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conf: simplify tty handling

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Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2018-05-26 12:53:56 +02:00
parent 448d7b0c0f
commit 885766f5d2
No known key found for this signature in database
GPG Key ID: 8EB056D53EECB12D
7 changed files with 67 additions and 52 deletions
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45
src/lxc/conf.c
View File

@ -835,7 +835,7 @@ static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs)
}
/* Build a space-separate list of ptys to pass to systemd. */
static bool append_ptyname(char **pp, char *name)
static bool append_ttyname(char **pp, char *name)
{
char *p;
@ -863,13 +863,13 @@ static int lxc_setup_ttys(struct lxc_conf *conf)
{
int i, ret;
const struct lxc_tty_info *ttys = &conf->ttys;
char *ttydir = conf->ttydir;
char *ttydir = ttys->dir;
char path[MAXPATHLEN], lxcpath[MAXPATHLEN];
if (!conf->rootfs.path)
return 0;
for (i = 0; i < ttys->nbtty; i++) {
for (i = 0; i < ttys->max; i++) {
struct lxc_terminal_info *tty = &ttys->tty[i];
ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1);
@ -942,13 +942,13 @@ static int lxc_setup_ttys(struct lxc_conf *conf)
path);
}
if (!append_ptyname(&conf->pty_names, tty->name)) {
if (!append_ttyname(&conf->ttys.tty_names, tty->name)) {
ERROR("Error setting up container_ttys string");
return -1;
}
}
INFO("Finished setting up %d /dev/tty<N> device(s)", ttys->nbtty);
INFO("Finished setting up %zu /dev/tty<N> device(s)", ttys->max);
return 0;
}
@ -958,21 +958,21 @@ int lxc_allocate_ttys(const char *name, struct lxc_conf *conf)
struct lxc_tty_info *ttys = &conf->ttys;
/* no tty in the configuration */
if (!conf->tty)
if (ttys->max == 0)
return 0;
ttys->tty = malloc(sizeof(*ttys->tty) * conf->tty);
ttys->tty = malloc(sizeof(*ttys->tty) * ttys->max);
if (!ttys->tty)
return -ENOMEM;
for (i = 0; i < conf->tty; i++) {
for (i = 0; i < ttys->max; i++) {
struct lxc_terminal_info *tty = &ttys->tty[i];
ret = openpty(&tty->master, &tty->slave,
tty->name, NULL, NULL);
if (ret) {
SYSERROR("Failed to create tty %d", i);
ttys->nbtty = i;
ttys->max = i;
lxc_delete_tty(ttys);
return -ENOTTY;
}
@ -996,9 +996,7 @@ int lxc_allocate_ttys(const char *name, struct lxc_conf *conf)
tty->busy = 0;
}
ttys->nbtty = conf->tty;
INFO("Finished creating %d tty devices", conf->tty);
INFO("Finished creating %zu tty devices", ttys->max);
return 0;
}
@ -1006,7 +1004,7 @@ void lxc_delete_tty(struct lxc_tty_info *ttys)
{
int i;
for (i = 0; i < ttys->nbtty; i++) {
for (i = 0; i < ttys->max; i++) {
struct lxc_terminal_info *tty = &ttys->tty[i];
close(tty->master);
@ -1015,7 +1013,6 @@ void lxc_delete_tty(struct lxc_tty_info *ttys)
free(ttys->tty);
ttys->tty = NULL;
ttys->nbtty = 0;
}
static int lxc_send_ttys_to_parent(struct lxc_handler *handler)
@ -1026,10 +1023,10 @@ static int lxc_send_ttys_to_parent(struct lxc_handler *handler)
struct lxc_tty_info *ttys = &conf->ttys;
int sock = handler->data_sock[0];
if (conf->tty == 0)
if (ttys->max == 0)
return 0;
for (i = 0; i < conf->tty; i++) {
for (i = 0; i < ttys->max; i++) {
int ttyfds[2];
struct lxc_terminal_info *tty = &ttys->tty[i];
@ -1045,10 +1042,10 @@ static int lxc_send_ttys_to_parent(struct lxc_handler *handler)
}
if (ret < 0)
ERROR("Failed to send %d ttys to parent: %s", conf->tty,
ERROR("Failed to send %zu ttys to parent: %s", ttys->max,
strerror(errno));
else
TRACE("Sent %d ttys to parent", conf->tty);
TRACE("Sent %zu ttys to parent", ttys->max);
return ret;
}
@ -1078,10 +1075,10 @@ static int lxc_create_ttys(struct lxc_handler *handler)
}
}
if (conf->pty_names) {
ret = setenv("container_ttys", conf->pty_names, 1);
if (conf->ttys.tty_names) {
ret = setenv("container_ttys", conf->ttys.tty_names, 1);
if (ret < 0)
SYSERROR("Failed to set \"container_ttys=%s\"", conf->pty_names);
SYSERROR("Failed to set \"container_ttys=%s\"", conf->ttys.tty_names);
}
ret = 0;
@ -3480,7 +3477,7 @@ int lxc_setup(struct lxc_handler *handler)
}
ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console,
lxc_conf->ttydir);
lxc_conf->ttys.dir);
if (ret < 0) {
ERROR("Failed to setup console");
return -1;
@ -3890,14 +3887,14 @@ void lxc_conf_free(struct lxc_conf *conf)
if (conf->logfd != -1)
close(conf->logfd);
free(conf->utsname);
free(conf->ttydir);
free(conf->ttys.dir);
free(conf->ttys.tty_names);
free(conf->fstab);
free(conf->rcfile);
free(conf->execute_cmd);
free(conf->init_cmd);
free(conf->init_cwd);
free(conf->unexpanded_config);
free(conf->pty_names);
free(conf->syslog);
lxc_free_networks(&conf->network);
free(conf->lsm_aa_profile);

15
src/lxc/conf.h
View File

@ -137,10 +137,12 @@ struct id_map {
/* Defines the number of tty configured and contains the
* instantiated ptys
* @nbtty = number of configured ttys
* @max = number of configured ttys
*/
struct lxc_tty_info {
int nbtty;
size_t max;
char *dir;
char *tty_names;
struct lxc_terminal_info *tty;
};
@ -214,8 +216,6 @@ struct lxc_state_client {
struct lxc_conf {
/* Pointer to the name of the container. Do not free! */
const char *name;
unsigned int tty;
unsigned int pts;
bool is_execute;
int reboot;
signed long personality;
@ -252,12 +252,13 @@ struct lxc_conf {
struct lxc_list caps;
struct lxc_list keepcaps;
struct lxc_tty_info ttys;
/* Comma-separated list of lxc.tty.max pty names. */
char *pty_names;
struct lxc_tty_info ttys;
unsigned int pts;
struct lxc_terminal console;
struct lxc_rootfs rootfs;
char *ttydir;
bool close_all_fds;
struct {

24
src/lxc/confile.c
View File

@ -1127,18 +1127,26 @@ on_error:
static int set_config_tty_max(const char *key, const char *value,
struct lxc_conf *lxc_conf, void *data)
{
int ret;
unsigned int nbtty = 0;
if (lxc_config_value_empty(value)) {
lxc_conf->tty = 0;
lxc_conf->ttys.max = 0;
return 0;
}
return lxc_safe_uint(value, &lxc_conf->tty);
ret = lxc_safe_uint(value, &nbtty);
if (ret < 0)
return -1;
lxc_conf->ttys.max = nbtty;
return 0;
}
static int set_config_tty_dir(const char *key, const char *value,
struct lxc_conf *lxc_conf, void *data)
{
return set_config_string_item_max(&lxc_conf->ttydir, value,
return set_config_string_item_max(&lxc_conf->ttys.dir, value,
NAME_MAX + 1);
}
@ -2917,13 +2925,13 @@ static int get_config_pty_max(const char *key, char *retv, int inlen,
static int get_config_tty_max(const char *key, char *retv, int inlen,
struct lxc_conf *c, void *data)
{
return lxc_get_conf_int(c, retv, inlen, c->tty);
return lxc_get_conf_size_t(c, retv, inlen, c->ttys.max);
}
static int get_config_tty_dir(const char *key, char *retv, int inlen,
struct lxc_conf *c, void *data)
{
return lxc_get_conf_str(retv, inlen, c->ttydir);
return lxc_get_conf_str(retv, inlen, c->ttys.dir);
}
static int get_config_apparmor_profile(const char *key, char *retv, int inlen,
@ -3695,15 +3703,15 @@ static inline int clr_config_pty_max(const char *key, struct lxc_conf *c,
static inline int clr_config_tty_max(const char *key, struct lxc_conf *c,
void *data)
{
c->tty = 0;
c->ttys.tty = 0;
return 0;
}
static inline int clr_config_tty_dir(const char *key, struct lxc_conf *c,
void *data)
{
free(c->ttydir);
c->ttydir = NULL;
free(c->ttys.dir);
c->ttys.dir = NULL;
return 0;
}

10
src/lxc/confile_utils.c
View File

@ -643,6 +643,16 @@ int lxc_get_conf_int(struct lxc_conf *c, char *retv, int inlen, int v)
return snprintf(retv, inlen, "%d", v);
}
int lxc_get_conf_size_t(struct lxc_conf *c, char *retv, int inlen, size_t v)
{
if (!retv)
inlen = 0;
else
memset(retv, 0, inlen);
return snprintf(retv, inlen, "%zu", v);
}
int lxc_get_conf_uint64(struct lxc_conf *c, char *retv, int inlen, uint64_t v)
{
if (!retv)

1
src/lxc/confile_utils.h
View File

@ -84,6 +84,7 @@ extern void update_hwaddr(const char *line);
extern bool new_hwaddr(char *hwaddr);
extern int lxc_get_conf_str(char *retv, int inlen, const char *value);
extern int lxc_get_conf_int(struct lxc_conf *c, char *retv, int inlen, int v);
extern int lxc_get_conf_size_t(struct lxc_conf *c, char *retv, int inlen, size_t v);
extern int lxc_get_conf_uint64(struct lxc_conf *c, char *retv, int inlen, uint64_t v);
extern bool parse_limit_value(const char **value, rlim_t *res);
extern int lxc_inherit_namespace(const char *lxcname_or_pid,

16
src/lxc/start.c
View File

@ -1331,8 +1331,8 @@ static int do_start(void *data)
goto out_warn_father;
}
if (handler->conf->pty_names) {
ret = putenv(handler->conf->pty_names);
if (handler->conf->ttys.tty_names) {
ret = putenv(handler->conf->ttys.tty_names);
if (ret < 0) {
SYSERROR("Failed to set environment variable for container ptys");
goto out_warn_father;
@ -1397,14 +1397,14 @@ static int lxc_recv_ttys_from_child(struct lxc_handler *handler)
struct lxc_conf *conf = handler->conf;
struct lxc_tty_info *ttys = &conf->ttys;
if (!conf->tty)
if (!conf->ttys.max)
return 0;
ttys->tty = malloc(sizeof(*ttys->tty) * conf->tty);
ttys->tty = malloc(sizeof(*ttys->tty) * ttys->max);
if (!ttys->tty)
return -1;
for (i = 0; i < conf->tty; i++) {
for (i = 0; i < conf->ttys.max; i++) {
int ttyfds[2];
ret = lxc_abstract_unix_recv_fds(sock, ttyfds, 2, NULL, 0);
@ -1419,12 +1419,10 @@ static int lxc_recv_ttys_from_child(struct lxc_handler *handler)
"parent", tty->master, tty->slave);
}
if (ret < 0)
ERROR("Failed to receive %d ttys from child: %s", conf->tty,
ERROR("Failed to receive %zu ttys from child: %s", ttys->max,
strerror(errno));
else
TRACE("Received %d ttys from child", conf->tty);
ttys->nbtty = conf->tty;
TRACE("Received %zu ttys from child", ttys->max);
return ret;
}

8
src/lxc/terminal.c
View File

@ -618,7 +618,7 @@ int lxc_terminal_allocate(struct lxc_conf *conf, int sockfd, int *ttyreq)
}
if (*ttyreq > 0) {
if (*ttyreq > ttys->nbtty)
if (*ttyreq > ttys->max)
goto out;
if (ttys->tty[*ttyreq - 1].busy)
@ -630,12 +630,12 @@ int lxc_terminal_allocate(struct lxc_conf *conf, int sockfd, int *ttyreq)
}
/* Search for next available tty, fixup index tty1 => [0]. */
for (ttynum = 1; ttynum <= ttys->nbtty && ttys->tty[ttynum - 1].busy; ttynum++) {
for (ttynum = 1; ttynum <= ttys->max && ttys->tty[ttynum - 1].busy; ttynum++) {
;
}
/* We didn't find any available slot for tty. */
if (ttynum > ttys->nbtty)
if (ttynum > ttys->max)
goto out;
*ttyreq = ttynum;
@ -654,7 +654,7 @@ void lxc_terminal_free(struct lxc_conf *conf, int fd)
struct lxc_tty_info *ttys = &conf->ttys;
struct lxc_terminal *terminal = &conf->console;
for (i = 0; i < ttys->nbtty; i++)
for (i = 0; i < ttys->max; i++)
if (ttys->tty[i].busy == fd)
ttys->tty[i].busy = 0;