/*
* Connect to a slurmstepd proccess by way of its unix domain socket.
*
* Both "directory" and "nodename" may be null, in which case stepd_connect
* will attempt to determine them on its own. If you are using multiple
* slurmd on one node (unusual outside of development environments), you
* will get one of the local NodeNames more-or-less at random.
*
* Returns a socket descriptor for the opened socket on success,
* and -1 on error.
*/
int
stepd_connect(const char *directory, const char *nodename,
uint32_t jobid, uint32_t stepid)
{
int req = REQUEST_CONNECT;
int fd = -1;
int rc;
void *auth_cred;
Buf buffer;
int len;
if (nodename == NULL) {
if (!(nodename = _guess_nodename()))
return -1;
}
if (directory == NULL) {
slurm_ctl_conf_t *cf;
cf = slurm_conf_lock();
directory = slurm_conf_expand_slurmd_path(
cf->slurmd_spooldir, nodename);
slurm_conf_unlock();
}
buffer = init_buf(0);
/* Create an auth credential */
auth_cred = g_slurm_auth_create(NULL, 2, NULL);
if (auth_cred == NULL) {
error("Creating authentication credential: %s",
g_slurm_auth_errstr(g_slurm_auth_errno(NULL)));
slurm_seterrno(SLURM_PROTOCOL_AUTHENTICATION_ERROR);
goto fail1;
}
/* Pack the auth credential */
rc = g_slurm_auth_pack(auth_cred, buffer);
(void) g_slurm_auth_destroy(auth_cred);
if (rc) {
error("Packing authentication credential: %s",
g_slurm_auth_errstr(g_slurm_auth_errno(auth_cred)));
slurm_seterrno(SLURM_PROTOCOL_AUTHENTICATION_ERROR);
goto fail1;
}
/* Connect to the step */
fd = _step_connect(directory, nodename, jobid, stepid);
if (fd == -1)
goto fail1;
safe_write(fd, &req, sizeof(int));
len = size_buf(buffer);
safe_write(fd, &len, sizeof(int));
safe_write(fd, get_buf_data(buffer), len);
safe_read(fd, &rc, sizeof(int));
if (rc < 0) {
error("slurmstepd refused authentication: %m");
slurm_seterrno(SLURM_PROTOCOL_AUTHENTICATION_ERROR);
goto rwfail;
}
free_buf(buffer);
return fd;
rwfail:
close(fd);
fail1:
free_buf(buffer);
return -1;
}
/*
* Scan for available running slurm step daemons by checking
* "directory" for unix domain sockets with names beginning in "nodename".
*
* Both "directory" and "nodename" may be null, in which case stepd_available
* will attempt to determine them on its own. If you are using multiple
* slurmd on one node (unusual outside of development environments), you
* will get one of the local NodeNames more-or-less at random.
*
* Returns a List of pointers to step_loc_t structures.
*/
List
stepd_available(const char *directory, const char *nodename)
{
List l;
DIR *dp;
struct dirent *ent;
regex_t re;
struct stat stat_buf;
if (nodename == NULL) {
if (!(nodename = _guess_nodename()))
return NULL;
}
if (directory == NULL) {
slurm_ctl_conf_t *cf;
cf = slurm_conf_lock();
directory = slurm_conf_expand_slurmd_path(
cf->slurmd_spooldir, nodename);
slurm_conf_unlock();
}
l = list_create((ListDelF) _free_step_loc_t);
if (_sockname_regex_init(&re, nodename) == -1)
goto done;
/*
* Make sure that "directory" exists and is a directory.
*/
if (stat(directory, &stat_buf) < 0) {
error("Domain socket directory %s: %m", directory);
goto done;
} else if (!S_ISDIR(stat_buf.st_mode)) {
error("%s is not a directory", directory);
goto done;
}
if ((dp = opendir(directory)) == NULL) {
error("Unable to open directory: %m");
goto done;
}
while ((ent = readdir(dp)) != NULL) {
step_loc_t *loc;
uint32_t jobid, stepid;
if (_sockname_regex(&re, ent->d_name, &jobid, &stepid) == 0) {
debug4("found jobid = %u, stepid = %u", jobid, stepid);
loc = xmalloc(sizeof(step_loc_t));
loc->directory = xstrdup(directory);
loc->nodename = xstrdup(nodename);
loc->jobid = jobid;
loc->stepid = stepid;
list_append(l, (void *)loc);
}
}
closedir(dp);
done:
regfree(&re);
return l;
}
/*
* Connect to a slurmstepd proccess by way of its unix domain socket.
*
* Both "directory" and "nodename" may be null, in which case stepd_connect
* will attempt to determine them on its own. If you are using multiple
* slurmd on one node (unusual outside of development environments), you
* will get one of the local NodeNames more-or-less at random.
*
* Returns a socket descriptor for the opened socket on success,
* and -1 on error.
*/
int
stepd_connect(const char *directory, const char *nodename,
uint32_t jobid, uint32_t stepid, uint16_t *protocol_version)
{
int req = REQUEST_CONNECT;
int fd = -1;
int rc;
void *auth_cred;
Buf buffer;
int len;
*protocol_version = 0;
if (nodename == NULL) {
if (!(nodename = _guess_nodename()))
return -1;
}
if (directory == NULL) {
slurm_ctl_conf_t *cf;
cf = slurm_conf_lock();
directory = slurm_conf_expand_slurmd_path(
cf->slurmd_spooldir, nodename);
slurm_conf_unlock();
}
buffer = init_buf(0);
/* Create an auth credential */
auth_cred = g_slurm_auth_create(NULL, 2, NULL);
if (auth_cred == NULL) {
error("Creating authentication credential: %s",
g_slurm_auth_errstr(g_slurm_auth_errno(NULL)));
slurm_seterrno(SLURM_PROTOCOL_AUTHENTICATION_ERROR);
goto fail1;
}
/* Pack the auth credential */
rc = g_slurm_auth_pack(auth_cred, buffer);
(void) g_slurm_auth_destroy(auth_cred);
if (rc) {
error("Packing authentication credential: %s",
g_slurm_auth_errstr(g_slurm_auth_errno(auth_cred)));
slurm_seterrno(SLURM_PROTOCOL_AUTHENTICATION_ERROR);
goto fail1;
}
/* Connect to the step */
fd = _step_connect(directory, nodename, jobid, stepid);
if (fd == -1)
goto fail1;
safe_write(fd, &req, sizeof(int));
len = size_buf(buffer);
safe_write(fd, &len, sizeof(int));
safe_write(fd, get_buf_data(buffer), len);
safe_read(fd, &rc, sizeof(int));
if (rc < 0) {
error("slurmstepd refused authentication: %m");
slurm_seterrno(SLURM_PROTOCOL_AUTHENTICATION_ERROR);
goto rwfail;
} else if (rc)
*protocol_version = rc;
else {
/* 0n older versions of Slurm < 14.11 SLURM_SUCCESS
* was returned here instead of the protocol version.
* This can be removed when we are 2 versions past
* 14.11.
*/
slurmstepd_info_t *stepd_info = stepd_get_info(fd);
*protocol_version = stepd_info->protocol_version;
xfree(stepd_info);
}
free_buf(buffer);
return fd;
rwfail:
close(fd);
fail1:
free_buf(buffer);
return -1;
}
