/*
* Retrieve a process's psinfo via an already-opened or new file descriptor.
* The supplied descriptor will be closed on failure. An optional callback
* will be invoked with the last descriptor tried, and a supplied callback
* argument, as its arguments, such that the new descriptor may be cached, or
* an old one may be invalidated. If the result of the callback is zero, the
* the caller is to assume responsibility for the file descriptor, to close it
* with rfd_close().
*
* On failure, a nonzero value is returned.
*/
int
get_psinfo(pid_t pid, psinfo_t *psinfo, int cached_fd,
int(*fd_update_cb)(void *, int), void *arg, lprocess_t *lpc)
{
int fd;
int can_try_uncached;
ASSERT(!(cached_fd > 0 && fd_update_cb == NULL));
do {
if (cached_fd >= 0) {
fd = cached_fd;
can_try_uncached = 1;
debug_high("%d/psinfo, trying cached fd %d\n",
(int)pid, fd);
} else {
char pathbuf[PROC_PATH_MAX];
can_try_uncached = 0;
(void) snprintf(pathbuf, sizeof (pathbuf),
"/proc/%d/psinfo", (int)pid);
if ((fd = rfd_open(pathbuf, 1, RFD_PSINFO,
revoke_psinfo, lpc, O_RDONLY, 0000)) < 0) {
debug("cannot open %s", pathbuf);
break;
} else
debug_high("opened %s, fd %d\n", pathbuf, fd);
}
if (pread(fd, psinfo, sizeof (*psinfo), 0) ==
sizeof (*psinfo) && psinfo->pr_pid == pid)
break;
else {
debug_high("closed fd %d\n", fd);
if (rfd_close(fd) != 0)
debug("could not close fd %d", fd);
fd = cached_fd = -1;
}
} while (can_try_uncached == 1);
if (fd_update_cb == NULL || fd_update_cb(arg, fd) != 0)
if (fd >= 0) {
debug_high("closed %s fd %d\n", fd_update_cb == NULL ?
"uncached" : "cached", fd);
if (rfd_close(fd) != 0)
debug("could not close fd %d", fd);
}
debug_high("get_psinfo ret %d, fd %d, %s\n", ((fd >= 0) ? 0 : -1), fd,
fd_update_cb != NULL ? "cached" : "uncached");
return ((fd >= 0) ? 0 : -1);
}
static int
list_walk_process_cb(lcollection_t *lcol, void *arg)
{
int (*cb)(lcollection_t *, lprocess_t *) =
(int(*)(lcollection_t *, lprocess_t *))arg;
lprocess_t *member;
lprocess_t *next;
member = lcol->lcol_lprocess;
while (member != NULL) {
pid_t pid = member->lpc_pid;
next = member->lpc_next;
debug_high("list_walk_all lpc %d\n", (int)pid);
if (cb(lcol, member) != 0) {
debug_high("list_walk_all aborted at lpc %d\n",
(int)pid);
return (1);
}
member = next;
}
return (0);
}
/*
* Unlink a process from its collection, updating relevant statistics, and
* freeing its associated memory.
*/
void
lprocess_free(lprocess_t *lpc)
{
pid_t pid;
lpc->lpc_collection->lcol_stat.lcols_proc_out++;
if (lpc->lpc_prev != NULL)
lpc->lpc_prev->lpc_next = lpc->lpc_next;
if (lpc->lpc_next != NULL)
lpc->lpc_next->lpc_prev = lpc->lpc_prev;
if (lpc->lpc_collection->lcol_lprocess == lpc)
lpc->lpc_collection->lcol_lprocess = (lpc->lpc_next !=
lpc ? lpc->lpc_next : NULL);
lpc->lpc_next = lpc->lpc_prev = NULL;
if (lpc->lpc_prpageheader != NULL)
free(lpc->lpc_prpageheader);
if (lpc->lpc_xmap != NULL)
free(lpc->lpc_xmap);
if (lpc->lpc_psinfo_fd >= 0) {
if (rfd_close(lpc->lpc_psinfo_fd) != 0)
debug("could not close %d lpc_psinfo_fd %d",
(int)lpc->lpc_pid, lpc->lpc_psinfo_fd);
lpc->lpc_psinfo_fd = -1;
}
if (lpc->lpc_pgdata_fd >= 0) {
if (rfd_close(lpc->lpc_pgdata_fd) != 0)
debug("could not close %d lpc_pgdata_fd %d",
(int)lpc->lpc_pid, lpc->lpc_pgdata_fd);
lpc->lpc_pgdata_fd = -1;
}
if (lpc->lpc_xmap_fd >= 0) {
if (rfd_close(lpc->lpc_xmap_fd) != 0)
debug("could not close %d lpc_xmap_fd %d",
(int)lpc->lpc_pid, lpc->lpc_xmap_fd);
lpc->lpc_xmap_fd = -1;
}
if (lpc->lpc_ignore != NULL)
lmapping_free(&lpc->lpc_ignore);
pid = lpc->lpc_pid;
free(lpc);
debug_high("process %d freed\n", (int)pid);
}
void ClientManager::manageTransferFromDestToClient(struct sockaddr_in *if_used) {
int n_recv = 0;
int n_tot_recv = 0;
int block_stat_recv = 0;
struct timeval time_st, time_en;
debug_high("[PID: %d] - BEGIN ClientManager::manageTransferFromDestToClient\n", getpid());
gettimeofday(&time_st, NULL);
debug_high("Receiving from server and sending to the client\n");
do {
memset(buffer, 0, sizeof(buffer));
//n_recv = recv(sockfd_VideoServer, buffer, sizeof(buffer), 0);
bool tryRead = true;
time_t start_t, end_t;
double diff_t;
time(&start_t);
while(tryRead) {
tryRead = false;
n_recv = recv(sockfd_VideoServer, buffer, sizeof(buffer), MSG_DONTWAIT);
if ((n_recv < 0) && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) {
usleep(100000);
time(&end_t);
diff_t = difftime(end_t, start_t);
//if (diff_t < InterfacesManager::getInstance().timer_update) {
if (diff_t < 8) {
tryRead = true;
}
}
}
if (n_recv > 0) {
int n_sent = send(new_sockfd_VideoClient, buffer, n_recv, 0);
if(n_sent < 0) {
perror("Error sending to client the server reply");
}
else if(n_sent == 0) {
debug_low("Connection closed by the client while sending back the message!?!?!\n");
}
else {
n_tot_recv += n_recv;
block_stat_recv += n_recv;
debug_high("\r%d of %d ", n_recv, n_tot_recv);
StatManager::getInstance().actual_stats.reply_ok = true;
if (block_stat_recv >= byte_update) {
gettimeofday(&time_en, NULL);
InterfacesManager::getInstance().updateInterfaceStats(if_used, block_stat_recv, timevaldiff_usec(&time_st, &time_en));
block_stat_recv = 0;
gettimeofday(&time_st, NULL);
}
}
}
else if (n_recv == 0) {
debug_high("connection closed by the server\n");
}
else {
perror("manageTransferFromDestToClient: Error receiving from server while forwarding");
}
} while (n_recv > 0);
StatManager::getInstance().actual_stats.frag_bytesize = n_tot_recv;
time(&StatManager::getInstance().actual_stats.end_request_time);
gettimeofday(&StatManager::getInstance().actual_stats.end_request_timeval, NULL);
debug_high("\n");
if (n_tot_recv == block_stat_recv) { // never made stats (packet size less then "byte_update")
gettimeofday(&time_en, NULL);
InterfacesManager::getInstance().updateInterfaceStats(if_used, block_stat_recv, timevaldiff_usec(&time_st, &time_en));
}
StatManager::getInstance().makeStat();
debug_high("[PID: %d] - END ClientManager::manageTransferFromDestToClient\n", getpid());
}
void ClientManager::manageTransferOnStatUpdate(struct sockaddr_in *if_used) {
int n_recv = 0;
int n_tot_recv = 0;
int block_stat_recv = 0;
struct timeval time_st, time_en;
gettimeofday(&time_st, NULL);
debug_high("Receiving from client ONLY for statistics\n");
do {
memset(buffer, 0, sizeof(buffer));
//n_recv = recv(sockfd_VideoServer, buffer, sizeof(buffer), 0);
bool tryRead = true;
time_t start_t, end_t;
double diff_t;
//debug_medium("[%d] ----- Start receiving the STATISTICAL packet\n", getpid());
time(&start_t);
while(tryRead) {
tryRead = false;
n_recv = recv(sockfd_VideoServer, buffer, sizeof(buffer), MSG_DONTWAIT);
//debug_medium("[%d] ----- Received %d byte for the the STATISTICAL packet\n", getpid(), n_recv);
if ((n_recv < 0) && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) {
usleep(100000);
time(&end_t);
diff_t = difftime(end_t, start_t);
double interval_update = InterfacesManager::getInstance().timer_update;
if (interval_update < 8) {
interval_update = 8;
}
if (diff_t < interval_update) {
tryRead = true;
}
//debug_medium("[%d] ----- Received %d byte for the the STATISTICAL packet\n", getpid(), n_recv);
}
}
if (n_recv > 0) {
n_tot_recv += n_recv;
block_stat_recv += n_recv;
if (block_stat_recv > byte_update) {
gettimeofday(&time_en, NULL);
InterfacesManager::getInstance().updateInterfaceStats(if_used, block_stat_recv, timevaldiff_usec(&time_st, &time_en));
block_stat_recv = 0;
gettimeofday(&time_st, NULL);
}
}
else if (n_recv == 0) {
//debug_high("connection closed by the server\n");
}
else {
perror("Error receiving from client while forwarding");
}
} while (n_recv > 0);
if (n_tot_recv == block_stat_recv) { // never made stats (packet size less then "byte_update")
gettimeofday(&time_en, NULL);
InterfacesManager::getInstance().updateInterfaceStats(if_used, block_stat_recv, timevaldiff_usec(&time_st, &time_en));
}
}
bool ClientManager::sendGETtoDest(struct sockaddr_in *if_to_bind, bool dummy_req) {
struct sockaddr_in host_addr;
struct sockaddr_in dummy_if_to_bind;
debug_high("[PID: %d] - BEGIN ClientManager::sendGETtoDest\n", getpid());
host_addr.sin_port = htons(rm.getServerPort());
host_addr.sin_family=AF_INET;
//host_addr.sin_addr.s_addr = rm.getServerAddr();
if (strcmp(inet_ntoa(host_addr.sin_addr), "0.0.0.0") == 0){
inet_aton("143.205.176.132", &(host_addr.sin_addr));
}
else {
host_addr.sin_addr.s_addr = rm.getServerAddr();
}
if (if_to_bind){
debug_high("Start sending the GET to the server using %s\n", inet_ntoa(if_to_bind->sin_addr));
}
else {
debug_high("[PID: %d] - DEBUG (making dummy address) ClientManager::sendGETtoDest\n", getpid());
dummy_if_to_bind.sin_family = AF_INET;
//if_to_use.sin_port=htons(0);
int portToUse = (rand()%1000) + 9000;
dummy_if_to_bind.sin_port = htons(portToUse);
dummy_if_to_bind.sin_addr.s_addr = INADDR_ANY;
if_to_bind = &dummy_if_to_bind;
}
sockfd_VideoServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sockfd_VideoServer < 0) {
perror("Error on creating socket for the server connection");
debug_high("[PID: %d] - END (false1) ClientManager::sendGETtoDest\n", getpid());
return false;
}
else {
int risBind = 0; // if I don't have to execute the bind '0' will be OK
debug_high("[PID: %d] - DEBUG (before bind) ClientManager::sendGETtoDest\n", getpid());
if (if_to_bind != NULL) {
debug_high("[PID: %d] - DEBUG (really binding %s:%d) ClientManager::sendGETtoDest\n", getpid(), inet_ntoa(if_to_bind->sin_addr), (int)(ntohs(if_to_bind->sin_port)));
risBind = bind (sockfd_VideoServer, (struct sockaddr *)if_to_bind, sizeof(struct sockaddr_in));
}
debug_high("[PID: %d] - DEBUG (after bind) ClientManager::sendGETtoDest\n", getpid());
if (risBind == 0) {
int x = fcntl(sockfd_VideoServer, F_GETFL,0); // Get socket flags
fcntl(sockfd_VideoServer, F_SETFL, sockfd_VideoServer | O_NONBLOCK); // Add non-blocking flag
int ris_conn;
bool tryRead = true;
time_t start_t, end_t;
double diff_t;
time(&start_t);
while(tryRead) {
tryRead = false;
ris_conn = connect(sockfd_VideoServer, (struct sockaddr*)&host_addr, sizeof(struct sockaddr));
if ((ris_conn < 0) && ((errno == ETIMEDOUT) || (errno == ENETUNREACH) || (errno == EINPROGRESS) || (errno == EALREADY))) {
usleep(200000);
time(&end_t);
diff_t = difftime(end_t, start_t);
if (diff_t < 5) {
tryRead = true;
}
}
}
//if (connect(sockfd_VideoServer, (struct sockaddr*)&host_addr, sizeof(struct sockaddr)) < 0) {à
if (ris_conn < 0) {
perror("Error in connecting to remote server");
debug_high("[PID: %d] - END (err connecting to %s:%d) ClientManager::sendGETtoDest\n", getpid(), inet_ntoa(host_addr.sin_addr), (int)(ntohs(host_addr.sin_port)));
return false;
}
else {
//debug_high("Sending the original req to the destination: \n******************************\n%s\n******************************\n",
// rm.getCopyOfGET());
debug_high("[PID: %d] - DEBUG (connected) ClientManager::sendGETtoDest\n", getpid());
int n_send;
if (dummy_req) n_send = send(sockfd_VideoServer, rm.getDummyGET(), strlen(rm.getDummyGET()), 0);
else n_send = send(sockfd_VideoServer, rm.getCopyOfGET(), strlen(rm.getCopyOfGET()), 0);
if (n_send < 0) {
perror("Error writing to server socket");
debug_high("[PID: %d] - END (false3) ClientManager::sendGETtoDest\n", getpid());
return false;
}
debug_high("[PID: %d] - DEBUG (sent %d bytes) ClientManager::sendGETtoDest\n", getpid(), n_send);
}
}
else {
perror("Error binding");
debug_high("[PID: %d] - END (false4) ClientManager::sendGETtoDest\n", getpid());
return false;
}
}
if ((if_to_bind) && (if_to_bind != &dummy_if_to_bind)) {
debug_high("End sending the GET to the server using %s\n", inet_ntoa(if_to_bind->sin_addr));
}
else {
debug_high("End sending the GET to the server\n");
}
//start STATS
time(&StatManager::getInstance().actual_stats.start_request_time);
gettimeofday(&(StatManager::getInstance().actual_stats.start_request_timeval), NULL);
debug_high("[PID: %d] - END (true) ClientManager::sendGETtoDest\n", getpid());
return true;
}
bool ClientManager::manageRequest(void) {
debug_high("[PID: %d] - BEGIN ClientManager::manageRequest\n", getpid());
if (!rm.isLoaded()) {
debug_high("[PID: %d] - END (false1) ClientManager::sendGETtoDest\n", getpid());
return false;
}
struct sockaddr_in if_to_use;
struct sockaddr_in *if_to_use_act = NULL; // pointer used to check later if the bind should be done or not
//choose the interface to use and, in some cases, update the unused interfaces
//if ((rm.isGET()) && (rm.isMPEGDASHreq())) {
if ((rm.isGET()) && (rm.isMPEGDASH_M4S())) {
std::list<struct sockaddr_in> if_to_update;
std::list<struct sockaddr_in>::iterator it_update;
InterfacesManager::getInstance().chooseIF(if_to_use, if_to_update);
if_to_use_act = &if_to_use;
StatManager::getInstance().actual_stats.isMS4 = true;
StatManager::getInstance().actual_stats.choosed_interface.s_addr = if_to_use.sin_addr.s_addr;
StatManager::getInstance().actual_stats.reply_ok = false;
StatManager::getInstance().fillFragmentField(rm.getPathName());
//before managing request check if some interfaces must be updated
for (it_update = if_to_update.begin(); it_update != if_to_update.end(); it_update++){
struct sockaddr_in *act_sock = &(*it_update);
forkAndUpdateStats(act_sock);
// updates are done by other processes
// only the parent process should exit from this function...
}
}
else {
//tratto in maniera trasparente questa connessione tcp
debug_medium("Managing transparently non MPEG-DASH M4S frame get (no stats update)\n");
StatManager::getInstance().actual_stats.isMS4 = false;
}
if (rm.isMPEGDASHreq() || (!discard_MPEGDASH)) {
// Sending the REQUEST to destination and managing the transfer
if (sendGETtoDest(if_to_use_act, false)) {
manageTransferFromDestToClient(if_to_use_act);
close (sockfd_VideoServer);
sockfd_VideoServer = -1;
}
else {
debug_low("Error sending request to the destination\n");
}
}
else {
debug_low("Discarding non MPEGH-DASH requests due to the '-x' parameter\n");
}
if ((rm.isGET()) && (rm.isMPEGDASH_M4S()) && (StatManager::getInstance().actual_stats.reply_ok == false) && (if_to_use_act != NULL)) {
InterfacesManager::getInstance().updateInterfaceStats(if_to_use_act, 1, 1000000);
}
debug_high("[PID: %d] - END (true) ClientManager::manageRequest\n", getpid());
return true;
}
bool ClientManager::getRequestFromClient(void) {
debug_high("[PID: %d] - BEGIN ClientManager::getRequestFromClient\n", getpid());
if (new_sockfd_VideoClient < 0) {
debug_high("[PID: %d] - END (false1) ClientManager::getRequestFromClient\n", getpid());
return false;
}
bzero(buffer, sizeof(buffer));
int nrcv = recv(new_sockfd_VideoClient, buffer, sizeof(buffer), 0);
if (nrcv < 0) {
perror("Error recv from client socket");
debug_high("[PID: %d] - END (false2) ClientManager::getRequestFromClient\n", getpid());
return false;
}
else if (nrcv == 0) {
debug_high("ClientManager::getRequestFromClient - Connection closed by client\n");
debug_high("[PID: %d] - END (false3) ClientManager::getRequestFromClient\n", getpid());
return false;
}
else {
// parsing the GET
debug_high("[PID: %d] - DEBUG (before load_req) ClientManager::getRequestFromClient\n", getpid());
if (!rm.load_req(buffer, nrcv)) {
// not a get and hence I have to get the destination address in another way
// fill at least host_name and server_port (if present)
// assume s is a connected socket
socklen_t len;
struct sockaddr_storage addr;
char ipstr[INET6_ADDRSTRLEN];
int port;
debug_high("[PID: %d] - DEBUG (false load_req) ClientManager::getRequestFromClient\n", getpid());
len = sizeof addr;
getpeername(new_sockfd_VideoClient, (struct sockaddr*)&addr, &len);
// deal with IPv4 only:
if (addr.ss_family == AF_INET) {
struct sockaddr_in *s = (struct sockaddr_in *)&addr;
port = ntohs(s->sin_port);
inet_ntop(AF_INET, &s->sin_addr, ipstr, sizeof ipstr);
printf("Peer IP address: %s\n", ipstr);
printf("Peer port : %d\n", port);
rm.setServerPort(port);
rm.setServerAddr(s->sin_addr.s_addr);
}
if (rm.isConnectReq()) {
debug_high("Replying to CONNECT request\n");
char *rep =
"HTTP/1.1 403 Forbidden\n"
"Date: Thu, 19 Feb 2009 12:27:04 GMT\n"
"Server: Apache/2.2.3\n"
"Last-Modified: Wed, 18 Jun 2003 16:05:58 GMT\n"
"ETag: \"56d-9989200-1132c580\"\n"
"Content-Type: text/html\n"
"Content-Length: 15\n"
"Accept-Ranges: bytes\n"
"Connection: close\n"
"\n"
"sdfkjsdnbfkjbsf";
//snprintf(rep, sizeof(rep), "");
int s = send (new_sockfd_VideoClient, rep, strlen(rep), 0);
debug_high("Succesfully sent %d bytes\n", s);
}
debug_high("[PID: %d] - END (false4) ClientManager::getRequestFromClient\n", getpid());
return false; //TODO non so come si fa... per ora prendo solo GET
// boh! non so come/dove leggere la destinazione
}
}
debug_high("[PID: %d] - END (true) ClientManager::getRequestFromClient\n", getpid());
return true;
}
