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rpm/lib/rpmscript.c

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#include "system.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <unistd.h>
#include <rpm/rpmfileutil.h>
#include <rpm/rpmmacro.h>
#include <rpm/rpmio.h>
#include <rpm/rpmlog.h>
#include <rpm/header.h>
#include "rpmio/rpmlua.h"
#include "lib/rpmscript.h"
#include "lib/rpmplugins.h" /* rpm plugins hooks */
#include "debug.h"
struct rpmScript_s {
rpmTagVal tag; /* script tag */
char **args; /* scriptlet call arguments */
char *body; /* script body */
char *descr; /* description for logging */
rpmscriptFlags flags; /* flags to control operation */
};
/**
* Run internal Lua script.
*/
static rpmRC runLuaScript(rpmPlugins plugins, int selinux, ARGV_const_t prefixes,
const char *sname, rpmlogLvl lvl, FD_t scriptFd,
ARGV_t * argvp, const char *script, int arg1, int arg2)
{
rpmRC rc = RPMRC_FAIL;
#ifdef WITH_LUA
ARGV_t argv = argvp ? *argvp : NULL;
rpmlua lua = NULL; /* Global state. */
rpmluav var = rpmluavNew();
int cwd = -1;
rpmlog(RPMLOG_DEBUG, "%s: running <lua> scriptlet.\n", sname);
/* Create arg variable */
rpmluaPushTable(lua, "arg");
rpmluavSetListMode(var, 1);
if (argv) {
char **p;
for (p = argv; *p; p++) {
rpmluavSetValue(var, RPMLUAV_STRING, *p);
rpmluaSetVar(lua, var);
}
}
if (arg1 >= 0) {
rpmluavSetValueNum(var, arg1);
rpmluaSetVar(lua, var);
}
if (arg2 >= 0) {
rpmluavSetValueNum(var, arg2);
rpmluaSetVar(lua, var);
}
rpmluaPop(lua);
/* Lua scripts can change our cwd and umask, save and restore */
/* XXX TODO: use cwd from chroot state to save unnecessary open here */
cwd = open(".", O_RDONLY);
if (cwd != -1) {
mode_t oldmask = umask(0);
umask(oldmask);
if (chdir("/") == 0 && rpmluaRunScript(lua, script, sname) == 0) {
rc = RPMRC_OK;
}
/* This failing would be fatal, return something different for it... */
if (fchdir(cwd)) {
rpmlog(RPMLOG_ERR, _("Unable to restore current directory: %m"));
rc = RPMRC_NOTFOUND;
}
close(cwd);
umask(oldmask);
}
rpmluaDelVar(lua, "arg");
rpmluavFree(var);
#else
rpmlog(lvl, _("<lua> scriptlet support not built in\n"));
#endif
return rc;
}
static const char * const SCRIPT_PATH = "PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin";
static void doScriptExec(int selinux, ARGV_const_t argv, ARGV_const_t prefixes,
FD_t scriptFd, FD_t out)
{
int pipes[2];
int flag;
int fdno;
int xx;
int open_max;
(void) signal(SIGPIPE, SIG_DFL);
pipes[0] = pipes[1] = 0;
/* make stdin inaccessible */
xx = pipe(pipes);
xx = close(pipes[1]);
xx = dup2(pipes[0], STDIN_FILENO);
xx = close(pipes[0]);
/* XXX Force FD_CLOEXEC on all inherited fdno's. */
open_max = sysconf(_SC_OPEN_MAX);
if (open_max == -1) {
open_max = 1024;
}
for (fdno = 3; fdno < open_max; fdno++) {
flag = fcntl(fdno, F_GETFD);
if (flag == -1 || (flag & FD_CLOEXEC))
continue;
xx = fcntl(fdno, F_SETFD, FD_CLOEXEC);
/* XXX W2DO? debug msg for inheirited fdno w/o FD_CLOEXEC */
}
if (scriptFd != NULL) {
int sfdno = Fileno(scriptFd);
int ofdno = Fileno(out);
if (sfdno != STDERR_FILENO)
xx = dup2(sfdno, STDERR_FILENO);
if (ofdno != STDOUT_FILENO)
xx = dup2(ofdno, STDOUT_FILENO);
/* make sure we don't close stdin/stderr/stdout by mistake! */
if (ofdno > STDERR_FILENO && ofdno != sfdno)
xx = Fclose (out);
if (sfdno > STDERR_FILENO && ofdno != sfdno)
xx = Fclose (scriptFd);
}
{ char *ipath = rpmExpand("%{_install_script_path}", NULL);
const char *path = SCRIPT_PATH;
if (ipath && ipath[5] != '%')
path = ipath;
xx = setenv("PATH", path, 1);
free(ipath);
}
for (ARGV_const_t pf = prefixes; pf && *pf; pf++) {
char *name = NULL;
int num = (pf - prefixes);
rasprintf(&name, "RPM_INSTALL_PREFIX%d", num);
setenv(name, *pf, 1);
free(name);
/* scripts might still be using the old style prefix */
if (num == 0) {
setenv("RPM_INSTALL_PREFIX", *pf, 1);
}
}
if (chdir("/") == 0) {
/* XXX Don't mtrace into children. */
unsetenv("MALLOC_CHECK_");
/* Permit libselinux to do the scriptlet exec. */
if (selinux == 1) {
xx = rpm_execcon(0, argv[0], argv, environ);
}
if (xx == 0) {
xx = execv(argv[0], argv);
}
}
_exit(127); /* exit 127 for compatibility with bash(1) */
}
static char * writeScript(const char *cmd, const char *script)
{
char *fn = NULL;
size_t slen = strlen(script);
int ok = 0;
FD_t fd = rpmMkTempFile("/", &fn);
if (Ferror(fd))
goto exit;
if (rpmIsDebug() && (rstreq(cmd, "/bin/sh") || rstreq(cmd, "/bin/bash"))) {
static const char set_x[] = "set -x\n";
/* Assume failures will be caught by the write below */
Fwrite(set_x, sizeof(set_x[0]), sizeof(set_x)-1, fd);
}
ok = (Fwrite(script, sizeof(script[0]), slen, fd) == slen);
exit:
if (!ok) fn = _free(fn);
Fclose(fd);
return fn;
}
/**
* Run an external script.
*/
static rpmRC runExtScript(rpmPlugins plugins, int selinux, ARGV_const_t prefixes,
const char *sname, rpmlogLvl lvl, FD_t scriptFd,
ARGV_t * argvp, const char *script, int arg1, int arg2)
{
FD_t out = NULL;
char * fn = NULL;
pid_t pid, reaped;
int status;
rpmRC rc = RPMRC_FAIL;
rpmlog(RPMLOG_DEBUG, "%s: scriptlet start\n", sname);
if (script) {
fn = writeScript(*argvp[0], script);
if (fn == NULL) {
rpmlog(RPMLOG_ERR,
_("Couldn't create temporary file for %s: %s\n"),
sname, strerror(errno));
goto exit;
}
argvAdd(argvp, fn);
if (arg1 >= 0) {
argvAddNum(argvp, arg1);
}
if (arg2 >= 0) {
argvAddNum(argvp, arg2);
}
}
if (scriptFd != NULL) {
if (rpmIsVerbose()) {
out = fdDup(Fileno(scriptFd));
} else {
out = Fopen("/dev/null", "w.fdio");
if (Ferror(out)) {
out = fdDup(Fileno(scriptFd));
}
}
} else {
out = fdDup(STDOUT_FILENO);
}
if (out == NULL) {
rpmlog(RPMLOG_ERR, _("Couldn't duplicate file descriptor: %s: %s\n"),
sname, strerror(errno));
goto exit;
}
pid = fork();
if (pid == (pid_t) -1) {
rpmlog(RPMLOG_ERR, _("Couldn't fork %s: %s\n"),
sname, strerror(errno));
goto exit;
} else if (pid == 0) {/* Child */
rpmlog(RPMLOG_DEBUG, "%s: execv(%s) pid %d\n",
sname, *argvp[0], (unsigned)getpid());
/* Run scriptlet post fork hook for all plugins */
if (rpmpluginsCallScriptletForkPost(plugins, *argvp[0], RPMSCRIPTLET_FORK | RPMSCRIPTLET_EXEC) != RPMRC_FAIL) {
doScriptExec(selinux, *argvp, prefixes, scriptFd, out);
} else {
_exit(126); /* exit 126 for compatibility with bash(1) */
}
}
do {
reaped = waitpid(pid, &status, 0);
} while (reaped == -1 && errno == EINTR);
rpmlog(RPMLOG_DEBUG, "%s: waitpid(%d) rc %d status %x\n",
sname, (unsigned)pid, (unsigned)reaped, status);
if (reaped < 0) {
rpmlog(lvl, _("%s scriptlet failed, waitpid(%d) rc %d: %s\n"),
sname, pid, reaped, strerror(errno));
} else if (!WIFEXITED(status) || WEXITSTATUS(status)) {
if (WIFSIGNALED(status)) {
rpmlog(lvl, _("%s scriptlet failed, signal %d\n"),
sname, WTERMSIG(status));
} else {
rpmlog(lvl, _("%s scriptlet failed, exit status %d\n"),
sname, WEXITSTATUS(status));
}
} else {
/* if we get this far we're clear */
rc = RPMRC_OK;
}
exit:
if (out)
Fclose(out); /* XXX dup'd STDOUT_FILENO */
if (fn) {
if (!rpmIsDebug())
unlink(fn);
free(fn);
}
return rc;
}
rpmRC rpmScriptRun(rpmScript script, int arg1, int arg2, FD_t scriptFd,
ARGV_const_t prefixes, int warn_only, int selinux, rpmPlugins plugins)
{
ARGV_t args = NULL;
rpmlogLvl lvl = warn_only ? RPMLOG_WARNING : RPMLOG_ERR;
rpmRC rc;
int script_type = RPMSCRIPTLET_FORK | RPMSCRIPTLET_EXEC;
if (script == NULL) return RPMRC_OK;
/* construct a new argv as we can't modify the one from header */
if (script->args) {
argvAppend(&args, script->args);
} else {
argvAdd(&args, "/bin/sh");
}
if (rstreq(args[0], "<lua>"))
script_type = RPMSCRIPTLET_NONE;
/* Run scriptlet pre hook for all plugins */
rc = rpmpluginsCallScriptletPre(plugins, script->descr, script_type);
if (rc != RPMRC_FAIL) {
if (script_type & RPMSCRIPTLET_EXEC) {
rc = runExtScript(plugins, selinux, prefixes, script->descr, lvl, scriptFd, &args, script->body, arg1, arg2);
} else {
rc = runLuaScript(plugins, selinux, prefixes, script->descr, lvl, scriptFd, &args, script->body, arg1, arg2);
}
}
/* Run scriptlet post hook for all plugins */
rpmpluginsCallScriptletPost(plugins, script->descr, script_type, rc);
argvFree(args);
return rc;
}
static rpmTagVal getProgTag(rpmTagVal scriptTag)
{
switch (scriptTag) {
case RPMTAG_PREIN: return RPMTAG_PREINPROG;
case RPMTAG_POSTIN: return RPMTAG_POSTINPROG;
case RPMTAG_PREUN: return RPMTAG_PREUNPROG;
case RPMTAG_POSTUN: return RPMTAG_POSTUNPROG;
case RPMTAG_PRETRANS: return RPMTAG_PRETRANSPROG;
case RPMTAG_POSTTRANS: return RPMTAG_POSTTRANSPROG;
case RPMTAG_VERIFYSCRIPT: return RPMTAG_VERIFYSCRIPTPROG;
default: return RPMTAG_NOT_FOUND;
}
}
static rpmTagVal getFlagTag(rpmTagVal scriptTag)
{
switch (scriptTag) {
case RPMTAG_PRETRANS: return RPMTAG_PRETRANSFLAGS;
case RPMTAG_POSTTRANS: return RPMTAG_POSTTRANSFLAGS;
case RPMTAG_PREUN: return RPMTAG_PREUNFLAGS;
case RPMTAG_POSTUN: return RPMTAG_POSTUNFLAGS;
case RPMTAG_PREIN: return RPMTAG_PREINFLAGS;
case RPMTAG_POSTIN: return RPMTAG_POSTINFLAGS;
case RPMTAG_VERIFYSCRIPT: return RPMTAG_VERIFYSCRIPTFLAGS;
case RPMTAG_TRIGGERSCRIPTS: return RPMTAG_TRIGGERSCRIPTFLAGS;
default:
break;
}
return RPMTAG_NOT_FOUND;
}
static const char * tag2sln(rpmTagVal tag)
{
switch (tag) {
case RPMTAG_PRETRANS: return "%pretrans";
case RPMTAG_TRIGGERPREIN: return "%triggerprein";
case RPMTAG_PREIN: return "%pre";
case RPMTAG_POSTIN: return "%post";
case RPMTAG_TRIGGERIN: return "%triggerin";
case RPMTAG_TRIGGERUN: return "%triggerun";
case RPMTAG_PREUN: return "%preun";
case RPMTAG_POSTUN: return "%postun";
case RPMTAG_POSTTRANS: return "%posttrans";
case RPMTAG_TRIGGERPOSTUN: return "%triggerpostun";
case RPMTAG_VERIFYSCRIPT: return "%verify";
default: break;
}
return "%unknownscript";
}
static rpmScript rpmScriptNew(Header h, rpmTagVal tag, const char *body,
rpmscriptFlags flags)
{
char *nevra = headerGetAsString(h, RPMTAG_NEVRA);
rpmScript script = xcalloc(1, sizeof(*script));
script->tag = tag;
script->flags = flags;
script->body = (body != NULL) ? xstrdup(body) : NULL;
rasprintf(&script->descr, "%s(%s)", tag2sln(tag), nevra);
/* macros need to be expanded before possible queryformat */
if (script->body && (script->flags & RPMSCRIPT_FLAG_EXPAND)) {
char *body = rpmExpand(script->body, NULL);
free(script->body);
script->body = body;
}
if (script->body && (script->flags & RPMSCRIPT_FLAG_QFORMAT)) {
/* XXX TODO: handle queryformat errors */
char *body = headerFormat(h, script->body, NULL);
free(script->body);
script->body = body;
}
free(nevra);
return script;
}
rpmScript rpmScriptFromTriggerTag(Header h, rpmTagVal triggerTag, uint32_t ix)
{
rpmScript script = NULL;
struct rpmtd_s tscripts, tprogs, tflags;
headerGetFlags hgflags = HEADERGET_MINMEM;
headerGet(h, RPMTAG_TRIGGERSCRIPTS, &tscripts, hgflags);
headerGet(h, RPMTAG_TRIGGERSCRIPTPROG, &tprogs, hgflags);
headerGet(h, RPMTAG_TRIGGERSCRIPTFLAGS, &tflags, hgflags);
if (rpmtdSetIndex(&tscripts, ix) >= 0 && rpmtdSetIndex(&tprogs, ix) >= 0) {
rpmscriptFlags sflags = 0;
const char *prog = rpmtdGetString(&tprogs);
if (rpmtdSetIndex(&tflags, ix) >= 0)
sflags = rpmtdGetNumber(&tflags);
script = rpmScriptNew(h, triggerTag, rpmtdGetString(&tscripts), sflags);
/* hack up a hge-style NULL-terminated array */
script->args = xmalloc(2 * sizeof(*script->args) + strlen(prog) + 1);
script->args[0] = (char *)(script->args + 2);
script->args[1] = NULL;
strcpy(script->args[0], prog);
}
rpmtdFreeData(&tscripts);
rpmtdFreeData(&tprogs);
rpmtdFreeData(&tflags);
return script;
}
rpmScript rpmScriptFromTag(Header h, rpmTagVal scriptTag)
{
rpmScript script = NULL;
rpmTagVal progTag = getProgTag(scriptTag);
if (headerIsEntry(h, scriptTag) || headerIsEntry(h, progTag)) {
struct rpmtd_s prog;
script = rpmScriptNew(h, scriptTag,
headerGetString(h, scriptTag),
headerGetNumber(h, getFlagTag(scriptTag)));
if (headerGet(h, progTag, &prog, (HEADERGET_ALLOC|HEADERGET_ARGV))) {
script->args = prog.data;
}
}
return script;
}
rpmScript rpmScriptFree(rpmScript script)
{
if (script) {
free(script->args);
free(script->body);
free(script->descr);
free(script);
}
return NULL;
}
rpmTagVal rpmScriptTag(rpmScript script)
{
return (script != NULL) ? script->tag : RPMTAG_NOT_FOUND;
}
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