#!/usr/bin/perl
+package IkiWiki;
+
use warnings;
use strict;
+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 () { #{{{
- eval q{use Cwd 'abs_path'};
- $config{srcdir}=abs_path($config{srcdir});
- $config{destdir}=abs_path($config{destdir});
- my $this=abs_path($0);
+our $program_to_wrap = $0;
+sub gen_wrapper () {
+ $config{srcdir}=File::Spec->rel2abs($config{srcdir});
+ $config{destdir}=File::Spec->rel2abs($config{destdir});
+ my $this=File::Spec->rel2abs($program_to_wrap);
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 @params=($config{srcdir}, $config{destdir},
- "--wikiname=$config{wikiname}",
- "--templatedir=$config{templatedir}");
- push @params, "--verbose" if $config{verbose};
- push @params, "--rebuild" if $config{rebuild};
- push @params, "--nosvn" if !$config{svn};
- push @params, "--cgi" if $config{cgi};
- push @params, "--url=$config{url}" if length $config{url};
- push @params, "--cgiurl=$config{cgiurl}" if length $config{cgiurl};
- push @params, "--historyurl=$config{historyurl}" if length $config{historyurl};
- push @params, "--diffurl=$config{diffurl}" if length $config{diffurl};
- push @params, "--anonok" if $config{anonok};
- push @params, "--adminuser=$_" foreach @{$config{adminuser}};
- my $params=join(" ", @params);
- my $call='';
- foreach my $p ($this, $this, @params) {
- $call.=qq{"$p", };
- }
- $call.="NULL";
+ 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
+ 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")))
- asprintf(&newenviron[i++], "%s=%s", "$var", s);
+ addenv("$var", s);
+EOF
+ }
+ if (ref $config{ENV} eq 'HASH') {
+ foreach my $key (keys %{$config{ENV}}) {
+ my $val=$config{ENV}{$key};
+ utf8::encode($val) if utf8::is_utf8($val);
+ $val =~ s/([^A-Za-z0-9])/sprintf '""\\x%02x""', ord($1)/ge;
+ $envsave.=<<"EOF";
+ addenv("$key", "$val");
+EOF
+ }
+ delete $config{ENV};
+ }
+
+ 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<html><head><title>%s</title><head><body><p>%s</p></body></html>",
+ 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 $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($wrapper), <<"EOF");
/* A wrapper for ikiwiki, can be safely made suid. */
-#define _GNU_SOURCE
#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
+#include <sys/file.h>
extern char **environ;
+int newenvironlen=0;
+/* Array of length newenvironlen+1 (+1 for NULL) */
+char **newenviron=NULL;
+
+void addenv(char *var, char *val) {
+ char *s;
+
+ if (newenviron) {
+ newenviron=realloc(newenviron, (newenvironlen+2) * sizeof(char *));
+ }
+ else {
+ newenviron=calloc(newenvironlen+2, sizeof(char *));
+ }
+
+ if (!newenviron) {
+ perror("realloc");
+ exit(1);
+ }
+
+ s=malloc(strlen(var)+1+strlen(val)+1);
+ if (!s) {
+ perror("malloc");
+ exit(1);
+ }
+ else {
+ sprintf(s, "%s=%s", var, val);
+ newenviron[newenvironlen++]=s;
+ }
+}
+
+void set_cgilock_fd (int lockfd) {
+ char fd_s[12];
+ sprintf(fd_s, "%i", lockfd);
+ if (setenv("IKIWIKI_CGILOCK_FD", fd_s, 1) != 0) {
+ perror("setenv");
+ exit(1);
+ }
+}
int main (int argc, char **argv) {
- /* Sanitize environment. */
+ int lockfd=-1;
char *s;
- char *newenviron[$#envsave+3];
- int i=0;
+
+$check_commit_hook
+@wrapper_hooks
$envsave
- newenviron[i++]="HOME=$ENV{HOME}";
- newenviron[i]=NULL;
+ addenv("HOME", "$ENV{HOME}");
+ addenv("PATH", "$ENV{PATH}");
+ addenv("WRAPPED_OPTIONS", "$configstring");
+
+#ifdef __TINYC__
+ /* old tcc versions do not support modifying environ directly */
+ if (clearenv() != 0) {
+ perror("clearenv");
+ exit(1);
+ }
+ for (; newenvironlen>0; newenvironlen--)
+ putenv(newenviron[newenvironlen-1]);
+#else
+ newenviron[newenvironlen]=NULL;
environ=newenviron;
+#endif
- if (argc == 2 && strcmp(argv[1], "--params") == 0) {
- printf("$params\\n");
- exit(0);
+ if (setregid(getegid(), -1) != 0 &&
+ setregid(getegid(), -1) != 0) {
+ perror("failed to drop real gid");
+ exit(1);
}
-
- execl($call);
- perror("failed to run $this");
+ if (setreuid(geteuid(), -1) != 0 &&
+ setreuid(geteuid(), -1) != 0) {
+ perror("failed to drop real uid");
+ exit(1);
+ }
+
+$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("exec $this");
exit(1);
+#endif
}
EOF
- close OUT;
- if (system("gcc", "ikiwiki-wrap.c", "-o", possibly_foolish_untaint($config{wrapper})) != 0) {
- error("failed to compile ikiwiki-wrap.c");
+
+ 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"));
+ }
+ 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}), possibly_foolish_untaint($config{wrapper}))) {
- error("chmod $config{wrapper}: $!");
+ ! chmod(oct($config{wrappermode}), "$wrapper.new")) {
+ error("chmod $wrapper.new: $!");
+ }
+ if (! rename("$wrapper.new", $wrapper)) {
+ error("rename $wrapper.new $wrapper: $!");
}
- print "successfully generated $config{wrapper}\n";
-} #}}}
+ #translators: The parameter is a filename.
+ debug(sprintf(gettext("successfully generated %s"), $wrapper));
+}
1