/*
 * ** ZABBIX
 * ** Copyright (C) 2000-2005 SIA Zabbix
 * **
 * ** This program is free software; you can redistribute it and/or modify
 * ** it under the terms of the GNU General Public License as published by
 * ** the Free Software Foundation; either version 2 of the License, or
 * ** (at your option) any later version.
 * **
 * ** This program 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 General Public License for more details.
 * **
 * ** You should have received a copy of the GNU General Public License
 * ** along with this program; if not, write to the Free Software
 * ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * **/

#include "common.h"
#include "sysinfo.h"

#include <sys/sysctl.h>

#define DO_SUM 0
#define DO_MAX 1
#define DO_MIN 2
#define DO_AVG 3

#define ZBX_PROC_STAT_ALL 0
#define ZBX_PROC_STAT_RUN 1
#define ZBX_PROC_STAT_SLEEP 2
#define ZBX_PROC_STAT_ZOMB 3
	
#define ARGS_START_SIZE 64

static int	proc_argv(pid_t pid, char ***argv, size_t *argv_alloc, int *argc)
{
	size_t	sz;
	int	mib[4], ret;

	if (NULL == *argv) {
		*argv_alloc = ARGS_START_SIZE;
		*argv = zbx_malloc(*argv, *argv_alloc);
	}

	mib[0] = CTL_KERN;
	mib[1] = KERN_PROC_ARGS;
	mib[2] = (int)pid;
	mib[3] = KERN_PROC_ARGV;
retry:
	sz = *argv_alloc;
	if (0 != sysctl(mib, 4, *argv, &sz, NULL, 0)) {
		if (errno == ENOMEM) {
			*argv_alloc *= 2;
			*argv = zbx_realloc(*argv, *argv_alloc);
			goto retry;
		}
		return FAIL;
	}

	mib[3] = KERN_PROC_NARGV;

	sz = sizeof(int);
	if (0 != sysctl(mib, 4, argc, &sz, NULL, 0))
		return FAIL;

	return SUCCEED;
}

static void	collect_args(char **argv, int argc, char **args, size_t *args_alloc)
{
	int	i, args_offset, len;

	if (0 == *args_alloc) {
		*args_alloc = ARGS_START_SIZE;
		*args = zbx_malloc(*args, *args_alloc);
	}

	args_offset = 0;
	for (i = 0; i < argc; i ++ ) {
		len = (int)(strlen(argv[i]) + 2/* ' '+'\0' */);
		zbx_snprintf_alloc(args, (int *)args_alloc, &args_offset, len, "%s ", argv[i]);
	}

	if (0 != args_offset)
		args_offset--; /* ' ' */
	(*args)[args_offset] = '\0';
}

int     PROC_MEMORY(const char *cmd, const char *param, unsigned flags, AGENT_RESULT *result)
{
	char	procname[MAX_STRING_LEN],
		buffer[MAX_STRING_LEN],
		proccomm[MAX_STRING_LEN];
	int	do_task, pagesize, count, i,
		proc_ok, comm_ok,
		mib[4];

	double	value = 0.0,
		memsize = 0;
	int	proccount = 0;

	size_t	sz;

	struct kinfo_proc	*proc = NULL;
	struct passwd		*usrinfo;

	char	**argv = NULL, *args = NULL;
	size_t	argv_alloc = 0, args_alloc = 0;
	int	argc;

	assert(result);

	init_result(result);

	if (num_param(param) > 4)
		return SYSINFO_RET_FAIL;

	if (0 != get_param(param, 1, procname, sizeof(procname)))
		*procname = '\0';
	else if (strlen(procname) > MAXCOMLEN)
		procname[MAXCOMLEN] = '\0';

	if (0 != get_param(param, 2, buffer, sizeof(buffer)))
		*buffer = '\0';

	if (*buffer != '\0') {
		usrinfo = getpwnam(buffer);
		if (usrinfo == NULL)	/* incorrect user name */
			return SYSINFO_RET_FAIL;
	} else
		usrinfo = NULL;

	if (0 != get_param(param, 3, buffer, sizeof(buffer)))
		*buffer = '\0';

	if (*buffer != '\0') {
		if (0 == strcmp(buffer, "avg"))
			do_task = DO_AVG;
		else if (0 == strcmp(buffer, "max"))
			do_task = DO_MAX;
		else if (0 == strcmp(buffer, "min"))
			do_task = DO_MIN;
		else if (0 == strcmp(buffer, "sum"))
			do_task = DO_SUM;
		else
			return SYSINFO_RET_FAIL;
	} else
		do_task = DO_SUM;

	if (0 != get_param(param, 4, proccomm, sizeof(proccomm)))
		*proccomm = '\0';

	pagesize = getpagesize();

	mib[0] = CTL_KERN;
	mib[1] = KERN_PROC;
	if (NULL != usrinfo) {
		mib[2] = KERN_PROC_UID;
		mib[3] = usrinfo->pw_uid;
	} else {
		mib[2] = KERN_PROC_ALL;
		mib[3] = 0;
	}

	sz = 0;
	if (0 != sysctl(mib, 4, NULL, &sz, NULL, 0))
		return SYSINFO_RET_FAIL;

	proc = (struct kinfo_proc *)zbx_malloc(proc, sz);
	if (0 != sysctl(mib, 4, proc, &sz, NULL, 0)) {
		zbx_free(proc);
		return SYSINFO_RET_FAIL;
	}

	count = sz / sizeof(struct kinfo_proc);

	for (i = 0; i < count; i++) {
		proc_ok = 0;
		comm_ok = 0;

		if (*procname == '\0' || 0 == strcmp(procname, proc[i].kp_proc.p_comm))
			proc_ok = 1;

		if (*proccomm != '\0') {
			if (SUCCEED == proc_argv(proc[i].kp_proc.p_pid, &argv, &argv_alloc, &argc)) {
				collect_args(argv, argc, &args, &args_alloc);
				if (NULL != zbx_regexp_match(args, proccomm, NULL))
					comm_ok = 1;
			}
		} else
			comm_ok = 1;

		if (proc_ok && comm_ok) {
			value = proc[i].kp_eproc.e_vm.vm_tsize
				+ proc[i].kp_eproc.e_vm.vm_dsize
				+ proc[i].kp_eproc.e_vm.vm_ssize;
			value *= pagesize;

			if (0 == proccount++)
				memsize = value;
			else {
				if (do_task == DO_MAX)
					memsize = MAX(memsize, value);
				else if (do_task == DO_MIN)
					memsize = MIN(memsize, value);
				else
					memsize += value;
			}
		}
	}
	zbx_free(proc);
	zbx_free(argv);
	zbx_free(args);

	if (do_task == DO_AVG) {
		SET_DBL_RESULT(result, proccount == 0 ? 0 : memsize/proccount);
	} else {
		SET_UI64_RESULT(result, memsize);
	}

	return SYSINFO_RET_OK;
}

int	PROC_NUM(const char *cmd, const char *param, unsigned flags, AGENT_RESULT *result)
{
	char	procname[MAX_STRING_LEN],
		buffer[MAX_STRING_LEN],
		proccomm[MAX_STRING_LEN];
	int	zbx_proc_stat, count, i,
		proc_ok, stat_ok, comm_ok,
		mib[4];

	int	proccount = 0;

	size_t	sz;

	struct kinfo_proc	*proc = NULL;
	struct passwd		*usrinfo;

	char	**argv = NULL, *args = NULL;
	size_t	argv_alloc = 0, args_alloc = 0;
	int	argc;

	assert(result);

	init_result(result);

	if (num_param(param) > 4)
		return SYSINFO_RET_FAIL;

	if (0 != get_param(param, 1, procname, sizeof(procname)))
		*procname = '\0';
	else if (strlen(procname) > MAXCOMLEN)
		procname[MAXCOMLEN] = '\0';

	if (0 != get_param(param, 2, buffer, sizeof(buffer)))
		*buffer = '\0';

	if (*buffer != '\0') {
		usrinfo = getpwnam(buffer);
		if (usrinfo == NULL)	/* incorrect user name */
			return SYSINFO_RET_FAIL;
	} else
		usrinfo = NULL;
    
	if (0 != get_param(param, 3, buffer, sizeof(buffer)))
		*buffer = '\0';
		
	if (*buffer != '\0') {
		if (0 == strcmp(buffer, "run"))
			zbx_proc_stat = ZBX_PROC_STAT_RUN;
		else if (0 == strcmp(buffer, "sleep"))
			zbx_proc_stat = ZBX_PROC_STAT_SLEEP;
		else if (0 == strcmp(buffer, "zomb"))
			zbx_proc_stat = ZBX_PROC_STAT_ZOMB;
		else if (0 == strcmp(buffer, "all"))
			zbx_proc_stat = ZBX_PROC_STAT_ALL;
		else
			return SYSINFO_RET_FAIL;
	} else
		zbx_proc_stat = ZBX_PROC_STAT_ALL;

	if (0 != get_param(param, 4, proccomm, sizeof(proccomm)))
		*proccomm = '\0';

	mib[0] = CTL_KERN;
	mib[1] = KERN_PROC;
	if (NULL != usrinfo) {
		mib[2] = KERN_PROC_UID;
		mib[3] = usrinfo->pw_uid;
	} else {
		mib[2] = KERN_PROC_ALL;
		mib[3] = 0;
	}

	sz = 0;
	if (0 != sysctl(mib, 4, NULL, &sz, NULL, 0))
		return SYSINFO_RET_FAIL;

	proc = (struct kinfo_proc *)zbx_malloc(proc, sz);
	if (0 != sysctl(mib, 4, proc, &sz, NULL, 0)) {
		zbx_free(proc);
		return SYSINFO_RET_FAIL;
	}

	count = sz / sizeof(struct kinfo_proc);

	for (i = 0; i < count; i++) {
		proc_ok = 0;
		stat_ok = 0;
		comm_ok = 0;

		if (*procname == '\0' || 0 == strcmp(procname, proc[i].kp_proc.p_comm))
			proc_ok = 1;

		if (zbx_proc_stat != ZBX_PROC_STAT_ALL) {
			switch (zbx_proc_stat) {
			case ZBX_PROC_STAT_RUN:
				if (proc[i].kp_proc.p_stat == SRUN || proc[i].kp_proc.p_stat == SONPROC)
					stat_ok = 1;
				break;
			case ZBX_PROC_STAT_SLEEP:
				if (proc[i].kp_proc.p_stat == SSLEEP)
					stat_ok = 1;
				break;
			case ZBX_PROC_STAT_ZOMB:
				if (proc[i].kp_proc.p_stat == SZOMB || proc[i].kp_proc.p_stat == SDEAD)
					stat_ok = 1;
				break;
			}
		} else
			stat_ok = 1;

		if (*proccomm != '\0') {
			if (SUCCEED == proc_argv(proc[i].kp_proc.p_pid, &argv, &argv_alloc, &argc)) {
				collect_args(argv, argc, &args, &args_alloc);
				if (zbx_regexp_match(args, proccomm, NULL) != NULL)
					comm_ok = 1;
			}
		} else
			comm_ok = 1;
		
		if (proc_ok && stat_ok && comm_ok)
			proccount++;
	}
	zbx_free(proc);
	zbx_free(argv);
	zbx_free(args);

	SET_UI64_RESULT(result, proccount);

	return SYSINFO_RET_OK;
}