10);
+ if (unlikely(m == buffer || s == std::numeric_limits<unsigned long>::max() || errno != 0))
+ return _error->Error("Parsing patchfile %s failed: Expected an effected line start", f.Name().c_str());
+ else if (*m == ',') {
+ ++m;
e = strtol(m, &c, 10);
+ if (unlikely(m == c || e == std::numeric_limits<unsigned long>::max() || errno != 0))
+ return _error->Error("Parsing patchfile %s failed: Expected an effected line end", f.Name().c_str());
+ if (unlikely(e < s))
+ return _error->Error("Parsing patchfile %s failed: Effected lines end %lu is before start %lu", f.Name().c_str(), e, s);
} else {
e = s;
c = m;
}
+ if (s > ch.offset)
+ return _error->Error("Parsing patchfile %s failed: Effected line is after previous effected line", f.Name().c_str());
switch(*c) {
case 'a':
cmdwanted = false;
@@ -420,6 +430,8 @@ class Patch {
ch.del_cnt = 0;
break;
case 'c':
+ if (unlikely(s == 0))
+ return _error->Error("Parsing patchfile %s failed: Change command can't effect line zero", f.Name().c_str());
cmdwanted = false;
ch.add = NULL;
ch.add_cnt = 0;
@@ -428,6 +440,8 @@ class Patch {
ch.del_cnt = e - s + 1;
break;
case 'd':
+ if (unlikely(s == 0))
+ return _error->Error("Parsing patchfile %s failed: Delete command can't effect line zero", f.Name().c_str());
ch.offset = s - 1;
ch.del_cnt = e - s + 1;
ch.add = NULL;
@@ -435,9 +449,11 @@ class Patch {
ch.add_len = 0;
filechanges.add_change(ch);
break;
+ default:
+ return _error->Error("Parsing patchfile %s failed: Unknown command", f.Name().c_str());
}
} else { /* !cmdwanted */
- if (buffer[0] == '.' && buffer[1] == '\n') {
+ if (strcmp(buffer, ".\n") == 0) {
cmdwanted = true;
filechanges.add_change(ch);
} else {
@@ -463,7 +479,8 @@ class Patch {
}
}
}
- }
+ } while(f.ReadLine(buffer, sizeof(buffer)));
+ return true;
}
void write_diff(FILE *f)
@@ -519,8 +536,29 @@ class RredMethod : public pkgAcqMethod {
private:
bool Debug;
+ struct PDiffFile {
+ std::string FileName;
+ HashStringList ExpectedHashes;
+ PDiffFile(std::string const &FileName, HashStringList const &ExpectedHashes) :
+ FileName(FileName), ExpectedHashes(ExpectedHashes) {}
+ };
+
+ HashStringList ReadExpectedHashesForPatch(unsigned int const patch, std::string const &Message)
+ {
+ HashStringList ExpectedHashes;
+ for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+ {
+ std::string tagname;
+ strprintf(tagname, "Patch-%d-%s-Hash", patch, *type);
+ std::string const hashsum = LookupTag(Message, tagname.c_str());
+ if (hashsum.empty() == false)
+ ExpectedHashes.push_back(HashString(*type, hashsum));
+ }
+ return ExpectedHashes;
+ }
+
protected:
- virtual bool Fetch(FetchItem *Itm) {
+ virtual bool URIAcquire(std::string const &Message, FetchItem *Itm) APT_OVERRIDE {
Debug = _config->FindB("Debug::pkgAcquire::RRed", false);
URI Get = Itm->Uri;
std::string Path = Get.Host + Get.Path; // rred:/path - no host
@@ -534,11 +572,17 @@ class RredMethod : public pkgAcqMethod {
} else
URIStart(Res);
- std::vector<std::string> patchpaths;
+ std::vector<PDiffFile> patchfiles;
Patch patch;
if (FileExists(Path + ".ed") == true)
- patchpaths.push_back(Path + ".ed");
+ {
+ HashStringList const ExpectedHashes = ReadExpectedHashesForPatch(0, Message);
+ std::string const FileName = Path + ".ed";
+ if (ExpectedHashes.usable() == false)
+ return _error->Error("No hashes found for uncompressed patch: %s", FileName.c_str());
+ patchfiles.push_back(PDiffFile(FileName, ExpectedHashes));
+ }
else
{
_error->PushToStack();
@@ -546,31 +590,44 @@ class RredMethod : public pkgAcqMethod {
_error->RevertToStack();
std::string const baseName = Path + ".ed.";
+ unsigned int seen_patches = 0;
for (std::vector<std::string>::const_iterator p = patches.begin();
p != patches.end(); ++p)
+ {
if (p->compare(0, baseName.length(), baseName) == 0)
- patchpaths.push_back(*p);
+ {
+ HashStringList const ExpectedHashes = ReadExpectedHashesForPatch(seen_patches, Message);
+ if (ExpectedHashes.usable() == false)
+ return _error->Error("No hashes found for uncompressed patch %d: %s", seen_patches, p->c_str());
+ patchfiles.push_back(PDiffFile(*p, ExpectedHashes));
+ ++seen_patches;
+ }
+ }
}
std::string patch_name;
- for (std::vector<std::string>::iterator I = patchpaths.begin();
- I != patchpaths.end();
+ for (std::vector<PDiffFile>::iterator I = patchfiles.begin();
+ I != patchfiles.end();
++I)
{
- patch_name = *I;
+ patch_name = I->FileName;
if (Debug == true)
std::clog << "Patching " << Path << " with " << patch_name
<< std::endl;
FileFd p;
+ Hashes patch_hash(I->ExpectedHashes);
// all patches are compressed, even if the name doesn't reflect it
- if (p.Open(patch_name, FileFd::ReadOnly, FileFd::Gzip) == false) {
- std::cerr << "Could not open patch file " << patch_name << std::endl;
+ if (p.Open(patch_name, FileFd::ReadOnly, FileFd::Gzip) == false ||
+ patch.read_diff(p, &patch_hash) == false)
+ {
_error->DumpErrors(std::cerr);
- abort();
+ return false;
}
- patch.read_diff(p);
p.Close();
+ HashStringList const hsl = patch_hash.GetHashStringList();
+ if (hsl != I->ExpectedHashes)
+ return _error->Error("Hash Sum mismatch for uncompressed patch %s", patch_name.c_str());
}
if (Debug == true)
@@ -582,7 +639,6 @@ class RredMethod : public pkgAcqMethod {
FILE *out = fopen(Itm->DestFile.c_str(), "w");
Hashes hash(Itm->ExpectedHashes);
-
patch.apply_against_file(out, inp, &hash);
fclose(out);
@@ -615,6 +671,16 @@ class RredMethod : public pkgAcqMethod {
return true;
}
+ bool Configuration(std::string Message) APT_OVERRIDE
+ {
+ if (pkgAcqMethod::Configuration(Message) == false)
+ return false;
+
+ DropPrivsOrDie();
+
+ return true;
+ }
+
public:
RredMethod() : pkgAcqMethod("2.0",SingleInstance | SendConfig), Debug(false) {}
};
@@ -643,7 +709,11 @@ int main(int argc, char **argv)
_error->DumpErrors(std::cerr);
exit(1);
}
- patch.read_diff(p);
+ if (patch.read_diff(p, NULL) == false)
+ {
+ _error->DumpErrors(std::cerr);
+ exit(2);
+ }
}
if (just_diff) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-23 08:20:48 +0000