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minix/servers/rs/manager.c
Ben Gras 35a108b911 panic() cleanup. 
this change
   - makes panic() variadic, doing full printf() formatting -
     no more NO_NUM, and no more separate printf() statements
     needed to print extra info (or something in hex) before panicing
   - unifies panic() - same panic() name and usage for everyone -
     vm, kernel and rest have different names/syntax currently
     in order to implement their own luxuries, but no longer
   - throws out the 1st argument, to make source less noisy.
     the panic() in syslib retrieves the server name from the kernel
     so it should be clear enough who is panicing; e.g.
         panic("sigaction failed: %d", errno);
     looks like:
         at_wini(73130): panic: sigaction failed: 0
         syslib:panic.c: stacktrace: 0x74dc 0x2025 0x100a
   - throws out report() - printf() is more convenient and powerful
   - harmonizes/fixes the use of panic() - there were a few places
     that used printf-style formatting (didn't work) and newlines
     (messes up the formatting) in panic()
   - throws out a few per-server panic() functions
   - cleans up a tie-in of tty with panic()

merging printf() and panic() statements to be done incrementally.
2010-03-05 15:05:11 +00:00

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/*
* Changes:
* Nov 22, 2009: added basic live update support (Cristiano Giuffrida)
* Mar 02, 2009: Extended isolation policies (Jorrit N. Herder)
* Jul 22, 2005: Created (Jorrit N. Herder)
*/
#include "inc.h"
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/vm.h>
#include <minix/vm.h>
#include <lib.h>
#include <minix/sysutil.h>
/* Prototypes for internal functions that do the hard work. */
FORWARD _PROTOTYPE( int caller_is_root, (endpoint_t endpoint) );
FORWARD _PROTOTYPE( int caller_can_control, (endpoint_t endpoint,
char *label) );
FORWARD _PROTOTYPE( int copy_label, (endpoint_t src_e,
struct rss_label *src_label, char *dst_label, size_t dst_len) );
FORWARD _PROTOTYPE( int start_service, (struct rproc *rp, int flags,
endpoint_t *ep) );
FORWARD _PROTOTYPE( void stop_service, (struct rproc *rp,int how) );
FORWARD _PROTOTYPE( int fork_nb, (void) );
FORWARD _PROTOTYPE( int read_exec, (struct rproc *rp) );
FORWARD _PROTOTYPE( int share_exec, (struct rproc *rp_src,
struct rproc *rp_dst) );
FORWARD _PROTOTYPE( void free_slot, (struct rproc *rp) );
FORWARD _PROTOTYPE( void run_script, (struct rproc *rp) );
FORWARD _PROTOTYPE( char *get_next_label, (char *ptr, char *label,
char *caller_label) );
FORWARD _PROTOTYPE( void add_forward_ipc, (struct rproc *rp,
struct priv *privp) );
FORWARD _PROTOTYPE( void add_backward_ipc, (struct rproc *rp,
struct priv *privp) );
FORWARD _PROTOTYPE( void init_privs, (struct rproc *rp, struct priv *privp) );
FORWARD _PROTOTYPE( void init_pci, (struct rproc *rp, int endpoint) );
FORWARD _PROTOTYPE( void update_period, (message *m_ptr) );
FORWARD _PROTOTYPE( void end_update, (clock_t now) );
PRIVATE int shutting_down = FALSE;
/*===========================================================================*
* caller_is_root *
*===========================================================================*/
PRIVATE int caller_is_root(endpoint)
endpoint_t endpoint; /* caller endpoint */
{
uid_t euid;
/* Check if caller has root user ID. */
euid = getnuid(endpoint);
if (rs_verbose && euid != 0)
{
printf("RS: got unauthorized request from endpoint %d\n", endpoint);
}
return euid == 0;
}
/*===========================================================================*
* caller_can_control *
*===========================================================================*/
PRIVATE int caller_can_control(endpoint, label)
endpoint_t endpoint;
char *label;
{
int control_allowed = 0;
register struct rproc *rp;
register struct rprocpub *rpub;
int c;
char *progname;
/* Find name of binary for given label. */
for (rp = BEG_RPROC_ADDR; rp < END_RPROC_ADDR; rp++) {
rpub = rp->r_pub;
if (strcmp(rpub->label, label) == 0) {
break;
}
}
if (rp == END_RPROC_ADDR) return 0;
progname = strrchr(rp->r_argv[0], '/');
if (progname != NULL)
progname++;
else
progname = rp->r_argv[0];
/* Check if label is listed in caller's isolation policy. */
for (rp = BEG_RPROC_ADDR; rp < END_RPROC_ADDR; rp++) {
rpub = rp->r_pub;
if (rpub->endpoint == endpoint) {
break;
}
}
if (rp == END_RPROC_ADDR) return 0;
if (rp->r_nr_control > 0) {
for (c = 0; c < rp->r_nr_control; c++) {
if (strcmp(rp->r_control[c], progname) == 0)
control_allowed = 1;
}
}
if (rs_verbose) {
printf("RS: allowing %u control over %s via policy: %s\n",
endpoint, label, control_allowed ? "yes" : "no");
}
return control_allowed;
}
/*===========================================================================*
* copy_label *
*===========================================================================*/
PRIVATE int copy_label(src_e, src_label, dst_label, dst_len)
endpoint_t src_e;
struct rss_label *src_label;
char *dst_label;
size_t dst_len;
{
int s, len;
len = MIN(dst_len-1, src_label->l_len);
s = sys_datacopy(src_e, (vir_bytes) src_label->l_addr,
SELF, (vir_bytes) dst_label, len);
if (s != OK) return s;
dst_label[len] = 0;
return OK;
}
/*===========================================================================*
* do_up *
*===========================================================================*/
PUBLIC int do_up(m_ptr)
message *m_ptr; /* request message pointer */
{
/* A request was made to start a new system service.
*/
register struct rproc *rp; /* system process table */
register struct rprocpub *rpub; /* public entry */
int slot_nr; /* local table entry */
int arg_count; /* number of arguments */
char *cmd_ptr; /* parse command string */
char *label; /* unique name of command */
enum dev_style dev_style; /* device style */
int s; /* status variable */
int len; /* length of string */
int i;
int r;
endpoint_t ep;
struct rproc *tmp_rp;
struct rprocpub *tmp_rpub;
struct rs_start rs_start;
/* This call requires special privileges. */
if (!caller_is_root(m_ptr->m_source)) return(EPERM);
/* See if there is a free entry in the table with system processes. */
for (slot_nr = 0; slot_nr < NR_SYS_PROCS; slot_nr++) {
rp = &rproc[slot_nr]; /* get pointer to slot */
if (!(rp->r_flags & RS_IN_USE)) /* check if available */
break;
}
if (slot_nr >= NR_SYS_PROCS)
{
printf("RS: do_up: system process table full\n");
return ENOMEM;
}
rpub = rp->r_pub;
/* Ok, there is space. Get the request structure. */
s= sys_datacopy(m_ptr->m_source, (vir_bytes) m_ptr->RS_CMD_ADDR,
SELF, (vir_bytes) &rs_start, sizeof(rs_start));
if (s != OK) return(s);
/* Obtain command name and parameters. This is a space-separated string
* that looks like "/sbin/service arg1 arg2 ...". Arguments are optional.
*/
if (rs_start.rss_cmdlen > MAX_COMMAND_LEN-1) return(E2BIG);
s=sys_datacopy(m_ptr->m_source, (vir_bytes) rs_start.rss_cmd,
SELF, (vir_bytes) rp->r_cmd, rs_start.rss_cmdlen);
if (s != OK) return(s);
rp->r_cmd[rs_start.rss_cmdlen] = '\0'; /* ensure it is terminated */
if (rp->r_cmd[0] != '/') return(EINVAL); /* insist on absolute path */
/* Build argument vector to be passed to execute call. The format of the
* arguments vector is: path, arguments, NULL.
*/
arg_count = 0; /* initialize arg count */
rp->r_argv[arg_count++] = rp->r_cmd; /* start with path */
cmd_ptr = rp->r_cmd; /* do some parsing */
while(*cmd_ptr != '\0') { /* stop at end of string */
if (*cmd_ptr == ' ') { /* next argument */
*cmd_ptr = '\0'; /* terminate previous */
while (*++cmd_ptr == ' ') ; /* skip spaces */
if (*cmd_ptr == '\0') break; /* no arg following */
if (arg_count>MAX_NR_ARGS+1) break; /* arg vector full */
rp->r_argv[arg_count++] = cmd_ptr; /* add to arg vector */
}
cmd_ptr ++; /* continue parsing */
}
rp->r_argv[arg_count] = NULL; /* end with NULL pointer */
rp->r_argc = arg_count;
/* Process name for the service. */
cmd_ptr = strrchr(rp->r_argv[0], '/');
if (cmd_ptr)
cmd_ptr++;
else
cmd_ptr= rp->r_argv[0];
len= strlen(cmd_ptr);
if (len > RS_MAX_LABEL_LEN-1)
len= RS_MAX_LABEL_LEN-1; /* truncate name */
memcpy(rpub->proc_name, cmd_ptr, len);
rpub->proc_name[len]= '\0';
if(rs_verbose)
printf("RS: do_up: using proc_name (from binary %s) '%s'\n",
rp->r_argv[0], rpub->proc_name);
if(rs_start.rss_label.l_len > 0) {
/* RS_UP caller has supplied a custom label for this service. */
int s = copy_label(m_ptr->m_source, &rs_start.rss_label,
rpub->label, sizeof(rpub->label));
if(s != OK)
return s;
if(rs_verbose)
printf("RS: do_up: using label (custom) '%s'\n", rpub->label);
} else {
/* Default label for the service. */
label = rpub->proc_name;
len= strlen(label);
memcpy(rpub->label, label, len);
rpub->label[len]= '\0';
if(rs_verbose)
printf("RS: do_up: using label (from proc_name) '%s'\n",
rpub->label);
}
if(rs_start.rss_nr_control > 0) {
int i, s;
if (rs_start.rss_nr_control > RS_NR_CONTROL)
{
printf("RS: do_up: too many control labels\n");
return EINVAL;
}
for (i=0; i<rs_start.rss_nr_control; i++) {
s = copy_label(m_ptr->m_source, &rs_start.rss_control[i],
rp->r_control[i], sizeof(rp->r_control[i]));
if(s != OK)
return s;
}
rp->r_nr_control = rs_start.rss_nr_control;
if (rs_verbose) {
printf("RS: do_up: control labels:");
for (i=0; i<rp->r_nr_control; i++)
printf(" %s", rp->r_control[i]);
printf("\n");
}
}
/* Check for duplicates */
for (slot_nr = 0; slot_nr < NR_SYS_PROCS; slot_nr++) {
tmp_rp = &rproc[slot_nr]; /* get pointer to slot */
if (!(tmp_rp->r_flags & RS_IN_USE)) /* check if available */
continue;
if (tmp_rp == rp)
continue; /* Our slot */
tmp_rpub = tmp_rp->r_pub;
if (strcmp(tmp_rpub->label, rpub->label) == 0)
{
printf("RS: found duplicate label '%s': slot %d\n",
rpub->label, slot_nr);
return EBUSY;
}
}
rp->r_script[0]= '\0';
if (rs_start.rss_scriptlen > MAX_SCRIPT_LEN-1) return(E2BIG);
if (rs_start.rss_script != NULL)
{
s=sys_datacopy(m_ptr->m_source, (vir_bytes) rs_start.rss_script,
SELF, (vir_bytes) rp->r_script, rs_start.rss_scriptlen);
if (s != OK) return(s);
rp->r_script[rs_start.rss_scriptlen] = '\0';
}
rp->r_uid= rs_start.rss_uid;
rp->r_nice= rs_start.rss_nice;
if (rs_start.rss_flags & RSS_IPC_VALID)
{
if (rs_start.rss_ipclen+1 > sizeof(rp->r_ipc_list))
{
printf("rs: ipc list too long for '%s'\n", rpub->label);
return EINVAL;
}
s=sys_datacopy(m_ptr->m_source, (vir_bytes) rs_start.rss_ipc,
SELF, (vir_bytes) rp->r_ipc_list, rs_start.rss_ipclen);
if (s != OK) return(s);
rp->r_ipc_list[rs_start.rss_ipclen]= '\0';
}
else
rp->r_ipc_list[0]= '\0';
rpub->sys_flags = DSRV_SF;
rp->r_exec= NULL;
if (rs_start.rss_flags & RSS_COPY) {
int exst_cpy;
struct rproc *rp2;
struct rprocpub *rpub2;
exst_cpy = 0;
if(rs_start.rss_flags & RSS_REUSE) {
int i;
for(i = 0; i < NR_SYS_PROCS; i++) {
rp2 = &rproc[i];
rpub2 = rproc[i].r_pub;
if(strcmp(rpub->proc_name, rpub2->proc_name) == 0 &&
(rpub2->sys_flags & SF_USE_COPY)) {
/* We have found the same binary that's
* already been copied */
exst_cpy = 1;
break;
}
}
}
if(!exst_cpy)
s = read_exec(rp);
else
s = share_exec(rp, rp2);
if (s != OK)
return s;
rpub->sys_flags |= SF_USE_COPY;
}
/* All dynamically created services get the same privilege flags, and
* allowed traps. Other privilege settings can be specified at runtime.
* The privilege id is dynamically allocated by the kernel.
*/
rp->r_priv.s_flags = DSRV_F; /* privilege flags */
rp->r_priv.s_trap_mask = DSRV_T; /* allowed traps */
/* Copy granted resources */
if (rs_start.rss_nr_irq > NR_IRQ)
{
printf("RS: do_up: too many IRQs requested\n");
return EINVAL;
}
rp->r_priv.s_nr_irq= rs_start.rss_nr_irq;
for (i= 0; i<rp->r_priv.s_nr_irq; i++)
{
rp->r_priv.s_irq_tab[i]= rs_start.rss_irq[i];
if(rs_verbose)
printf("RS: do_up: IRQ %d\n", rp->r_priv.s_irq_tab[i]);
}
if (rs_start.rss_nr_io > NR_IO_RANGE)
{
printf("RS: do_up: too many I/O ranges requested\n");
return EINVAL;
}
rp->r_priv.s_nr_io_range= rs_start.rss_nr_io;
for (i= 0; i<rp->r_priv.s_nr_io_range; i++)
{
rp->r_priv.s_io_tab[i].ior_base= rs_start.rss_io[i].base;
rp->r_priv.s_io_tab[i].ior_limit=
rs_start.rss_io[i].base+rs_start.rss_io[i].len-1;
if(rs_verbose)
printf("RS: do_up: I/O [%x..%x]\n",
rp->r_priv.s_io_tab[i].ior_base,
rp->r_priv.s_io_tab[i].ior_limit);
}
if (rs_start.rss_nr_pci_id > RS_NR_PCI_DEVICE)
{
printf("RS: do_up: too many PCI device IDs\n");
return EINVAL;
}
rpub->pci_acl.rsp_nr_device = rs_start.rss_nr_pci_id;
for (i= 0; i<rpub->pci_acl.rsp_nr_device; i++)
{
rpub->pci_acl.rsp_device[i].vid= rs_start.rss_pci_id[i].vid;
rpub->pci_acl.rsp_device[i].did= rs_start.rss_pci_id[i].did;
if(rs_verbose)
printf("RS: do_up: PCI %04x/%04x\n",
rpub->pci_acl.rsp_device[i].vid,
rpub->pci_acl.rsp_device[i].did);
}
if (rs_start.rss_nr_pci_class > RS_NR_PCI_CLASS)
{
printf("RS: do_up: too many PCI class IDs\n");
return EINVAL;
}
rpub->pci_acl.rsp_nr_class= rs_start.rss_nr_pci_class;
for (i= 0; i<rpub->pci_acl.rsp_nr_class; i++)
{
rpub->pci_acl.rsp_class[i].class= rs_start.rss_pci_class[i].class;
rpub->pci_acl.rsp_class[i].mask= rs_start.rss_pci_class[i].mask;
if(rs_verbose)
printf("RS: do_up: PCI class %06x mask %06x\n",
rpub->pci_acl.rsp_class[i].class,
rpub->pci_acl.rsp_class[i].mask);
}
/* Copy 'system' call number bits */
if (sizeof(rs_start.rss_system[0]) == sizeof(rp->r_call_mask[0]) &&
sizeof(rs_start.rss_system) == sizeof(rp->r_call_mask))
{
for (i= 0; i<RS_SYS_CALL_MASK_SIZE; i++)
rp->r_call_mask[i]= rs_start.rss_system[i];
}
else
{
printf(
"RS: do_up: internal inconsistency: bad size of r_call_mask\n");
memset(rp->r_call_mask, '\0', sizeof(rp->r_call_mask));
}
/* Initialize some fields. */
rpub->period = rs_start.rss_period;
rpub->dev_nr = rs_start.rss_major;
rpub->dev_style = STYLE_DEV;
rp->r_restarts = -1; /* will be incremented */
rp->r_set_resources= 1; /* set resources */
if (sizeof(rpub->vm_call_mask) == sizeof(rs_start.rss_vm) &&
sizeof(rpub->vm_call_mask[0]) == sizeof(rs_start.rss_vm[0]))
{
int basic_vmc[] = { VM_BASIC_CALLS, SYS_NULL_C };
memcpy(rpub->vm_call_mask, rs_start.rss_vm,
sizeof(rpub->vm_call_mask));
fill_call_mask(basic_vmc, NR_VM_CALLS,
rpub->vm_call_mask, VM_RQ_BASE, FALSE);
}
else
{
printf("RS: internal inconsistency: bad size of vm_call_mask\n");
memset(rpub->vm_call_mask, '\0', sizeof(rpub->vm_call_mask));
}
/* All information was gathered. Now try to start the system service. */
r = start_service(rp, 0, &ep);
m_ptr->RS_ENDPOINT = ep;
return r;
}
/*===========================================================================*
* do_down *
*===========================================================================*/
PUBLIC int do_down(message *m_ptr)
{
register struct rproc *rp;
register struct rprocpub *rpub;
size_t len;
int s, proc;
char label[RS_MAX_LABEL_LEN];
/* This call requires special privileges. */
if (!caller_is_root(m_ptr->m_source)) return(EPERM);
len= m_ptr->RS_CMD_LEN;
if (len >= sizeof(label))
return EINVAL; /* Too long */
s= sys_datacopy(m_ptr->m_source, (vir_bytes) m_ptr->RS_CMD_ADDR,
SELF, (vir_bytes) label, len);
if (s != OK) return(s);
label[len]= '\0';
for (rp=BEG_RPROC_ADDR; rp<END_RPROC_ADDR; rp++) {
rpub = rp->r_pub;
if (rp->r_flags & RS_IN_USE && strcmp(rpub->label, label) == 0) {
/* Core system services should never go down. */
if (rpub->sys_flags & SF_CORE_SRV) return(EPERM);
if(rs_verbose)
printf("RS: stopping '%s' (%d)\n", label, rp->r_pid);
stop_service(rp,RS_EXITING);
if (rp->r_pid == -1)
{
/* Process is already gone, release slot. */
free_slot(rp);
return(OK);
}
/* Late reply - send a reply when process dies. */
rp->r_flags |= RS_LATEREPLY;
rp->r_caller = m_ptr->m_source;
return EDONTREPLY;
}
}
if(rs_verbose) printf("RS: do_down: '%s' not found\n", label);
return(ESRCH);
}
/*===========================================================================*
* do_restart *
*===========================================================================*/
PUBLIC int do_restart(message *m_ptr)
{
register struct rproc *rp;
register struct rprocpub *rpub;
size_t len;
int s, proc, r;
char label[RS_MAX_LABEL_LEN];
endpoint_t ep;
len= m_ptr->RS_CMD_LEN;
if (len >= sizeof(label))
return EINVAL; /* Too long */
s= sys_datacopy(m_ptr->m_source, (vir_bytes) m_ptr->RS_CMD_ADDR,
SELF, (vir_bytes) label, len);
if (s != OK) return(s);
label[len]= '\0';
/* This call requires special privileges. */
if (! (caller_can_control(m_ptr->m_source, label) ||
caller_is_root(m_ptr->m_source))) {
return(EPERM);
}
for (rp=BEG_RPROC_ADDR; rp<END_RPROC_ADDR; rp++) {
rpub = rp->r_pub;
if ((rp->r_flags & RS_IN_USE) && strcmp(rpub->label, label) == 0) {
if(rs_verbose) printf("RS: restarting '%s' (%d)\n", label, rp->r_pid);
if (rp->r_pid >= 0)
{
if(rs_verbose)
printf("RS: do_restart: '%s' is (still) running, pid = %d\n",
rp->r_pid);
return EBUSY;
}
rp->r_flags &= ~(RS_REFRESHING|RS_NOPINGREPLY);
r = start_service(rp, 0, &ep);
if (r != OK) printf("do_restart: start_service failed: %d\n", r);
m_ptr->RS_ENDPOINT = ep;
return(r);
}
}
if(rs_verbose) {
printf("RS: do_restart: '%s' not found\n", label);
}
return(ESRCH);
}
/*===========================================================================*
* do_refresh *
*===========================================================================*/
PUBLIC int do_refresh(message *m_ptr)
{
register struct rproc *rp;
register struct rprocpub *rpub;
size_t len;
int s;
char label[RS_MAX_LABEL_LEN];
len= m_ptr->RS_CMD_LEN;
if (len >= sizeof(label))
return EINVAL; /* Too long */
s= sys_datacopy(m_ptr->m_source, (vir_bytes) m_ptr->RS_CMD_ADDR,
SELF, (vir_bytes) label, len);
if (s != OK) return(s);
label[len]= '\0';
/* This call requires special privileges. */
if (! (caller_can_control(m_ptr->m_source, label) ||
caller_is_root(m_ptr->m_source))) {
return(EPERM);
}
for (rp=BEG_RPROC_ADDR; rp<END_RPROC_ADDR; rp++) {
rpub = rp->r_pub;
if (rp->r_flags & RS_IN_USE && strcmp(rpub->label, label) == 0) {
/* Only system processes not including RS can refresh. */
if(!(rp->r_priv.s_flags & SYS_PROC) || rpub->endpoint == RS_PROC_NR) {
return EPERM;
}
if(rs_verbose) {
printf("RS: refreshing %s (%d)\n", rpub->label, rp->r_pid);
}
stop_service(rp,RS_REFRESHING);
return(OK);
}
}
if(rs_verbose) {
printf("RS: do_refresh: '%s' not found\n", label);
}
return(ESRCH);
}
/*===========================================================================*
* do_shutdown *
*===========================================================================*/
PUBLIC int do_shutdown(message *m_ptr)
{
/* This call requires special privileges. */
if (m_ptr != NULL && !caller_is_root(m_ptr->m_source)) return(EPERM);
/* Set flag so that RS server knows services shouldn't be restarted. */
shutting_down = TRUE;
return(OK);
}
/*===========================================================================*
* do_init_ready *
*===========================================================================*/
PUBLIC int do_init_ready(message *m_ptr)
{
int who_p;
struct rproc *rp;
struct rprocpub *rpub;
int result;
who_p = _ENDPOINT_P(m_ptr->m_source);
rp = rproc_ptr[who_p];
rpub = rp->r_pub;
result = m_ptr->RS_INIT_RESULT;
/* Make sure the originating service was requested to initialize. */
if(! (rp->r_flags & RS_INITIALIZING) ) {
if(rs_verbose) {
printf("RS: do_init_ready: got unexpected init ready msg from %d\n",
m_ptr->m_source);
}
return(EINVAL);
}
/* Mark the slot as no longer initializing. */
rp->r_flags &= ~RS_INITIALIZING;
rp->r_check_tm = 0;
getuptime(&rp->r_alive_tm);
/* Check if something went wrong and the service failed to init.
* In that case, kill it and make sure it won't be restarted.
*/
if(result != OK) {
if(rs_verbose)
printf("RS: initialization failed for service %d: %d\n",
rpub->endpoint, result);
rp->r_flags |= RS_EXITING;
kill(rp->r_pid, SIGKILL);
}
else {
if(rs_verbose)
printf("RS: initialization succeeded for service %d\n",
rpub->endpoint);
}
return(EDONTREPLY);
}
/*===========================================================================*
* do_update *
*===========================================================================*/
PUBLIC int do_update(message *m_ptr)
{
register struct rproc *rp;
register struct rprocpub *rpub;
size_t len;
int s;
char label[RS_MAX_LABEL_LEN];
int lu_state;
int prepare_maxtime;
/* Retrieve label. */
len= m_ptr->RS_CMD_LEN;
if (len >= sizeof(label))
return EINVAL; /* Too long */
s= sys_datacopy(m_ptr->m_source, (vir_bytes) m_ptr->RS_CMD_ADDR,
SELF, (vir_bytes) label, len);
if (s != OK) return(s);
label[len]= '\0';
/* This call requires special privileges. */
if (! (caller_can_control(m_ptr->m_source, label) ||
caller_is_root(m_ptr->m_source))) {
return(EPERM);
}
/* Retrieve live update state. */
lu_state = m_ptr->RS_LU_STATE;
if(lu_state == SEF_LU_STATE_NULL) {
return(EINVAL);
}
/* Retrieve prepare max time. */
prepare_maxtime = m_ptr->RS_LU_PREPARE_MAXTIME;
if(prepare_maxtime) {
if(prepare_maxtime < 0 || prepare_maxtime > RS_MAX_PREPARE_MAXTIME) {
return(EINVAL);
}
}
else {
prepare_maxtime = RS_DEFAULT_PREPARE_MAXTIME;
}
/* Make sure we are not already updating. */
if(rupdate.flags & RS_UPDATING) {
if(rs_verbose) {
printf("RS: do_update: an update is already in progress");
}
return(EBUSY);
}
/* Try to start the update process. */
for (rp=BEG_RPROC_ADDR; rp<END_RPROC_ADDR; rp++) {
rpub = rp->r_pub;
if (rp->r_flags & RS_IN_USE && strcmp(rpub->label, label) == 0) {
/* Only system processes not including RS can update. */
if(!(rp->r_priv.s_flags & SYS_PROC) || rpub->endpoint == RS_PROC_NR) {
return EPERM;
}
if(rs_verbose) {
printf("RS: updating %s (%d)\n", rpub->label, rp->r_pid);
}
rp->r_flags |= RS_UPDATING;
rupdate.flags |= RS_UPDATING;
getuptime(&rupdate.prepare_tm);
rupdate.prepare_maxtime = prepare_maxtime;
rupdate.rp = rp;
m_ptr->m_type = RS_LU_PREPARE;
asynsend(rpub->endpoint, m_ptr); /* request to update */
return(OK);
}
}
if(rs_verbose) {
printf("RS: do_update: '%s' not found\n", label);
}
return(ESRCH);
}
/*===========================================================================*
* do_upd_ready *
*===========================================================================*/
PUBLIC int do_upd_ready(message *m_ptr)
{
register struct rproc *rp;
int who_p;
clock_t now = m_ptr->NOTIFY_TIMESTAMP;
int result;
who_p = _ENDPOINT_P(m_ptr->m_source);
rp = rproc_ptr[who_p];
result = m_ptr->RS_LU_RESULT;
/* Make sure the originating service was requested to prepare for update. */
if(! (rp->r_flags & RS_UPDATING) ) {
if(rs_verbose) {
printf("RS: do_upd_ready: got unexpected update ready msg from %d\n",
m_ptr->m_source);
}
return(EINVAL);
}
/* Check if something went wrong and the service failed to prepare
* for the update. In that case, end the update process.
*/
if(result != OK) {
end_update(now);
switch(result) {
case EACCES:
printf("RS: update failed: %s\n",
"service does not support live update");
break;
case EINVAL:
printf("RS: update failed: %s\n",
"service does not support the required state");
break;
case EBUSY:
printf("RS: update failed: %s\n",
"service is not able to prepare for the update now");
break;
case EGENERIC:
printf("RS: update failed: %s\n",
"a generic error occurred while preparing for the update");
break;
default:
printf("RS: update failed: %s (%d)\n",
"an unknown error occurred while preparing for the update\n",
result);
break;
}
return(OK);
}
/* Kill the process now and mark it for refresh, the new version will
* be automatically restarted.
*/
rp->r_flags &= ~RS_EXITING;
rp->r_flags |= RS_REFRESHING;
kill(rp->r_pid, SIGKILL);
return(EDONTREPLY);
}
/*===========================================================================*
* update_period *
*===========================================================================*/
PRIVATE void update_period(message *m_ptr)
{
clock_t now = m_ptr->NOTIFY_TIMESTAMP;
short has_update_timed_out;
message m;
struct rprocpub *rpub;
rpub = rupdate.rp->r_pub;
/* See if a timeout has occurred. */
has_update_timed_out = (now - rupdate.prepare_tm > rupdate.prepare_maxtime);
/* If an update timed out, end the update process and notify the service. */
if(has_update_timed_out) {
end_update(now);
printf("RS: update failed: maximum prepare time reached\n");
/* Prepare cancel request. */
m.m_type = RS_LU_PREPARE;
m.RS_LU_STATE = SEF_LU_STATE_NULL;
asynsend(rpub->endpoint, &m);
}
}
/*===========================================================================*
* end_update *
*===========================================================================*/
PRIVATE void end_update(clock_t now)
{
/* End the update process and mark the affected service as no longer under
* update. Eventual late ready to update message (if any) will simply be
* ignored and the service can continue executing.
* We reset the check timestamp, so that if the service has a period a status
* request will be forced in the next period.
*/
rupdate.flags &= ~RS_UPDATING;
rupdate.rp->r_flags &= ~RS_UPDATING;
rupdate.rp->r_check_tm = 0;
}
/*===========================================================================*
* do_exit *
*===========================================================================*/
PUBLIC void do_exit(message *m_ptr)
{
register struct rproc *rp;
register struct rprocpub *rpub;
pid_t exit_pid;
int exit_status, r, slot_nr;
endpoint_t ep;
clock_t now = m_ptr->NOTIFY_TIMESTAMP;
if(rs_verbose)
printf("RS: got SIGCHLD signal, doing wait to get exited child.\n");
/* See which child exited and what the exit status is. This is done in a
* loop because multiple children may have exited, all reported by one
* SIGCHLD signal. The WNOHANG options is used to prevent blocking if,
* somehow, no exited child can be found.
*/
while ( (exit_pid = waitpid(-1, &exit_status, WNOHANG)) != 0 ) {
if(rs_verbose) {
#if 0
printf("RS: pid %d, ", exit_pid);
#endif
if (WIFSIGNALED(exit_status)) {
#if 0
printf("killed, signal number %d\n", WTERMSIG(exit_status));
#endif
}
else if (WIFEXITED(exit_status)) {
#if 0
printf("normal exit, status %d\n", WEXITSTATUS(exit_status));
#endif
}
}
/* Read from the exec pipe */
for (;;)
{
r= read(exec_pipe[0], &slot_nr, sizeof(slot_nr));
if (r == -1)
{
break; /* No data */
}
if (r != sizeof(slot_nr))
{
panic("do_exit: unaligned read from exec pipe: %d", r);
}
printf("do_exit: got slot %d\n", slot_nr);
if (slot_nr < 0 || slot_nr >= NR_SYS_PROCS)
{
panic("do_exit: bad slot number from exec pipe: %d", slot_nr);
}
rp= &rproc[slot_nr];
rp->r_flags |= RS_EXITING;
}
/* Search the system process table to see who exited.
* This should always succeed.
*/
for (rp=BEG_RPROC_ADDR; rp<END_RPROC_ADDR; rp++) {
rpub = rp->r_pub;
if ((rp->r_flags & RS_IN_USE) && rp->r_pid == exit_pid) {
int proc;
proc = _ENDPOINT_P(rpub->endpoint);
rproc_ptr[proc] = NULL; /* invalidate */
rp->r_pid= -1;
/* If PCI properties are set, inform the PCI driver. */
if(rpub->pci_acl.rsp_nr_device || rpub->pci_acl.rsp_nr_class) {
pci_del_acl(rpub->endpoint);
}
if ((rp->r_flags & RS_EXITING) || shutting_down) {
/* No reply sent to RS_DOWN yet. */
if(rp->r_flags & RS_LATEREPLY) {
message rsm;
rsm.m_type = OK;
send(rp->r_caller, &rsm);
}
/* Release slot. */
free_slot(rp);
}
else if(rp->r_flags & RS_REFRESHING) {
short is_updating = rp->r_flags & RS_UPDATING;
/* Refresh */
if (rp->r_script[0] != '\0')
run_script(rp);
else {
start_service(rp, 0, &ep); /* direct restart */
if(m_ptr)
m_ptr->RS_ENDPOINT = ep;
}
/* If updating, end the update process. */
if(is_updating) {
end_update(now);
printf("RS: update succeeded\n");
}
}
else {
/* Determine what to do. If this is the first unexpected
* exit, immediately restart this service. Otherwise use
* a binary exponential backoff.
*/
#if 0
rp->r_restarts= 0;
#endif
if (WIFSIGNALED(exit_status)) {
switch(WTERMSIG(exit_status))
{
case SIGKILL: rp->r_flags |= RS_KILLED; break;
default: rp->r_flags |= RS_SIGNALED; break;
}
}
else
rp->r_flags |= RS_CRASHED;
if (rp->r_script[0] != '\0') {
if(rs_verbose)
printf("RS: running restart script for %s\n",
rp->r_cmd);
run_script(rp);
} else if (rp->r_restarts > 0) {
printf("RS: restarting %s, restarts %d\n",
rp->r_cmd, rp->r_backoff);
rp->r_backoff = 1 << MIN(rp->r_restarts,(BACKOFF_BITS-2));
rp->r_backoff = MIN(rp->r_backoff,MAX_BACKOFF);
if ((rpub->sys_flags & SF_USE_COPY) && rp->r_backoff > 1)
rp->r_backoff= 1;
}
else {
printf("RS: restarting %s\n", rp->r_cmd);
start_service(rp, 0, &ep); /* direct restart */
if(m_ptr)
m_ptr->RS_ENDPOINT = ep;
/* Do this even if no I/O happens with the ioctl, in
* order to disambiguate requests with DEV_IOCTL_S.
*/
}
}
break;
}
}
}
}
/*===========================================================================*
* do_period *
*===========================================================================*/
PUBLIC void do_period(m_ptr)
message *m_ptr;
{
register struct rproc *rp;
register struct rprocpub *rpub;
clock_t now = m_ptr->NOTIFY_TIMESTAMP;
int s;
endpoint_t ep;
long period;
/* If an update is in progress, check its status. */
if(rupdate.flags & RS_UPDATING) {
update_period(m_ptr);
}
/* Search system services table. Only check slots that are in use and not
* updating.
*/
for (rp=BEG_RPROC_ADDR; rp<END_RPROC_ADDR; rp++) {
rpub = rp->r_pub;
if ((rp->r_flags & RS_IN_USE) && !(rp->r_flags & RS_UPDATING)) {
/* Compute period. */
period = rpub->period;
if(rp->r_flags & RS_INITIALIZING) {
period = RS_INIT_T;
}
/* If the service is to be revived (because it repeatedly exited,
* and was not directly restarted), the binary backoff field is
* greater than zero.
*/
if (rp->r_backoff > 0) {
rp->r_backoff -= 1;
if (rp->r_backoff == 0) {
start_service(rp, 0, &ep);
m_ptr->RS_ENDPOINT = ep;
}
}
/* If the service was signaled with a SIGTERM and fails to respond,
* kill the system service with a SIGKILL signal.
*/
else if (rp->r_stop_tm > 0 && now - rp->r_stop_tm > 2*RS_DELTA_T
&& rp->r_pid > 0) {
kill(rp->r_pid, SIGKILL); /* terminate */
}
/* There seems to be no special conditions. If the service has a
* period assigned check its status.
*/
else if (period > 0) {
/* Check if an answer to a status request is still pending. If
* the service didn't respond within time, kill it to simulate
* a crash. The failure will be detected and the service will
* be restarted automatically.
*/
if (rp->r_alive_tm < rp->r_check_tm) {
if (now - rp->r_alive_tm > 2*period &&
rp->r_pid > 0 && !(rp->r_flags & RS_NOPINGREPLY)) {
if(rs_verbose)
printf("RS: service %d reported late\n",
rpub->endpoint);
rp->r_flags |= RS_NOPINGREPLY;
if(rp->r_flags & RS_INITIALIZING) {
rp->r_flags |= RS_EXITING; /* don't restart */
}
kill(rp->r_pid, SIGKILL); /* simulate crash */
}
}
/* No answer pending. Check if a period expired since the last
* check and, if so request the system service's status.
*/
else if (now - rp->r_check_tm > rpub->period) {
#if 0
if(rs_verbose)
printf("RS: status request sent to %d\n", rpub->endpoint);
#endif
notify(rpub->endpoint); /* request status */
rp->r_check_tm = now; /* mark time */
}
}
}
}
/* Reschedule a synchronous alarm for the next period. */
if (OK != (s=sys_setalarm(RS_DELTA_T, 0)))
panic("couldn't set alarm: %d", s);
}
/*===========================================================================*
* start_service *
*===========================================================================*/
PRIVATE int start_service(rp, flags, endpoint)
struct rproc *rp;
int flags;
endpoint_t *endpoint;
{
/* Try to execute the given system service. Fork a new process. The child
* process will be inhibited from running by the NO_PRIV flag. Only let the
* child run once its privileges have been set by the parent.
*/
int child_proc_nr_e, child_proc_nr_n; /* child process slot */
pid_t child_pid; /* child's process id */
char *file_only;
int s, use_copy, slot_nr, init_type;
bitchunk_t *vm_mask;
message m;
char * null_env = NULL;
struct rprocpub *rpub;
rpub = rp->r_pub;
use_copy= (rpub->sys_flags & SF_USE_COPY);
/* See if we are not using a copy but we do need one to start the service. */
if(!use_copy && (rpub->sys_flags & SF_NEED_COPY)) {
printf("RS: unable to start service %s without an in-memory copy\n",
rpub->label);
free_slot(rp);
return(EPERM);
}
/* Now fork and branch for parent and child process (and check for error). */
if (use_copy) {
if(rs_verbose) printf("RS: fork_nb..\n");
child_pid= fork_nb();
} else {
if(rs_verbose) printf("RS: fork regular..\n");
child_pid = fork();
}
switch(child_pid) { /* see fork(2) */
case -1: /* fork failed */
printf("RS: warning, fork() failed: %d\n", errno); /* shouldn't happen */
return(errno); /* return error */
case 0: /* child process */
/* Try to execute the binary that has an absolute path. If this fails,
* e.g., because the root file system cannot be read, try to strip off
* the path, and see if the command is in RS' current working dir.
*/
nice(rp->r_nice); /* Nice before setuid, to allow negative
* nice values.
*/
setuid(rp->r_uid);
cpf_reload(); /* Tell kernel about grant table */
if (!use_copy)
{
execve(rp->r_argv[0], rp->r_argv, &null_env); /* POSIX execute */
file_only = strrchr(rp->r_argv[0], '/') + 1;
execve(file_only, rp->r_argv, &null_env); /* POSIX execute */
}
printf("RS: exec failed for %s: %d\n", rp->r_argv[0], errno);
slot_nr= rp-rproc;
s= write(exec_pipe[1], &slot_nr, sizeof(slot_nr));
if (s != sizeof(slot_nr))
printf("RS: write to exec pipe failed: %d/%d\n", s, errno);
exit(1); /* terminate child */
default: /* parent process */
#if 0
if(rs_verbose) printf("RS: parent forked, pid %d..\n", child_pid);
#endif
child_proc_nr_e = getnprocnr(child_pid); /* get child slot */
#if 0
if(rs_verbose) printf("RS: forked into %d..\n", child_proc_nr_e);
#endif
break; /* continue below */
}
/* Regardless of any following failures, there is now a child process.
* Update the system process table that is maintained by the RS server.
*/
child_proc_nr_n = _ENDPOINT_P(child_proc_nr_e);
rp->r_flags = RS_IN_USE | flags; /* mark slot in use */
rp->r_restarts += 1; /* raise nr of restarts */
rpub->endpoint = child_proc_nr_e; /* set child details */
rp->r_pid = child_pid;
rp->r_check_tm = 0; /* not checked yet */
getuptime(&rp->r_alive_tm); /* currently alive */
rp->r_stop_tm = 0; /* not exiting yet */
rp->r_backoff = 0; /* not to be restarted */
rproc_ptr[child_proc_nr_n] = rp; /* mapping for fast access */
rpub->in_use = TRUE; /* public entry is now in use */
/* If any of the calls below fail, the RS_EXITING flag is set. This implies
* that the process will be removed from RS's process table once it has
* terminated. The assumption is that it is not useful to try to restart the
* process later in these failure cases.
*/
if (use_copy)
{
extern char **environ;
/* Copy the executable image into the child process. If this call
* fails, the child process may or may not be killed already. If it is
* not killed, it's blocked because of NO_PRIV. Kill it now either way.
*/
s = dev_execve(child_proc_nr_e, rp->r_exec, rp->r_exec_len, rp->r_argv,
environ);
if (s != OK) {
printf("RS: dev_execve call failed: %d\n", s);
kill(child_pid, SIGKILL);
rp->r_flags |= RS_EXITING; /* don't try again */
return(s);
}
}
/* Set resources when asked to. */
if (rp->r_set_resources)
{
/* Initialize privilege structure. */
init_privs(rp, &rp->r_priv);
/* Tell VM about allowed calls. */
vm_mask = &rpub->vm_call_mask[0];
if ((s = vm_set_priv(child_proc_nr_e, vm_mask)) < 0) {
printf("RS: vm_set_priv call failed: %d\n", s);
kill(child_pid, SIGKILL);
rp->r_flags |= RS_EXITING;
return (s);
}
}
/* Set and synch the privilege structure for the new service. */
if ((s = sys_privctl(child_proc_nr_e, SYS_PRIV_SET_SYS, &rp->r_priv)) != OK
|| (s = sys_getpriv(&rp->r_priv, child_proc_nr_e)) != OK) {
printf("RS: unable to set privileges: %d\n", s);
kill(child_pid, SIGKILL); /* kill the service */
rp->r_flags |= RS_EXITING; /* expect exit */
return(s); /* return error */
}
/* If PCI properties are set, inform the PCI driver about the new service. */
if(rpub->pci_acl.rsp_nr_device || rpub->pci_acl.rsp_nr_class) {
init_pci(rp, child_proc_nr_e);
}
/* Publish the new system service. */
s = publish_service(rp);
if (s != OK) {
printf("RS: warning: publish_service failed: %d\n", s);
}
/* Allow the service to run.
* XXX: We should let the service run/init only after publishing information
* about the new system service, but this is not currently possible due to
* the blocking nature of mapdriver() that expects the service to be running.
* The current solution is not race-free. This hack can go once service
* publishing is made fully asynchronous in RS.
*/
if ((s = sys_privctl(child_proc_nr_e, SYS_PRIV_ALLOW, NULL)) != OK) {
printf("RS: unable to allow the service to run: %d\n", s);
kill(child_pid, SIGKILL); /* kill the service */
rp->r_flags |= RS_EXITING; /* expect exit */
return(s); /* return error */
}
/* Initialize service. */
init_type = rp->r_restarts > 0 ? SEF_INIT_RESTART : SEF_INIT_FRESH;
if((s = init_service(rp, init_type)) != OK) {
panic("unable to initialize service: %d", s);
}
/* The purpose of non-blocking forks is to avoid involving VFS in the forking
* process, because VFS may be blocked on a sendrec() to a MFS that is
* waiting for a endpoint update for a dead driver. We have just published
* that update, but VFS may still be blocked. As a result, VFS may not yet
* have received PM's fork message. Hence, if we call mapdriver()
* immediately, VFS may not know about the process and thus refuse to add the
* driver entry. The following temporary hack works around this by forcing
* blocking communication from PM to VFS. Once VFS has been made non-blocking
* towards MFS instances, this hack and the entire fork_nb() call can go.
*/
if (use_copy)
setuid(0);
/* Map the new service. */
if (rpub->dev_nr > 0) { /* set driver map */
if ((s=mapdriver(rpub->label,
rpub->dev_nr, rpub->dev_style, !!use_copy /* force */)) < 0) {
printf("RS: couldn't map driver (continuing): %d\n", errno);
}
}
if(rs_verbose)
printf("RS: started '%s', major %d, pid %d, endpoint %d, proc %d\n",
rp->r_cmd, rpub->dev_nr, child_pid,
child_proc_nr_e, child_proc_nr_n);
/* The system service now has been successfully started. The only thing
* that can go wrong now, is that execution fails at the child. If that's
* the case, the child will exit.
*/
if(endpoint) *endpoint = child_proc_nr_e; /* send back child endpoint */
return(OK);
}
/*===========================================================================*
* stop_service *
*===========================================================================*/
PRIVATE void stop_service(struct rproc *rp,int how)
{
/* Try to stop the system service. First send a SIGTERM signal to ask the
* system service to terminate. If the service didn't install a signal
* handler, it will be killed. If it did and ignores the signal, we'll
* find out because we record the time here and send a SIGKILL.
*/
if(rs_verbose) printf("RS tries to stop %s (pid %d)\n", rp->r_cmd, rp->r_pid);
rp->r_flags |= how; /* what to on exit? */
if(rp->r_pid > 0) kill(rp->r_pid, SIGTERM); /* first try friendly */
else if(rs_verbose) printf("RS: no process to kill\n");
getuptime(&rp->r_stop_tm); /* record current time */
}
/*===========================================================================*
* do_getsysinfo *
*===========================================================================*/
PUBLIC int do_getsysinfo(m_ptr)
message *m_ptr;
{
vir_bytes src_addr, dst_addr;
int dst_proc;
size_t len;
int s;
/* This call requires special privileges. */
if (!caller_is_root(m_ptr->m_source)) return(EPERM);
switch(m_ptr->m1_i1) {
case SI_PROC_TAB:
src_addr = (vir_bytes) rproc;
len = sizeof(struct rproc) * NR_SYS_PROCS;
break;
case SI_PROCPUB_TAB:
src_addr = (vir_bytes) rprocpub;
len = sizeof(struct rprocpub) * NR_SYS_PROCS;
break;
default:
return(EINVAL);
}
dst_proc = m_ptr->m_source;
dst_addr = (vir_bytes) m_ptr->m1_p1;
if (OK != (s=sys_datacopy(SELF, src_addr, dst_proc, dst_addr, len)))
return(s);
return(OK);
}
/*===========================================================================*
* fork_nb *
*===========================================================================*/
PRIVATE pid_t fork_nb()
{
message m;
return(_syscall(PM_PROC_NR, FORK_NB, &m));
}
/*===========================================================================*
* share_exec *
*===========================================================================*/
PRIVATE int share_exec(rp_dst, rp_src)
struct rproc *rp_dst, *rp_src;
{
struct rprocpub *rpub_src;
struct rprocpub *rpub_dst;
rpub_src = rp_src->r_pub;
rpub_dst = rp_dst->r_pub;
if(rs_verbose) {
printf("RS: share_exec: sharing exec image from %s to %s\n",
rpub_src->label, rpub_dst->label);
}
/* Share exec image from rp_src to rp_dst. */
rp_dst->r_exec_len = rp_src->r_exec_len;
rp_dst->r_exec = rp_src->r_exec;
return OK;
}
/*===========================================================================*
* read_exec *
*===========================================================================*/
PRIVATE int read_exec(rp)
struct rproc *rp;
{
int e, r, fd;
char *e_name;
struct stat sb;
e_name= rp->r_argv[0];
if(rs_verbose) {
printf("RS: read_exec: copying exec image from: %s\n", e_name);
}
r= stat(e_name, &sb);
if (r != 0)
return -errno;
fd= open(e_name, O_RDONLY);
if (fd == -1)
return -errno;
rp->r_exec_len= sb.st_size;
rp->r_exec= malloc(rp->r_exec_len);
if (rp->r_exec == NULL)
{
printf("RS: read_exec: unable to allocate %d bytes\n",
rp->r_exec_len);
close(fd);
return ENOMEM;
}
r= read(fd, rp->r_exec, rp->r_exec_len);
e= errno;
close(fd);
if (r == rp->r_exec_len)
return OK;
printf("RS: read_exec: read failed %d, errno %d\n", r, e);
free(rp->r_exec);
rp->r_exec= NULL;
if (r >= 0)
return EIO;
else
return -e;
}
/*===========================================================================*
* free_slot *
*===========================================================================*/
PRIVATE void free_slot(rp)
struct rproc *rp;
{
int slot_nr, has_shared_exec;
struct rprocpub *rpub;
struct rproc *other_rp;
rpub = rp->r_pub;
/* Free memory if necessary. */
if(rpub->sys_flags & SF_USE_COPY) {
/* Search for some other slot sharing the same exec image. */
has_shared_exec = FALSE;
for (slot_nr = 0; slot_nr < NR_SYS_PROCS; slot_nr++) {
other_rp = &rproc[slot_nr]; /* get pointer to slot */
if (other_rp->r_flags & RS_IN_USE && other_rp != rp
&& other_rp->r_exec == rp->r_exec) { /* found! */
has_shared_exec = TRUE;
}
}
/* If nobody uses our copy of the exec image, we can get rid of it. */
if(!has_shared_exec) {
if(rs_verbose) {
printf("RS: free_slot: free exec image from %s\n",
rpub->label);
}
free(rp->r_exec);
rp->r_exec = NULL;
rp->r_exec_len = 0;
}
}
/* Mark slot as no longer in use.. */
rp->r_flags = 0;
rpub->in_use = FALSE;
rproc_ptr[_ENDPOINT_P(rpub->endpoint)] = NULL;
}
/*===========================================================================*
* run_script *
*===========================================================================*/
PRIVATE void run_script(rp)
struct rproc *rp;
{
int r, endpoint;
pid_t pid;
char *reason;
char incarnation_str[20]; /* Enough for a counter? */
char *envp[1] = { NULL };
struct rprocpub *rpub;
rpub = rp->r_pub;
if (rp->r_flags & RS_REFRESHING)
reason= "restart";
else if (rp->r_flags & RS_NOPINGREPLY)
reason= "no-heartbeat";
else if (rp->r_flags & RS_KILLED)
reason= "killed";
else if (rp->r_flags & RS_CRASHED)
reason= "crashed";
else if (rp->r_flags & RS_SIGNALED)
reason= "signaled";
else
{
printf(
"RS: run_script: can't find reason for termination of '%s'\n",
rpub->label);
return;
}
sprintf(incarnation_str, "%d", rp->r_restarts);
if(rs_verbose) {
printf("RS: calling script '%s'\n", rp->r_script);
printf("RS: sevice name: '%s'\n", rpub->label);
printf("RS: reason: '%s'\n", reason);
printf("RS: incarnation: '%s'\n", incarnation_str);
}
pid= fork();
switch(pid)
{
case -1:
printf("RS: run_script: fork failed: %s\n", strerror(errno));
break;
case 0:
execle(rp->r_script, rp->r_script, rpub->label, reason,
incarnation_str, NULL, envp);
printf("RS: run_script: execl '%s' failed: %s\n",
rp->r_script, strerror(errno));
exit(1);
default:
/* Set the privilege structure for the child process. */
endpoint = getnprocnr(pid);
if ((r = sys_privctl(endpoint, SYS_PRIV_SET_USER, NULL))
!= OK) {
printf("RS: run_script: can't set privileges: %d\n",r);
}
/* Allow the service to run. */
if ((r = sys_privctl(endpoint, SYS_PRIV_ALLOW, NULL)) != OK) {
printf("RS: run_script: process can't run: %d\n",r);
}
/* Do not wait for the child */
break;
}
}
/*===========================================================================*
* get_next_label *
*===========================================================================*/
PRIVATE char *get_next_label(ptr, label, caller_label)
char *ptr;
char *label;
char *caller_label;
{
/* Get the next label from the list of (IPC) labels.
*/
char *p, *q;
size_t len;
for (p= ptr; p[0] != '\0'; p= q)
{
/* Skip leading space */
while (p[0] != '\0' && isspace((unsigned char)p[0]))
p++;
/* Find start of next word */
q= p;
while (q[0] != '\0' && !isspace((unsigned char)q[0]))
q++;
if (q == p)
continue;
len= q-p;
if (len > RS_MAX_LABEL_LEN)
{
printf(
"rs:get_next_label: bad ipc list entry '.*s' for %s: too long\n",
len, p, caller_label);
continue;
}
memcpy(label, p, len);
label[len]= '\0';
return q; /* found another */
}
return NULL; /* done */
}
/*===========================================================================*
* add_forward_ipc *
*===========================================================================*/
PRIVATE void add_forward_ipc(rp, privp)
struct rproc *rp;
struct priv *privp;
{
/* Add IPC send permissions to a process based on that process's IPC
* list.
*/
char label[RS_MAX_LABEL_LEN+1], *p;
struct rproc *tmp_rp;
struct rprocpub *tmp_rpub;
endpoint_t endpoint;
int r;
int slot_nr, priv_id;
struct priv priv;
struct rprocpub *rpub;
rpub = rp->r_pub;
p = rp->r_ipc_list;
while ((p = get_next_label(p, label, rpub->label)) != NULL) {
if (strcmp(label, "SYSTEM") == 0)
endpoint= SYSTEM;
else if (strcmp(label, "USER") == 0)
endpoint= INIT_PROC_NR; /* all user procs */
else if (strcmp(label, "PM") == 0)
endpoint= PM_PROC_NR;
else if (strcmp(label, "VFS") == 0)
endpoint= FS_PROC_NR;
else if (strcmp(label, "RS") == 0)
endpoint= RS_PROC_NR;
else if (strcmp(label, "LOG") == 0)
endpoint= LOG_PROC_NR;
else if (strcmp(label, "TTY") == 0)
endpoint= TTY_PROC_NR;
else if (strcmp(label, "DS") == 0)
endpoint= DS_PROC_NR;
else if (strcmp(label, "VM") == 0)
endpoint= VM_PROC_NR;
else
{
/* Try to find process */
for (slot_nr = 0; slot_nr < NR_SYS_PROCS;
slot_nr++)
{
tmp_rp = &rproc[slot_nr];
if (!(tmp_rp->r_flags & RS_IN_USE))
continue;
tmp_rpub = tmp_rp->r_pub;
if (strcmp(tmp_rpub->label, label) == 0)
break;
}
if (slot_nr >= NR_SYS_PROCS)
{
if (rs_verbose)
printf(
"add_forward_ipc: unable to find '%s'\n", label);
continue;
}
endpoint= tmp_rpub->endpoint;
}
if ((r = sys_getpriv(&priv, endpoint)) < 0)
{
printf(
"add_forward_ipc: unable to get priv_id for '%s': %d\n",
label, r);
continue;
}
priv_id= priv.s_id;
set_sys_bit(privp->s_ipc_to, priv_id);
}
}
/*===========================================================================*
* add_backward_ipc *
*===========================================================================*/
PRIVATE void add_backward_ipc(rp, privp)
struct rproc *rp;
struct priv *privp;
{
/* Add IPC send permissions to a process based on other processes' IPC
* lists. This is enough to allow each such two processes to talk to
* each other, as the kernel guarantees send mask symmetry. We need to
* add these permissions now because the current process may not yet
* have existed at the time that the other process was initialized.
*/
char label[RS_MAX_LABEL_LEN+1], *p;
struct rproc *rrp;
struct rprocpub *rrpub;
int priv_id, found;
for (rrp=BEG_RPROC_ADDR; rrp<END_RPROC_ADDR; rrp++) {
if (!(rrp->r_flags & RS_IN_USE))
continue;
/* If an IPC target list was provided for the process being
* checked here, make sure that the label of the new process
* is in that process's list.
*/
if (rrp->r_ipc_list[0]) {
found = 0;
rrpub = rrp->r_pub;
p = rrp->r_ipc_list;
while ((p = get_next_label(p, label,
rrpub->label)) != NULL) {
if (!strcmp(rrpub->label, label)) {
found = 1;
break;
}
}
if (!found)
continue;
}
priv_id= rrp->r_priv.s_id;
set_sys_bit(privp->s_ipc_to, priv_id);
}
}
/*===========================================================================*
* init_privs *
*===========================================================================*/
PRIVATE void init_privs(rp, privp)
struct rproc *rp;
struct priv *privp;
{
int i, src_bits_per_word, dst_bits_per_word, src_word, dst_word,
src_bit, call_nr;
unsigned long mask;
/* Clear s_k_call_mask */
memset(privp->s_k_call_mask, '\0', sizeof(privp->s_k_call_mask));
src_bits_per_word= 8*sizeof(rp->r_call_mask[0]);
dst_bits_per_word= 8*sizeof(privp->s_k_call_mask[0]);
for (src_word= 0; src_word < RS_SYS_CALL_MASK_SIZE; src_word++)
{
for (src_bit= 0; src_bit < src_bits_per_word; src_bit++)
{
mask= (1UL << src_bit);
if (!(rp->r_call_mask[src_word] & mask))
continue;
call_nr= src_word*src_bits_per_word+src_bit;
#if 0
if(rs_verbose)
printf("RS: init_privs: system call %d\n", call_nr);
#endif
dst_word= call_nr / dst_bits_per_word;
mask= (1UL << (call_nr % dst_bits_per_word));
if (dst_word >= SYS_CALL_MASK_SIZE)
{
printf(
"RS: init_privs: call number %d doesn't fit\n",
call_nr);
}
privp->s_k_call_mask[dst_word] |= mask;
}
}
/* Clear s_ipc_to */
memset(&privp->s_ipc_to, '\0', sizeof(privp->s_ipc_to));
if (strlen(rp->r_ipc_list) != 0)
{
add_forward_ipc(rp, privp);
add_backward_ipc(rp, privp);
}
else
{
for (i= 0; i<NR_SYS_PROCS; i++)
{
if (i != USER_PRIV_ID)
set_sys_bit(privp->s_ipc_to, i);
}
}
}
/*===========================================================================*
* init_pci *
*===========================================================================*/
PRIVATE void init_pci(rp, endpoint)
struct rproc *rp;
int endpoint;
{
/* Inform the PCI driver about the new service. */
size_t len;
int i, r;
struct rs_pci rs_pci;
struct rprocpub *rpub;
rpub = rp->r_pub;
rs_pci = rpub->pci_acl;
strcpy(rs_pci.rsp_label, rpub->label);
rs_pci.rsp_endpoint= endpoint;
if(rs_verbose)
printf("RS: init_pci: calling pci_set_acl\n");
r= pci_set_acl(&rs_pci);
if(rs_verbose)
printf("RS: init_pci: after pci_set_acl\n");
if (r != OK)
{
printf("RS: init_pci: pci_set_acl failed: %s\n",
strerror(errno));
return;
}
}
/*===========================================================================*
* do_lookup *
*===========================================================================*/
PUBLIC int do_lookup(m_ptr)
message *m_ptr;
{
static char namebuf[100];
int len, r;
struct rproc *rrp;
struct rprocpub *rrpub;
len = m_ptr->RS_NAME_LEN;
if(len < 2 || len >= sizeof(namebuf)) {
printf("RS: len too weird (%d)\n", len);
return EINVAL;
}
if((r=sys_vircopy(m_ptr->m_source, D, (vir_bytes) m_ptr->RS_NAME,
SELF, D, (vir_bytes) namebuf, len)) != OK) {
printf("RS: name copy failed\n");
return r;
}
namebuf[len] = '\0';
for (rrp=BEG_RPROC_ADDR; rrp<END_RPROC_ADDR; rrp++) {
if (!(rrp->r_flags & RS_IN_USE))
continue;
rrpub = rrp->r_pub;
if (!strcmp(rrpub->label, namebuf)) {
m_ptr->RS_ENDPOINT = rrpub->endpoint;
return OK;
}
}
return ESRCH;
}
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