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-rw-r--r--apt-pkg/versionmatch.cc307
1 files changed, 307 insertions, 0 deletions
diff --git a/apt-pkg/versionmatch.cc b/apt-pkg/versionmatch.cc
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+++ b/apt-pkg/versionmatch.cc
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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ Version Matching
+
+ This module takes a matching string and a type and locates the version
+ record that satisfies the constraint described by the matching string.
+
+ ##################################################################### */
+ /*}}}*/
+// Include Files /*{{{*/
+#include <config.h>
+
+#include <apt-pkg/error.h>
+#include <apt-pkg/pkgcache.h>
+#include <apt-pkg/strutl.h>
+#include <apt-pkg/versionmatch.h>
+
+#include <cctype>
+#include <cstddef>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <fnmatch.h>
+#include <regex.h>
+ /*}}}*/
+
+using std::string;
+
+// VersionMatch::pkgVersionMatch - Constructor /*{{{*/
+// ---------------------------------------------------------------------
+/* Break up the data string according to the selected type */
+pkgVersionMatch::pkgVersionMatch(string Data,MatchType Type) : Type(Type)
+{
+ MatchAll = false;
+ VerPrefixMatch = false;
+ RelVerPrefixMatch = false;
+
+ if (Type == None || Data.length() < 1)
+ return;
+
+ // Cut up the version representation
+ if (Type == Version)
+ {
+ if (Data.end()[-1] == '*')
+ {
+ VerPrefixMatch = true;
+ VerStr = string(Data,0,Data.length()-1);
+ }
+ else
+ VerStr = Data;
+ return;
+ }
+
+ if (Type == Release)
+ {
+ // All empty = match all
+ if (Data == "*")
+ {
+ MatchAll = true;
+ return;
+ }
+
+ // Are we a simple specification?
+ string::const_iterator I = Data.begin();
+ for (; I != Data.end() && *I != '='; ++I);
+ if (I == Data.end())
+ {
+ // Temporary
+ if (isdigit(Data[0]))
+ RelVerStr = Data;
+ else
+ RelRelease = Data;
+
+ if (RelVerStr.length() > 0 && RelVerStr.end()[-1] == '*')
+ {
+ RelVerPrefixMatch = true;
+ RelVerStr = string(RelVerStr.begin(),RelVerStr.end()-1);
+ }
+ return;
+ }
+
+ char Spec[300];
+ char *Fragments[20];
+ snprintf(Spec,sizeof(Spec),"%s",Data.c_str());
+ if (TokSplitString(',',Spec,Fragments,
+ sizeof(Fragments)/sizeof(Fragments[0])) == false)
+ {
+ Type = None;
+ return;
+ }
+
+ for (unsigned J = 0; Fragments[J] != 0; J++)
+ {
+ if (strlen(Fragments[J]) < 3)
+ continue;
+
+ if (stringcasecmp(Fragments[J],Fragments[J]+2,"v=") == 0)
+ RelVerStr = Fragments[J]+2;
+ else if (stringcasecmp(Fragments[J],Fragments[J]+2,"o=") == 0)
+ RelOrigin = Fragments[J]+2;
+ else if (stringcasecmp(Fragments[J],Fragments[J]+2,"a=") == 0)
+ RelArchive = Fragments[J]+2;
+ else if (stringcasecmp(Fragments[J],Fragments[J]+2,"n=") == 0)
+ RelCodename = Fragments[J]+2;
+ else if (stringcasecmp(Fragments[J],Fragments[J]+2,"l=") == 0)
+ RelLabel = Fragments[J]+2;
+ else if (stringcasecmp(Fragments[J],Fragments[J]+2,"c=") == 0)
+ RelComponent = Fragments[J]+2;
+ else if (stringcasecmp(Fragments[J],Fragments[J]+2,"b=") == 0)
+ RelArchitecture = Fragments[J]+2;
+ }
+
+ if (RelVerStr.end()[-1] == '*')
+ {
+ RelVerPrefixMatch = true;
+ RelVerStr = string(RelVerStr.begin(),RelVerStr.end()-1);
+ }
+ return;
+ }
+
+ if (Type == Origin)
+ {
+ if (Data[0] == '"' && Data.length() >= 2 && Data.end()[-1] == '"')
+ OrSite = Data.substr(1, Data.length() - 2);
+ else
+ OrSite = Data;
+ return;
+ }
+}
+ /*}}}*/
+// VersionMatch::MatchVer - Match a version string with prefixing /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgVersionMatch::MatchVer(const char *A,string B,bool Prefix)
+{
+ if (A == NULL)
+ return false;
+
+ const char *Ab = A;
+ const char *Ae = Ab + strlen(A);
+
+ // Strings are not a compatible size.
+ if (((unsigned)(Ae - Ab) != B.length() && Prefix == false) ||
+ (unsigned)(Ae - Ab) < B.length())
+ return false;
+
+ // Match (leading?)
+ if (stringcasecmp(B,Ab,Ab + B.length()) == 0)
+ return true;
+
+ return false;
+}
+ /*}}}*/
+// VersionMatch::Find - Locate the best match for the select type /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+pkgCache::VerIterator pkgVersionMatch::Find(pkgCache::PkgIterator Pkg)
+{
+ for (auto Ver = Pkg.VersionList(); not Ver.end(); ++Ver)
+ if (VersionMatches(Ver))
+ return Ver;
+ // check if the package provides itself in a matching version
+ for (auto Prov = Pkg.ProvidesList(); not Prov.end(); ++Prov)
+ if (Prov->ProvideVersion != 0 && Prov.OwnerPkg() == Prov.ParentPkg())
+ if (MatchVer(Prov.ProvideVersion(), VerStr, VerPrefixMatch) ||
+ ExpressionMatches(VerStr, Prov.ProvideVersion()))
+ return Prov.OwnerVer();
+ return pkgCache::VerIterator{};
+}
+ /*}}}*/
+
+// VersionMatch::Find - Locate the best match for the select type /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgVersionMatch::VersionMatches(pkgCache::VerIterator Ver)
+{
+ if (Type == Version)
+ {
+ if (MatchVer(Ver.VerStr(),VerStr,VerPrefixMatch) == true)
+ return true;
+ if (ExpressionMatches(VerStr, Ver.VerStr()) == true)
+ return true;
+ return false;
+ }
+
+ for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; ++VF)
+ if (FileMatch(VF.File()) == true)
+ return true;
+
+ return false;
+}
+ /*}}}*/
+
+#ifndef FNM_CASEFOLD
+#define FNM_CASEFOLD 0
+#endif
+
+bool pkgVersionMatch::ExpressionMatches(const char *pattern, const char *string)/*{{{*/
+{
+ if (pattern == NULL || string == NULL)
+ return false;
+ if (pattern[0] == '/') {
+ size_t length = strlen(pattern);
+ if (pattern[length - 1] == '/') {
+ bool res = false;
+ regex_t preg;
+ char *regex = strdup(pattern + 1);
+ regex[length - 2] = '\0';
+ if (regcomp(&preg, regex, REG_EXTENDED | REG_ICASE) != 0) {
+ _error->Warning("Invalid regular expression: %s", regex);
+ } else if (regexec(&preg, string, 0, NULL, 0) == 0) {
+ res = true;
+ }
+ free(regex);
+ regfree(&preg);
+ return res;
+ }
+ }
+ return fnmatch(pattern, string, FNM_CASEFOLD) == 0;
+}
+bool pkgVersionMatch::ExpressionMatches(const std::string& pattern, const char *string)
+{
+ return ExpressionMatches(pattern.c_str(), string);
+}
+ /*}}}*/
+// VersionMatch::FileMatch - Match against an index file /*{{{*/
+// ---------------------------------------------------------------------
+/* This matcher checks against the release file and the origin location
+ to see if the constraints are met. */
+bool pkgVersionMatch::FileMatch(pkgCache::RlsFileIterator const &File)
+{
+ if (Type == Release)
+ {
+ if (MatchAll)
+ return true;
+
+ if (RelVerStr.empty() && RelOrigin.empty() &&
+ RelArchive.empty() && RelLabel.empty() &&
+ RelRelease.empty() && RelCodename.empty() &&
+ RelComponent.empty() && RelArchitecture.empty())
+ return false;
+
+ if (not RelVerStr.empty() && not MatchVer(File.Version(), RelVerStr, RelVerPrefixMatch) &&
+ not ExpressionMatches(RelVerStr, File.Version()))
+ return false;
+ if (not RelOrigin.empty() && not ExpressionMatches(RelOrigin, File.Origin()))
+ return false;
+ if (not RelArchive.empty() && not ExpressionMatches(RelArchive, File.Archive()))
+ return false;
+ if (not RelCodename.empty() && not ExpressionMatches(RelCodename, File.Codename()))
+ return false;
+ if (not RelRelease.empty() && not ExpressionMatches(RelRelease, File.Archive()) &&
+ not ExpressionMatches(RelRelease, File.Codename()))
+ return false;
+ if (not RelLabel.empty() && not ExpressionMatches(RelLabel, File.Label()))
+ return false;
+ return true;
+ }
+
+ if (Type == Origin)
+ {
+ if (not OrSite.empty() && File.Site() == nullptr)
+ return false;
+ return ExpressionMatches(OrSite, File.Site()); /* both strings match */
+ }
+
+ return false;
+}
+bool pkgVersionMatch::FileMatch(pkgCache::PkgFileIterator File)
+{
+ if (auto const RlsFile = File.ReleaseFile(); not RlsFile.end())
+ {
+ if (not FileMatch(RlsFile))
+ return false;
+ }
+ else if (Type == Release)
+ {
+ // only 'bad' files like dpkg.status file have no release file
+ // those reuse the Component of te PkgFile to store the Archive "now".
+ if (not RelArchive.empty() && not ExpressionMatches(RelArchive, File.Component()))
+ return false;
+ if (not RelRelease.empty() && not ExpressionMatches(RelRelease, File.Component()))
+ return false;
+ if (not RelOrigin.empty() || not RelLabel.empty() ||
+ not RelVerStr.empty() || not RelCodename.empty())
+ return false;
+ }
+ else
+ return false;
+
+ if (Type == Release)
+ {
+ if (MatchAll)
+ return true;
+
+ if (not RelComponent.empty() && not ExpressionMatches(RelComponent, File.Component()))
+ return false;
+ if (not RelArchitecture.empty() && not ExpressionMatches(RelArchitecture, File.Architecture()))
+ return false;
+ }
+
+ return true;
+}
+ /*}}}*/
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