/*	common/iscsi_manage.c	vi: set autoindent tabstop=4 shiftwidth=4 :	This is the Management interface used to configure parameters	on the iSCSI initiator and iSCSI target implementations	Assumptions:	requires the initiator and target modules to be loaded before	the program is invoked.	(Uses the proc interface provided by the modules).*//*	Copyright (C) 2001-2003 InterOperability Lab (IOL)	University of New Hampshier (UNH)	Durham, NH 03824	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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,	USA.	The name of IOL and/or UNH may not be used to endorse or promote products	derived from this software without specific prior written permission.*/#define _POSIX_C_SOURCE 199506L#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <fcntl.h>#include <ctype.h>#include <string.h>#include <errno.h>#include <netdb.h>#include <arpa/inet.h>#include <asm/param.h>#include <asm/types.h>#include "iscsi_common.h"#include "debug.h"/*  strdup() not defined in POSIX */extern char *strdup(const char *);#define DEFAULT_HOST_NO		0#define DEFAULT_TARGET_NO	0char server_node[MAXHOSTNAMELEN];/*	configures the initiator and target login parameters	by writing the parameters to a /proc file */intdo_param(int who, int neg_info, char *keytext, int host_no, int target_no){	int fd, n, len = 0, result;	static char file_name[128];	static char text_line[1024];	TRACE(TRACE_DEBUG, "Entering do_param\n");	if (who == INITIATOR)		sprintf(file_name, "/proc/scsi/iscsi_initiator/%d", host_no);	else if (who == TARGET)		sprintf(file_name, "/proc/scsi_target/iscsi_target/%d", host_no);	result = -1;	if ((fd = open(file_name, O_RDWR)) < 0) {		perror(file_name);	} else {		if (who == INITIATOR)			len =				sprintf(text_line,						"iscsi_initiator manage %d %d %s",						target_no, neg_info, keytext);		else if (who == TARGET)			len = sprintf(text_line, "iscsi_target manage %d %s",						  neg_info, keytext);		if ((n = write(fd, text_line, len)) < 0)			perror(file_name);		else if (n != len && n != 0)			printf("%s: wrote %d bytes, expected %d\n", file_name, n, len);		else			result = 0;		close(fd);	}	TRACE(TRACE_DEBUG, "Leaving do_param\n");	return result;}/* number must follow offset in buffer */unsigned intcheck_number(char *buffer, int offset){	char *endptr;	unsigned int result;	errno = 0;	result = strtoul(&buffer[offset], &endptr, 0);	if (buffer[offset] == '\0' || errno != 0 ||		strspn(endptr, WHITE_SPACE) != strlen(endptr)) {		printf("illegal number \"%s\"\n", buffer);		exit(EXIT_FAILURE);	}	return result;}intmain(int argc, char *argv[]){	int neg_info, i, inittarget;	unsigned int value;	char *value_list = NULL;	int host_no, target_no;	char *endptr;	if (argc < 4) {						/* must have at least 4 parameters except when using "restore" */		if ((argc != 3) || strcmp(argv[2], "restore") != 0) {			printf				("Usage: iscsi_manage init/target set/setr/unset/setp/restore"				 "/force <ParameterName>=[value=val1[,val2,..]] [host=number]\n");			exit(EXIT_FAILURE);		}	}	if (strcmp(argv[1], "init") == 0)		inittarget = INITIATOR;	else if (strcmp(argv[1], "target") == 0)		inittarget = TARGET;	else {		printf			("parameter 1 must be \"init\" or \"target\", not \"%s\"\n",			 argv[1]);		exit(EXIT_FAILURE);	}	if (strcmp(argv[2], "set") == 0) {			/* negotiate a new value and accept whatever other side wants */		neg_info = KEY_TO_BE_NEGOTIATED;	} else if (strcmp(argv[2], "setr") == 0) {			/* negotiate a new value that MUST be used or we terminate the login */		neg_info = KEY_TO_BE_NEGOTIATED | KEY_BREAK_CONN_OR_RJT;	} else if (strcmp(argv[2], "unset") == 0) {			/* do nothing (i.e., keep default value and do not try to negotiate) */		neg_info = 0;	} else if (strcmp(argv[2], "restore") == 0) {			/* restore default values for all keys */		neg_info = RESTORE;	} else if (strcmp(argv[2], "setp") == 0) {			/* change value in table, but do not negotiate it */		neg_info = 0;	} else if (strcmp(argv[2], "force") == 0) {			/* force security phase or operational phase during login */		neg_info = FORCE;	}	/* Code added for handling snack - SAI */	else if (strcmp(argv[2], "snack") == 0) {			/* Configure snack parameters for Error Recovery */		neg_info = SNACK;	} else {		printf			("parameter 2 must be \"set\" or \"setr\" or \"unset\" or "			 "\"restore\" or \"force\", or \"snack\", not \"%s\"\n", argv[2]);		exit(EXIT_FAILURE);	}	/* Initialise */	host_no = DEFAULT_HOST_NO;	target_no = DEFAULT_TARGET_NO;	value_list = NULL;	/* this loop  is to get the host number from the arguments */	for (i = 3; i < argc; i++) {		if (strncmp(argv[i], "host=", 5) == 0) {				/* number of host adaptor */			errno = 0;			host_no = strtoul(&argv[i][5], &endptr, 0);			if (errno != 0 || strspn(endptr, WHITE_SPACE) != strlen(endptr)) {				printf("illegal host number \"%s\"\n", &argv[i][5]);				exit(EXIT_FAILURE);			}		}		if (strncmp(argv[i], "target=", 7) == 0) {				/* number of target within the host adaptor */			errno = 0;			target_no = strtoul(&argv[i][7], &endptr, 0);			if (errno != 0 || strspn(endptr, WHITE_SPACE) != strlen(endptr)) {				printf("illegal target number \"%s\"\n", &argv[i][7]);				exit(EXIT_FAILURE);			}		}	}	/* This loop is for actually setting the Key=Param values for the  */	/* initiator or target */	for (i = 3; i < argc; i++) {		char *buffer;		if (!(buffer = strdup(argv[i]))) {			printf("unable to allocate memory\n");			return -1;		}		if (strncmp(buffer, "host=", 5) == 0 || 							strncmp(buffer, "target=", 7) == 0) {									/* 								 * number of host adaptor 								 */		} else if (neg_info == FORCE) {			/* special case for forcing login phases and other features */			if (strncmp(buffer, "n=", 2) == 0) {					/* force sending of nops, number must follow */				check_number(buffer, 2);			} else if (strncmp(buffer, "v=", 2) == 0) {					/* force version number, number must follow */				value = check_number(buffer, 2);				if (value < DRAFT_MULTIPLIER)					value *= DRAFT_MULTIPLIER;				if (value != DRAFT20) {					printf("illegal draft version number \"%s\"\n", buffer);					exit(EXIT_FAILURE);				}				printf("ignoring draft version number \"%s\"\n", buffer);				/* in case value was multiplied by 100, set up new v= */				free(buffer);				if (!(buffer = malloc(16))) {					printf("unable to allocate memory\n");					return -1;				}				sprintf(buffer, "v=%u", value);			}			/* force r2t retransmit timer - SAI */			else if (strncmp(buffer, "r2tp=", 5) == 0) {				check_number(buffer, 5);			/* force the retransmit check interval and command 				retransmit period - SAI */			} else if (strncmp(buffer, "p=", 2) == 0) {				check_number(buffer, 2);			} else if (strncmp(buffer, "sch=", 4) == 0) {				check_number(buffer, 4);			} else if (strcmp(buffer, "s") != 0					   && strcmp(buffer, "o") != 0					   && strcmp(buffer, "f") != 0					   && strcmp(buffer, "r") != 0					   && strcmp(buffer, "xok") != 0					   && strcmp(buffer, "tk1") != 0					   /* chap and srp support - CHONG */					   && strcmp(buffer, "t") != 0					   && strcmp(buffer, "b") != 0					   && strncmp(buffer, "cl=", 3) != 0					   && strncmp(buffer, "px=", 3) != 0					   && strncmp(buffer, "pn=", 3) != 0					   && strncmp(buffer, "lx=", 3) != 0					   && strncmp(buffer, "ln=", 3) != 0					   && strncmp(buffer, "sg=", 3) != 0					   && strncmp(buffer, "sx=", 3) != 0					   && strncmp(buffer, "V=", 2) != 0 /* iscsi_trace */					   && strncmp(buffer, "isidt=", 6) != 0					   && strncmp(buffer, "isidn=", 6) != 0					   && strncmp(buffer, "isidq=", 6) != 0					   && strncmp(buffer, "sn=", 3) != 0) {				printf("illegal force parameter, \"%s\" not allowed\n", buffer);				exit(EXIT_FAILURE);			}			/* Configure the parameter */			do_param(inittarget, neg_info, buffer, host_no, target_no);		/* SNACK DATA and STATUS options - SAI */		} else if (neg_info == SNACK) {			if (strncmp(buffer, "a=", 2) == 0) {				if ((strcmp(buffer + 2, "y") != 0)					&& (strcmp(buffer + 2, "Y") != 0)					&& (strcmp(buffer + 2, "n") != 0)					&& (strcmp(buffer + 2, "N") != 0)) {					printf("Invalid value for datack snack - \"%s\"\n", buffer);					exit(EXIT_FAILURE);				}			} else if (strncmp(buffer, "d=", 2) == 0) {				if ((strcmp(buffer + 2, "y") != 0)					&& (strcmp(buffer + 2, "Y") != 0)					&& (strcmp(buffer + 2, "n") != 0)					&& (strcmp(buffer + 2, "N") != 0)) {					printf("Invalid value for data snack - \"%s\"\n", buffer);					exit(EXIT_FAILURE);				}			} else if (strncmp(buffer, "s=", 2) == 0) {				if ((strcmp(buffer + 2, "y") != 0)					&& (strcmp(buffer + 2, "Y") != 0)					&& (strcmp(buffer + 2, "n") != 0)					&& (strcmp(buffer + 2, "N") != 0)) {					printf("Invalid value for status snack - \"%s\"\n", buffer);					exit(EXIT_FAILURE);				}			} else if (strncmp(buffer, "h=", 2) == 0) {				check_number(buffer, 2);			} else {				printf("illegal snack parameter, \"%s\" not allowed\n", buffer);				exit(EXIT_FAILURE);			}			/* Configure the parameter */			do_param(inittarget, neg_info, buffer, host_no, target_no);		} else {			/* Configure the parameter */			do_param(inittarget, neg_info, buffer, host_no, target_no);		}		free(buffer);	}	if (neg_info == RESTORE) {		/* Configure the parameter */		do_param(inittarget, neg_info, "", host_no, target_no);	}	exit(EXIT_SUCCESS);}