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leveldb.c
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leveldb.c
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/* Copyright 1997-2008 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <alloca.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <glob.h>
#include <libgen.h>
#include <libintl.h>
#include <locale.h>
#include <selinux/label.h>
#include <selinux/selinux.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
/* Changes
1998-09-22 - Arnaldo Carvalho de Melo <[email protected]>
i18n for init.d scripts (eg.: description(pt_BR) is a brazilian
portuguese description for the package)
*/
#define _(String) gettext((String))
#include "leveldb.h"
int selinux_restore(const char *name) {
struct selabel_handle *hnd = NULL;
struct stat buf;
char *newcon = NULL;
int r = -1;
hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
if (hnd == NULL)
goto out;
r = stat(name, &buf);
if (r < 0)
goto out;
r = selabel_lookup_raw(hnd, &newcon, name, buf.st_mode);
if (r < 0)
goto out;
r = setfilecon_raw(name, newcon);
if (r < 0)
goto out;
r = 0;
out:
if (hnd)
selabel_close(hnd);
if (newcon)
freecon(newcon);
/* Lets ignore any errors when selinux is disabled.
* We still want to run the previous code though,
* since we only need selinux policy.
* Selinux itself can be turned off.
*/
if (!is_selinux_enabled())
return 0;
return r;
}
int parseLevels(char *str, int emptyOk) {
char *chptr = str;
int rc = 0;
if (!str || !strlen(str))
return emptyOk ? 0 : -1;
while (*chptr) {
if (!isdigit(*chptr) || *chptr > '6')
return -1;
rc |= 1 << (*chptr - '0');
chptr++;
}
return rc;
}
int readDescription(char *start, char *bufstop, char **english_desc,
char **serv_desc) {
char english;
char my_lang_loaded = 0;
char is_my_lang = 0;
char *lang = getenv("LANG");
char *final_parenthesis;
char *end, *next;
int i;
english = *start == ':';
end = strchr(start, '\n');
if (!end)
next = end = bufstop;
else
next = end + 1;
if (!english) {
if (*start != '(') {
return 1;
}
++start;
final_parenthesis = strchr(start, ')');
if (final_parenthesis == NULL || final_parenthesis - start > 5) {
return 1;
}
is_my_lang = lang ? strncmp(lang, start, strlen(lang)) == 0 : 0;
start = final_parenthesis + 2;
} else
++start;
while (isspace(*start) && start < end)
start++;
if (start >= end) {
return 1;
}
{
char *desc = malloc(end - start + 1);
if (!desc)
return 1;
strncpy(desc, start, end - start);
desc[end - start] = '\0';
start = next;
while (desc[strlen(desc) - 1] == '\\') {
desc[strlen(desc) - 1] = '\0';
start = next;
while (isspace(*start) && start < bufstop)
start++;
if (start == bufstop || *start != '#') {
free(desc);
return 1;
}
start++;
while (isspace(*start) && start < bufstop)
start++;
if (start == bufstop) {
free(desc);
return 1;
}
end = strchr(start, '\n');
if (!end)
next = end = bufstop;
else
next = end + 1;
i = strlen(desc);
desc = realloc(desc, i + end - start + 1);
strncat(desc, start, end - start);
desc[i + end - start] = '\0';
start = next;
}
if (desc) {
if (my_lang_loaded) {
free(desc);
} else if (is_my_lang) {
if (*serv_desc)
free(*serv_desc);
*serv_desc = desc;
return 0;
} else if (english) {
if (*serv_desc)
free(*serv_desc);
if (*english_desc)
free(*english_desc);
*english_desc = desc;
} else
free(desc);
}
}
return 0;
}
int readXinetdServiceInfo(char *name, struct service *service) {
char *filename;
int fd;
struct service serv = {
name : NULL,
levels : -1,
kPriority : 100,
sPriority : -1,
desc : NULL,
startDeps : NULL,
stopDeps : NULL,
softStartDeps : NULL,
softStopDeps : NULL,
provides : NULL,
type : TYPE_XINETD,
isLSB : 0,
enabled : -1
};
struct stat sb;
char *buf = NULL, *ptr;
char *eng_desc = NULL, *start;
int r;
r = asprintf(&filename, XINETDDIR "/%s", name);
if (r < 0)
return -1;
fd = open(filename, O_RDONLY);
free(filename);
if(fd < 0)
goto out_err;
fstat(fd, &sb);
if (!S_ISREG(sb.st_mode))
goto out_err;
buf = malloc(sb.st_size + 1);
if (!buf)
goto out_err;
if (read(fd, buf, sb.st_size) != sb.st_size)
goto out_err;
close(fd);
serv.name = strdup(name);
buf[sb.st_size] = '\0';
start = buf;
while (buf) {
ptr = strchr(buf, '\n');
if (*buf == '#') {
buf++;
while (isspace(*buf) && buf < ptr)
buf++;
if (!strncmp(buf, "default:", 9)) {
buf += 8;
while (isspace(*buf))
buf++;
if (!strncmp(buf + 9, "on", 2)) {
serv.enabled = 1;
} else {
serv.enabled = 0;
}
} else if (!strncmp(buf, "description:", 12)) {
buf += 11;
if (readDescription(buf, start + sb.st_size, &serv.desc,
&eng_desc)) {
if (serv.desc)
free(serv.desc);
}
if (!serv.desc) {
if (eng_desc)
serv.desc = eng_desc;
else
serv.desc = strdup(name);
} else if (eng_desc)
free(eng_desc);
}
if (ptr) {
*ptr = '\0';
ptr++;
}
buf = ptr;
continue;
}
while (isspace(*buf) && buf < ptr)
buf++;
if (!strncmp(buf, "disable", 7)) {
buf = strstr(buf, "=");
if (buf)
do {
buf++;
} while (isspace(*buf));
if (buf && strncmp(buf, "yes", 3)) {
serv.levels = parseLevels("0123456", 0);
if (serv.enabled == -1)
serv.enabled = 1;
} else {
serv.levels = 0;
if (serv.enabled == -1)
serv.enabled = 0;
}
}
if (ptr) {
*ptr = '\0';
ptr++;
}
buf = ptr;
}
*service = serv;
free(start);
return 0;
out_err:
if (fd >= 0)
close(fd);
free(buf);
return -1;
}
void freeService(struct service s) {
free(s.name);
free(s.startDeps);
free(s.stopDeps);
free(s.softStartDeps);
free(s.softStopDeps);
free(s.provides);
}
void freeServices(struct service *s, int n) {
for (int i = 0; i < n; i++)
freeService(s[i]);
free(s);
}
int readServices(struct service **services) {
DIR *dir;
struct dirent *ent;
struct stat sb;
struct service *servs = NULL;
int numservs = 0;
char fn[1024];
if (!(dir = opendir(RUNLEVELS "/init.d"))) {
fprintf(stderr, _("failed to open %s/init.d: %s\n"), RUNLEVELS,
strerror(errno));
return -1;
}
while ((ent = readdir(dir))) {
const char *dn;
/* Skip any file starting with a . */
if (ent->d_name[0] == '.')
continue;
/* Skip files with known bad extensions */
if ((dn = strrchr(ent->d_name, '.')) != NULL &&
(!strcmp(dn, ".rpmsave") || !strcmp(dn, ".rpmnew") ||
!strcmp(dn, ".rpmorig") || !strcmp(dn, ".swp")))
continue;
dn = ent->d_name + strlen(ent->d_name) - 1;
if (*dn == '~' || *dn == ',')
continue;
sprintf(fn, RUNLEVELS "/init.d/%s", ent->d_name);
if (stat(fn, &sb)) {
continue;
}
if (!S_ISREG(sb.st_mode))
continue;
servs = realloc(servs, (numservs + 1) * sizeof(struct service));
if (!readServiceInfo(ent->d_name, TYPE_INIT_D, servs + numservs, 0))
numservs++;
}
closedir(dir);
*services = servs;
return numservs;
}
int readServiceInfo(char *name, int type, struct service *service,
int honorHide) {
char *filename = NULL;
int fd;
struct service serv, serv_overrides;
int parseret;
if (!(type & TYPE_INIT_D))
goto try_xinetd;
asprintf(&filename, RUNLEVELS "/init.d/%s", name);
if ((fd = open(filename, O_RDONLY)) < 0)
goto try_xinetd;
free(filename);
parseret = parseServiceInfo(fd, name, &serv, honorHide, 0);
if (parseret)
return parseret;
asprintf(&filename, RUNLEVELS "/chkconfig.d/%s", name);
if ((fd = open(filename, O_RDONLY)) >= 0) {
parseret = parseServiceInfo(fd, name, &serv_overrides, honorHide, 1);
if (parseret >= 0) {
if (serv_overrides.name)
serv.name = serv_overrides.name;
if (serv_overrides.levels != -1)
serv.levels = serv_overrides.levels;
if (serv_overrides.kPriority != -2)
serv.kPriority = serv_overrides.kPriority;
if (serv_overrides.sPriority != -2)
serv.sPriority = serv_overrides.sPriority;
if (serv_overrides.desc)
serv.desc = serv_overrides.desc;
if (serv_overrides.startDeps)
serv.startDeps = serv_overrides.startDeps;
if (serv_overrides.stopDeps)
serv.stopDeps = serv_overrides.stopDeps;
if (serv_overrides.softStartDeps)
serv.softStartDeps = serv_overrides.softStartDeps;
if (serv_overrides.softStopDeps)
serv.softStopDeps = serv_overrides.softStopDeps;
if (serv_overrides.provides)
serv.provides = serv_overrides.provides;
if (serv_overrides.isLSB || serv.isLSB)
serv.isLSB = 1;
}
}
serv.currentLevels = whatLevels(name);
free(filename);
*service = serv;
return 0;
try_xinetd:
free(filename);
if (!(type & TYPE_XINETD))
return -1;
return readXinetdServiceInfo(name, service);
}
int readServiceDifferences(char *name, int type, struct service *service,
struct service *service_overrides, int honorHide) {
char *filename = NULL;
int fd;
struct service serv, serv_overrides;
int parseret;
if (!(type & TYPE_INIT_D))
goto try_xinetd;
asprintf(&filename, RUNLEVELS "/init.d/%s", name);
if ((fd = open(filename, O_RDONLY)) < 0) {
goto try_xinetd;
}
free(filename);
parseret = parseServiceInfo(fd, name, &serv, honorHide, 0);
if (parseret) {
return parseret;
}
asprintf(&filename, RUNLEVELS "/chkconfig.d/%s", name);
if ((fd = open(filename, O_RDONLY)) >= 0) {
parseret = parseServiceInfo(fd, name, &serv_overrides, honorHide, 1);
} else {
parseret = 1;
}
free(filename);
if (parseret) {
return 1;
}
*service = serv;
*service_overrides = serv_overrides;
return 0;
try_xinetd:
free(filename);
if (!(type & TYPE_XINETD))
return -1;
return readXinetdServiceInfo(name, service);
}
static struct dep *parseDeps(char *pos, char *end) {
char *t;
int numdeps = 0;
struct dep *deps = NULL;
while (1) {
while (*pos && isspace(*pos) && pos < end)
pos++;
if (pos == end)
break;
t = pos;
while (*t && !isspace(*t) && t < end)
t++;
if (isspace(*t)) {
*t = '\0';
t++;
}
numdeps++;
deps = realloc(deps, (numdeps + 1) * sizeof(struct dep));
deps[numdeps - 1].name = strdup(pos);
deps[numdeps - 1].handled = 0;
memset(&deps[numdeps], '\0', sizeof(struct dep));
if (!t || t >= end)
break;
else
pos = t;
}
return deps;
}
int parseServiceInfo(int fd, char *name, struct service *service, int honorHide,
int partialOk) {
struct stat sb;
char *bufstart, *bufstop, *start, *end, *next, *tmpbufstart;
struct service serv = {
name : NULL,
levels : -1,
kPriority : 100,
sPriority : -1,
currentLevels : 0,
desc : NULL,
startDeps : NULL,
stopDeps : NULL,
softStartDeps : NULL,
softStopDeps : NULL,
provides : NULL,
type : TYPE_INIT_D,
isLSB : 0,
enabled : 0
};
char overflow;
char levelbuf[20];
char *english_desc = NULL;
fstat(fd, &sb);
bufstart = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (bufstart == ((caddr_t)-1)) {
close(fd);
return -1;
}
tmpbufstart = (char *)malloc(sb.st_size + 1);
if (tmpbufstart == NULL) {
close(fd);
munmap(bufstart, sb.st_size);
return -1;
}
memcpy(tmpbufstart, bufstart, sb.st_size);
munmap(bufstart, sb.st_size);
bufstart = tmpbufstart;
bufstop = bufstart + sb.st_size;
*bufstop = 0;
close(fd);
next = bufstart;
while (next < bufstop && (serv.levels == -1 || !serv.desc)) {
start = next;
while (isspace(*start) && start < bufstop)
start++;
if (start == bufstop)
break;
end = strchr(start, '\n');
if (!end)
next = end = bufstop;
else
next = end + 1;
if (*start != '#')
continue;
start++;
if (!strncmp(start, "## BEGIN INIT INFO", 18))
serv.isLSB = 1;
while (isspace(*start) && start < end)
start++;
if (start == end)
continue;
if (honorHide && !strncmp(start, "hide:", 5)) {
start += 5;
while (isspace(*start) && start < end)
start++;
if (start == end || !strncmp(start, "true", 4)) {
if (serv.desc)
free(serv.desc);
free(bufstart);
return 1;
}
}
if (!strncmp(start, "chkconfig:", 10)) {
int spri, kpri;
start += 10;
while (isspace(*start) && start < end)
start++;
if (start == end) {
if (serv.desc)
free(serv.desc);
free(bufstart);
return 1;
}
if ((sscanf(start, "%15s %d %d%c", levelbuf, &spri, &kpri,
&overflow) != 4) ||
!isspace(overflow)) {
if (serv.desc)
free(serv.desc);
free(bufstart);
return 1;
}
if (spri > 99 || kpri > 99 || kpri < 0 || spri < 0) {
if (serv.desc)
free(serv.desc);
free(bufstart);
return 1;
}
if (serv.sPriority == -1)
serv.sPriority = spri;
if (serv.kPriority == 100)
serv.kPriority = kpri;
if (serv.levels == -1) {
if (!strcmp(levelbuf, "-"))
serv.levels = 0;
else
serv.levels = parseLevels(levelbuf, 0);
}
if (serv.levels == -1) {
if (serv.desc)
free(serv.desc);
free(bufstart);
return 1;
}
} else if (!strncmp(start, "description", 11) ||
!strncmp(start, "Description:", 12)) {
if (readDescription(start + 11, bufstop, &english_desc,
&serv.desc)) {
if (serv.desc)
free(serv.desc);
}
} else if (!strncmp(start, "Short-Description:", 18)) {
if (readDescription(start + 17, bufstop, &english_desc,
&serv.desc)) {
if (serv.desc)
free(serv.desc);
}
} else if (!strncmp(start, "Default-Start:", 14)) {
char *t;
start += 14;
while (1) {
int lev;
lev = strtol(start, &t, 10);
if (t && t != start)
start = t;
else
break;
if (serv.levels == -1)
serv.levels = 0;
serv.levels |= 1 << lev;
}
} else if (!strncmp(start, "Default-Stop:", 13)) {
char *t;
start += 13;
while (1) {
int lev;
lev = strtol(start, &t, 10);
if (t && t != start)
start = t;
else
break;
if (serv.levels == -1)
serv.levels = 0;
serv.levels &= ~(1 << lev);
}
} else if (!strncmp(start, "Required-Start:", 15)) {
start += 15;
serv.startDeps = parseDeps(start, end);
} else if (!strncmp(start, "Required-Stop:", 14)) {
start += 14;
serv.stopDeps = parseDeps(start, end);
} else if (!strncmp(start, "Should-Start:", 13)) {
start += 13;
serv.softStartDeps = parseDeps(start, end);
} else if (!strncmp(start, "Should-Stop:", 12)) {
start += 12;
serv.softStopDeps = parseDeps(start, end);
} else if (!strncmp(start, "Provides:", 9)) {
char *t;
int numdeps = 0;
start += 9;
while (1) {
while (*start && isspace(*start) && start < end)
start++;
if (start == end)
break;
t = start;
while (*t && !isspace(*t) && t < end)
t++;
if (isspace(*t)) {
*t = '\0';
t++;
}
numdeps++;
serv.provides =
realloc(serv.provides, (numdeps + 1) * sizeof(char *));
serv.provides[numdeps - 1] = strdup(start);
serv.provides[numdeps] = NULL;
if (!t || t >= end)
break;
else
start = t;
}
}
}
free(bufstart);
if (!serv.desc) {
if (english_desc)
serv.desc = english_desc;
else
serv.desc = strdup(name);
} else if (english_desc)
free(english_desc);
if (!partialOk &&
((serv.levels == -1) || !serv.desc ||
(!serv.isLSB && (serv.sPriority == -1 || serv.kPriority == 100)))) {
freeService(serv);
return 1;
}
serv.name = strdup(name);
if (!serv.provides) {
serv.provides = malloc(2 * sizeof(char *));
serv.provides[0] = strdup(name);
serv.provides[1] = NULL;
}
*service = serv;
return 0;
}
/* returns -1 on error */
int currentRunlevel(void) {
FILE *p;
char response[50];
p = popen("/sbin/runlevel", "r");
if (!p)
return -1;
if (!fgets(response, sizeof(response), p)) {
pclose(p);
return -1;
}
pclose(p);
if (response[1] != ' ' || !isdigit(response[2]) || response[3] != '\n')
return -1;
return response[2] - '0';
}
int findServiceEntries(char *name, int level, glob_t *globresptr) {
char *match;
glob_t globres;
int rc;
rc = asprintf(&match, "%s/rc%d.d/[SK][0-9][0-9]%s", RUNLEVELS, level, name);
if (rc < 0) {
fprintf(stderr, _("failed to glob pattern %s: %s\n"), match,
strerror(errno));
return 1;
}
rc = glob(match, GLOB_ERR | GLOB_NOSORT, NULL, &globres);
if (rc && rc != GLOB_NOMATCH) {
fprintf(stderr, _("failed to glob pattern %s: %s\n"), match,
strerror(errno));
free(match);
return 1;
} else if (rc == GLOB_NOMATCH) {
globresptr->gl_pathc = 0;
free(match);
return 0;
}
free(match);
*globresptr = globres;
return 0;
}
int isConfigured(char *name, int level, int *priority, char *type) {
glob_t globres;
char *pri_string;
if (findServiceEntries(name, level, &globres))
exit(1);
if (!globres.gl_pathc)
return 0;
if (type) {
*type = globres.gl_pathv[0][11];
}
if (priority) {
pri_string = strndup(globres.gl_pathv[0] + 12, 2);
if (!pri_string)
return 0;
sscanf(pri_string, "%d", priority);
free(pri_string);
}
globfree(&globres);
return 1;
}
int isOn(char *name, int level) {
glob_t globres;
if (level == -1) {
level = currentRunlevel();
if (level == -1) {
fprintf(stderr, _("cannot determine current run level\n"));
return 0;
}
}
if (findServiceEntries(name, level, &globres))
exit(1);
if (!globres.gl_pathc || !strstr(globres.gl_pathv[0], "/S"))
return 0;
globfree(&globres);
return 1;
}
int whatLevels(char *name) {
int i, ret = 0;
for (i = 0; i < 7; i++) {
ret |= (isOn(name, i) << i);
}
return ret;
}
int setXinetdService(struct service s, int on) {
int oldfd, newfd;
char oldfname[100], newfname[100];
char tmpstr[50];
char *buf, *ptr, *tmp, *start;
struct stat sb;
mode_t mode;
int r;
if (on == -1) {
on = s.enabled ? 1 : 0;
}
snprintf(oldfname, 100, "%s/%s", XINETDDIR, s.name);
if ((oldfd = open(oldfname, O_RDONLY)) == -1) {
return -1;
}
fstat(oldfd, &sb);
buf = malloc(sb.st_size + 1);
if (read(oldfd, buf, sb.st_size) != sb.st_size) {
close(oldfd);
free(buf);
return -1;
}
close(oldfd);
buf[sb.st_size] = '\0';
snprintf(newfname, 100, "%s/%s.XXXXXX", XINETDDIR, s.name);
mode = umask(S_IRWXG | S_IRWXO);
newfd = mkstemp(newfname);
umask(mode);
if (newfd == -1) {
free(buf);
return -1;
}
start = buf;
while (buf) {
tmp = buf;
ptr = strchr(buf, '\n');
if (ptr) {
*ptr = '\0';
ptr++;
}
while (isspace(*buf))
buf++;
if (strncmp(buf, "disable", 7) && strlen(buf)) {
write(newfd, tmp, strlen(tmp));
write(newfd, "\n", 1);
if (buf[0] == '{') {
snprintf(tmpstr, 50, "\tdisable\t= %s", on ? "no" : "yes");
write(newfd, tmpstr, strlen(tmpstr));
write(newfd, "\n", 1);
}
}
buf = ptr;
}
free(start);
close(newfd);
unlink(oldfname);
r = rename(newfname, oldfname);
if (selinux_restore(oldfname) != 0)
fprintf(stderr, _("Unable to set SELinux context for %s: %s\n"),
oldfname, strerror(errno));
return (r);
}
int doSetService(struct service s, int level, int on) {
int priority = on ? s.sPriority : s.kPriority;
char linkname[200];
char linkto[200];
glob_t globres;
int i;
if (!findServiceEntries(s.name, level, &globres)) {
for (i = 0; i < globres.gl_pathc; i++)
unlink(globres.gl_pathv[i]);
if (globres.gl_pathc)
globfree(&globres);
}
sprintf(linkname, "%s/rc%d.d/%c%02d%s", RUNLEVELS, level, on ? 'S' : 'K',
priority, s.name);
sprintf(linkto, "../init.d/%s", s.name);
unlink(linkname); /* just in case */
if (symlink(linkto, linkname)) {
fprintf(stderr, _("failed to make symlink %s: %s\n"), linkname,
strerror(errno));
return 1;
}
return 0;
}
int systemdIsInit() {
char *path = realpath("/sbin/init", NULL);
char *base = NULL;
if (!path)
return 0;
base = basename(path);
if (!base)
return 0;
if (strcmp(base, "systemd"))
return 0;
return 1;
}
int systemdActive() {
if (access("/run/systemd/system/", F_OK) < 0)
return 0;
if (!systemdIsInit())
return 0;
return 1;
}
int isOverriddenBySystemd(const char *service) {
char *p;
int rc = 0;
asprintf(&p, SYSTEMD_SERVICE_PATH "/%s.service", service);
if (access(p, F_OK) >= 0) {
rc = 1;
goto out;
}
free(p);
asprintf(&p, SYSTEMD_LOCAL_SERVICE_PATH "/%s.service", service);