X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/bb0193aff3e044e93006ee7ad0aaef1a82adaeee..6a694c5663666f6f88c5f691de57f48ee1f52b2c:/IkiWiki/Wrapper.pm

diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm
index 4966c453a..5427a5c80 100644
--- a/IkiWiki/Wrapper.pm
+++ b/IkiWiki/Wrapper.pm
@@ -1,80 +1,173 @@
 #!/usr/bin/perl
 
+package IkiWiki;
+
 use warnings;
 use strict;
-use Cwd q{abs_path};
+use File::Spec;
 use Data::Dumper;
+use IkiWiki;
 
-package IkiWiki;
-
-sub gen_wrapper () { #{{{
-	$config{srcdir}=abs_path($config{srcdir});
-	$config{destdir}=abs_path($config{destdir});
-	my $this=abs_path($0);
+sub gen_wrapper () {
+	$config{srcdir}=File::Spec->rel2abs($config{srcdir});
+	$config{destdir}=File::Spec->rel2abs($config{destdir});
+	my $this=File::Spec->rel2abs($0);
 	if (! -x $this) {
-		error("$this doesn't seem to be executable");
+		error(sprintf(gettext("%s doesn't seem to be executable"), $this));
 	}
 
 	if ($config{setup}) {
-		error("cannot create a wrapper that uses a setup file");
+		error(gettext("cannot create a wrapper that uses a setup file"));
 	}
 	my $wrapper=possibly_foolish_untaint($config{wrapper});
+	if (! defined $wrapper || ! length $wrapper) {
+		error(gettext("wrapper filename not specified"));
+	}
 	delete $config{wrapper};
 	
 	my @envsave;
 	push @envsave, qw{REMOTE_ADDR QUERY_STRING REQUEST_METHOD REQUEST_URI
 	               CONTENT_TYPE CONTENT_LENGTH GATEWAY_INTERFACE
-		       HTTP_COOKIE} if $config{cgi};
+		       HTTP_COOKIE REMOTE_USER HTTPS REDIRECT_STATUS
+		       REDIRECT_URL} if $config{cgi};
 	my $envsave="";
 	foreach my $var (@envsave) {
-		$envsave.=<<"EOF"
+		$envsave.=<<"EOF";
 	if ((s=getenv("$var")))
-		asprintf(&newenviron[i++], "%s=%s", "$var", s);
+		addenv("$var", s);
 EOF
 	}
 	
+	my @wrapper_hooks;
+	run_hooks(genwrapper => sub { push @wrapper_hooks, shift->() });
+
+	my $check_commit_hook="";
+	my $pre_exec="";
+	if ($config{post_commit}) {
+		# Optimise checking !commit_hook_enabled() , 
+		# so that ikiwiki does not have to be started if the
+		# hook is disabled.
+		#
+		# Note that perl's flock may be implemented using fcntl
+		# or lockf on some systems. If so, and if there is no
+		# interop between the locking systems, the true C flock will
+		# always succeed, and this optimisation won't work.
+		# The perl code will later correctly check the lock,
+		# so the right thing will still happen, though without
+		# the benefit of this optimisation.
+		$check_commit_hook=<<"EOF";
+	{
+		int fd=open("$config{wikistatedir}/commitlock", O_CREAT | O_RDWR, 0666);
+		if (fd != -1) {
+			if (flock(fd, LOCK_SH | LOCK_NB) != 0)
+				exit(0);
+			close(fd);
+		}
+	}
+EOF
+	}
+	elsif ($config{cgi}) {
+		# Avoid more than one ikiwiki cgi running at a time by
+		# taking a cgi lock. Since ikiwiki uses several MB of
+		# memory, a pile up of processes could cause thrashing
+		# otherwise. The fd of the lock is stored in
+		# IKIWIKI_CGILOCK_FD so unlockwiki can close it.
+		$pre_exec=<<"EOF";
+	{
+		int fd=open("$config{wikistatedir}/cgilock", O_CREAT | O_RDWR, 0666);
+		if (fd != -1 && flock(fd, LOCK_EX) == 0) {
+			char *fd_s;
+			asprintf(&fd_s, "%i", fd);
+			setenv("IKIWIKI_CGILOCK_FD", fd_s, 1);
+		}
+	}
+EOF
+	}
+
 	$Data::Dumper::Indent=0; # no newlines
 	my $configstring=Data::Dumper->Dump([\%config], ['*config']);
 	$configstring=~s/\\/\\\\/g;
 	$configstring=~s/"/\\"/g;
+	$configstring=~s/\n/\\n/g;
 	
-	open(OUT, ">ikiwiki-wrap.c") || error("failed to write ikiwiki-wrap.c: $!");;
-	print OUT <<"EOF";
+	writefile(basename("$wrapper.c"), dirname($wrapper), <<"EOF");
 /* A wrapper for ikiwiki, can be safely made suid. */
-#define _GNU_SOURCE
 #include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/file.h>
 
 extern char **environ;
+char *newenviron[$#envsave+6];
+int i=0;
+
+addenv(char *var, char *val) {
+	char *s=malloc(strlen(var)+1+strlen(val)+1);
+	if (!s)
+		perror("malloc");
+	sprintf(s, "%s=%s", var, val);
+	newenviron[i++]=s;
+}
 
 int main (int argc, char **argv) {
-	/* Sanitize environment. */
 	char *s;
-	char *newenviron[$#envsave+4];
-	int i=0;
+
+$check_commit_hook
+@wrapper_hooks
 $envsave
 	newenviron[i++]="HOME=$ENV{HOME}";
 	newenviron[i++]="WRAPPED_OPTIONS=$configstring";
 	newenviron[i]=NULL;
 	environ=newenviron;
 
+	if (setregid(getegid(), -1) != 0 &&
+	    setregid(getegid(), -1) != 0) {
+		perror("failed to drop real gid");
+		exit(1);
+	}
+	if (setreuid(geteuid(), -1) != 0 &&
+	    setreuid(geteuid(), -1) != 0) {
+		perror("failed to drop real uid");
+		exit(1);
+	}
+
+$pre_exec
 	execl("$this", "$this", NULL);
-	perror("failed to run $this");
+	perror("exec $this");
 	exit(1);
 }
 EOF
-	close OUT;
-	if (system("gcc", "ikiwiki-wrap.c", "-o", $wrapper) != 0) {
-		error("failed to compile ikiwiki-wrap.c");
+
+	my @cc=exists $ENV{CC} ? possibly_foolish_untaint($ENV{CC}) : 'cc';
+	push @cc, possibly_foolish_untaint($ENV{CFLAGS}) if exists $ENV{CFLAGS};
+	if (system(@cc, "$wrapper.c", "-o", "$wrapper.new") != 0) {
+		#translators: The parameter is a C filename.
+		error(sprintf(gettext("failed to compile %s"), "$wrapper.c"));
+	}
+	unlink("$wrapper.c");
+	if (defined $config{wrappergroup}) {
+		my $gid=(getgrnam($config{wrappergroup}))[2];
+		if (! defined $gid) {
+			error(sprintf("bad wrappergroup"));
+		}
+		if (! chown(-1, $gid, "$wrapper.new")) {
+			error("chown $wrapper.new: $!");
+		}
 	}
-	unlink("ikiwiki-wrap.c");
 	if (defined $config{wrappermode} &&
-	    ! chmod(oct($config{wrappermode}), $wrapper)) {
-		error("chmod $wrapper: $!");
+	    ! chmod(oct($config{wrappermode}), "$wrapper.new")) {
+		error("chmod $wrapper.new: $!");
 	}
-	print "successfully generated $wrapper\n";
-} #}}}
+	if (! rename("$wrapper.new", $wrapper)) {
+		error("rename $wrapper.new $wrapper: $!");
+	}
+	#translators: The parameter is a filename.
+	printf(gettext("successfully generated %s"), $wrapper);
+	print "\n";
+}
 
 1