blob: 9e267bc757d68518ec81eaab63986dfc3453c36a [file] [log] [blame]
#include <stdio.h>
#include <dlfcn.h>
#include <iostream>
#include <unistd.h>
#include <assert.h>
#include <dirent.h>
#include <systemd/sd-bus.h>
#include <string.h>
#include <stdlib.h>
#include <map>
#include "ipmid.hpp"
#include <sys/time.h>
#include <errno.h>
#include <mapper.h>
#include "sensorhandler.h"
#include <vector>
#include <algorithm>
#include <iterator>
#include <ipmiwhitelist.hpp>
sd_bus *bus = NULL;
sd_bus_slot *ipmid_slot = NULL;
// Initialise restricted mode to true
bool restricted_mode = true;
FILE *ipmiio, *ipmidbus, *ipmicmddetails;
void print_usage(void) {
fprintf(stderr, "Options: [-d mask]\n");
fprintf(stderr, " mask : 0x01 - Print ipmi packets\n");
fprintf(stderr, " mask : 0x02 - Print DBUS operations\n");
fprintf(stderr, " mask : 0x04 - Print ipmi command details\n");
fprintf(stderr, " mask : 0xFF - Print all trace\n");
}
// Host settings in DBUS
constexpr char settings_host_object[] = "/org/openbmc/settings/host0";
constexpr char settings_host_intf[] = "org.freedesktop.DBus.Properties";
const char * DBUS_INTF = "org.openbmc.HostIpmi";
const char * FILTER = "type='signal',interface='org.openbmc.HostIpmi',member='ReceivedMessage'";
constexpr char RESTRICTED_MODE_FILTER[] = "type='signal',interface='org.freedesktop.DBus.Properties',path='/org/openbmc/settings/host0'";
typedef std::pair<ipmi_netfn_t, ipmi_cmd_t> ipmi_fn_cmd_t;
typedef std::pair<ipmid_callback_t, ipmi_context_t> ipmi_fn_context_t;
// Global data structure that contains the IPMI command handler's registrations.
std::map<ipmi_fn_cmd_t, ipmi_fn_context_t> g_ipmid_router_map;
// IPMI Spec, shared Reservation ID.
unsigned short g_sel_reserve = 0xFFFF;
unsigned short get_sel_reserve_id(void)
{
return g_sel_reserve;
}
#ifndef HEXDUMP_COLS
#define HEXDUMP_COLS 16
#endif
void hexdump(FILE *s, void *mem, size_t len)
{
unsigned int i, j;
for(i = 0; i < len + ((len % HEXDUMP_COLS) ? (HEXDUMP_COLS - len % HEXDUMP_COLS) : 0); i++)
{
/* print offset */
if(i % HEXDUMP_COLS == 0)
{
fprintf(s,"0x%06x: ", i);
}
/* print hex data */
if(i < len)
{
fprintf(s,"%02x ", 0xFF & ((char*)mem)[i]);
}
else /* end of block, just aligning for ASCII dump */
{
fprintf(s," ");
}
/* print ASCII dump */
if(i % HEXDUMP_COLS == (HEXDUMP_COLS - 1))
{
for(j = i - (HEXDUMP_COLS - 1); j <= i; j++)
{
if(j >= len) /* end of block, not really printing */
{
fputc(' ', s);
}
else if(isprint(((char*)mem)[j])) /* printable char */
{
fputc(0xFF & ((char*)mem)[j], s);
}
else /* other char */
{
fputc('.',s);
}
}
fputc('\n',s);
}
}
}
// Method that gets called by shared libraries to get their command handlers registered
void ipmi_register_callback(ipmi_netfn_t netfn, ipmi_cmd_t cmd,
ipmi_context_t context, ipmid_callback_t handler)
{
// Pack NetFn and Command in one.
auto netfn_and_cmd = std::make_pair(netfn, cmd);
// Pack Function handler and Data in another.
auto handler_and_context = std::make_pair(handler, context);
// Check if the registration has already been made..
auto iter = g_ipmid_router_map.find(netfn_and_cmd);
if(iter != g_ipmid_router_map.end())
{
fprintf(stderr,"ERROR : Duplicate registration for NetFn [0x%X], Cmd:[0x%X]\n",netfn, cmd);
}
else
{
// This is a fresh registration.. Add it to the map.
g_ipmid_router_map.emplace(netfn_and_cmd, handler_and_context);
}
return;
}
// Looks at the map and calls corresponding handler functions.
ipmi_ret_t ipmi_netfn_router(ipmi_netfn_t netfn, ipmi_cmd_t cmd, ipmi_request_t request,
ipmi_response_t response, ipmi_data_len_t data_len)
{
// return from the Command handlers.
ipmi_ret_t rc = IPMI_CC_INVALID;
// If restricted mode is true and command is not whitelisted, don't
// execute the command
if(restricted_mode)
{
if (!std::binary_search(whitelist.cbegin(), whitelist.cend(),
std::make_pair(netfn, cmd)))
{
printf("Net function:[0x%X], Command:[0x%X] is not whitelisted\n",
netfn, cmd);
rc = IPMI_CC_INSUFFICIENT_PRIVILEGE;
memcpy(response, &rc, IPMI_CC_LEN);
*data_len = IPMI_CC_LEN;
return rc;
}
}
// Walk the map that has the registered handlers and invoke the approprite
// handlers for matching commands.
auto iter = g_ipmid_router_map.find(std::make_pair(netfn, cmd));
if(iter == g_ipmid_router_map.end())
{
fprintf(stderr, "No registered handlers for NetFn:[0x%X], Cmd:[0x%X]"
" trying Wilcard implementation \n",netfn, cmd);
// Now that we did not find any specific [NetFn,Cmd], tuple, check for
// NetFn, WildCard command present.
iter = g_ipmid_router_map.find(std::make_pair(netfn, IPMI_CMD_WILDCARD));
if(iter == g_ipmid_router_map.end())
{
fprintf(stderr, "No Registered handlers for NetFn:[0x%X],Cmd:[0x%X]\n",netfn, IPMI_CMD_WILDCARD);
// Respond with a 0xC1
memcpy(response, &rc, IPMI_CC_LEN);
*data_len = IPMI_CC_LEN;
return rc;
}
}
#ifdef __IPMI_DEBUG__
// We have either a perfect match -OR- a wild card atleast,
printf("Calling Net function:[0x%X], Command:[0x%X]\n", netfn, cmd);
#endif
// Extract the map data onto appropriate containers
auto handler_and_context = iter->second;
// Creating a pointer type casted to char* to make sure we advance 1 byte
// when we advance pointer to next's address. advancing void * would not
// make sense.
char *respo = &((char *)response)[IPMI_CC_LEN];
// Response message from the plugin goes into a byte post the base response
rc = (handler_and_context.first) (netfn, cmd, request, respo,
data_len, handler_and_context.second);
// Now copy the return code that we got from handler and pack it in first
// byte.
memcpy(response, &rc, IPMI_CC_LEN);
// Data length is now actual data + completion code.
*data_len = *data_len + IPMI_CC_LEN;
return rc;
}
static int send_ipmi_message(sd_bus_message *req, unsigned char seq, unsigned char netfn, unsigned char lun, unsigned char cmd, unsigned char cc, unsigned char *buf, unsigned char len) {
sd_bus_error error = SD_BUS_ERROR_NULL;
sd_bus_message *reply = NULL, *m=NULL;
const char *dest, *path;
int r, pty;
dest = sd_bus_message_get_sender(req);
path = sd_bus_message_get_path(req);
r = sd_bus_message_new_method_call(bus,&m,dest,path,DBUS_INTF,"sendMessage");
if (r < 0) {
fprintf(stderr, "Failed to add the method object: %s\n", strerror(-r));
return -1;
}
// Responses in IPMI require a bit set. So there ya go...
netfn |= 0x01;
// Add the bytes needed for the methods to be called
r = sd_bus_message_append(m, "yyyyy", seq, netfn, lun, cmd, cc);
if (r < 0) {
fprintf(stderr, "Failed add the netfn and others : %s\n", strerror(-r));
goto final;
}
r = sd_bus_message_append_array(m, 'y', buf, len);
if (r < 0) {
fprintf(stderr, "Failed to add the string of response bytes: %s\n", strerror(-r));
goto final;
}
// Call the IPMI responder on the bus so the message can be sent to the CEC
r = sd_bus_call(bus, m, 0, &error, &reply);
if (r < 0) {
fprintf(stderr, "Failed to call the method: %s\n", strerror(-r));
fprintf(stderr, "Dest: %s, Path: %s\n", dest, path);
goto final;
}
r = sd_bus_message_read(reply, "x", &pty);
if (r < 0) {
fprintf(stderr, "Failed to get a rc from the method: %s\n", strerror(-r));
}
final:
sd_bus_error_free(&error);
m = sd_bus_message_unref(m);
reply = sd_bus_message_unref(reply);
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
void cache_restricted_mode()
{
sd_bus *bus = ipmid_get_sd_bus_connection();
sd_bus_message *reply = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
int rc = 0;
char *busname = NULL;
rc = mapper_get_service(bus, settings_host_object, &busname);
if (rc < 0) {
fprintf(stderr, "Failed to get HOST busname: %s\n", strerror(-rc));
goto cleanup;
}
rc = sd_bus_call_method(bus,
busname,
settings_host_object,
settings_host_intf,
"Get",
&error,
&reply,
"ss",
"org.openbmc.settings.Host",
"restricted_mode");
if(rc < 0)
{
fprintf(stderr, "Failed sd_bus_call_method method for restricted mode: %s\n",
strerror(-rc));
goto cleanup;
}
rc = sd_bus_message_read(reply, "v", "b", &restricted_mode);
if(rc < 0)
{
fprintf(stderr, "Failed to parse response message for restricted mode: %s\n",
strerror(-rc));
// Fail-safe to restricted mode
restricted_mode = true;
}
printf("Restricted mode = %d\n", restricted_mode);
cleanup:
sd_bus_error_free(&error);
reply = sd_bus_message_unref(reply);
free(busname);
}
static int handle_restricted_mode_change(sd_bus_message *m, void *user_data,
sd_bus_error *ret_error)
{
cache_restricted_mode();
return 0;
}
static int handle_ipmi_command(sd_bus_message *m, void *user_data, sd_bus_error
*ret_error) {
int r = 0;
unsigned char sequence, netfn, lun, cmd;
const void *request;
size_t sz;
size_t resplen =MAX_IPMI_BUFFER;
unsigned char response[MAX_IPMI_BUFFER];
memset(response, 0, MAX_IPMI_BUFFER);
r = sd_bus_message_read(m, "yyyy", &sequence, &netfn, &lun, &cmd);
if (r < 0) {
fprintf(stderr, "Failed to parse signal message: %s\n", strerror(-r));
return -1;
}
r = sd_bus_message_read_array(m, 'y', &request, &sz );
if (r < 0) {
fprintf(stderr, "Failed to parse signal message: %s\n", strerror(-r));
return -1;
}
fprintf(ipmiio, "IPMI Incoming: Seq 0x%02x, NetFn 0x%02x, CMD: 0x%02x \n", sequence, netfn, cmd);
hexdump(ipmiio, (void*)request, sz);
// Allow the length field to be used for both input and output of the
// ipmi call
resplen = sz;
// Now that we have parsed the entire byte array from the caller
// we can call the ipmi router to do the work...
r = ipmi_netfn_router(netfn, cmd, (void *)request, (void *)response, &resplen);
if(r != 0)
{
fprintf(stderr,"ERROR:[0x%X] handling NetFn:[0x%X], Cmd:[0x%X]\n",r, netfn, cmd);
if(r < 0) {
response[0] = IPMI_CC_UNSPECIFIED_ERROR;
}
}
fprintf(ipmiio, "IPMI Response:\n");
hexdump(ipmiio, (void*)response, resplen);
// Send the response buffer from the ipmi command
r = send_ipmi_message(m, sequence, netfn, lun, cmd, response[0],
((unsigned char *)response) + 1, resplen - 1);
if (r < 0) {
fprintf(stderr, "Failed to send the response message\n");
return -1;
}
return 0;
}
//----------------------------------------------------------------------
// handler_select
// Select all the files ending with with .so. in the given diretcory
// @d: dirent structure containing the file name
//----------------------------------------------------------------------
int handler_select(const struct dirent *entry)
{
// To hold ".so" from entry->d_name;
char dname_copy[4] = {0};
// We want to avoid checking for everything and isolate to the ones having
// .so.* or .so in them.
// Check for versioned libraries .so.*
if(strstr(entry->d_name, IPMI_PLUGIN_SONAME_EXTN))
{
return 1;
}
// Check for non versioned libraries .so
else if(strstr(entry->d_name, IPMI_PLUGIN_EXTN))
{
// It is possible that .so could be anywhere in the string but unlikely
// But being careful here. Get the base address of the string, move
// until end and come back 3 steps and that gets what we need.
strcpy(dname_copy, (entry->d_name + strlen(entry->d_name)-strlen(IPMI_PLUGIN_EXTN)));
if(strcmp(dname_copy, IPMI_PLUGIN_EXTN) == 0)
{
return 1;
}
}
return 0;
}
// This will do a dlopen of every .so in ipmi_lib_path and will dlopen everything so that they will
// register a callback handler
void ipmi_register_callback_handlers(const char* ipmi_lib_path)
{
// For walking the ipmi_lib_path
struct dirent **handler_list;
int num_handlers = 0;
// This is used to check and abort if someone tries to register a bad one.
void *lib_handler = NULL;
if(ipmi_lib_path == NULL)
{
fprintf(stderr,"ERROR; No handlers to be registered for ipmi.. Aborting\n");
assert(0);
}
else
{
// 1: Open ipmi_lib_path. Its usually "/usr/lib/phosphor-host-ipmid"
// 2: Scan the directory for the files that end with .so
// 3: For each one of them, just do a 'dlopen' so that they register
// the handlers for callback routines.
std::string handler_fqdn = ipmi_lib_path;
// Append a "/" since we need to add the name of the .so. If there is
// already a .so, adding one more is not any harm.
handler_fqdn += "/";
num_handlers = scandir(ipmi_lib_path, &handler_list, handler_select, alphasort);
if (num_handlers < 0)
return;
while(num_handlers--)
{
handler_fqdn = ipmi_lib_path;
handler_fqdn += handler_list[num_handlers]->d_name;
printf("Registering handler:[%s]\n",handler_fqdn.c_str());
lib_handler = dlopen(handler_fqdn.c_str(), RTLD_NOW);
if(lib_handler == NULL)
{
fprintf(stderr,"ERROR opening [%s]: %s\n",
handler_fqdn.c_str(), dlerror());
}
// Wipe the memory allocated for this particular entry.
free(handler_list[num_handlers]);
}
// Done with all registration.
free(handler_list);
}
// TODO : What to be done on the memory that is given by dlopen ?.
return;
}
sd_bus *ipmid_get_sd_bus_connection(void) {
return bus;
}
sd_bus_slot *ipmid_get_sd_bus_slot(void) {
return ipmid_slot;
}
int main(int argc, char *argv[])
{
int r;
unsigned long tvalue;
int c;
// This file and subsequient switch is for turning on levels
// of trace
ipmicmddetails = ipmiio = ipmidbus = fopen("/dev/null", "w");
while ((c = getopt (argc, argv, "h:d:")) != -1)
switch (c) {
case 'd':
tvalue = strtoul(optarg, NULL, 16);
if (1&tvalue) {
ipmiio = stdout;
}
if (2&tvalue) {
ipmidbus = stdout;
}
if (4&tvalue) {
ipmicmddetails = stdout;
}
break;
case 'h':
case '?':
print_usage();
return 1;
}
/* Connect to system bus */
r = sd_bus_open_system(&bus);
if (r < 0) {
fprintf(stderr, "Failed to connect to system bus: %s\n",
strerror(-r));
goto finish;
}
// Register all the handlers that provider implementation to IPMI commands.
ipmi_register_callback_handlers(HOST_IPMI_LIB_PATH);
// Watch for BT messages
r = sd_bus_add_match(bus, &ipmid_slot, FILTER, handle_ipmi_command, NULL);
if (r < 0) {
fprintf(stderr, "Failed: sd_bus_add_match: %s : %s\n", strerror(-r), FILTER);
goto finish;
}
// Wait for changes on Restricted mode
r = sd_bus_add_match(bus, &ipmid_slot, RESTRICTED_MODE_FILTER, handle_restricted_mode_change, NULL);
if (r < 0) {
fprintf(stderr, "Failed: sd_bus_add_match: %s : %s\n", strerror(-r), RESTRICTED_MODE_FILTER);
goto finish;
}
// Initialise restricted mode
cache_restricted_mode();
for (;;) {
/* Process requests */
r = sd_bus_process(bus, NULL);
if (r < 0) {
fprintf(stderr, "Failed to process bus: %s\n", strerror(-r));
goto finish;
}
if (r > 0) {
continue;
}
r = sd_bus_wait(bus, (uint64_t) - 1);
if (r < 0) {
fprintf(stderr, "Failed to wait on bus: %s\n", strerror(-r));
goto finish;
}
}
finish:
sd_bus_slot_unref(ipmid_slot);
sd_bus_unref(bus);
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}