X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/7ddea03684df47c861c264216b83e7653d6784fd..1d3b2674c87c9cac395228dac9b60c751d4e06a1:/IkiWiki/Wrapper.pm diff --git a/IkiWiki/Wrapper.pm b/IkiWiki/Wrapper.pm index fd8a0e5b0..b46bc6aa9 100644 --- a/IkiWiki/Wrapper.pm +++ b/IkiWiki/Wrapper.pm @@ -8,10 +8,31 @@ use File::Spec; use Data::Dumper; use IkiWiki; -sub gen_wrapper () { #{{{ +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); +} + +our $program_to_wrap = $0; +sub gen_wrapper () { $config{srcdir}=File::Spec->rel2abs($config{srcdir}); $config{destdir}=File::Spec->rel2abs($config{destdir}); - my $this=File::Spec->rel2abs($0); + my $this=File::Spec->rel2abs($program_to_wrap); if (! -x $this) { error(sprintf(gettext("%s doesn't seem to be executable"), $this)); } @@ -28,19 +49,108 @@ 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 HTTPS} if $config{cgi}; + HTTP_COOKIE REMOTE_USER HTTPS REDIRECT_STATUS + HTTP_HOST SERVER_PORT HTTPS HTTP_ACCEPT + REDIRECT_URL} if $config{cgi}; my $envsave=""; foreach my $var (@envsave) { - $envsave.=<<"EOF" + $envsave.=<<"EOF"; if ((s=getenv("$var"))) 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. + # + # A lot of cgi wrapper processes can potentially build + # up and clog an otherwise unloaded web server. To + # partially avoid this, when a GET comes in and the lock + # is already held, rather than blocking a html page is + # constructed that retries. This is enabled by setting + # cgi_overload_delay. + if (defined $config{cgi_overload_delay} && + $config{cgi_overload_delay} =~/^[0-9]+/) { + my $i=int($config{cgi_overload_delay}); + $pre_exec.="#define CGI_OVERLOAD_DELAY $i\n" + if $i > 0; + my $msg=gettext("Please wait"); + $msg=~s/"/\\"/g; + $pre_exec.='#define CGI_PLEASE_WAIT_TITLE "'.$msg."\"\n"; + if (defined $config{cgi_overload_message} && length $config{cgi_overload_message}) { + $msg=$config{cgi_overload_message}; + $msg=~s/"/\\"/g; + } + $pre_exec.='#define CGI_PLEASE_WAIT_BODY "'.$msg."\"\n"; + } + $pre_exec.=<<"EOF"; + lockfd=open("$config{wikistatedir}/cgilock", O_CREAT | O_RDWR, 0666); + if (lockfd != -1) { +#ifdef CGI_OVERLOAD_DELAY + char *request_method = getenv("REQUEST_METHOD"); + if (request_method && strcmp(request_method, "GET") == 0) { + if (lockf(lockfd, F_TLOCK, 0) == 0) { + set_cgilock_fd(lockfd); + } + else { + printf("Content-Type: text/html\\nRefresh: %i; URL=%s\\n\\n%s

%s

", + CGI_OVERLOAD_DELAY, + getenv("REQUEST_URI"), + CGI_PLEASE_WAIT_TITLE, + CGI_PLEASE_WAIT_BODY); + exit(0); + } + } + else if (lockf(lockfd, F_LOCK, 0) == 0) { + set_cgilock_fd(lockfd); + } +#else + if (lockf(lockfd, F_LOCK, 0) == 0) { + set_cgilock_fd(lockfd); + } +#endif + } +EOF + } - my $test_receive=""; - if ($config{test_receive}) { - require IkiWiki::Receive; - $test_receive=IkiWiki::Receive::gen_wrapper(); + 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 @@ -49,22 +159,22 @@ EOF $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+6]; +char *newenviron[$#envsave+7]; int i=0; -addenv(char *var, char *val) { +void addenv(char *var, char *val) { char *s=malloc(strlen(var)+1+strlen(val)+1); if (!s) perror("malloc"); @@ -72,15 +182,35 @@ addenv(char *var, char *val) { newenviron[i++]=s; } +void set_cgilock_fd (int lockfd) { + char *fd_s=malloc(8); + sprintf(fd_s, "%i", lockfd); + setenv("IKIWIKI_CGILOCK_FD", fd_s, 1); +} + int main (int argc, char **argv) { + int lockfd=-1; char *s; -$test_receive +$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) { @@ -93,15 +223,47 @@ $envsave exit(1); } +$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("exec $this"); exit(1); +#endif } EOF - close OUT; - my $cc=exists $ENV{CC} ? possibly_foolish_untaint($ENV{CC}) : 'cc'; - if (system($cc, "$wrapper.c", "-o", "$wrapper.new") != 0) { + my @cc=exists $ENV{CC} ? possibly_foolish_untaint($ENV{CC}) : 'cc'; + push @cc, split(' ', 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")); } @@ -123,8 +285,7 @@ EOF error("rename $wrapper.new $wrapper: $!"); } #translators: The parameter is a filename. - printf(gettext("successfully generated %s"), $wrapper); - print "\n"; -} #}}} + debug(sprintf(gettext("successfully generated %s"), $wrapper)); +} 1