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systemd/src/util.c
Chris E Ferron 54e4fdef80 MeeGo support 
This commit consists of the initial work to include MeeGo as a ported
distribution for systemd.

The majority of the changes are small configuration additions to auto
tools, so that MeeGo is identified as a valid distribution option.

Some small deviations will be noticed between the configuration of MeeGo
and other distributions. As MeeGo is a distribution striving for
compliancy to support its near embedded attributes and target users,
there is less user configuration options available by default. Most
services will be enabled by systemd as part of the distribution
requirements, and as such most links and service files will be pre-setup
for the MeeGo distribution. As much of this is going to be done within
the MeeGo distribution packaging this is still noteworthy to mention, as
it explains why in systemd you will observe configuration differences
where the MeeGo distribution removes all links in the pkgsysconfdir for
instance.  MeeGo will be user configurable if there is desire, but most
services will be enabled by the distribution as designated by the MeeGo
compliancy standards.

Other changes are in source to add such areas as meego-release defined
in utils, and hostname in hostname-setup, defining vconsole-setup,
localizations and rescue additions as needed.

As this is all ground work, MeeGo will continue to strive for complete
compatibility.
2011-04-20 01:05:30 +02:00

4531 lines
113 KiB
C
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>
#include <syslog.h>
#include <sched.h>
#include <sys/resource.h>
#include <linux/sched.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/ioctl.h>
#include <linux/vt.h>
#include <linux/tiocl.h>
#include <termios.h>
#include <stdarg.h>
#include <sys/inotify.h>
#include <sys/poll.h>
#include <libgen.h>
#include <ctype.h>
#include <sys/prctl.h>
#include <sys/utsname.h>
#include <pwd.h>
#include <netinet/ip.h>
#include <linux/kd.h>
#include <dlfcn.h>
#include <sys/wait.h>
#include <sys/capability.h>
#include "macro.h"
#include "util.h"
#include "ioprio.h"
#include "missing.h"
#include "log.h"
#include "strv.h"
#include "label.h"
#include "exit-status.h"
#include "hashmap.h"
size_t page_size(void) {
static __thread size_t pgsz = 0;
long r;
if (pgsz)
return pgsz;
assert_se((r = sysconf(_SC_PAGESIZE)) > 0);
pgsz = (size_t) r;
return pgsz;
}
bool streq_ptr(const char *a, const char *b) {
/* Like streq(), but tries to make sense of NULL pointers */
if (a && b)
return streq(a, b);
if (!a && !b)
return true;
return false;
}
usec_t now(clockid_t clock_id) {
struct timespec ts;
assert_se(clock_gettime(clock_id, &ts) == 0);
return timespec_load(&ts);
}
dual_timestamp* dual_timestamp_get(dual_timestamp *ts) {
assert(ts);
ts->realtime = now(CLOCK_REALTIME);
ts->monotonic = now(CLOCK_MONOTONIC);
return ts;
}
usec_t timespec_load(const struct timespec *ts) {
assert(ts);
return
(usec_t) ts->tv_sec * USEC_PER_SEC +
(usec_t) ts->tv_nsec / NSEC_PER_USEC;
}
struct timespec *timespec_store(struct timespec *ts, usec_t u) {
assert(ts);
ts->tv_sec = (time_t) (u / USEC_PER_SEC);
ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
return ts;
}
usec_t timeval_load(const struct timeval *tv) {
assert(tv);
return
(usec_t) tv->tv_sec * USEC_PER_SEC +
(usec_t) tv->tv_usec;
}
struct timeval *timeval_store(struct timeval *tv, usec_t u) {
assert(tv);
tv->tv_sec = (time_t) (u / USEC_PER_SEC);
tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
return tv;
}
bool endswith(const char *s, const char *postfix) {
size_t sl, pl;
assert(s);
assert(postfix);
sl = strlen(s);
pl = strlen(postfix);
if (pl == 0)
return true;
if (sl < pl)
return false;
return memcmp(s + sl - pl, postfix, pl) == 0;
}
bool startswith(const char *s, const char *prefix) {
size_t sl, pl;
assert(s);
assert(prefix);
sl = strlen(s);
pl = strlen(prefix);
if (pl == 0)
return true;
if (sl < pl)
return false;
return memcmp(s, prefix, pl) == 0;
}
bool startswith_no_case(const char *s, const char *prefix) {
size_t sl, pl;
unsigned i;
assert(s);
assert(prefix);
sl = strlen(s);
pl = strlen(prefix);
if (pl == 0)
return true;
if (sl < pl)
return false;
for(i = 0; i < pl; ++i) {
if (tolower(s[i]) != tolower(prefix[i]))
return false;
}
return true;
}
bool first_word(const char *s, const char *word) {
size_t sl, wl;
assert(s);
assert(word);
sl = strlen(s);
wl = strlen(word);
if (sl < wl)
return false;
if (wl == 0)
return true;
if (memcmp(s, word, wl) != 0)
return false;
return s[wl] == 0 ||
strchr(WHITESPACE, s[wl]);
}
int close_nointr(int fd) {
assert(fd >= 0);
for (;;) {
int r;
if ((r = close(fd)) >= 0)
return r;
if (errno != EINTR)
return r;
}
}
void close_nointr_nofail(int fd) {
int saved_errno = errno;
/* like close_nointr() but cannot fail, and guarantees errno
* is unchanged */
assert_se(close_nointr(fd) == 0);
errno = saved_errno;
}
void close_many(const int fds[], unsigned n_fd) {
unsigned i;
for (i = 0; i < n_fd; i++)
close_nointr_nofail(fds[i]);
}
int parse_boolean(const char *v) {
assert(v);
if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
return 1;
else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
return 0;
return -EINVAL;
}
int parse_pid(const char *s, pid_t* ret_pid) {
unsigned long ul = 0;
pid_t pid;
int r;
assert(s);
assert(ret_pid);
if ((r = safe_atolu(s, &ul)) < 0)
return r;
pid = (pid_t) ul;
if ((unsigned long) pid != ul)
return -ERANGE;
if (pid <= 0)
return -ERANGE;
*ret_pid = pid;
return 0;
}
int safe_atou(const char *s, unsigned *ret_u) {
char *x = NULL;
unsigned long l;
assert(s);
assert(ret_u);
errno = 0;
l = strtoul(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
if ((unsigned long) (unsigned) l != l)
return -ERANGE;
*ret_u = (unsigned) l;
return 0;
}
int safe_atoi(const char *s, int *ret_i) {
char *x = NULL;
long l;
assert(s);
assert(ret_i);
errno = 0;
l = strtol(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
if ((long) (int) l != l)
return -ERANGE;
*ret_i = (int) l;
return 0;
}
int safe_atollu(const char *s, long long unsigned *ret_llu) {
char *x = NULL;
unsigned long long l;
assert(s);
assert(ret_llu);
errno = 0;
l = strtoull(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
*ret_llu = l;
return 0;
}
int safe_atolli(const char *s, long long int *ret_lli) {
char *x = NULL;
long long l;
assert(s);
assert(ret_lli);
errno = 0;
l = strtoll(s, &x, 0);
if (!x || *x || errno)
return errno ? -errno : -EINVAL;
*ret_lli = l;
return 0;
}
/* Split a string into words. */
char *split(const char *c, size_t *l, const char *separator, char **state) {
char *current;
current = *state ? *state : (char*) c;
if (!*current || *c == 0)
return NULL;
current += strspn(current, separator);
*l = strcspn(current, separator);
*state = current+*l;
return (char*) current;
}
/* Split a string into words, but consider strings enclosed in '' and
* "" as words even if they include spaces. */
char *split_quoted(const char *c, size_t *l, char **state) {
char *current, *e;
bool escaped = false;
current = *state ? *state : (char*) c;
if (!*current || *c == 0)
return NULL;
current += strspn(current, WHITESPACE);
if (*current == '\'') {
current ++;
for (e = current; *e; e++) {
if (escaped)
escaped = false;
else if (*e == '\\')
escaped = true;
else if (*e == '\'')
break;
}
*l = e-current;
*state = *e == 0 ? e : e+1;
} else if (*current == '\"') {
current ++;
for (e = current; *e; e++) {
if (escaped)
escaped = false;
else if (*e == '\\')
escaped = true;
else if (*e == '\"')
break;
}
*l = e-current;
*state = *e == 0 ? e : e+1;
} else {
for (e = current; *e; e++) {
if (escaped)
escaped = false;
else if (*e == '\\')
escaped = true;
else if (strchr(WHITESPACE, *e))
break;
}
*l = e-current;
*state = e;
}
return (char*) current;
}
char **split_path_and_make_absolute(const char *p) {
char **l;
assert(p);
if (!(l = strv_split(p, ":")))
return NULL;
if (!strv_path_make_absolute_cwd(l)) {
strv_free(l);
return NULL;
}
return l;
}
int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
int r;
FILE *f;
char fn[PATH_MAX], line[LINE_MAX], *p;
long unsigned ppid;
assert(pid > 0);
assert(_ppid);
assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1));
char_array_0(fn);
if (!(f = fopen(fn, "r")))
return -errno;
if (!(fgets(line, sizeof(line), f))) {
r = -errno;
fclose(f);
return r;
}
fclose(f);
/* Let's skip the pid and comm fields. The latter is enclosed
* in () but does not escape any () in its value, so let's
* skip over it manually */
if (!(p = strrchr(line, ')')))
return -EIO;
p++;
if (sscanf(p, " "
"%*c " /* state */
"%lu ", /* ppid */
&ppid) != 1)
return -EIO;
if ((long unsigned) (pid_t) ppid != ppid)
return -ERANGE;
*_ppid = (pid_t) ppid;
return 0;
}
int get_starttime_of_pid(pid_t pid, unsigned long long *st) {
int r;
FILE *f;
char fn[PATH_MAX], line[LINE_MAX], *p;
assert(pid > 0);
assert(st);
assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%lu/stat", (unsigned long) pid) < (int) (sizeof(fn)-1));
char_array_0(fn);
if (!(f = fopen(fn, "r")))
return -errno;
if (!(fgets(line, sizeof(line), f))) {
r = -errno;
fclose(f);
return r;
}
fclose(f);
/* Let's skip the pid and comm fields. The latter is enclosed
* in () but does not escape any () in its value, so let's
* skip over it manually */
if (!(p = strrchr(line, ')')))
return -EIO;
p++;
if (sscanf(p, " "
"%*c " /* state */
"%*d " /* ppid */
"%*d " /* pgrp */
"%*d " /* session */
"%*d " /* tty_nr */
"%*d " /* tpgid */
"%*u " /* flags */
"%*u " /* minflt */
"%*u " /* cminflt */
"%*u " /* majflt */
"%*u " /* cmajflt */
"%*u " /* utime */
"%*u " /* stime */
"%*d " /* cutime */
"%*d " /* cstime */
"%*d " /* priority */
"%*d " /* nice */
"%*d " /* num_threads */
"%*d " /* itrealvalue */
"%llu " /* starttime */,
st) != 1)
return -EIO;
return 0;
}
int write_one_line_file(const char *fn, const char *line) {
FILE *f;
int r;
assert(fn);
assert(line);
if (!(f = fopen(fn, "we")))
return -errno;
if (fputs(line, f) < 0) {
r = -errno;
goto finish;
}
if (!endswith(line, "\n"))
fputc('\n', f);
fflush(f);
if (ferror(f)) {
if (errno != 0)
r = -errno;
else
r = -EIO;
} else
r = 0;
finish:
fclose(f);
return r;
}
int read_one_line_file(const char *fn, char **line) {
FILE *f;
int r;
char t[LINE_MAX], *c;
assert(fn);
assert(line);
if (!(f = fopen(fn, "re")))
return -errno;
if (!(fgets(t, sizeof(t), f))) {
r = -errno;
goto finish;
}
if (!(c = strdup(t))) {
r = -ENOMEM;
goto finish;
}
truncate_nl(c);
*line = c;
r = 0;
finish:
fclose(f);
return r;
}
int read_full_file(const char *fn, char **contents) {
FILE *f;
int r;
size_t n, l;
char *buf = NULL;
struct stat st;
if (!(f = fopen(fn, "re")))
return -errno;
if (fstat(fileno(f), &st) < 0) {
r = -errno;
goto finish;
}
n = st.st_size > 0 ? st.st_size : LINE_MAX;
l = 0;
for (;;) {
char *t;
size_t k;
if (!(t = realloc(buf, n+1))) {
r = -ENOMEM;
goto finish;
}
buf = t;
k = fread(buf + l, 1, n - l, f);
if (k <= 0) {
if (ferror(f)) {
r = -errno;
goto finish;
}
break;
}
l += k;
n *= 2;
/* Safety check */
if (n > 4*1024*1024) {
r = -E2BIG;
goto finish;
}
}
if (buf)
buf[l] = 0;
else if (!(buf = calloc(1, 1))) {
r = -errno;
goto finish;
}
*contents = buf;
buf = NULL;
r = 0;
finish:
fclose(f);
free(buf);
return r;
}
int parse_env_file(
const char *fname,
const char *separator, ...) {
int r = 0;
char *contents, *p;
assert(fname);
assert(separator);
if ((r = read_full_file(fname, &contents)) < 0)
return r;
p = contents;
for (;;) {
const char *key = NULL;
p += strspn(p, separator);
p += strspn(p, WHITESPACE);
if (!*p)
break;
if (!strchr(COMMENTS, *p)) {
va_list ap;
char **value;
va_start(ap, separator);
while ((key = va_arg(ap, char *))) {
size_t n;
char *v;
value = va_arg(ap, char **);
n = strlen(key);
if (strncmp(p, key, n) != 0 ||
p[n] != '=')
continue;
p += n + 1;
n = strcspn(p, separator);
if (n >= 2 &&
strchr(QUOTES, p[0]) &&
p[n-1] == p[0])
v = strndup(p+1, n-2);
else
v = strndup(p, n);
if (!v) {
r = -ENOMEM;
va_end(ap);
goto fail;
}
if (v[0] == '\0') {
/* return empty value strings as NULL */
free(v);
v = NULL;
}
free(*value);
*value = v;
p += n;
r ++;
break;
}
va_end(ap);
}
if (!key)
p += strcspn(p, separator);
}
fail:
free(contents);
return r;
}
int load_env_file(
const char *fname,
char ***rl) {
FILE *f;
char **m = 0;
int r;
assert(fname);
assert(rl);
if (!(f = fopen(fname, "re")))
return -errno;
while (!feof(f)) {
char l[LINE_MAX], *p, *u;
char **t;
if (!fgets(l, sizeof(l), f)) {
if (feof(f))
break;
r = -errno;
goto finish;
}
p = strstrip(l);
if (!*p)
continue;
if (strchr(COMMENTS, *p))
continue;
if (!(u = normalize_env_assignment(p))) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
t = strv_append(m, u);
free(u);
if (!t) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
strv_free(m);
m = t;
}
r = 0;
*rl = m;
m = NULL;
finish:
if (f)
fclose(f);
strv_free(m);
return r;
}
int write_env_file(const char *fname, char **l) {
char **i;
FILE *f;
int r;
f = fopen(fname, "we");
if (!f)
return -errno;
STRV_FOREACH(i, l) {
fputs(*i, f);
fputc('\n', f);
}
fflush(f);
r = ferror(f) ? -errno : 0;
fclose(f);
return r;
}
char *truncate_nl(char *s) {
assert(s);
s[strcspn(s, NEWLINE)] = 0;
return s;
}
int get_process_name(pid_t pid, char **name) {
char *p;
int r;
assert(pid >= 1);
assert(name);
if (asprintf(&p, "/proc/%lu/comm", (unsigned long) pid) < 0)
return -ENOMEM;
r = read_one_line_file(p, name);
free(p);
if (r < 0)
return r;
return 0;
}
int get_process_cmdline(pid_t pid, size_t max_length, char **line) {
char *p, *r, *k;
int c;
bool space = false;
size_t left;
FILE *f;
assert(pid >= 1);
assert(max_length > 0);
assert(line);
if (asprintf(&p, "/proc/%lu/cmdline", (unsigned long) pid) < 0)
return -ENOMEM;
f = fopen(p, "r");
free(p);
if (!f)
return -errno;
if (!(r = new(char, max_length))) {
fclose(f);
return -ENOMEM;
}
k = r;
left = max_length;
while ((c = getc(f)) != EOF) {
if (isprint(c)) {
if (space) {
if (left <= 4)
break;
*(k++) = ' ';
left--;
space = false;
}
if (left <= 4)
break;
*(k++) = (char) c;
left--;
} else
space = true;
}
if (left <= 4) {
size_t n = MIN(left-1, 3U);
memcpy(k, "...", n);
k[n] = 0;
} else
*k = 0;
fclose(f);
/* Kernel threads have no argv[] */
if (r[0] == 0) {
char *t;
int h;
free(r);
if ((h = get_process_name(pid, &t)) < 0)
return h;
h = asprintf(&r, "[%s]", t);
free(t);
if (h < 0)
return -ENOMEM;
}
*line = r;
return 0;
}
char *strnappend(const char *s, const char *suffix, size_t b) {
size_t a;
char *r;
if (!s && !suffix)
return strdup("");
if (!s)
return strndup(suffix, b);
if (!suffix)
return strdup(s);
assert(s);
assert(suffix);
a = strlen(s);
if (!(r = new(char, a+b+1)))
return NULL;
memcpy(r, s, a);
memcpy(r+a, suffix, b);
r[a+b] = 0;
return r;
}
char *strappend(const char *s, const char *suffix) {
return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
}
int readlink_malloc(const char *p, char **r) {
size_t l = 100;
assert(p);
assert(r);
for (;;) {
char *c;
ssize_t n;
if (!(c = new(char, l)))
return -ENOMEM;
if ((n = readlink(p, c, l-1)) < 0) {
int ret = -errno;
free(c);
return ret;
}
if ((size_t) n < l-1) {
c[n] = 0;
*r = c;
return 0;
}
free(c);
l *= 2;
}
}
int readlink_and_make_absolute(const char *p, char **r) {
char *target, *k;
int j;
assert(p);
assert(r);
if ((j = readlink_malloc(p, &target)) < 0)
return j;
k = file_in_same_dir(p, target);
free(target);
if (!k)
return -ENOMEM;
*r = k;
return 0;
}
int parent_of_path(const char *path, char **_r) {
const char *e, *a = NULL, *b = NULL, *p;
char *r;
bool slash = false;
assert(path);
assert(_r);
if (!*path)
return -EINVAL;
for (e = path; *e; e++) {
if (!slash && *e == '/') {
a = b;
b = e;
slash = true;
} else if (slash && *e != '/')
slash = false;
}
if (*(e-1) == '/')
p = a;
else
p = b;
if (!p)
return -EINVAL;
if (p == path)
r = strdup("/");
else
r = strndup(path, p-path);
if (!r)
return -ENOMEM;
*_r = r;
return 0;
}
char *file_name_from_path(const char *p) {
char *r;
assert(p);
if ((r = strrchr(p, '/')))
return r + 1;
return (char*) p;
}
bool path_is_absolute(const char *p) {
assert(p);
return p[0] == '/';
}
bool is_path(const char *p) {
return !!strchr(p, '/');
}
char *path_make_absolute(const char *p, const char *prefix) {
char *r;
assert(p);
/* Makes every item in the list an absolute path by prepending
* the prefix, if specified and necessary */
if (path_is_absolute(p) || !prefix)
return strdup(p);
if (asprintf(&r, "%s/%s", prefix, p) < 0)
return NULL;
return r;
}
char *path_make_absolute_cwd(const char *p) {
char *cwd, *r;
assert(p);
/* Similar to path_make_absolute(), but prefixes with the
* current working directory. */
if (path_is_absolute(p))
return strdup(p);
if (!(cwd = get_current_dir_name()))
return NULL;
r = path_make_absolute(p, cwd);
free(cwd);
return r;
}
char **strv_path_make_absolute_cwd(char **l) {
char **s;
/* Goes through every item in the string list and makes it
* absolute. This works in place and won't rollback any
* changes on failure. */
STRV_FOREACH(s, l) {
char *t;
if (!(t = path_make_absolute_cwd(*s)))
return NULL;
free(*s);
*s = t;
}
return l;
}
char **strv_path_canonicalize(char **l) {
char **s;
unsigned k = 0;
bool enomem = false;
if (strv_isempty(l))
return l;
/* Goes through every item in the string list and canonicalize
* the path. This works in place and won't rollback any
* changes on failure. */
STRV_FOREACH(s, l) {
char *t, *u;
t = path_make_absolute_cwd(*s);
free(*s);
if (!t) {
enomem = true;
continue;
}
errno = 0;
u = canonicalize_file_name(t);
free(t);
if (!u) {
if (errno == ENOMEM || !errno)
enomem = true;
continue;
}
l[k++] = u;
}
l[k] = NULL;
if (enomem)
return NULL;
return l;
}
int reset_all_signal_handlers(void) {
int sig;
for (sig = 1; sig < _NSIG; sig++) {
struct sigaction sa;
if (sig == SIGKILL || sig == SIGSTOP)
continue;
zero(sa);
sa.sa_handler = SIG_DFL;
sa.sa_flags = SA_RESTART;
/* On Linux the first two RT signals are reserved by
* glibc, and sigaction() will return EINVAL for them. */
if ((sigaction(sig, &sa, NULL) < 0))
if (errno != EINVAL)
return -errno;
}
return 0;
}
char *strstrip(char *s) {
char *e, *l = NULL;
/* Drops trailing whitespace. Modifies the string in
* place. Returns pointer to first non-space character */
s += strspn(s, WHITESPACE);
for (e = s; *e; e++)
if (!strchr(WHITESPACE, *e))
l = e;
if (l)
*(l+1) = 0;
else
*s = 0;
return s;
}
char *delete_chars(char *s, const char *bad) {
char *f, *t;
/* Drops all whitespace, regardless where in the string */
for (f = s, t = s; *f; f++) {
if (strchr(bad, *f))
continue;
*(t++) = *f;
}
*t = 0;
return s;
}
char *file_in_same_dir(const char *path, const char *filename) {
char *e, *r;
size_t k;
assert(path);
assert(filename);
/* This removes the last component of path and appends
* filename, unless the latter is absolute anyway or the
* former isn't */
if (path_is_absolute(filename))
return strdup(filename);
if (!(e = strrchr(path, '/')))
return strdup(filename);
k = strlen(filename);
if (!(r = new(char, e-path+1+k+1)))
return NULL;
memcpy(r, path, e-path+1);
memcpy(r+(e-path)+1, filename, k+1);
return r;
}
int safe_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) {
struct stat st;
if (label_mkdir(path, mode) >= 0)
if (chmod_and_chown(path, mode, uid, gid) < 0)
return -errno;
if (lstat(path, &st) < 0)
return -errno;
if ((st.st_mode & 0777) != mode ||
st.st_uid != uid ||
st.st_gid != gid ||
!S_ISDIR(st.st_mode)) {
errno = EEXIST;
return -errno;
}
return 0;
}
int mkdir_parents(const char *path, mode_t mode) {
const char *p, *e;
assert(path);
/* Creates every parent directory in the path except the last
* component. */
p = path + strspn(path, "/");
for (;;) {
int r;
char *t;
e = p + strcspn(p, "/");
p = e + strspn(e, "/");
/* Is this the last component? If so, then we're
* done */
if (*p == 0)
return 0;
if (!(t = strndup(path, e - path)))
return -ENOMEM;
r = label_mkdir(t, mode);
free(t);
if (r < 0 && errno != EEXIST)
return -errno;
}
}
int mkdir_p(const char *path, mode_t mode) {
int r;
/* Like mkdir -p */
if ((r = mkdir_parents(path, mode)) < 0)
return r;
if (label_mkdir(path, mode) < 0 && errno != EEXIST)
return -errno;
return 0;
}
int rmdir_parents(const char *path, const char *stop) {
size_t l;
int r = 0;
assert(path);
assert(stop);
l = strlen(path);
/* Skip trailing slashes */
while (l > 0 && path[l-1] == '/')
l--;
while (l > 0) {
char *t;
/* Skip last component */
while (l > 0 && path[l-1] != '/')
l--;
/* Skip trailing slashes */
while (l > 0 && path[l-1] == '/')
l--;
if (l <= 0)
break;
if (!(t = strndup(path, l)))
return -ENOMEM;
if (path_startswith(stop, t)) {
free(t);
return 0;
}
r = rmdir(t);
free(t);
if (r < 0)
if (errno != ENOENT)
return -errno;
}
return 0;
}
char hexchar(int x) {
static const char table[16] = "0123456789abcdef";
return table[x & 15];
}
int unhexchar(char c) {
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return -1;
}
char octchar(int x) {
return '0' + (x & 7);
}
int unoctchar(char c) {
if (c >= '0' && c <= '7')
return c - '0';
return -1;
}
char decchar(int x) {
return '0' + (x % 10);
}
int undecchar(char c) {
if (c >= '0' && c <= '9')
return c - '0';
return -1;
}
char *cescape(const char *s) {
char *r, *t;
const char *f;
assert(s);
/* Does C style string escaping. */
if (!(r = new(char, strlen(s)*4 + 1)))
return NULL;
for (f = s, t = r; *f; f++)
switch (*f) {
case '\a':
*(t++) = '\\';
*(t++) = 'a';
break;
case '\b':
*(t++) = '\\';
*(t++) = 'b';
break;
case '\f':
*(t++) = '\\';
*(t++) = 'f';
break;
case '\n':
*(t++) = '\\';
*(t++) = 'n';
break;
case '\r':
*(t++) = '\\';
*(t++) = 'r';
break;
case '\t':
*(t++) = '\\';
*(t++) = 't';
break;
case '\v':
*(t++) = '\\';
*(t++) = 'v';
break;
case '\\':
*(t++) = '\\';
*(t++) = '\\';
break;
case '"':
*(t++) = '\\';
*(t++) = '"';
break;
case '\'':
*(t++) = '\\';
*(t++) = '\'';
break;
default:
/* For special chars we prefer octal over
* hexadecimal encoding, simply because glib's
* g_strescape() does the same */
if ((*f < ' ') || (*f >= 127)) {
*(t++) = '\\';
*(t++) = octchar((unsigned char) *f >> 6);
*(t++) = octchar((unsigned char) *f >> 3);
*(t++) = octchar((unsigned char) *f);
} else
*(t++) = *f;
break;
}
*t = 0;
return r;
}
char *cunescape_length(const char *s, size_t length) {
char *r, *t;
const char *f;
assert(s);
/* Undoes C style string escaping */
if (!(r = new(char, length+1)))
return r;
for (f = s, t = r; f < s + length; f++) {
if (*f != '\\') {
*(t++) = *f;
continue;
}
f++;
switch (*f) {
case 'a':
*(t++) = '\a';
break;
case 'b':
*(t++) = '\b';
break;
case 'f':
*(t++) = '\f';
break;
case 'n':
*(t++) = '\n';
break;
case 'r':
*(t++) = '\r';
break;
case 't':
*(t++) = '\t';
break;
case 'v':
*(t++) = '\v';
break;
case '\\':
*(t++) = '\\';
break;
case '"':
*(t++) = '"';
break;
case '\'':
*(t++) = '\'';
break;
case 's':
/* This is an extension of the XDG syntax files */
*(t++) = ' ';
break;
case 'x': {
/* hexadecimal encoding */
int a, b;
if ((a = unhexchar(f[1])) < 0 ||
(b = unhexchar(f[2])) < 0) {
/* Invalid escape code, let's take it literal then */
*(t++) = '\\';
*(t++) = 'x';
} else {
*(t++) = (char) ((a << 4) | b);
f += 2;
}
break;
}
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7': {
/* octal encoding */
int a, b, c;
if ((a = unoctchar(f[0])) < 0 ||
(b = unoctchar(f[1])) < 0 ||
(c = unoctchar(f[2])) < 0) {
/* Invalid escape code, let's take it literal then */
*(t++) = '\\';
*(t++) = f[0];
} else {
*(t++) = (char) ((a << 6) | (b << 3) | c);
f += 2;
}
break;
}
case 0:
/* premature end of string.*/
*(t++) = '\\';
goto finish;
default:
/* Invalid escape code, let's take it literal then */
*(t++) = '\\';
*(t++) = *f;
break;
}
}
finish:
*t = 0;
return r;
}
char *cunescape(const char *s) {
return cunescape_length(s, strlen(s));
}
char *xescape(const char *s, const char *bad) {
char *r, *t;
const char *f;
/* Escapes all chars in bad, in addition to \ and all special
* chars, in \xFF style escaping. May be reversed with
* cunescape. */
if (!(r = new(char, strlen(s)*4+1)))
return NULL;
for (f = s, t = r; *f; f++) {
if ((*f < ' ') || (*f >= 127) ||
(*f == '\\') || strchr(bad, *f)) {
*(t++) = '\\';
*(t++) = 'x';
*(t++) = hexchar(*f >> 4);
*(t++) = hexchar(*f);
} else
*(t++) = *f;
}
*t = 0;
return r;
}
char *bus_path_escape(const char *s) {
char *r, *t;
const char *f;
assert(s);
/* Escapes all chars that D-Bus' object path cannot deal
* with. Can be reverse with bus_path_unescape() */
if (!(r = new(char, strlen(s)*3+1)))
return NULL;
for (f = s, t = r; *f; f++) {
if (!(*f >= 'A' && *f <= 'Z') &&
!(*f >= 'a' && *f <= 'z') &&
!(*f >= '0' && *f <= '9')) {
*(t++) = '_';
*(t++) = hexchar(*f >> 4);
*(t++) = hexchar(*f);
} else
*(t++) = *f;
}
*t = 0;
return r;
}
char *bus_path_unescape(const char *f) {
char *r, *t;
assert(f);
if (!(r = strdup(f)))
return NULL;
for (t = r; *f; f++) {
if (*f == '_') {
int a, b;
if ((a = unhexchar(f[1])) < 0 ||
(b = unhexchar(f[2])) < 0) {
/* Invalid escape code, let's take it literal then */
*(t++) = '_';
} else {
*(t++) = (char) ((a << 4) | b);
f += 2;
}
} else
*(t++) = *f;
}
*t = 0;
return r;
}
char *path_kill_slashes(char *path) {
char *f, *t;
bool slash = false;
/* Removes redundant inner and trailing slashes. Modifies the
* passed string in-place.
*
* ///foo///bar/ becomes /foo/bar
*/
for (f = path, t = path; *f; f++) {
if (*f == '/') {
slash = true;
continue;
}
if (slash) {
slash = false;
*(t++) = '/';
}
*(t++) = *f;
}
/* Special rule, if we are talking of the root directory, a
trailing slash is good */
if (t == path && slash)
*(t++) = '/';
*t = 0;
return path;
}
bool path_startswith(const char *path, const char *prefix) {
assert(path);
assert(prefix);
if ((path[0] == '/') != (prefix[0] == '/'))
return false;
for (;;) {
size_t a, b;
path += strspn(path, "/");
prefix += strspn(prefix, "/");
if (*prefix == 0)
return true;
if (*path == 0)
return false;
a = strcspn(path, "/");
b = strcspn(prefix, "/");
if (a != b)
return false;
if (memcmp(path, prefix, a) != 0)
return false;
path += a;
prefix += b;
}
}
bool path_equal(const char *a, const char *b) {
assert(a);
assert(b);
if ((a[0] == '/') != (b[0] == '/'))
return false;
for (;;) {
size_t j, k;
a += strspn(a, "/");
b += strspn(b, "/");
if (*a == 0 && *b == 0)
return true;
if (*a == 0 || *b == 0)
return false;
j = strcspn(a, "/");
k = strcspn(b, "/");
if (j != k)
return false;
if (memcmp(a, b, j) != 0)
return false;
a += j;
b += k;
}
}
char *ascii_strlower(char *t) {
char *p;
assert(t);
for (p = t; *p; p++)
if (*p >= 'A' && *p <= 'Z')
*p = *p - 'A' + 'a';
return t;
}
bool ignore_file(const char *filename) {
assert(filename);
return
filename[0] == '.' ||
streq(filename, "lost+found") ||
streq(filename, "aquota.user") ||
streq(filename, "aquota.group") ||
endswith(filename, "~") ||
endswith(filename, ".rpmnew") ||
endswith(filename, ".rpmsave") ||
endswith(filename, ".rpmorig") ||
endswith(filename, ".dpkg-old") ||
endswith(filename, ".dpkg-new") ||
endswith(filename, ".swp");
}
int fd_nonblock(int fd, bool nonblock) {
int flags;
assert(fd >= 0);
if ((flags = fcntl(fd, F_GETFL, 0)) < 0)
return -errno;
if (nonblock)
flags |= O_NONBLOCK;
else
flags &= ~O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0)
return -errno;
return 0;
}
int fd_cloexec(int fd, bool cloexec) {
int flags;
assert(fd >= 0);
if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
return -errno;
if (cloexec)
flags |= FD_CLOEXEC;
else
flags &= ~FD_CLOEXEC;
if (fcntl(fd, F_SETFD, flags) < 0)
return -errno;
return 0;
}
int close_all_fds(const int except[], unsigned n_except) {
DIR *d;
struct dirent *de;
int r = 0;
if (!(d = opendir("/proc/self/fd")))
return -errno;
while ((de = readdir(d))) {
int fd = -1;
if (ignore_file(de->d_name))
continue;
if (safe_atoi(de->d_name, &fd) < 0)
/* Let's better ignore this, just in case */
continue;
if (fd < 3)
continue;
if (fd == dirfd(d))
continue;
if (except) {
bool found;
unsigned i;
found = false;
for (i = 0; i < n_except; i++)
if (except[i] == fd) {
found = true;
break;
}
if (found)
continue;
}
if (close_nointr(fd) < 0) {
/* Valgrind has its own FD and doesn't want to have it closed */
if (errno != EBADF && r == 0)
r = -errno;
}
}
closedir(d);
return r;
}
bool chars_intersect(const char *a, const char *b) {
const char *p;
/* Returns true if any of the chars in a are in b. */
for (p = a; *p; p++)
if (strchr(b, *p))
return true;
return false;
}
char *format_timestamp(char *buf, size_t l, usec_t t) {
struct tm tm;
time_t sec;
assert(buf);
assert(l > 0);
if (t <= 0)
return NULL;
sec = (time_t) (t / USEC_PER_SEC);
if (strftime(buf, l, "%a, %d %b %Y %H:%M:%S %z", localtime_r(&sec, &tm)) <= 0)
return NULL;
return buf;
}
char *format_timestamp_pretty(char *buf, size_t l, usec_t t) {
usec_t n, d;
n = now(CLOCK_REALTIME);
if (t <= 0 || t > n || t + USEC_PER_DAY*7 <= t)
return NULL;
d = n - t;
if (d >= USEC_PER_YEAR)
snprintf(buf, l, "%llu years and %llu months ago",
(unsigned long long) (d / USEC_PER_YEAR),
(unsigned long long) ((d % USEC_PER_YEAR) / USEC_PER_MONTH));
else if (d >= USEC_PER_MONTH)
snprintf(buf, l, "%llu months and %llu days ago",
(unsigned long long) (d / USEC_PER_MONTH),
(unsigned long long) ((d % USEC_PER_MONTH) / USEC_PER_DAY));
else if (d >= USEC_PER_WEEK)
snprintf(buf, l, "%llu weeks and %llu days ago",
(unsigned long long) (d / USEC_PER_WEEK),
(unsigned long long) ((d % USEC_PER_WEEK) / USEC_PER_DAY));
else if (d >= 2*USEC_PER_DAY)
snprintf(buf, l, "%llu days ago", (unsigned long long) (d / USEC_PER_DAY));
else if (d >= 25*USEC_PER_HOUR)
snprintf(buf, l, "1 day and %lluh ago",
(unsigned long long) ((d - USEC_PER_DAY) / USEC_PER_HOUR));
else if (d >= 6*USEC_PER_HOUR)
snprintf(buf, l, "%lluh ago",
(unsigned long long) (d / USEC_PER_HOUR));
else if (d >= USEC_PER_HOUR)
snprintf(buf, l, "%lluh %llumin ago",
(unsigned long long) (d / USEC_PER_HOUR),
(unsigned long long) ((d % USEC_PER_HOUR) / USEC_PER_MINUTE));
else if (d >= 5*USEC_PER_MINUTE)
snprintf(buf, l, "%llumin ago",
(unsigned long long) (d / USEC_PER_MINUTE));
else if (d >= USEC_PER_MINUTE)
snprintf(buf, l, "%llumin %llus ago",
(unsigned long long) (d / USEC_PER_MINUTE),
(unsigned long long) ((d % USEC_PER_MINUTE) / USEC_PER_SEC));
else if (d >= USEC_PER_SEC)
snprintf(buf, l, "%llus ago",
(unsigned long long) (d / USEC_PER_SEC));
else if (d >= USEC_PER_MSEC)
snprintf(buf, l, "%llums ago",
(unsigned long long) (d / USEC_PER_MSEC));
else if (d > 0)
snprintf(buf, l, "%lluus ago",
(unsigned long long) d);
else
snprintf(buf, l, "now");
buf[l-1] = 0;
return buf;
}
char *format_timespan(char *buf, size_t l, usec_t t) {
static const struct {
const char *suffix;
usec_t usec;
} table[] = {
{ "w", USEC_PER_WEEK },
{ "d", USEC_PER_DAY },
{ "h", USEC_PER_HOUR },
{ "min", USEC_PER_MINUTE },
{ "s", USEC_PER_SEC },
{ "ms", USEC_PER_MSEC },
{ "us", 1 },
};
unsigned i;
char *p = buf;
assert(buf);
assert(l > 0);
if (t == (usec_t) -1)
return NULL;
if (t == 0) {
snprintf(p, l, "0");
p[l-1] = 0;
return p;
}
/* The result of this function can be parsed with parse_usec */
for (i = 0; i < ELEMENTSOF(table); i++) {
int k;
size_t n;
if (t < table[i].usec)
continue;
if (l <= 1)
break;
k = snprintf(p, l, "%s%llu%s", p > buf ? " " : "", (unsigned long long) (t / table[i].usec), table[i].suffix);
n = MIN((size_t) k, l);
l -= n;
p += n;
t %= table[i].usec;
}
*p = 0;
return buf;
}
bool fstype_is_network(const char *fstype) {
static const char * const table[] = {
"cifs",
"smbfs",
"ncpfs",
"nfs",
"nfs4",
"gfs",
"gfs2"
};
unsigned i;
for (i = 0; i < ELEMENTSOF(table); i++)
if (streq(table[i], fstype))
return true;
return false;
}
int chvt(int vt) {
int fd, r = 0;
if ((fd = open("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC)) < 0)
return -errno;
if (vt < 0) {
int tiocl[2] = {
TIOCL_GETKMSGREDIRECT,
0
};
if (ioctl(fd, TIOCLINUX, tiocl) < 0)
return -errno;
vt = tiocl[0] <= 0 ? 1 : tiocl[0];
}
if (ioctl(fd, VT_ACTIVATE, vt) < 0)
r = -errno;
close_nointr_nofail(r);
return r;
}
int read_one_char(FILE *f, char *ret, bool *need_nl) {
struct termios old_termios, new_termios;
char c;
char line[LINE_MAX];
assert(f);
assert(ret);
if (tcgetattr(fileno(f), &old_termios) >= 0) {
new_termios = old_termios;
new_termios.c_lflag &= ~ICANON;
new_termios.c_cc[VMIN] = 1;
new_termios.c_cc[VTIME] = 0;
if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
size_t k;
k = fread(&c, 1, 1, f);
tcsetattr(fileno(f), TCSADRAIN, &old_termios);
if (k <= 0)
return -EIO;
if (need_nl)
*need_nl = c != '\n';
*ret = c;
return 0;
}
}
if (!(fgets(line, sizeof(line), f)))
return -EIO;
truncate_nl(line);
if (strlen(line) != 1)
return -EBADMSG;
if (need_nl)
*need_nl = false;
*ret = line[0];
return 0;
}
int ask(char *ret, const char *replies, const char *text, ...) {
bool on_tty;
assert(ret);
assert(replies);
assert(text);
on_tty = isatty(STDOUT_FILENO);
for (;;) {
va_list ap;
char c;
int r;
bool need_nl = true;
if (on_tty)
fputs("\x1B[1m", stdout);
va_start(ap, text);
vprintf(text, ap);
va_end(ap);
if (on_tty)
fputs("\x1B[0m", stdout);
fflush(stdout);
if ((r = read_one_char(stdin, &c, &need_nl)) < 0) {
if (r == -EBADMSG) {
puts("Bad input, please try again.");
continue;
}
putchar('\n');
return r;
}
if (need_nl)
putchar('\n');
if (strchr(replies, c)) {
*ret = c;
return 0;
}
puts("Read unexpected character, please try again.");
}
}
int reset_terminal(int fd) {
struct termios termios;
int r = 0;
long arg;
/* Set terminal to some sane defaults */
assert(fd >= 0);
/* We leave locked terminal attributes untouched, so that
* Plymouth may set whatever it wants to set, and we don't
* interfere with that. */
/* Disable exclusive mode, just in case */
ioctl(fd, TIOCNXCL);
/* Enable console unicode mode */
arg = K_UNICODE;
ioctl(fd, KDSKBMODE, &arg);
if (tcgetattr(fd, &termios) < 0) {
r = -errno;
goto finish;
}
/* We only reset the stuff that matters to the software. How
* hardware is set up we don't touch assuming that somebody
* else will do that for us */
termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
termios.c_oflag |= ONLCR;
termios.c_cflag |= CREAD;
termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
termios.c_cc[VINTR] = 03; /* ^C */
termios.c_cc[VQUIT] = 034; /* ^\ */
termios.c_cc[VERASE] = 0177;
termios.c_cc[VKILL] = 025; /* ^X */
termios.c_cc[VEOF] = 04; /* ^D */
termios.c_cc[VSTART] = 021; /* ^Q */
termios.c_cc[VSTOP] = 023; /* ^S */
termios.c_cc[VSUSP] = 032; /* ^Z */
termios.c_cc[VLNEXT] = 026; /* ^V */
termios.c_cc[VWERASE] = 027; /* ^W */
termios.c_cc[VREPRINT] = 022; /* ^R */
termios.c_cc[VEOL] = 0;
termios.c_cc[VEOL2] = 0;
termios.c_cc[VTIME] = 0;
termios.c_cc[VMIN] = 1;
if (tcsetattr(fd, TCSANOW, &termios) < 0)
r = -errno;
finish:
/* Just in case, flush all crap out */
tcflush(fd, TCIOFLUSH);
return r;
}
int open_terminal(const char *name, int mode) {
int fd, r;
unsigned c = 0;
/*
* If a TTY is in the process of being closed opening it might
* cause EIO. This is horribly awful, but unlikely to be
* changed in the kernel. Hence we work around this problem by
* retrying a couple of times.
*
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
*/
for (;;) {
if ((fd = open(name, mode)) >= 0)
break;
if (errno != EIO)
return -errno;
if (c >= 20)
return -errno;
usleep(50 * USEC_PER_MSEC);
c++;
}
if (fd < 0)
return -errno;
if ((r = isatty(fd)) < 0) {
close_nointr_nofail(fd);
return -errno;
}
if (!r) {
close_nointr_nofail(fd);
return -ENOTTY;
}
return fd;
}
int flush_fd(int fd) {
struct pollfd pollfd;
zero(pollfd);
pollfd.fd = fd;
pollfd.events = POLLIN;
for (;;) {
char buf[LINE_MAX];
ssize_t l;
int r;
if ((r = poll(&pollfd, 1, 0)) < 0) {
if (errno == EINTR)
continue;
return -errno;
}
if (r == 0)
return 0;
if ((l = read(fd, buf, sizeof(buf))) < 0) {
if (errno == EINTR)
continue;
if (errno == EAGAIN)
return 0;
return -errno;
}
if (l <= 0)
return 0;
}
}
int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm) {
int fd = -1, notify = -1, r, wd = -1;
assert(name);
/* We use inotify to be notified when the tty is closed. We
* create the watch before checking if we can actually acquire
* it, so that we don't lose any event.
*
* Note: strictly speaking this actually watches for the
* device being closed, it does *not* really watch whether a
* tty loses its controlling process. However, unless some
* rogue process uses TIOCNOTTY on /dev/tty *after* closing
* its tty otherwise this will not become a problem. As long
* as the administrator makes sure not configure any service
* on the same tty as an untrusted user this should not be a
* problem. (Which he probably should not do anyway.) */
if (!fail && !force) {
if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
r = -errno;
goto fail;
}
if ((wd = inotify_add_watch(notify, name, IN_CLOSE)) < 0) {
r = -errno;
goto fail;
}
}
for (;;) {
if (notify >= 0)
if ((r = flush_fd(notify)) < 0)
goto fail;
/* We pass here O_NOCTTY only so that we can check the return
* value TIOCSCTTY and have a reliable way to figure out if we
* successfully became the controlling process of the tty */
if ((fd = open_terminal(name, O_RDWR|O_NOCTTY)) < 0)
return -errno;
/* First, try to get the tty */
r = ioctl(fd, TIOCSCTTY, force);
/* Sometimes it makes sense to ignore TIOCSCTTY
* returning EPERM, i.e. when very likely we already
* are have this controlling terminal. */
if (r < 0 && errno == EPERM && ignore_tiocstty_eperm)
r = 0;
if (r < 0 && (force || fail || errno != EPERM)) {
r = -errno;
goto fail;
}
if (r >= 0)
break;
assert(!fail);
assert(!force);
assert(notify >= 0);
for (;;) {
uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
ssize_t l;
struct inotify_event *e;
if ((l = read(notify, &inotify_buffer, sizeof(inotify_buffer))) < 0) {
if (errno == EINTR)
continue;
r = -errno;
goto fail;
}
e = (struct inotify_event*) inotify_buffer;
while (l > 0) {
size_t step;
if (e->wd != wd || !(e->mask & IN_CLOSE)) {
r = -EIO;
goto fail;
}
step = sizeof(struct inotify_event) + e->len;
assert(step <= (size_t) l);
e = (struct inotify_event*) ((uint8_t*) e + step);
l -= step;
}
break;
}
/* We close the tty fd here since if the old session
* ended our handle will be dead. It's important that
* we do this after sleeping, so that we don't enter
* an endless loop. */
close_nointr_nofail(fd);
}
if (notify >= 0)
close_nointr_nofail(notify);
if ((r = reset_terminal(fd)) < 0)
log_warning("Failed to reset terminal: %s", strerror(-r));
return fd;
fail:
if (fd >= 0)
close_nointr_nofail(fd);
if (notify >= 0)
close_nointr_nofail(notify);
return r;
}
int release_terminal(void) {
int r = 0, fd;
struct sigaction sa_old, sa_new;
if ((fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY)) < 0)
return -errno;
/* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
* by our own TIOCNOTTY */
zero(sa_new);
sa_new.sa_handler = SIG_IGN;
sa_new.sa_flags = SA_RESTART;
assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
if (ioctl(fd, TIOCNOTTY) < 0)
r = -errno;
assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
close_nointr_nofail(fd);
return r;
}
int sigaction_many(const struct sigaction *sa, ...) {
va_list ap;
int r = 0, sig;
va_start(ap, sa);
while ((sig = va_arg(ap, int)) > 0)
if (sigaction(sig, sa, NULL) < 0)
r = -errno;
va_end(ap);
return r;
}
int ignore_signals(int sig, ...) {
struct sigaction sa;
va_list ap;
int r = 0;
zero(sa);
sa.sa_handler = SIG_IGN;
sa.sa_flags = SA_RESTART;
if (sigaction(sig, &sa, NULL) < 0)
r = -errno;
va_start(ap, sig);
while ((sig = va_arg(ap, int)) > 0)
if (sigaction(sig, &sa, NULL) < 0)
r = -errno;
va_end(ap);
return r;
}
int default_signals(int sig, ...) {
struct sigaction sa;
va_list ap;
int r = 0;
zero(sa);
sa.sa_handler = SIG_DFL;
sa.sa_flags = SA_RESTART;
if (sigaction(sig, &sa, NULL) < 0)
r = -errno;
va_start(ap, sig);
while ((sig = va_arg(ap, int)) > 0)
if (sigaction(sig, &sa, NULL) < 0)
r = -errno;
va_end(ap);
return r;
}
int close_pipe(int p[]) {
int a = 0, b = 0;
assert(p);
if (p[0] >= 0) {
a = close_nointr(p[0]);
p[0] = -1;
}
if (p[1] >= 0) {
b = close_nointr(p[1]);
p[1] = -1;
}
return a < 0 ? a : b;
}
ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
uint8_t *p;
ssize_t n = 0;
assert(fd >= 0);
assert(buf);
p = buf;
while (nbytes > 0) {
ssize_t k;
if ((k = read(fd, p, nbytes)) <= 0) {
if (k < 0 && errno == EINTR)
continue;
if (k < 0 && errno == EAGAIN && do_poll) {
struct pollfd pollfd;
zero(pollfd);
pollfd.fd = fd;
pollfd.events = POLLIN;
if (poll(&pollfd, 1, -1) < 0) {
if (errno == EINTR)
continue;
return n > 0 ? n : -errno;
}
if (pollfd.revents != POLLIN)
return n > 0 ? n : -EIO;
continue;
}
return n > 0 ? n : (k < 0 ? -errno : 0);
}
p += k;
nbytes -= k;
n += k;
}
return n;
}
ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
const uint8_t *p;
ssize_t n = 0;
assert(fd >= 0);
assert(buf);
p = buf;
while (nbytes > 0) {
ssize_t k;
if ((k = write(fd, p, nbytes)) <= 0) {
if (k < 0 && errno == EINTR)
continue;
if (k < 0 && errno == EAGAIN && do_poll) {
struct pollfd pollfd;
zero(pollfd);
pollfd.fd = fd;
pollfd.events = POLLOUT;
if (poll(&pollfd, 1, -1) < 0) {
if (errno == EINTR)
continue;
return n > 0 ? n : -errno;
}
if (pollfd.revents != POLLOUT)
return n > 0 ? n : -EIO;
continue;
}
return n > 0 ? n : (k < 0 ? -errno : 0);
}
p += k;
nbytes -= k;
n += k;
}
return n;
}
int path_is_mount_point(const char *t) {
struct stat a, b;
char *parent;
int r;
if (lstat(t, &a) < 0) {
if (errno == ENOENT)
return 0;
return -errno;
}
if ((r = parent_of_path(t, &parent)) < 0)
return r;
r = lstat(parent, &b);
free(parent);
if (r < 0)
return -errno;
return a.st_dev != b.st_dev;
}
int parse_usec(const char *t, usec_t *usec) {
static const struct {
const char *suffix;
usec_t usec;
} table[] = {
{ "sec", USEC_PER_SEC },
{ "s", USEC_PER_SEC },
{ "min", USEC_PER_MINUTE },
{ "hr", USEC_PER_HOUR },
{ "h", USEC_PER_HOUR },
{ "d", USEC_PER_DAY },
{ "w", USEC_PER_WEEK },
{ "msec", USEC_PER_MSEC },
{ "ms", USEC_PER_MSEC },
{ "m", USEC_PER_MINUTE },
{ "usec", 1ULL },
{ "us", 1ULL },
{ "", USEC_PER_SEC },
};
const char *p;
usec_t r = 0;
assert(t);
assert(usec);
p = t;
do {
long long l;
char *e;
unsigned i;
errno = 0;
l = strtoll(p, &e, 10);
if (errno != 0)
return -errno;
if (l < 0)
return -ERANGE;
if (e == p)
return -EINVAL;
e += strspn(e, WHITESPACE);
for (i = 0; i < ELEMENTSOF(table); i++)
if (startswith(e, table[i].suffix)) {
r += (usec_t) l * table[i].usec;
p = e + strlen(table[i].suffix);
break;
}
if (i >= ELEMENTSOF(table))
return -EINVAL;
} while (*p != 0);
*usec = r;
return 0;
}
int make_stdio(int fd) {
int r, s, t;
assert(fd >= 0);
r = dup2(fd, STDIN_FILENO);
s = dup2(fd, STDOUT_FILENO);
t = dup2(fd, STDERR_FILENO);
if (fd >= 3)
close_nointr_nofail(fd);
if (r < 0 || s < 0 || t < 0)
return -errno;
return 0;
}
int make_null_stdio(void) {
int null_fd;
if ((null_fd = open("/dev/null", O_RDWR|O_NOCTTY)) < 0)
return -errno;
return make_stdio(null_fd);
}
bool is_device_path(const char *path) {
/* Returns true on paths that refer to a device, either in
* sysfs or in /dev */
return
path_startswith(path, "/dev/") ||
path_startswith(path, "/sys/");
}
int dir_is_empty(const char *path) {
DIR *d;
int r;
struct dirent buf, *de;
if (!(d = opendir(path)))
return -errno;
for (;;) {
if ((r = readdir_r(d, &buf, &de)) > 0) {
r = -r;
break;
}
if (!de) {
r = 1;
break;
}
if (!ignore_file(de->d_name)) {
r = 0;
break;
}
}
closedir(d);
return r;
}
unsigned long long random_ull(void) {
int fd;
uint64_t ull;
ssize_t r;
if ((fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0)
goto fallback;
r = loop_read(fd, &ull, sizeof(ull), true);
close_nointr_nofail(fd);
if (r != sizeof(ull))
goto fallback;
return ull;
fallback:
return random() * RAND_MAX + random();
}
void rename_process(const char name[8]) {
assert(name);
prctl(PR_SET_NAME, name);
/* This is a like a poor man's setproctitle(). The string
* passed should fit in 7 chars (i.e. the length of
* "systemd") */
if (program_invocation_name)
strncpy(program_invocation_name, name, strlen(program_invocation_name));
}
void sigset_add_many(sigset_t *ss, ...) {
va_list ap;
int sig;
assert(ss);
va_start(ap, ss);
while ((sig = va_arg(ap, int)) > 0)
assert_se(sigaddset(ss, sig) == 0);
va_end(ap);
}
char* gethostname_malloc(void) {
struct utsname u;
assert_se(uname(&u) >= 0);
if (u.nodename[0])
return strdup(u.nodename);
return strdup(u.sysname);
}
char* getlogname_malloc(void) {
uid_t uid;
long bufsize;
char *buf, *name;
struct passwd pwbuf, *pw = NULL;
struct stat st;
if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0)
uid = st.st_uid;
else
uid = getuid();
/* Shortcut things to avoid NSS lookups */
if (uid == 0)
return strdup("root");
if ((bufsize = sysconf(_SC_GETPW_R_SIZE_MAX)) <= 0)
bufsize = 4096;
if (!(buf = malloc(bufsize)))
return NULL;
if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw) {
name = strdup(pw->pw_name);
free(buf);
return name;
}
free(buf);
if (asprintf(&name, "%lu", (unsigned long) uid) < 0)
return NULL;
return name;
}
int getttyname_malloc(int fd, char **r) {
char path[PATH_MAX], *c;
int k;
assert(r);
if ((k = ttyname_r(fd, path, sizeof(path))) != 0)
return -k;
char_array_0(path);
if (!(c = strdup(startswith(path, "/dev/") ? path + 5 : path)))
return -ENOMEM;
*r = c;
return 0;
}
int getttyname_harder(int fd, char **r) {
int k;
char *s;
if ((k = getttyname_malloc(fd, &s)) < 0)
return k;
if (streq(s, "tty")) {
free(s);
return get_ctty(r, NULL);
}
*r = s;
return 0;
}
int get_ctty_devnr(dev_t *d) {
int k;
char line[LINE_MAX], *p;
unsigned long ttynr;
FILE *f;
if (!(f = fopen("/proc/self/stat", "r")))
return -errno;
if (!(fgets(line, sizeof(line), f))) {
k = -errno;
fclose(f);
return k;
}
fclose(f);
if (!(p = strrchr(line, ')')))
return -EIO;
p++;
if (sscanf(p, " "
"%*c " /* state */
"%*d " /* ppid */
"%*d " /* pgrp */
"%*d " /* session */
"%lu ", /* ttynr */
&ttynr) != 1)
return -EIO;
*d = (dev_t) ttynr;
return 0;
}
int get_ctty(char **r, dev_t *_devnr) {
int k;
char fn[PATH_MAX], *s, *b, *p;
dev_t devnr;
assert(r);
if ((k = get_ctty_devnr(&devnr)) < 0)
return k;
snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr));
char_array_0(fn);
if ((k = readlink_malloc(fn, &s)) < 0) {
if (k != -ENOENT)
return k;
/* This is an ugly hack */
if (major(devnr) == 136) {
if (asprintf(&b, "pts/%lu", (unsigned long) minor(devnr)) < 0)
return -ENOMEM;
*r = b;
if (_devnr)
*_devnr = devnr;
return 0;
}
/* Probably something like the ptys which have no
* symlink in /dev/char. Let's return something
* vaguely useful. */
if (!(b = strdup(fn + 5)))
return -ENOMEM;
*r = b;
if (_devnr)
*_devnr = devnr;
return 0;
}
if (startswith(s, "/dev/"))
p = s + 5;
else if (startswith(s, "../"))
p = s + 3;
else
p = s;
b = strdup(p);
free(s);
if (!b)
return -ENOMEM;
*r = b;
if (_devnr)
*_devnr = devnr;
return 0;
}
static int rm_rf_children(int fd, bool only_dirs) {
DIR *d;
int ret = 0;
assert(fd >= 0);
/* This returns the first error we run into, but nevertheless
* tries to go on */
if (!(d = fdopendir(fd))) {
close_nointr_nofail(fd);
return errno == ENOENT ? 0 : -errno;
}
for (;;) {
struct dirent buf, *de;
bool is_dir;
int r;
if ((r = readdir_r(d, &buf, &de)) != 0) {
if (ret == 0)
ret = -r;
break;
}
if (!de)
break;
if (streq(de->d_name, ".") || streq(de->d_name, ".."))
continue;
if (de->d_type == DT_UNKNOWN) {
struct stat st;
if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
if (ret == 0 && errno != ENOENT)
ret = -errno;
continue;
}
is_dir = S_ISDIR(st.st_mode);
} else
is_dir = de->d_type == DT_DIR;
if (is_dir) {
int subdir_fd;
if ((subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
if (ret == 0 && errno != ENOENT)
ret = -errno;
continue;
}
if ((r = rm_rf_children(subdir_fd, only_dirs)) < 0) {
if (ret == 0)
ret = r;
}
if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
if (ret == 0 && errno != ENOENT)
ret = -errno;
}
} else if (!only_dirs) {
if (unlinkat(fd, de->d_name, 0) < 0) {
if (ret == 0 && errno != ENOENT)
ret = -errno;
}
}
}
closedir(d);
return ret;
}
int rm_rf(const char *path, bool only_dirs, bool delete_root) {
int fd;
int r;
assert(path);
if ((fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC)) < 0) {
if (errno != ENOTDIR)
return -errno;
if (delete_root && !only_dirs)
if (unlink(path) < 0)
return -errno;
return 0;
}
r = rm_rf_children(fd, only_dirs);
if (delete_root)
if (rmdir(path) < 0) {
if (r == 0)
r = -errno;
}
return r;
}
int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
assert(path);
/* Under the assumption that we are running privileged we
* first change the access mode and only then hand out
* ownership to avoid a window where access is too open. */
if (chmod(path, mode) < 0)
return -errno;
if (chown(path, uid, gid) < 0)
return -errno;
return 0;
}
cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
cpu_set_t *r;
unsigned n = 1024;
/* Allocates the cpuset in the right size */
for (;;) {
if (!(r = CPU_ALLOC(n)))
return NULL;
if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
if (ncpus)
*ncpus = n;
return r;
}
CPU_FREE(r);
if (errno != EINVAL)
return NULL;
n *= 2;
}
}
void status_vprintf(const char *format, va_list ap) {
char *s = NULL;
int fd = -1;
assert(format);
/* This independent of logging, as status messages are
* optional and go exclusively to the console. */
if (vasprintf(&s, format, ap) < 0)
goto finish;
if ((fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0)
goto finish;
write(fd, s, strlen(s));
finish:
free(s);
if (fd >= 0)
close_nointr_nofail(fd);
}
void status_printf(const char *format, ...) {
va_list ap;
assert(format);
va_start(ap, format);
status_vprintf(format, ap);
va_end(ap);
}
void status_welcome(void) {
char *pretty_name = NULL, *ansi_color = NULL;
const char *const_pretty = NULL, *const_color = NULL;
int r;
if ((r = parse_env_file("/etc/os-release", NEWLINE,
"PRETTY_NAME", &pretty_name,
"ANSI_COLOR", &ansi_color,
NULL)) < 0) {
if (r != -ENOENT)
log_warning("Failed to read /etc/os-release: %s", strerror(-r));
}
#if defined(TARGET_FEDORA)
if (!pretty_name) {
if ((r = read_one_line_file("/etc/system-release", &pretty_name)) < 0) {
if (r != -ENOENT)
log_warning("Failed to read /etc/system-release: %s", strerror(-r));
}
}
if (!ansi_color && pretty_name) {
/* This tries to mimic the color magic the old Red Hat sysinit
* script did. */
if (startswith(pretty_name, "Red Hat"))
const_color = "0;31"; /* Red for RHEL */
else if (startswith(pretty_name, "Fedora"))
const_color = "0;34"; /* Blue for Fedora */
}
#elif defined(TARGET_SUSE)
if (!pretty_name) {
if ((r = read_one_line_file("/etc/SuSE-release", &pretty_name)) < 0) {
if (r != -ENOENT)
log_warning("Failed to read /etc/SuSE-release: %s", strerror(-r));
}
}
if (!ansi_color)
const_color = "0;32"; /* Green for openSUSE */
#elif defined(TARGET_GENTOO)
if (!pretty_name) {
if ((r = read_one_line_file("/etc/gentoo-release", &pretty_name)) < 0) {
if (r != -ENOENT)
log_warning("Failed to read /etc/gentoo-release: %s", strerror(-r));
}
}
if (!ansi_color)
const_color = "1;34"; /* Light Blue for Gentoo */
#elif defined(TARGET_ALTLINUX)
if (!pretty_name) {
if ((r = read_one_line_file("/etc/altlinux-release", &pretty_name)) < 0) {
if (r != -ENOENT)
log_warning("Failed to read /etc/altlinux-release: %s", strerror(-r));
}
}
if (!ansi_color)
const_color = "0;36"; /* Cyan for ALTLinux */
#elif defined(TARGET_DEBIAN)
if (!pretty_name) {
char *version;
if ((r = read_one_line_file("/etc/debian_version", &version)) < 0) {
if (r != -ENOENT)
log_warning("Failed to read /etc/debian_version: %s", strerror(-r));
} else {
pretty_name = strappend("Debian ", version);
free(version);
if (!pretty_name)
log_warning("Failed to allocate Debian version string.");
}
}
if (!ansi_color)
const_color = "1;31"; /* Light Red for Debian */
#elif defined(TARGET_UBUNTU)
if ((r = parse_env_file("/etc/lsb-release", NEWLINE,
"DISTRIB_DESCRIPTION", &pretty_name,
NULL)) < 0) {
if (r != -ENOENT)
log_warning("Failed to read /etc/lsb-release: %s", strerror(-r));
}
if (!ansi_color)
const_color = "0;33"; /* Orange/Brown for Ubuntu */
#elif defined(TARGET_MANDRIVA)
if (!pretty_name) {
char *s, *p;
if ((r = read_one_line_file("/etc/mandriva-release", &s) < 0)) {
if (r != -ENOENT)
log_warning("Failed to read /etc/mandriva-release: %s", strerror(-r));
} else {
p = strstr(s, " release ");
if (p) {
*p = '\0';
p += 9;
p[strcspn(p, " ")] = '\0';
/* This corresponds to standard rc.sysinit */
if (asprintf(&pretty_name, "%s\x1B[0;39m %s", s, p) > 0)
const_color = "1;36";
else
log_warning("Failed to allocate Mandriva version string.");
} else
log_warning("Failed to parse /etc/mandriva-release");
free(s);
}
}
#elif defined(TARGET_MEEGO)
if (!pretty_name) {
if ((r = read_one_line_file("/etc/meego-release", &pretty_name)) < 0) {
if (r != -ENOENT)
log_warning("Failed to read /etc/meego-release: %s", strerror(-r));
}
}
if (!ansi_color)
const_color = "1;35"; /* Bright Magenta for MeeGo */
#endif
if (!pretty_name && !const_pretty)
const_pretty = "Linux";
if (!ansi_color && !const_color)
const_color = "1";
status_printf("\nWelcome to \x1B[%sm%s\x1B[0m!\n\n",
const_color ? const_color : ansi_color,
const_pretty ? const_pretty : pretty_name);
free(ansi_color);
free(pretty_name);
}
char *replace_env(const char *format, char **env) {
enum {
WORD,
CURLY,
VARIABLE
} state = WORD;
const char *e, *word = format;
char *r = NULL, *k;
assert(format);
for (e = format; *e; e ++) {
switch (state) {
case WORD:
if (*e == '$')
state = CURLY;
break;
case CURLY:
if (*e == '{') {
if (!(k = strnappend(r, word, e-word-1)))
goto fail;
free(r);
r = k;
word = e-1;
state = VARIABLE;
} else if (*e == '$') {
if (!(k = strnappend(r, word, e-word)))
goto fail;
free(r);
r = k;
word = e+1;
state = WORD;
} else
state = WORD;
break;
case VARIABLE:
if (*e == '}') {
const char *t;
if (!(t = strv_env_get_with_length(env, word+2, e-word-2)))
t = "";
if (!(k = strappend(r, t)))
goto fail;
free(r);
r = k;
word = e+1;
state = WORD;
}
break;
}
}
if (!(k = strnappend(r, word, e-word)))
goto fail;
free(r);
return k;
fail:
free(r);
return NULL;
}
char **replace_env_argv(char **argv, char **env) {
char **r, **i;
unsigned k = 0, l = 0;
l = strv_length(argv);
if (!(r = new(char*, l+1)))
return NULL;
STRV_FOREACH(i, argv) {
/* If $FOO appears as single word, replace it by the split up variable */
if ((*i)[0] == '$' && (*i)[1] != '{') {
char *e;
char **w, **m;
unsigned q;
if ((e = strv_env_get(env, *i+1))) {
if (!(m = strv_split_quoted(e))) {
r[k] = NULL;
strv_free(r);
return NULL;
}
} else
m = NULL;
q = strv_length(m);
l = l + q - 1;
if (!(w = realloc(r, sizeof(char*) * (l+1)))) {
r[k] = NULL;
strv_free(r);
strv_free(m);
return NULL;
}
r = w;
if (m) {
memcpy(r + k, m, q * sizeof(char*));
free(m);
}
k += q;
continue;
}
/* If ${FOO} appears as part of a word, replace it by the variable as-is */
if (!(r[k++] = replace_env(*i, env))) {
strv_free(r);
return NULL;
}
}
r[k] = NULL;
return r;
}
int columns(void) {
static __thread int parsed_columns = 0;
const char *e;
if (parsed_columns > 0)
return parsed_columns;
if ((e = getenv("COLUMNS")))
parsed_columns = atoi(e);
if (parsed_columns <= 0) {
struct winsize ws;
zero(ws);
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) >= 0)
parsed_columns = ws.ws_col;
}
if (parsed_columns <= 0)
parsed_columns = 80;
return parsed_columns;
}
int running_in_chroot(void) {
struct stat a, b;
zero(a);
zero(b);
/* Only works as root */
if (stat("/proc/1/root", &a) < 0)
return -errno;
if (stat("/", &b) < 0)
return -errno;
return
a.st_dev != b.st_dev ||
a.st_ino != b.st_ino;
}
char *ellipsize(const char *s, unsigned length, unsigned percent) {
size_t l, x;
char *r;
assert(s);
assert(percent <= 100);
assert(length >= 3);
l = strlen(s);
if (l <= 3 || l <= length)
return strdup(s);
if (!(r = new0(char, length+1)))
return r;
x = (length * percent) / 100;
if (x > length - 3)
x = length - 3;
memcpy(r, s, x);
r[x] = '.';
r[x+1] = '.';
r[x+2] = '.';
memcpy(r + x + 3,
s + l - (length - x - 3),
length - x - 3);
return r;
}
int touch(const char *path) {
int fd;
assert(path);
if ((fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0644)) < 0)
return -errno;
close_nointr_nofail(fd);
return 0;
}
char *unquote(const char *s, const char* quotes) {
size_t l;
assert(s);
if ((l = strlen(s)) < 2)
return strdup(s);
if (strchr(quotes, s[0]) && s[l-1] == s[0])
return strndup(s+1, l-2);
return strdup(s);
}
char *normalize_env_assignment(const char *s) {
char *name, *value, *p, *r;
p = strchr(s, '=');
if (!p) {
if (!(r = strdup(s)))
return NULL;
return strstrip(r);
}
if (!(name = strndup(s, p - s)))
return NULL;
if (!(p = strdup(p+1))) {
free(name);
return NULL;
}
value = unquote(strstrip(p), QUOTES);
free(p);
if (!value) {
free(name);
return NULL;
}
if (asprintf(&r, "%s=%s", name, value) < 0)
r = NULL;
free(value);
free(name);
return r;
}
int wait_for_terminate(pid_t pid, siginfo_t *status) {
assert(pid >= 1);
assert(status);
for (;;) {
zero(*status);
if (waitid(P_PID, pid, status, WEXITED) < 0) {
if (errno == EINTR)
continue;
return -errno;
}
return 0;
}
}
int wait_for_terminate_and_warn(const char *name, pid_t pid) {
int r;
siginfo_t status;
assert(name);
assert(pid > 1);
if ((r = wait_for_terminate(pid, &status)) < 0) {
log_warning("Failed to wait for %s: %s", name, strerror(-r));
return r;
}
if (status.si_code == CLD_EXITED) {
if (status.si_status != 0) {
log_warning("%s failed with error code %i.", name, status.si_status);
return status.si_status;
}
log_debug("%s succeeded.", name);
return 0;
} else if (status.si_code == CLD_KILLED ||
status.si_code == CLD_DUMPED) {
log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
return -EPROTO;
}
log_warning("%s failed due to unknown reason.", name);
return -EPROTO;
}
void freeze(void) {
/* Make sure nobody waits for us on a socket anymore */
close_all_fds(NULL, 0);
sync();
for (;;)
pause();
}
bool null_or_empty(struct stat *st) {
assert(st);
if (S_ISREG(st->st_mode) && st->st_size <= 0)
return true;
if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
return true;
return false;
}
DIR *xopendirat(int fd, const char *name, int flags) {
int nfd;
DIR *d;
if ((nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags)) < 0)
return NULL;
if (!(d = fdopendir(nfd))) {
close_nointr_nofail(nfd);
return NULL;
}
return d;
}
int signal_from_string_try_harder(const char *s) {
int signo;
assert(s);
if ((signo = signal_from_string(s)) <= 0)
if (startswith(s, "SIG"))
return signal_from_string(s+3);
return signo;
}
void dual_timestamp_serialize(FILE *f, const char *name, dual_timestamp *t) {
assert(f);
assert(name);
assert(t);
if (!dual_timestamp_is_set(t))
return;
fprintf(f, "%s=%llu %llu\n",
name,
(unsigned long long) t->realtime,
(unsigned long long) t->monotonic);
}
void dual_timestamp_deserialize(const char *value, dual_timestamp *t) {
unsigned long long a, b;
assert(value);
assert(t);
if (sscanf(value, "%lli %llu", &a, &b) != 2)
log_debug("Failed to parse finish timestamp value %s", value);
else {
t->realtime = a;
t->monotonic = b;
}
}
char *fstab_node_to_udev_node(const char *p) {
char *dn, *t, *u;
int r;
/* FIXME: to follow udev's logic 100% we need to leave valid
* UTF8 chars unescaped */
if (startswith(p, "LABEL=")) {
if (!(u = unquote(p+6, "\"\'")))
return NULL;
t = xescape(u, "/ ");
free(u);
if (!t)
return NULL;
r = asprintf(&dn, "/dev/disk/by-label/%s", t);
free(t);
if (r < 0)
return NULL;
return dn;
}
if (startswith(p, "UUID=")) {
if (!(u = unquote(p+5, "\"\'")))
return NULL;
t = xescape(u, "/ ");
free(u);
if (!t)
return NULL;
r = asprintf(&dn, "/dev/disk/by-uuid/%s", t);
free(t);
if (r < 0)
return NULL;
return dn;
}
return strdup(p);
}
void filter_environ(const char *prefix) {
int i, j;
assert(prefix);
if (!environ)
return;
for (i = 0, j = 0; environ[i]; i++) {
if (startswith(environ[i], prefix))
continue;
environ[j++] = environ[i];
}
environ[j] = NULL;
}
bool tty_is_vc(const char *tty) {
assert(tty);
if (startswith(tty, "/dev/"))
tty += 5;
return startswith(tty, "tty") &&
tty[3] >= '0' && tty[3] <= '9';
}
const char *default_term_for_tty(const char *tty) {
char *active = NULL;
const char *term;
assert(tty);
if (startswith(tty, "/dev/"))
tty += 5;
/* Resolve where /dev/console is pointing when determining
* TERM */
if (streq(tty, "console"))
if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
/* If multiple log outputs are configured the
* last one is what /dev/console points to */
if ((tty = strrchr(active, ' ')))
tty++;
else
tty = active;
}
term = tty_is_vc(tty) ? "TERM=linux" : "TERM=vt100";
free(active);
return term;
}
/* Returns a short identifier for the various VM implementations */
int detect_vm(const char **id) {
#if defined(__i386__) || defined(__x86_64__)
/* Both CPUID and DMI are x86 specific interfaces... */
static const char *const dmi_vendors[] = {
"/sys/class/dmi/id/sys_vendor",
"/sys/class/dmi/id/board_vendor",
"/sys/class/dmi/id/bios_vendor"
};
static const char dmi_vendor_table[] =
"QEMU\0" "qemu\0"
/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
"VMware\0" "vmware\0"
"VMW\0" "vmware\0"
"Microsoft Corporation\0" "microsoft\0"
"innotek GmbH\0" "oracle\0"
"Xen\0" "xen\0"
"Bochs\0" "bochs\0";
static const char cpuid_vendor_table[] =
"XenVMMXenVMM\0" "xen\0"
"KVMKVMKVM\0" "kvm\0"
/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
"VMwareVMware\0" "vmware\0"
/* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
"Microsoft Hv\0" "microsoft\0";
uint32_t eax, ecx;
union {
uint32_t sig32[3];
char text[13];
} sig;
unsigned i;
const char *j, *k;
bool hypervisor;
/* http://lwn.net/Articles/301888/ */
zero(sig);
#if defined (__i386__)
#define REG_a "eax"
#define REG_b "ebx"
#elif defined (__amd64__)
#define REG_a "rax"
#define REG_b "rbx"
#endif
/* First detect whether there is a hypervisor */
eax = 1;
__asm__ __volatile__ (
/* ebx/rbx is being used for PIC! */
" push %%"REG_b" \n\t"
" cpuid \n\t"
" pop %%"REG_b" \n\t"
: "=a" (eax), "=c" (ecx)
: "0" (eax)
);
hypervisor = !!(ecx & ecx & 0x80000000U);
if (hypervisor) {
/* There is a hypervisor, see what it is */
eax = 0x40000000U;
__asm__ __volatile__ (
/* ebx/rbx is being used for PIC! */
" push %%"REG_b" \n\t"
" cpuid \n\t"
" mov %%ebx, %1 \n\t"
" pop %%"REG_b" \n\t"
: "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
: "0" (eax)
);
NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
if (streq(sig.text, j)) {
if (id)
*id = k;
return 1;
}
}
for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
char *s;
int r;
const char *found = NULL;
if ((r = read_one_line_file(dmi_vendors[i], &s)) < 0) {
if (r != -ENOENT)
return r;
continue;
}
NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
if (startswith(s, j))
found = k;
free(s);
if (found) {
if (id)
*id = found;
return 1;
}
}
if (hypervisor) {
if (id)
*id = "other";
return 1;
}
#endif
return 0;
}
int detect_container(const char **id) {
FILE *f;
/* Unfortunately many of these operations require root access
* in one way or another */
if (geteuid() != 0)
return -EPERM;
if (running_in_chroot() > 0) {
if (id)
*id = "chroot";
return 1;
}
/* /proc/vz exists in container and outside of the container,
* /proc/bc only outside of the container. */
if (access("/proc/vz", F_OK) >= 0 &&
access("/proc/bc", F_OK) < 0) {
if (id)
*id = "openvz";
return 1;
}
if ((f = fopen("/proc/self/cgroup", "r"))) {
for (;;) {
char line[LINE_MAX], *p;
if (!fgets(line, sizeof(line), f))
break;
if (!(p = strchr(strstrip(line), ':')))
continue;
if (strncmp(p, ":ns:", 4))
continue;
if (!streq(p, ":ns:/")) {
fclose(f);
if (id)
*id = "pidns";
return 1;
}
}
fclose(f);
}
return 0;
}
/* Returns a short identifier for the various VM/container implementations */
int detect_virtualization(const char **id) {
static __thread const char *cached_id = NULL;
const char *_id;
int r;
if (cached_id) {
if (cached_id == (const char*) -1)
return 0;
if (id)
*id = cached_id;
return 1;
}
if ((r = detect_container(&_id)) != 0)
goto finish;
r = detect_vm(&_id);
finish:
if (r > 0) {
cached_id = _id;
if (id)
*id = _id;
} else if (r == 0)
cached_id = (const char*) -1;
return r;
}
void execute_directory(const char *directory, DIR *d, char *argv[]) {
DIR *_d = NULL;
struct dirent *de;
Hashmap *pids = NULL;
assert(directory);
/* Executes all binaries in a directory in parallel and waits
* until all they all finished. */
if (!d) {
if (!(_d = opendir(directory))) {
if (errno == ENOENT)
return;
log_error("Failed to enumerate directory %s: %m", directory);
return;
}
d = _d;
}
if (!(pids = hashmap_new(trivial_hash_func, trivial_compare_func))) {
log_error("Failed to allocate set.");
goto finish;
}
while ((de = readdir(d))) {
char *path;
pid_t pid;
int k;
if (ignore_file(de->d_name))
continue;
if (de->d_type != DT_REG &&
de->d_type != DT_LNK &&
de->d_type != DT_UNKNOWN)
continue;
if (asprintf(&path, "%s/%s", directory, de->d_name) < 0) {
log_error("Out of memory");
continue;
}
if ((pid = fork()) < 0) {
log_error("Failed to fork: %m");
free(path);
continue;
}
if (pid == 0) {
char *_argv[2];
/* Child */
if (!argv) {
_argv[0] = path;
_argv[1] = NULL;
argv = _argv;
} else
if (!argv[0])
argv[0] = path;
execv(path, argv);
log_error("Failed to execute %s: %m", path);
_exit(EXIT_FAILURE);
}
log_debug("Spawned %s as %lu", path, (unsigned long) pid);
if ((k = hashmap_put(pids, UINT_TO_PTR(pid), path)) < 0) {
log_error("Failed to add PID to set: %s", strerror(-k));
free(path);
}
}
while (!hashmap_isempty(pids)) {
siginfo_t si;
char *path;
zero(si);
if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
if (errno == EINTR)
continue;
log_error("waitid() failed: %m");
goto finish;
}
if ((path = hashmap_remove(pids, UINT_TO_PTR(si.si_pid)))) {
if (!is_clean_exit(si.si_code, si.si_status)) {
if (si.si_code == CLD_EXITED)
log_error("%s exited with exit status %i.", path, si.si_status);
else
log_error("%s terminated by signal %s.", path, signal_to_string(si.si_status));
} else
log_debug("%s exited successfully.", path);
free(path);
}
}
finish:
if (_d)
closedir(_d);
if (pids)
hashmap_free_free(pids);
}
int kill_and_sigcont(pid_t pid, int sig) {
int r;
r = kill(pid, sig) < 0 ? -errno : 0;
if (r >= 0)
kill(pid, SIGCONT);
return r;
}
bool nulstr_contains(const char*nulstr, const char *needle) {
const char *i;
if (!nulstr)
return false;
NULSTR_FOREACH(i, nulstr)
if (streq(i, needle))
return true;
return false;
}
bool plymouth_running(void) {
return access("/run/plymouth/pid", F_OK) >= 0;
}
void parse_syslog_priority(char **p, int *priority) {
int a = 0, b = 0, c = 0;
int k;
assert(p);
assert(*p);
assert(priority);
if ((*p)[0] != '<')
return;
if (!strchr(*p, '>'))
return;
if ((*p)[2] == '>') {
c = undecchar((*p)[1]);
k = 3;
} else if ((*p)[3] == '>') {
b = undecchar((*p)[1]);
c = undecchar((*p)[2]);
k = 4;
} else if ((*p)[4] == '>') {
a = undecchar((*p)[1]);
b = undecchar((*p)[2]);
c = undecchar((*p)[3]);
k = 5;
} else
return;
if (a < 0 || b < 0 || c < 0)
return;
*priority = a*100+b*10+c;
*p += k;
}
int have_effective_cap(int value) {
cap_t cap;
cap_flag_value_t fv;
int r;
if (!(cap = cap_get_proc()))
return -errno;
if (cap_get_flag(cap, value, CAP_EFFECTIVE, &fv) < 0)
r = -errno;
else
r = fv == CAP_SET;
cap_free(cap);
return r;
}
char* strshorten(char *s, size_t l) {
assert(s);
if (l < strlen(s))
s[l] = 0;
return s;
}
static bool hostname_valid_char(char c) {
return
(c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
(c >= '0' && c <= '9') ||
c == '-' ||
c == '_' ||
c == '.';
}
bool hostname_is_valid(const char *s) {
const char *p;
if (isempty(s))
return false;
for (p = s; *p; p++)
if (!hostname_valid_char(*p))
return false;
if (p-s > HOST_NAME_MAX)
return false;
return true;
}
char* hostname_cleanup(char *s) {
char *p, *d;
for (p = s, d = s; *p; p++)
if ((*p >= 'a' && *p <= 'z') ||
(*p >= 'A' && *p <= 'Z') ||
(*p >= '0' && *p <= '9') ||
*p == '-' ||
*p == '_' ||
*p == '.')
*(d++) = *p;
*d = 0;
strshorten(s, HOST_NAME_MAX);
return s;
}
static const char *const ioprio_class_table[] = {
[IOPRIO_CLASS_NONE] = "none",
[IOPRIO_CLASS_RT] = "realtime",
[IOPRIO_CLASS_BE] = "best-effort",
[IOPRIO_CLASS_IDLE] = "idle"
};
DEFINE_STRING_TABLE_LOOKUP(ioprio_class, int);
static const char *const sigchld_code_table[] = {
[CLD_EXITED] = "exited",
[CLD_KILLED] = "killed",
[CLD_DUMPED] = "dumped",
[CLD_TRAPPED] = "trapped",
[CLD_STOPPED] = "stopped",
[CLD_CONTINUED] = "continued",
};
DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
[LOG_FAC(LOG_KERN)] = "kern",
[LOG_FAC(LOG_USER)] = "user",
[LOG_FAC(LOG_MAIL)] = "mail",
[LOG_FAC(LOG_DAEMON)] = "daemon",
[LOG_FAC(LOG_AUTH)] = "auth",
[LOG_FAC(LOG_SYSLOG)] = "syslog",
[LOG_FAC(LOG_LPR)] = "lpr",
[LOG_FAC(LOG_NEWS)] = "news",
[LOG_FAC(LOG_UUCP)] = "uucp",
[LOG_FAC(LOG_CRON)] = "cron",
[LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
[LOG_FAC(LOG_FTP)] = "ftp",
[LOG_FAC(LOG_LOCAL0)] = "local0",
[LOG_FAC(LOG_LOCAL1)] = "local1",
[LOG_FAC(LOG_LOCAL2)] = "local2",
[LOG_FAC(LOG_LOCAL3)] = "local3",
[LOG_FAC(LOG_LOCAL4)] = "local4",
[LOG_FAC(LOG_LOCAL5)] = "local5",
[LOG_FAC(LOG_LOCAL6)] = "local6",
[LOG_FAC(LOG_LOCAL7)] = "local7"
};
DEFINE_STRING_TABLE_LOOKUP(log_facility_unshifted, int);
static const char *const log_level_table[] = {
[LOG_EMERG] = "emerg",
[LOG_ALERT] = "alert",
[LOG_CRIT] = "crit",
[LOG_ERR] = "err",
[LOG_WARNING] = "warning",
[LOG_NOTICE] = "notice",
[LOG_INFO] = "info",
[LOG_DEBUG] = "debug"
};
DEFINE_STRING_TABLE_LOOKUP(log_level, int);
static const char* const sched_policy_table[] = {
[SCHED_OTHER] = "other",
[SCHED_BATCH] = "batch",
[SCHED_IDLE] = "idle",
[SCHED_FIFO] = "fifo",
[SCHED_RR] = "rr"
};
DEFINE_STRING_TABLE_LOOKUP(sched_policy, int);
static const char* const rlimit_table[] = {
[RLIMIT_CPU] = "LimitCPU",
[RLIMIT_FSIZE] = "LimitFSIZE",
[RLIMIT_DATA] = "LimitDATA",
[RLIMIT_STACK] = "LimitSTACK",
[RLIMIT_CORE] = "LimitCORE",
[RLIMIT_RSS] = "LimitRSS",
[RLIMIT_NOFILE] = "LimitNOFILE",
[RLIMIT_AS] = "LimitAS",
[RLIMIT_NPROC] = "LimitNPROC",
[RLIMIT_MEMLOCK] = "LimitMEMLOCK",
[RLIMIT_LOCKS] = "LimitLOCKS",
[RLIMIT_SIGPENDING] = "LimitSIGPENDING",
[RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
[RLIMIT_NICE] = "LimitNICE",
[RLIMIT_RTPRIO] = "LimitRTPRIO",
[RLIMIT_RTTIME] = "LimitRTTIME"
};
DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
static const char* const ip_tos_table[] = {
[IPTOS_LOWDELAY] = "low-delay",
[IPTOS_THROUGHPUT] = "throughput",
[IPTOS_RELIABILITY] = "reliability",
[IPTOS_LOWCOST] = "low-cost",
};
DEFINE_STRING_TABLE_LOOKUP(ip_tos, int);
static const char *const signal_table[] = {
[SIGHUP] = "HUP",
[SIGINT] = "INT",
[SIGQUIT] = "QUIT",
[SIGILL] = "ILL",
[SIGTRAP] = "TRAP",
[SIGABRT] = "ABRT",
[SIGBUS] = "BUS",
[SIGFPE] = "FPE",
[SIGKILL] = "KILL",
[SIGUSR1] = "USR1",
[SIGSEGV] = "SEGV",
[SIGUSR2] = "USR2",
[SIGPIPE] = "PIPE",
[SIGALRM] = "ALRM",
[SIGTERM] = "TERM",
#ifdef SIGSTKFLT
[SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */
#endif
[SIGCHLD] = "CHLD",
[SIGCONT] = "CONT",
[SIGSTOP] = "STOP",
[SIGTSTP] = "TSTP",
[SIGTTIN] = "TTIN",
[SIGTTOU] = "TTOU",
[SIGURG] = "URG",
[SIGXCPU] = "XCPU",
[SIGXFSZ] = "XFSZ",
[SIGVTALRM] = "VTALRM",
[SIGPROF] = "PROF",
[SIGWINCH] = "WINCH",
[SIGIO] = "IO",
[SIGPWR] = "PWR",
[SIGSYS] = "SYS"
};
DEFINE_STRING_TABLE_LOOKUP(signal, int);
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