X-Git-Url: https://sipb.mit.edu/gitweb.cgi/ikiwiki.git/blobdiff_plain/605e91c595b431d4785b743e34a0ad356e8b5554..dc128dd829bfd08dba5d6929956d9064e7d37b81:/IkiWiki/Wrapper.pm diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm index ca7304c21..f175b4a0b 100644 --- a/IkiWiki/Wrapper.pm +++ b/IkiWiki/Wrapper.pm @@ -1,17 +1,17 @@ #!/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(sprintf(gettext("%s doesn't seem to be executable"), $this)); } @@ -28,84 +28,150 @@ sub gen_wrapper () { #{{{ my @envsave; push @envsave, qw{REMOTE_ADDR QUERY_STRING REQUEST_METHOD REQUEST_URI CONTENT_TYPE CONTENT_LENGTH GATEWAY_INTERFACE - HTTP_COOKIE REMOTE_USER} 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 } - if ($config{rcs} eq "svn" && $config{notify}) { - # Support running directly as hooks/post-commit by passing - # $2 in REV in the environment. - $envsave.=<<"EOF" - if (argc == 3) - asprintf(&newenviron[i++], "REV=%s", argv[2]); - else if ((s=getenv("REV"))) - asprintf(&newenviron[i++], "%s=%s", "REV", s); + + 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 } - if ($config{rcs} eq "tla" && $config{notify}) { - $envsave.=<<"EOF" - if ((s=getenv("ARCH_VERSION"))) - asprintf(&newenviron[i++], "%s=%s", "ARCH_VERSION", s); + elsif ($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=malloc(8); + sprintf(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; + $configstring=~s/\n/\\n/g; - #translators: The first parameter is a filename, and the second is - #translators: a (probably not translated) error message. - open(OUT, ">$wrapper.c") || error(sprintf(gettext("failed to write %s: %s"), "$wrapper.c", $!));; - print OUT <<"EOF"; + writefile(basename("$wrapper.c"), dirname($wrapper), <<"EOF"); /* A wrapper for ikiwiki, can be safely made suid. */ -#define _GNU_SOURCE #include #include +#include +#include #include #include #include +#include + +char *newenviron[$#envsave+6]; +int i=0; -extern char **environ; +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. */ char *s; - char *newenviron[$#envsave+5]; - int i=0; + +$check_commit_hook +@wrapper_hooks $envsave newenviron[i++]="HOME=$ENV{HOME}"; newenviron[i++]="WRAPPED_OPTIONS=$configstring"; - newenviron[i]=NULL; - environ=newenviron; - if (setregid(getegid(), -1) != 0 || setreuid(geteuid(), -1) != 0) { - perror("failed to drop real uid/gid"); + if (clearenv() != 0) { + perror("clearenv"); exit(1); } + for (; i>0; i--) + putenv(newenviron[i-1]); + if (setregid(getegid(), -1) != 0 && + setregid(getegid(), -1) != 0) { + perror("failed to drop real gid"); + exit(1); + } + if (setreuid(geteuid(), -1) != 0 && + setreuid(geteuid(), -1) != 0) { + perror("failed to drop real uid"); + exit(1); + } + +$pre_exec execl("$this", "$this", NULL); - perror("failed to run $this"); + perror("exec $this"); exit(1); } EOF - close OUT; - if (system("gcc", "$wrapper.c", "-o", $wrapper) != 0) { + + 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: $!"); + } + } if (defined $config{wrappermode} && - ! chmod(oct($config{wrappermode}), $wrapper)) { - error("chmod $wrapper: $!"); + ! chmod(oct($config{wrappermode}), "$wrapper.new")) { + error("chmod $wrapper.new: $!"); + } + if (! rename("$wrapper.new", $wrapper)) { + error("rename $wrapper.new $wrapper: $!"); } #translators: The parameter is a filename. - printf(gettext("successfully generated %s"), $wrapper)."\n"; -} #}}} + printf(gettext("successfully generated %s"), $wrapper); + print "\n"; +} 1