1820df7a2d
Host ATM Research Platform (HARP), Network Computing Services, Inc. This software was developed with the support of the Defense Advanced Research Projects Agency (DARPA).
529 lines
11 KiB
C
529 lines
11 KiB
C
/*
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*
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* ===================================
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* HARP | Host ATM Research Platform
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* ===================================
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*
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*
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* This Host ATM Research Platform ("HARP") file (the "Software") is
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* made available by Network Computing Services, Inc. ("NetworkCS")
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* "AS IS". NetworkCS does not provide maintenance, improvements or
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* support of any kind.
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*
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* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
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* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
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* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
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* In no event shall NetworkCS be responsible for any damages, including
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* but not limited to consequential damages, arising from or relating to
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* any use of the Software or related support.
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*
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* Copyright 1994-1998 Network Computing Services, Inc.
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*
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* Copies of this Software may be made, however, the above copyright
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* notice must be reproduced on all copies.
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*
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* @(#) $Id: scsp_config_lex.c,v 1.3 1998/08/13 20:11:14 johnc Exp $
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*
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*/
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/*
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* Server Cache Synchronization Protocol (SCSP) Support
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* ----------------------------------------------------
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*
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* Parse a configuration file into tokens
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*
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*/
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#ifndef lint
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static char *RCSid = "@(#) $Id: scsp_config_lex.c,v 1.3 1998/08/13 20:11:14 johnc Exp $";
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#endif
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#include <sys/types.h>
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#include <sys/param.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netatm/port.h>
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#include <netatm/queue.h>
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#include <netatm/atm.h>
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#include <netatm/atm_if.h>
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#include <netatm/atm_sap.h>
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#include <netatm/atm_sys.h>
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#include <netatm/atm_ioctl.h>
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#include <libatm.h>
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#include "scsp_msg.h"
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#include "scsp_if.h"
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#include "scsp_var.h"
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#include "scsp_config_parse.h"
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/*
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* Global variables
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*/
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int parse_line = 1;
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/*
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* Local definitions
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*/
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#define TOK_MAX_LEN 128
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/*
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* Character classes
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*/
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#define CHAR_INVALID 0 /* Not allowed */
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#define CHAR_ALPHA 1 /* G-W, Y, Z */
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#define CHAR_HEX_DIGIT 2 /* A-F */
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#define CHAR_X 3 /* X */
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#define CHAR_0 4 /* '0' */
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#define CHAR_DIGIT 5 /* 1-9 */
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#define CHAR_SPACE 6 /* space, tab */
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#define CHAR_DECIMAL 7 /* period */
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#define CHAR_SLASH 8 /* slash */
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#define CHAR_ASTERISK 9 /* asterisk */
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#define CHAR_HASH 10 /* pound sign */
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#define CHAR_SPECIAL 11 /* semicolon, braces */
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#define CHAR_MISC 12 /* chars allowd in file names */
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#define CHAR_EOL 13 /* new line */
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#define CHAR_EOF 14 /* EOF */
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#define CHAR_CNT CHAR_EOF + 1
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/*
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* Character class table (initialized by init_class_tbl())
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*/
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static char class_tbl[128];
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/*
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* State table element structure
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*/
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struct state_entry {
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int action;
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int next;
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};
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/*
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* Scanner states
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*/
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#define TS_INIT 0
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#define TS_ALPHA 1
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#define TS_INT_1 2
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#define TS_INT 3
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#define TS_HEX 4
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#define TS_SLASH_1 5
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#define TS_COMMENT 6
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#define TS_COMMENT_1 7
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#define TS_FLUSH 8
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#define TS_HEX_1 9
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#define TS_CNT TS_HEX_1 + 1
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/*
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* Token scanner state table
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*/
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static struct state_entry token_state_tbl[CHAR_CNT][TS_CNT] = {
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/* 0 1 2 3 4 5 6 7 8 9 */
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/* bad */{{2,0},{2,0},{2,0},{2,0},{2,0},{2,0},{0,6},{0,6},{0,8},{2,0}},
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/* g-z */{{1,1},{1,1},{1,1},{1,1},{2,0},{1,1},{0,6},{0,6},{0,8},{2,0}},
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/* a-f */{{1,1},{1,1},{1,1},{1,1},{1,9},{1,1},{0,6},{0,6},{0,8},{1,4}},
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/* x */{{1,1},{1,1},{1,4},{1,4},{2,0},{1,1},{0,6},{0,6},{0,8},{2,0}},
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/* 0 */{{1,2},{1,1},{1,3},{1,3},{1,9},{1,1},{0,6},{0,6},{0,8},{1,4}},
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/* 1-9 */{{1,3},{1,1},{1,3},{1,3},{1,9},{1,1},{0,6},{0,6},{0,8},{1,4}},
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/* sp */{{0,0},{6,0},{8,0},{8,0},{7,0},{6,0},{0,6},{0,6},{0,8},{2,0}},
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/* . */{{2,0},{1,1},{1,1},{1,1},{1,4},{1,1},{0,6},{0,6},{0,8},{2,0}},
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/* / */{{1,5},{1,1},{1,1},{1,1},{7,0},{4,8},{0,6},{0,0},{0,8},{2,0}},
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/* * */{{2,0},{6,0},{8,0},{8,0},{7,0},{4,6},{0,7},{0,7},{0,8},{2,0}},
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/* # */{{0,8},{6,0},{8,0},{8,0},{7,0},{6,0},{0,6},{0,6},{0,8},{2,0}},
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/* ;{} */{{3,0},{6,0},{8,0},{8,0},{7,0},{6,0},{0,6},{0,6},{0,8},{2,0}},
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/* Msc */{{2,0},{1,1},{1,1},{1,1},{2,0},{1,1},{0,6},{0,6},{0,8},{2,0}},
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/* EOL */{{0,0},{6,0},{8,0},{8,0},{7,0},{6,0},{0,6},{0,6},{0,0},{2,0}},
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/* EOF */{{9,0},{6,0},{8,0},{8,0},{7,0},{6,0},{2,0},{2,0},{9,0},{2,0}},
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};
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/*
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* Reserved words
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*/
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static struct {
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char *word;
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int token;
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} rsvd_word_tbl[] = {
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{ "ATMaddr", TOK_DCS_ADDR },
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{ "ATMARP", TOK_ATMARP },
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{ "CAReXmitInt", TOK_DCS_CA_REXMIT_INT },
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{ "CSUSReXmitInt", TOK_DCS_CSUS_REXMIT_INT },
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{ "CSUReXmitInt", TOK_DCS_CSU_REXMIT_INT },
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{ "CSUReXmitMax", TOK_DCS_CSU_REXMIT_MAX },
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{ "DCS", TOK_DCS },
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{ "DHCP", TOK_DHCP },
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{ "familyID", TOK_FAMILY },
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{ "file", TOK_LFN },
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{ "hops", TOK_DCS_HOP_CNT },
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{ "HelloDead", TOK_DCS_HELLO_DF },
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{ "HelloInt", TOK_DCS_HELLO_INT },
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{ "ID", TOK_DCS_ID },
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{ "LNNI", TOK_LNNI },
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{ "log", TOK_LOG },
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{ "MARS", TOK_MARS },
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{ "netif", TOK_NETIF },
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{ "NHRP", TOK_NHRP },
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{ "protocol", TOK_PROTOCOL },
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{ "server", TOK_SERVER },
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{ "ServerGroupID", TOK_SRVGRP },
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{ "syslog", TOK_SYSLOG },
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{ (char *)0, 0 },
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};
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/*
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* Copy a character string
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*
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* Make a copy of a character string, using strdup. If strdup fails,
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* meaning we're out of memory, then print an error message and exit.
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*
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* Arguments:
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* s string to be copied
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*
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* Returns:
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* char * pointer to area provided by strdup
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*
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*/
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static char *
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copy_buffer(s)
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char *s;
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{
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char *t;
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t = strdup(s);
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if (!t) {
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fprintf(stderr, "%s: strdup failed\n", prog);
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exit(1);
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}
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return(t);
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}
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/*
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* Push a character back onto the input stream.
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*
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* Arguments:
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* c character to be pushed
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*
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* Returns:
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* none
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*
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*/
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static void
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push_char(c)
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char c;
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{
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if (c == '\n')
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parse_line--;
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ungetc(c, cfg_file);
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}
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/*
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* Initialize the character class table.
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*
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* Set each entry in the character class table to the class
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* corresponding to the character.
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*
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* Arguments:
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* tbl pointer to table to be initialized
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*
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* Returns:
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* None
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*/
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static void
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init_class_tbl(tbl)
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char *tbl;
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{
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int i;
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char c;
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/*
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* Set up the table for all ASCII characters
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*/
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for (i=0; isascii((char)i); i++) {
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/*
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* Clear entry
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*/
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tbl[i] = CHAR_INVALID;
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/*
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* Set entries depending on character type
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*/
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c = (char)i;
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if (c == 'a' || c == 'b' || c == 'c' ||
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c == 'd' || c == 'e' || c == 'f' ||
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c == 'A' || c == 'B' || c == 'C' ||
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c == 'D' || c == 'E' || c == 'F')
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tbl[i] = CHAR_HEX_DIGIT;
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else if (c == 'x' || c == 'X')
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tbl[i] = CHAR_X;
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else if (isalpha(c))
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tbl[i] = CHAR_ALPHA;
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else if (c == '0')
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tbl[i] = CHAR_0;
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else if (isdigit(c))
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tbl[i] = CHAR_DIGIT;
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else if (c == '\n')
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tbl[i] = CHAR_EOL;
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else if (c == ' ' || c == '\t')
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tbl[i] = CHAR_SPACE;
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else if (c == '#')
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tbl[i] = CHAR_HASH;
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else if (c == '*')
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tbl[i] = CHAR_ASTERISK;
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else if (c == '.')
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tbl[i] = CHAR_DECIMAL;
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else if (c == '/')
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tbl[i] = CHAR_SLASH;
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else if (c == ';' || c == '{' || c == '}')
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tbl[i] = CHAR_SPECIAL;
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else if (c == '-' || c == '_' || c == '&' || c == '@' ||
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c == '~')
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tbl[i] = CHAR_MISC;
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}
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}
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/*
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* Get the class of a character.
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*
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* Arguments:
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* c character being scanned
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*
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* Returns:
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* int character class
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*/
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static int
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char_class(c)
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char c;
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{
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int class = CHAR_INVALID;
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if (c == EOF) {
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class = CHAR_EOF;
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} else if (c < 0 || !isascii(c)) {
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class = CHAR_INVALID;
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} else {
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class = class_tbl[c];
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}
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return(class);
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}
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/*
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* Print an error message when the scanner finds an error
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*
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* Arguments:
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* c character on which the error was recognized
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* state scanner state at error
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*
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* Returns:
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* None
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*/
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static void
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scan_error(c, state)
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char c;
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int state;
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{
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/*
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* Check for invalid character
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*/
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if (char_class(c) == CHAR_INVALID) {
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parse_error("Invalid character 0x%x encountered",
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c);
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return;
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}
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/*
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* Check for unexpected EOF
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*/
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if (char_class(c) == CHAR_EOF) {
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parse_error("Unexpected end of file");
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return;
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}
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/*
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* Error depends on state
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*/
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switch(state) {
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case TS_INIT:
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parse_error("Syntax error at '%c'", c);
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break;
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case TS_ALPHA:
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case TS_INT_1:
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case TS_INT:
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case TS_SLASH_1:
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case TS_COMMENT:
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case TS_COMMENT_1:
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case TS_FLUSH:
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parse_error("Syntax error");
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break;
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case TS_HEX:
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case TS_HEX_1:
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parse_error("Syntax error in hex string");
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break;
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}
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}
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/*
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* Assemble a token
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*
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* Read a character at a time from the input file, assembling the
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* characters into tokens as specified by the token scanner state
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* table. Return the completed token.
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*
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* Arguments:
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* None
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*
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* Returns:
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* token the type of the token found
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*/
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int
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yylex()
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{
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int i, state;
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char c, token_buffer[TOK_MAX_LEN];
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/*
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* Initialize
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*/
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if (class_tbl['A'] != CHAR_HEX_DIGIT)
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init_class_tbl(class_tbl);
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state = TS_INIT;
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UM_ZERO(token_buffer, sizeof(token_buffer));
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UM_ZERO(&yylval, sizeof(yylval));
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/*
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* Handle a character at a time until a token is built
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*/
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while(1) {
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/*
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* Read a character from the input file.
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*/
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c = (char)getc(cfg_file);
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if (c == '\n') {
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parse_line++;
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}
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#ifdef NOTDEF
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printf("token_state: state=%d, char=%c, class=%d, action=%d, next=%d\n",
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state,
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c,
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char_class(c),
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token_state_tbl[char_class][state].action,
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token_state_tbl[char_class][state].next);
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#endif
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/*
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* Perform an action based on the state table
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*/
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switch(token_state_tbl[char_class(c)][state].action) {
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case 0:
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/*
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* Ignore the character
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*/
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break;
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case 1:
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/*
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* Add character to buffer
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*/
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if (strlen(token_buffer) < TOK_MAX_LEN) {
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token_buffer[strlen(token_buffer)] = c;
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}
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break;
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case 2:
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/*
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* Error--print a message and start over
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*/
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scan_error(c, state);
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break;
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case 3:
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/*
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* Return special character
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*/
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return(c);
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break;
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case 4:
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/*
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* Clear the token buffer
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*/
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UM_ZERO(token_buffer, sizeof(token_buffer));
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break;
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case 5:
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/*
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* Not used
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*/
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break;
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case 6:
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/*
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* Return character token
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*/
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push_char(c);
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/*
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* Check for reserved words
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*/
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for (i=0; rsvd_word_tbl[i].word; i++) {
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if (strcasecmp(token_buffer,
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rsvd_word_tbl[i].word) == 0)
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break;
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}
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if (rsvd_word_tbl[i].word) {
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return(rsvd_word_tbl[i].token);
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}
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/*
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* Word isn't reserved, return alpha string
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*/
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yylval.tv_alpha = copy_buffer(token_buffer);
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return(TOK_NAME);
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break;
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case 7:
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/*
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* Return hex string (ATM address)
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*/
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push_char(c);
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yylval.tv_hex = copy_buffer(token_buffer);
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return(TOK_HEX);
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break;
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case 8:
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/*
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* Return integer
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*/
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push_char(c);
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yylval.tv_int = atoi(token_buffer);
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return(TOK_INTEGER);
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break;
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case 9:
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/*
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* Return EOF
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*/
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return(0);
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break;
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default:
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fprintf(stderr, "Invalid action indicator, state=%d, char=0x%02x\n",
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state, c);
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break;
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}
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/*
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* Set the next state and bump to the next character
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*/
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state = token_state_tbl[char_class(c)][state].next;
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}
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}
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