X-Git-Url: https://sipb.mit.edu/gitweb.cgi/ikiwiki.git/blobdiff_plain/cb80809aec56e1b6f0194f3d6f778fc8db3c7783..5d3998555ffbeb1c20b84dd4cdc46c825c07bec8:/IkiWiki/Wrapper.pm diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm index 6687cace2..84cc7540b 100644 --- a/IkiWiki/Wrapper.pm +++ b/IkiWiki/Wrapper.pm @@ -1,17 +1,37 @@ #!/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_wrappers () { + debug(gettext("generating wrappers..")); + my %origconfig=(%config); + foreach my $wrapper (@{$config{wrappers}}) { + %config=(%origconfig, %{$wrapper}); + $config{verbose}=$config{setupverbose} + if exists $config{setupverbose}; + $config{syslog}=$config{setupsyslog} + if exists $config{setupsyslog}; + delete @config{qw(setupsyslog setupverbose wrappers genwrappers rebuild)}; + checkconfig(); + if (! $config{cgi} && ! $config{post_commit} && + ! $config{test_receive}) { + $config{post_commit}=1; + } + gen_wrapper(); + } + %config=(%origconfig); +} -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)); } @@ -28,53 +48,91 @@ 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 + HTTP_HOST SERVER_PORT HTTPS + REDIRECT_URL} if $config{cgi}; my $envsave=""; foreach my $var (@envsave) { - $envsave.=<<"EOF" + $envsave.=<<"EOF"; if ((s=getenv("$var"))) 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) - addenv("REV", argv[2]); - else if ((s=getenv("REV"))) - addenv("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}) { - $envsave.=<<"EOF" - if ((s=getenv("ARCH_VERSION"))) - addenv("ARCH_VERSION", s); + elsif ($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. + $pre_exec=<<"EOF"; + lockfd=open("$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; $configstring=~s/\n/\\n/g; - #translators: The first parameter is a filename, and the second is - #translators: a (probably not translated) error message. - open(OUT, ">$wrapper.c") || error(sprintf(gettext("failed to write %s: %s"), "$wrapper.c", $!));; - print OUT <<"EOF"; + writefile(basename("$wrapper.c"), dirname($wrapper), <<"EOF"); /* A wrapper for ikiwiki, can be safely made suid. */ #include #include +#include +#include #include #include #include +#include extern char **environ; -char *newenviron[$#envsave+5]; +char *newenviron[$#envsave+7]; int i=0; -addenv(char *var, char *val) { +void addenv(char *var, char *val) { char *s=malloc(strlen(var)+1+strlen(val)+1); if (!s) perror("malloc"); @@ -83,26 +141,81 @@ addenv(char *var, char *val) { } int main (int argc, char **argv) { - /* Sanitize environment. */ + int lockfd=-1; char *s; + +$check_commit_hook +@wrapper_hooks $envsave newenviron[i++]="HOME=$ENV{HOME}"; + newenviron[i++]="PATH=$ENV{PATH}"; newenviron[i++]="WRAPPED_OPTIONS=$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); + } + +$pre_exec - if (setregid(getegid(), -1) != 0 || setreuid(geteuid(), -1) != 0) { - perror("failed to drop real uid/gid"); +$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("exec $this"); exit(1); +#endif } EOF - close OUT; - if (system("gcc", "$wrapper.c", "-o", "$wrapper.new") != 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")); } @@ -126,6 +239,6 @@ EOF #translators: The parameter is a filename. printf(gettext("successfully generated %s"), $wrapper); print "\n"; -} #}}} +} 1