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Initial stuff for the new examples;

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v0.5.xx
Alexander Vdolainen 9 years ago
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/*
* Secure X Message Passing Library v2 examples.
*
* (c) Alexander Vdolainen 2013-2015 <avdolainen@gmail.com>
*
* libsxmp is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* libsxmp 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.";
*
*/
/*
* This is an example of sxmp usage.
* NOTE: It was developed quite fast within one day,
* btw - this the reason of some ugly code here.
*
* This is a master or simply - daemon part, it will
* listen a requests and create a stream with directory entries,
* which ridden by the client.
* This implements a simple client-server topology, to see
* more advanced technics check out other examples.
*
* NOTE(win32): don't have a time to test it or fix it to
* make it works on windows, if you can - u're welcome.
*/
#include <stdio.h>
#include <dirent.h>
#define __USE_GNU
#include <stdlib.h>
#include <stdarg.h>
#include <sys/types.h>
#include <limits.h>
#include <sys/select.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/resource.h>
#include <netdb.h>
#include <unistd.h>
#include <uuid/uuid.h>
#include <execinfo.h>
#include <netinet/in.h>
#include <tdata/usrtc.h>
#include <sexpr/sexp.h>
#include <sxmp/limits.h>
#include <sxmp/sxmp.h>
#include <pthread.h>
#include <stdint.h>
#include <getopt.h>
#include <errno.h>
#define DEBUG
#define FREE(x) { if (x) { free(x); x = NULL; } }
#define MAX_STREAMS INT_MAX
/*
* type used to stream a directory contents
* in case of lot of files we cannot send it
* within one message.
*/
typedef struct __datastream_type {
int dsid;
usrtc_node_t node;
DIR *dp;
struct dirent dent;
struct dirent *dres;
} datastream_t;
/* ugly, but no so important here */
static usrtc_t *_rd_streams;
static int _rd_last_id = 0;
static pthread_rwlock_t _lock;
/* some helper functions, not any serios stuff */
static long __cmp_int(const void *a, const void *b)
{
return *(int *)a - *(int *)b;
}
static inline void dump_dirent(struct dirent *d, char *buf)
{
if (d == NULL) return;
strcat(buf, "\"");
strcat(buf, d->d_name);
strcat(buf, "\" ");
switch(d->d_type) {
case DT_REG: strcat(buf, "\"regular\""); break;
case DT_DIR: strcat(buf, "\"directory\""); break;
case DT_BLK: strcat(buf, "\"block\""); break;
case DT_CHR: strcat(buf, "\"char\""); break;
case DT_FIFO: strcat(buf, "\"fifo\""); break;
case DT_LNK: strcat(buf, "\"link\""); break;
case DT_UNKNOWN: strcat(buf, "\"unknown\""); break;
default: strcat(buf, "\"another\""); break;
}
}
/* just a stupid function to open listener on the specified port */
static int __openlistener(int port)
{
int sd;
struct sockaddr_in addr;
sd = socket(PF_INET, SOCK_STREAM, 0);
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = INADDR_ANY;
if(bind(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0) {
perror("can't bind port");
abort();
}
if(listen(sd, 10) != 0) {
perror("Can't configure listening port");
abort();
}
return sd;
}
/* firstly we need to take an rpc calls data,
* sxmp uses usrtc from libtdata to store it
*/
static usrtc_t *fulist;
/* ok, here we will define out sxmp specific functions */
/*
* RPC list contain groups of RPC calls called channel types
* for each sxmp link depends on access rules you can change
* available channel types.
* To do so you must provide a special callback returning this list.
* Since we haven't any access restrictions in our example, just
* create a fake.
*/
static usrtc_t *__rettlist(sxlink_t *l)
{
return fulist;
}
/*
* Each sxmp link validated by certificate ID,
* i.e. when basic checking is done, you can also
* review the certificate ID, for example you need
* to disable certificate for a time being.
*
* Here we don't have those checks, just always accept
*/
static int __validate_sslpem(sxlink_t *l)
{
return 0;
}
/*
* To be more paranoic, sxmp also allow to
* check up username and password.
* We don't overview this tuff here, just
* always allow.
*/
static int __secure_check(conn_t *co)
{
return SXE_SUCCESS;
}
/* Our RPC functions it used to get a message and reply */
static int __dir_open(void *m, sexp_t *sx)
{
sexp_t *lsx = NULL;
sxmsg_t *msg = (sxmsg_t *)m;
char *buf;
size_t ln = 0;
if(sexp_list_cdr(sx, &lsx) || !sx->list->next || !sx->list->next->val) {
fprintf(stderr, "Invalid protocol\n");
return sxmsg_return(msg, SXE_BADPROTO);
}
char *dir_name = strdup(sx->list->next->val);
if ( usrtc_isfull(_rd_streams) ) {
return sxmsg_return(msg, SXE_TOOLONG);
}
datastream_t *item;
if ( !(item = malloc(sizeof(datastream_t))) ) {
return sxmsg_return(msg, SXE_ENOMEM);
}
/* find free id */
pthread_rwlock_wrlock(&_lock);
do {
if (_rd_last_id == INT_MAX)
_rd_last_id = 1;
else
++_rd_last_id;
} while (usrtc_lookup(_rd_streams, &_rd_last_id));
/* create rd stream */
DIR *dp = NULL;
if ( !(dp = opendir(dir_name)) ) {
pthread_rwlock_unlock(&_lock);
FREE(item);
FREE(dir_name);
return sxmsg_return(msg, SXE_FAILED);
}
FREE(dir_name);
/* init stream */
item->dsid = _rd_last_id;
item->dp = dp;
item->dres = NULL;
usrtc_node_init(&(item->node), item);
usrtc_insert(_rd_streams, &(item->node), &item->dsid);
buf = sxmsg_rapidbuf(msg);
ln = snprintf(buf, MAX_RBBUF_LEN, "(dir-stream %d)", item->dsid);
pthread_rwlock_unlock(&_lock);
return sxmsg_rreply(msg, ln + 1);
}
static int __dir_read(void *m, sexp_t *sx)
{
sexp_t *lsx = NULL;
sxmsg_t *msg = (sxmsg_t *)m;
char *buf;
size_t ln = 0;
int stid = -1;
if (sexp_list_cdr(sx, &lsx) || !sx->list->next || !sx->list->next->val
|| (0 >= (stid = atoi(sx->list->next->val) )) )
{
fprintf(stderr, "Invalid protocol\n");
return sxmsg_return(msg, SXE_BADPROTO);
}
/* get stream item */
datastream_t *item;
usrtc_node_t *node;
pthread_rwlock_rdlock(&_lock);
if ( !(node = usrtc_lookup(_rd_streams, &stid)) ) {
pthread_rwlock_unlock(&_lock);
return sxmsg_return(msg, SXE_INVALINDEX);
}
pthread_rwlock_unlock(&_lock);
pthread_rwlock_wrlock(&_lock);
item = usrtc_node_getdata(node);
if (readdir_r(item->dp, &(item->dent), &(item->dres))) {
pthread_rwlock_unlock(&_lock);
return sxmsg_return(msg, SXE_FAILED);
}
if (!item->dres) {
buf = sxmsg_rapidbuf(msg);
ln = snprintf(buf, MAX_RBBUF_LEN, "(dir-end %d)", item->dsid);
goto __finish;
}
char dump[2048];
sprintf(dump, "(dir-entry (");
dump_dirent(item->dres, dump);
strcat(dump, "))");
buf = sxmsg_rapidbuf(msg);
ln = snprintf(buf, MAX_RBBUF_LEN, "%s", dump);
__finish:
pthread_rwlock_unlock(&_lock);
return sxmsg_rreply(msg, ln + 1);
}
static int __dir_close(void *m, sexp_t *sx)
{
sexp_t *lsx = NULL;
sxmsg_t *msg = (sxmsg_t *)m;
int stid = -1;
if (sexp_list_cdr(sx, &lsx) || !sx->list->next || !sx->list->next->val
|| (0 >= (stid = atoi(sx->list->next->val) )) )
{
fprintf(stderr, "Invalid protocol\n");
return sxmsg_return(msg, SXE_BADPROTO);
}
/* get stream item */
datastream_t *item;
usrtc_node_t *node;
pthread_rwlock_rdlock(&_lock);
if ( !(node = usrtc_lookup(_rd_streams, &stid)) ) {
pthread_rwlock_unlock(&_lock);
return sxmsg_return(msg, ENOENT);
}
pthread_rwlock_unlock(&_lock);
pthread_rwlock_wrlock(&_lock);
item = usrtc_node_getdata(node);
closedir(item->dp);
usrtc_delete(_rd_streams, node);
FREE(item);
pthread_rwlock_unlock(&_lock);
return sxmsg_return(msg, SXE_SUCCESS);
}
#define DEFAULT_PORT 10240
int main(int argc, char **argv)
{
char *rootca = NULL, *cert = NULL;
sxhub_t *sxmphub = sxhub_create();
int port = DEFAULT_PORT;
int opt;
while((opt = getopt(argc, argv, "p:r:u:")) != -1) {
switch(opt) {
case 'p':
port = atoi(optarg);
break;
case 'r':
rootca = strdup(optarg);
break;
case 'u':
cert = strdup(optarg);
break;
default:
fprintf(stderr, "usage: %s [-p <PORTNUM>] -r <PATH to Root CA> -u <PATH"
" to SSL certificate>\n", argv[0]);
return EINVAL;
}
}
if(!rootca) {
fprintf(stderr, "Root CA not pointed.\n Failure.\n");
return EINVAL;
}
if(!cert) {
fprintf(stderr, "User certificate not pointed.\n Failure.\n");
return EINVAL;
}
sxmp_init();
/* all is fine let's init connection subsystem */
if(!sxmphub) {
fprintf(stderr, "Subsystem init failed: %d\n", opt);
return 2;
}
/* set working certificates */
opt = sxhub_setsslserts(sxmphub, rootca, cert, cert);
if(opt) {
fprintf(stderr, "Subsystem init failed (set SSL x.509 pems): %d\n", opt);
return opt;
}
/* clean up */
free(rootca);
free(cert);
/* set important callbacks to do the security checking */
sxhub_set_authcheck(sxmphub, __secure_check);
sxhub_set_sslvalidate(sxmphub, __validate_sslpem);
/* ok, now we need to construct RPC lists (channels) */
if(!(fulist = malloc(sizeof(usrtc_t)))) {
fprintf(stderr, "Cannot allocate memory for RPC lists\n Failure.\n");
return ENOMEM;
}
opt = sxmp_rpclist_init(fulist);
if(opt) {
fprintf(stderr, "Failed to init rpc list\n Failure.\n");
return opt;
}
/* we will add one channel with type id 12 "Demo rpc list" */
opt = sxmp_rpclist_add(fulist, 12, "Demo RPC list", NULL);
if(opt) {
fprintf(stderr, "Failed to add typed RPC channel\n Failure.\n");
return opt;
}
opt = sxmp_rpclist_add(fulist, 1, "Public", NULL);
if(opt) {
fprintf(stderr, "Failed to add typed RPC channel\n Failure.\n");
return opt;
}
/* ok, let's add stream functions */
opt = sxmp_rpclist_add_function(fulist, 12, "dir-open", __dir_open);
if(opt) {
__fail:
fprintf(stderr, "Failed to add functions to typed RPC channel\n Failure.\n");
return opt;
}
opt = sxmp_rpclist_add_function(fulist, 12, "dir-read", __dir_read);
if(opt) goto __fail;
opt = sxmp_rpclist_add_function(fulist, 12, "dir-close", __dir_close);
if(opt) goto __fail;
/* ok, setup it */
sxhub_set_rpcvalidator(sxmphub, __rettlist);
/* create stream tree */
if(!(_rd_streams = malloc(sizeof(usrtc_t)) ))
return ENOMEM;
usrtc_init(_rd_streams, USRTC_REDBLACK, MAX_STREAMS, __cmp_int);
signal(SIGPIPE, SIG_IGN);
/* now we're ready to run the listen process */
int srv = __openlistener(port);
while(1) {
struct sockaddr_in addr;
socklen_t len = sizeof(addr);
sxlink_t *link;
int client = accept(srv, (struct sockaddr*)&addr, &len); /* accept connection as usual */
link = sxlink_master_accept(sxmphub, client, NULL);
if(!link) fprintf(stderr, "Cannot create sxmp link (%d)\n", errno);
}
sxhub_destroy(sxmphub);
sxmp_finalize();
return 0;
}
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