X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/b645dc5a4118feabd37d95fabbc6aaa803e3c45f..6d33160faf0d5bbe8f405b60f32893607a534d4c:/IkiWiki/Wrapper.pm diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm index 62d284eb6..bd134c9a3 100644 --- a/IkiWiki/Wrapper.pm +++ b/IkiWiki/Wrapper.pm @@ -1,80 +1,222 @@ #!/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 } - $Data::Dumper::Indent=0; + 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. + $pre_exec=<<"EOF"; + lockfd=open("$config{wikistatedir}/cgilock", O_CREAT | O_RDWR, 0666); + if (lockfd != -1 && flock(lockfd, LOCK_EX) == 0) { + char *fd_s=malloc(8); + sprintf(fd_s, "%i", lockfd); + setenv("IKIWIKI_CGILOCK_FD", fd_s, 1); + } +EOF + } + + my $set_background_command=''; + if (defined $config{wrapper_background_command} && + length $config{wrapper_background_command}) { + my $background_command=delete $config{wrapper_background_command}; + $set_background_command=~s/"/\\"/g; + $set_background_command='#define BACKGROUND_COMMAND "'.$background_command.'"'; + } + + $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($wrapper), <<"EOF"); /* A wrapper for ikiwiki, can be safely made suid. */ -#define _GNU_SOURCE #include +#include +#include +#include #include #include #include +#include extern char **environ; +char *newenviron[$#envsave+6]; +int i=0; + +void 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. */ + int lockfd=-1; char *s; - char *newenviron[$#envsave+4]; - int i=0; + +$check_commit_hook +@wrapper_hooks $envsave newenviron[i++]="HOME=$ENV{HOME}"; newenviron[i++]="WRAPPED_OPTIONS=$configstring"; + +#ifdef __TINYC__ + /* old tcc versions do not support modifying environ directly */ + if (clearenv() != 0) { + perror("clearenv"); + exit(1); + } + for (; i>0; i--) + putenv(newenviron[i-1]); +#else newenviron[i]=NULL; environ=newenviron; +#endif + + if (setregid(getegid(), -1) != 0 && + setregid(getegid(), -1) != 0) { + perror("failed to drop real gid"); + exit(1); + } + if (setreuid(geteuid(), -1) != 0 && + setreuid(geteuid(), -1) != 0) { + perror("failed to drop real uid"); + exit(1); + } + +$pre_exec + +$set_background_command +#ifdef BACKGROUND_COMMAND + if (lockfd != -1) { + close(lockfd); + } + pid_t pid=fork(); + if (pid == -1) { + perror("fork"); + exit(1); + } + else if (pid == 0) { + execl("$this", "$this", NULL); + perror("exec $this"); + exit(1); + } + else { + waitpid(pid, NULL, 0); + + if (daemon(1, 0) == 0) { + system(BACKGROUND_COMMAND); + exit(0); + } + else { + perror("daemon"); + exit(1); + } + } +#else execl("$this", "$this", NULL); - perror("failed to run $this"); + perror("exec $this"); exit(1); +#endif } 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