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fis-gtm/sr_unix/secshr_client.c

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/****************************************************************
* *
* Copyright 2001, 2012 Fidelity Information Services, Inc *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include "gtm_stdlib.h" /* for exit() */
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/un.h>
#include <sys/sem.h>
#include "gtm_ctype.h"
#include <stddef.h>
#include <errno.h>
#include <signal.h>
#include "gtm_string.h"
#include "gtm_socket.h"
#include "gtm_fcntl.h"
#include "gtm_unistd.h"
#include "gtm_stdio.h"
#include "gtm_stat.h"
#include "gt_timer.h"
#include "io.h"
#include "gtmsecshr.h"
#include "iosp.h"
#include "error.h"
#include "eintr_wrappers.h"
#include "util.h"
#include "send_msg.h"
#include "gtmmsg.h"
#include "wcs_backoff.h"
#include "trans_log_name.h"
#include "gdsroot.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "filestruct.h"
#include "gtm_logicals.h"
#include "secshr_client.h"
GBLREF struct sockaddr_un gtmsecshr_sock_name;
GBLREF key_t gtmsecshr_key;
GBLREF int gtmsecshr_sockpath_len;
GBLREF int gtmsecshr_sockfd;
GBLREF mstr gtmsecshr_pathname;
GBLREF int server_start_tries;
GBLREF boolean_t gtmsecshr_sock_init_done;
GBLREF uint4 process_id;
GBLREF ipcs_mesg db_ipcs;
static int secshr_sem;
static int gtmsecshr_file_check_done = 0;
static mstr gtmsecshr_logname;
static char gtmsecshr_path[MAX_TRANS_NAME_LEN];
static volatile int client_timer_popped;
static unsigned long cur_seqno = 0;
const static char readonly secshr_fail_mesg_code[][MAX_GTMSECSHR_FAIL_MESG_LEN] = {
"",
"Wake Message Failed",
"Check process alive failed",
"Remove Semaphore failed",
"Remove Shared Memory segment failed",
"Ping Message failed",
"Remove File failed",
"Continue Process failed",
};
const static char readonly secshrstart_error_code[][MAX_GTMSECSHR_FAIL_MESG_LEN] = {
"",
"gtmsecshr unable to set-uid to root",
"gtmsecshr unable to set-gid to root",
"gtmsecshr unable to open log file",
"gtmsecshr unable to dup stdout and stderr",
"The environmental variable gtm_dist is pointing to an invalid path",
"Unable to exec gtmsecshr",
"gtmsecshr unable to create a child process",
"The environmental variable gtm_log is pointing to an invalid path",
"Error with gtmsecshr semaphore",
"Invalid gtm exit message",
"See syslog for cause of failure",
};
error_def(ERR_GTMSECSHR);
error_def(ERR_GTMSECSHRPERM);
error_def(ERR_GTMSECSHRSOCKET);
error_def(ERR_GTMSECSHRSRVF);
error_def(ERR_GTMSECSHRSRVFID);
error_def(ERR_GTMSECSHRSRVFIL);
error_def(ERR_GTMSECSHRSTART);
error_def(ERR_GTMSECSHRTMPPATH);
error_def(ERR_LOGTOOLONG);
error_def(ERR_SYSCALL);
error_def(ERR_TEXT);
#define MAX_RETRIES 7
#define CLIENT_ACK_TIMER 5
#define START_SERVER \
{ \
int arraysize, errorindex; \
\
if (0 != (create_server_status = create_server())) \
{ \
assert(ARRAYSIZE(secshrstart_error_code) == (SYSLOGHASERRORDETAIL + 1)); \
errorindex = create_server_status; \
if ((0 > errorindex) || (SYSLOGHASERRORDETAIL < errorindex)) \
errorindex = SYSLOGHASERRORDETAIL; \
assert(0 <= errorindex); \
assert(ARRAYSIZE(secshrstart_error_code) > errorindex); \
gtm_putmsg(VARLSTCNT(9) ERR_GTMSECSHRSTART, 3, RTS_ERROR_TEXT("Client"), \
process_id, ERR_TEXT, 2, \
RTS_ERROR_STRING(secshrstart_error_code[errorindex])); \
if (FATALFAILURE(create_server_status)) \
{ \
gtmsecshr_sock_cleanup(CLIENT); \
return create_server_status; \
} \
/* For transient failures we will continue after printing out message */ \
} \
hiber_start(3000); /* 3000 ms (3 sec) to allow server to come up */ \
}
#define SETUP_FOR_RECV \
{ \
recd = 0; \
mesg_len = 0; \
recv_ptr = (char *)&mesg; \
recv_len = SIZEOF(mesg); \
client_timer_popped = 0; \
msec_timeout = timeout2msec(CLIENT_ACK_TIMER); \
start_timer(timer_id, msec_timeout, client_timer_handler, 0, NULL); \
}
void client_timer_handler(void)
{
client_timer_popped = 1;
}
int send_mesg2gtmsecshr(unsigned int code, unsigned int id, char *path, int path_len)
{
int client_sockfd, create_server_status, fcntl_res;
int req_code, wait_count = 0;
int mesg_len;
int recv_len, send_len;
ssize_t recd = 0, sent, num_chars_recvd, num_chars_sent;
int save_errno, ret_code = 0, init_ret_code = 0;
int loop_count = 0;
boolean_t retry = FALSE, recv_complete, send_complete;
size_t server_proc_len;
int semop_res;
int selstat, status;
char *recv_ptr, *send_ptr;
struct sockaddr_un server_proc;
struct sembuf sop[4];
fd_set wait_on_fd;
gtmsecshr_mesg mesg;
TID timer_id;
int4 msec_timeout;
char *gtm_tmp_ptr;
timer_id = (TID)send_mesg2gtmsecshr;
if (!gtmsecshr_file_check_done)
{
struct stat stat_buf;
gtmsecshr_logname.addr = GTMSECSHR_PATH;
gtmsecshr_logname.len = SIZEOF(GTMSECSHR_PATH) - 1;
status = TRANS_LOG_NAME(&gtmsecshr_logname, &gtmsecshr_pathname, gtmsecshr_path, SIZEOF(gtmsecshr_path),
dont_sendmsg_on_log2long);
if (SS_NORMAL != status)
{
if (SS_LOG2LONG == status)
send_msg(VARLSTCNT(5) ERR_LOGTOOLONG, 3, gtmsecshr_logname.len, gtmsecshr_logname.addr,
SIZEOF(gtmsecshr_path) - 1);
send_msg(VARLSTCNT(9) ERR_GTMSECSHRSTART, 3, RTS_ERROR_TEXT("Client"), process_id,
ERR_TEXT, 2, RTS_ERROR_STRING(secshrstart_error_code[INVTRANSGTMSECSHR]));
rts_error(VARLSTCNT(9) ERR_GTMSECSHRSTART, 3, RTS_ERROR_TEXT("Client"), process_id,
ERR_TEXT, 2, RTS_ERROR_STRING(secshrstart_error_code[INVTRANSGTMSECSHR]));
}
gtmsecshr_pathname.addr[gtmsecshr_pathname.len] = '\0';
if (-1 == Stat(gtmsecshr_pathname.addr, &stat_buf))
rts_error(VARLSTCNT(8) ERR_SYSCALL, 5, LEN_AND_LIT("stat"), CALLFROM, errno);
if ((ROOTUID != stat_buf.st_uid) ||
!(stat_buf.st_mode & S_ISUID))
rts_error(VARLSTCNT(1) ERR_GTMSECSHRPERM);
gtmsecshr_file_check_done = 1;
}
if (!gtmsecshr_sock_init_done && ((init_ret_code = gtmsecshr_sock_init(CLIENT)) > 0))
return init_ret_code;
while (MAX_RETRIES > loop_count)
{ /* first, try the sendto */
req_code = mesg.code = code;
mesg.len = (int4)(GTM_MESG_HDR_SIZE);
if (REMOVE_FILE == code)
{
memcpy(mesg.mesg.path, path, path_len);
mesg.len += path_len;
} else if (FLUSH_DB_IPCS_INFO == code)
{
memcpy(&mesg.mesg.db_ipcs, &db_ipcs, SIZEOF(struct ipcs_mesg_struct));
/* most of the time file length is much smaller than MAX_TRANS_NAME_LEN */
mesg.len += (SIZEOF(struct ipcs_mesg_struct) - MAX_TRANS_NAME_LEN);
mesg.len += mesg.mesg.db_ipcs.fn_len;
} else
{
mesg.mesg.id = id;
mesg.len += SIZEOF(mesg.mesg.id);
}
mesg.pid = process_id;
mesg.seqno = ++cur_seqno;
sent = 0;
send_ptr = (char *)&mesg;
send_len = mesg_len = mesg.len;
for (send_complete = FALSE; !send_complete;)
{
SENDTO_SOCK(gtmsecshr_sockfd, send_ptr, send_len, 0, (struct sockaddr *)&gtmsecshr_sock_name,
(GTM_SOCKLEN_TYPE)gtmsecshr_sockpath_len, num_chars_sent);
if (0 <= num_chars_sent)
{
sent += num_chars_sent;
if (sent == mesg_len)
{
send_complete = TRUE;
break;
}
send_ptr += num_chars_sent;
send_len -= (int)num_chars_sent;
} else
{
/* sendto failed - start server and attempt to resend */
save_errno = errno;
if ((EISCONN == save_errno) || (EBADF == save_errno))
{
gtmsecshr_sock_cleanup(CLIENT);
gtmsecshr_sock_init(CLIENT);
wcs_backoff(loop_count + 1);
} else
{
# ifdef SECSHR_DEBUG
util_out_print("secshr_client starting server due to sendto failure errno = !UL",
TRUE, save_errno);
# endif
send_msg(VARLSTCNT(10) ERR_GTMSECSHRSRVF, 3, RTS_ERROR_TEXT("Client"), process_id,
ERR_TEXT, 2, RTS_ERROR_TEXT("sendto to gtmsecshr failed"), save_errno);
/* if gtm_tmp is not defined, show default path */
if (gtm_tmp_ptr = GETENV("gtm_tmp"))
send_msg(VARLSTCNT(8) ERR_GTMSECSHRTMPPATH, 2, RTS_ERROR_TEXT(gtm_tmp_ptr),
ERR_TEXT, 2, RTS_ERROR_TEXT("(from $gtm_tmp)"));
else
send_msg(VARLSTCNT(4) ERR_GTMSECSHRTMPPATH, 2, RTS_ERROR_TEXT("/tmp"));
START_SERVER;
}
loop_count++;
break;
}
}
if (!send_complete)
continue;
SETUP_FOR_RECV;
for (save_errno = 0, recv_complete = FALSE; !recv_complete;)
{
num_chars_recvd = recvfrom(gtmsecshr_sockfd, recv_ptr, MAX_MESG, 0, (struct sockaddr *)0,
(GTM_SOCKLEN_TYPE *)0);
if (0 <= num_chars_recvd)
{
recd += num_chars_recvd;
if ((0 == mesg_len) && (SIZEOF(int) <= recd))
mesg_len = mesg.len;
if (recd == mesg_len)
{
if (mesg.seqno == cur_seqno)
{
recv_complete = TRUE;
break;
}
else
{
cancel_timer(timer_id);
recv_complete = FALSE;
save_errno = 0;
SETUP_FOR_RECV;
continue;
}
}
recv_ptr += num_chars_recvd;
recv_len -= (int)num_chars_recvd;
continue;
}
if (client_timer_popped)
break;
if (EINTR == errno)
continue;
save_errno = errno;
if (EBADF == errno)
break;
send_msg(VARLSTCNT(10) ERR_GTMSECSHRSRVF, 3, RTS_ERROR_TEXT("Client"), process_id,
ERR_TEXT, 2, RTS_ERROR_TEXT("recvfrom from gtmsecshr failed"), save_errno);
if ((ECONNRESET == save_errno) || (ENOTCONN == save_errno))
{
num_chars_recvd = 0;
break;
}
gtmsecshr_sock_cleanup(CLIENT);
cancel_timer(timer_id);
return save_errno;
}
if ((client_timer_popped || (EBADF == save_errno)))
{
gtmsecshr_sock_cleanup(CLIENT);
gtmsecshr_sock_init(CLIENT);
retry = TRUE;
if (client_timer_popped)
{
# ifdef SECSHR_DEBUG
util_out_print("secshr_client starting server due to recvfrom timeout", TRUE);
# endif
START_SERVER;
}
loop_count++;
continue;
}
cancel_timer(timer_id);
if (ret_code = mesg.code) /* assign to ret_code, then test value */
{
switch(req_code)
{
case REMOVE_FILE :
if (retry && ENOENT == ret_code)
ret_code = 0; /* assume first time worked */
else
send_msg(VARLSTCNT(14) ERR_GTMSECSHRSRVFIL, 7, RTS_ERROR_TEXT("Client"),
process_id, mesg.pid, req_code, RTS_ERROR_TEXT(mesg.mesg.path),
ERR_TEXT, 2, RTS_ERROR_STRING(secshr_fail_mesg_code[req_code]),
mesg.code);
break;
case REMOVE_SEM:
case REMOVE_SHMMEM:
if (retry && (mesg.mesg.id == id))
ret_code = 0;
break;
case FLUSH_DB_IPCS_INFO:
break;
default :
if (EPERM != mesg.code && EACCES != mesg.code)
send_msg(VARLSTCNT(13) ERR_GTMSECSHRSRVFID, 6, RTS_ERROR_TEXT("Client"),
process_id, mesg.pid, req_code, mesg.mesg.id, ERR_TEXT, 2,
RTS_ERROR_STRING(secshr_fail_mesg_code[req_code]),
mesg.code);
break;
}
}
if (recv_complete)
break;
}
if (MAX_RETRIES == loop_count)
{
ret_code = -1;
gtm_putmsg(VARLSTCNT(9) ERR_GTMSECSHRSRVF, 3, RTS_ERROR_TEXT("Client"), process_id,
ERR_TEXT, 2, RTS_ERROR_TEXT("Unable to communicate with gtmsecshr"));
}
if (ONETIMESOCKET == init_ret_code)
gtmsecshr_sock_cleanup(CLIENT);
return ret_code;
}
int create_server(void)
{
int child_pid, done_pid, status = 0;
# ifdef _BSD
union wait chld_status;
# define CSTAT chld_status
# else
# define CSTAT status
# endif
int save_errno;
if (0 == (child_pid = fork())) /* BYPASSOK: we exec immediately, no FORK_CLEAN needed */
{
process_id = getpid();
/* do exec using gtmsecshr_path, which was initialize in file check code - send_mesg2gtmsecshr */
status = EXECL(gtmsecshr_path, gtmsecshr_path, 0);
if (-1 == status)
{
send_msg(VARLSTCNT(9) ERR_GTMSECSHRSTART, 3, RTS_ERROR_TEXT("Client"), process_id,
ERR_TEXT, 2, RTS_ERROR_STRING(secshrstart_error_code[INVTRANSGTMSECSHR]));
exit(UNABLETOEXECGTMSECSHR);
}
} else
{
if (-1 == child_pid)
{
status = GNDCHLDFORKFLD;
gtm_putmsg(VARLSTCNT(10) ERR_GTMSECSHRSTART, 3, RTS_ERROR_TEXT("Client"), process_id,
ERR_TEXT, 2, RTS_ERROR_TEXT("Failed to fork off gtmsecshr"), errno);
/* Sleep for a while and hope a subsequent fork will succeed */
hiber_start(1000);
}
for ( ; !status ; )
{
/* To prevent a warning message that the compiler issues */
done_pid = wait(&CSTAT);
if (done_pid == child_pid)
{
status = WEXITSTATUS(CSTAT);
break;
} else if (-1 == done_pid)
{
if (ECHILD == errno) /* Assume normal exit status */
break;
else if (EINTR != errno)
{
status = GNDCHLDFORKFLD;
gtm_putmsg(VARLSTCNT(10) ERR_GTMSECSHRSTART, 3, RTS_ERROR_TEXT("Client"), process_id,
ERR_TEXT, 2, RTS_ERROR_TEXT("Error spawning gtmsecshr"), errno);
}
}
}
}
return status;
}
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