478 lines
12 KiB
C
478 lines
12 KiB
C
/**
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* @file config.c
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* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include "config.h"
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#include "ether.h"
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#include "print.h"
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enum config_section {
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GLOBAL_SECTION,
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PORT_SECTION,
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UNKNOWN_SECTION,
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};
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enum parser_result {
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PARSED_OK,
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NOT_PARSED,
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BAD_VALUE,
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};
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static enum parser_result parse_section_line(char *s, enum config_section *section)
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{
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if (!strcasecmp(s, "[global]")) {
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*section = GLOBAL_SECTION;
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} else if (s[0] == '[') {
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char c;
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*section = PORT_SECTION;
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/* Replace square brackets with white space. */
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while (0 != (c = *s)) {
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if (c == '[' || c == ']')
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*s = ' ';
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s++;
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}
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} else
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return NOT_PARSED;
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return PARSED_OK;
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}
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static enum parser_result parse_pod_setting(const char *option,
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const char *value,
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struct port_defaults *pod)
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{
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int val;
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Integer8 i8;
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UInteger8 u8;
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if (!strcmp(option, "logAnnounceInterval")) {
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if (1 != sscanf(value, "%hhd", &i8))
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return BAD_VALUE;
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pod->logAnnounceInterval = i8;
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} else if (!strcmp(option, "logSyncInterval")) {
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if (1 != sscanf(value, "%hhd", &i8))
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return BAD_VALUE;
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pod->logSyncInterval = i8;
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} else if (!strcmp(option, "logMinDelayReqInterval")) {
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if (1 != sscanf(value, "%hhd", &i8))
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return BAD_VALUE;
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pod->logMinDelayReqInterval = i8;
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} else if (!strcmp(option, "logMinPdelayReqInterval")) {
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if (1 != sscanf(value, "%hhd", &i8))
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return BAD_VALUE;
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pod->logMinPdelayReqInterval = i8;
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} else if (!strcmp(option, "announceReceiptTimeout")) {
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if (1 != sscanf(value, "%hhu", &u8))
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return BAD_VALUE;
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pod->announceReceiptTimeout = u8;
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} else if (!strcmp(option, "transportSpecific")) {
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if (1 != sscanf(value, "%hhx", &u8))
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return BAD_VALUE;
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pod->transportSpecific = u8 << 4;
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} else if (!strcmp(option, "path_trace_enabled")) {
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if (1 != sscanf(value, "%u", &val))
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return BAD_VALUE;
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pod->path_trace_enabled = val ? 1 : 0;
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} else if (!strcmp(option, "follow_up_info")) {
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if (1 != sscanf(value, "%u", &val))
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return BAD_VALUE;
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pod->follow_up_info = val ? 1 : 0;
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} else
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return NOT_PARSED;
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return PARSED_OK;
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}
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static enum parser_result parse_port_setting(const char *option,
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const char *value,
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struct config *cfg,
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int p)
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{
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enum parser_result r;
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r = parse_pod_setting(option, value, &cfg->iface[p].pod);
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if (r != NOT_PARSED)
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return r;
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if (!strcmp(option, "network_transport")) {
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if (!strcasecmp("L2", value))
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cfg->iface[p].transport = TRANS_IEEE_802_3;
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else if (!strcasecmp("UDPv4", value))
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cfg->iface[p].transport = TRANS_UDP_IPV4;
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else if (!strcasecmp("UDPv6", value))
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cfg->iface[p].transport = TRANS_UDP_IPV6;
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else
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return BAD_VALUE;
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} else if (!strcmp(option, "delay_mechanism")) {
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if (!strcasecmp("Auto", value))
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cfg->iface[p].dm = DM_AUTO;
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else if (!strcasecmp("E2E", value))
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cfg->iface[p].dm = DM_E2E;
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else if (!strcasecmp("P2P", value))
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cfg->iface[p].dm = DM_P2P;
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else
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return BAD_VALUE;
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} else
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return NOT_PARSED;
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return PARSED_OK;
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}
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static enum parser_result parse_global_setting(const char *option,
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const char *value,
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struct config *cfg)
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{
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double df;
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int i, val, cfg_ignore = cfg->cfg_ignore;
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UInteger16 u16;
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UInteger8 u8;
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unsigned char mac[MAC_LEN];
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struct defaultDS *dds = &cfg->dds;
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struct port_defaults *pod = &cfg->pod;
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enum parser_result r;
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r = parse_pod_setting(option, value, pod);
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if (r != NOT_PARSED)
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return r;
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if (!strcmp(option, "twoStepFlag")) {
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/* TODO - implement one step */
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if (1 != sscanf(value, "%d", &val) || !val)
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return BAD_VALUE;
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dds->twoStepFlag = val ? 1 : 0;
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} else if (!strcmp(option, "slaveOnly")) {
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if (1 != sscanf(value, "%d", &val))
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return BAD_VALUE;
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if (!(cfg_ignore & CFG_IGNORE_SLAVEONLY))
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dds->slaveOnly = val ? 1 : 0;
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} else if (!strcmp(option, "priority1")) {
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if (1 != sscanf(value, "%hhu", &u8))
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return BAD_VALUE;
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dds->priority1 = u8;
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} else if (!strcmp(option, "priority2")) {
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if (1 != sscanf(value, "%hhu", &u8))
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return BAD_VALUE;
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dds->priority2 = u8;
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} else if (!strcmp(option, "domainNumber")) {
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if (1 != sscanf(value, "%hhu", &u8) || !(u8 < 128))
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return BAD_VALUE;
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dds->domainNumber = u8;
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} else if (!strcmp(option, "clockClass")) {
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if (1 != sscanf(value, "%hhu", &u8))
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return BAD_VALUE;
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if (!(cfg_ignore & CFG_IGNORE_SLAVEONLY))
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dds->clockQuality.clockClass = u8;
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} else if (!strcmp(option, "clockAccuracy")) {
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if (1 != sscanf(value, "%hhx", &u8))
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return BAD_VALUE;
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dds->clockQuality.clockAccuracy = u8;
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} else if (!strcmp(option, "offsetScaledLogVariance")) {
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if (1 != sscanf(value, "%hx", &u16))
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return BAD_VALUE;
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dds->clockQuality.offsetScaledLogVariance = u16;
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} else if (!strcmp(option, "free_running")) {
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if (1 != sscanf(value, "%d", &val))
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return BAD_VALUE;
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dds->free_running = val ? 1 : 0;
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} else if (!strcmp(option, "freq_est_interval")) {
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if (1 != sscanf(value, "%d", &val) || !(val >= 0))
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return BAD_VALUE;
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dds->freq_est_interval = val;
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pod->freq_est_interval = val;
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} else if (!strcmp(option, "assume_two_step")) {
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if (1 != sscanf(value, "%u", &val))
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return BAD_VALUE;
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*cfg->assume_two_step = val ? 1 : 0;
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} else if (!strcmp(option, "tx_timestamp_retries")) {
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if (1 != sscanf(value, "%u", &val) || !(val > 0))
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return BAD_VALUE;
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*cfg->tx_timestamp_retries = val;
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} else if (!strcmp(option, "pi_proportional_const")) {
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if (1 != sscanf(value, "%lf", &df) || !(df >= 0.0 && df < 1.0))
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return BAD_VALUE;
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*cfg->pi_proportional_const = df;
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} else if (!strcmp(option, "pi_integral_const")) {
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if (1 != sscanf(value, "%lf", &df) || !(df >= 0.0 && df < 1.0))
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return BAD_VALUE;
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*cfg->pi_integral_const = df;
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} else if (!strcmp(option, "pi_offset_const")) {
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if (1 != sscanf(value, "%lf", &df) || !(df >= 0.0))
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return BAD_VALUE;
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*cfg->pi_offset_const = df;
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} else if (!strcmp(option, "ptp_dst_mac")) {
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if (MAC_LEN != sscanf(value, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
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&mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5]))
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return BAD_VALUE;
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for (i = 0; i < MAC_LEN; i++)
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cfg->ptp_dst_mac[i] = mac[i];
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} else if (!strcmp(option, "p2p_dst_mac")) {
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if (MAC_LEN != sscanf(value, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
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&mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5]))
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return BAD_VALUE;
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for (i = 0; i < MAC_LEN; i++)
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cfg->p2p_dst_mac[i] = mac[i];
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} else if (!strcmp(option, "udp6_scope")) {
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if (1 != sscanf(value, "%hhx", &u8) || (u8 & 0xF0))
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return BAD_VALUE;
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*cfg->udp6_scope = u8;
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} else if (!strcmp(option, "logging_level")) {
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if (1 != sscanf(value, "%d", &val) ||
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!(val >= PRINT_LEVEL_MIN && val <= PRINT_LEVEL_MAX))
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return BAD_VALUE;
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if (!(cfg_ignore & CFG_IGNORE_PRINT_LEVEL)) {
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cfg->print_level = val;
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}
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} else if (!strcmp(option, "verbose")) {
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if (1 != sscanf(value, "%d", &val))
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return BAD_VALUE;
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if (!(cfg_ignore & CFG_IGNORE_VERBOSE))
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cfg->verbose = val ? 1 : 0;
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} else if (!strcmp(option, "use_syslog")) {
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if (1 != sscanf(value, "%d", &val))
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return BAD_VALUE;
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if (!(cfg_ignore & CFG_IGNORE_USE_SYSLOG))
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cfg->use_syslog = val ? 1 : 0;
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} else if (!strcmp(option, "time_stamping")) {
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if (!(cfg_ignore & CFG_IGNORE_TIMESTAMPING)) {
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if (0 == strcasecmp("hardware", value))
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cfg->timestamping = TS_HARDWARE;
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else if (0 == strcasecmp("software", value))
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cfg->timestamping = TS_SOFTWARE;
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else if (0 == strcasecmp("legacy", value))
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cfg->timestamping = TS_LEGACY_HW;
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else
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return BAD_VALUE;
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}
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} else if (!strcmp(option, "delay_mechanism")) {
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if (!(cfg_ignore & CFG_IGNORE_DM)) {
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if (0 == strcasecmp("E2E", value))
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cfg->dm = DM_E2E;
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else if (0 == strcasecmp("P2P", value))
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cfg->dm = DM_P2P;
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else if (0 == strcasecmp("Auto", value))
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cfg->dm = DM_AUTO;
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else
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return BAD_VALUE;
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}
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} else if (!strcmp(option, "network_transport")) {
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if (!(cfg_ignore & CFG_IGNORE_TRANSPORT)) {
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if (!strcasecmp("UDPv4", value))
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cfg->transport = TRANS_UDP_IPV4;
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else if (!strcasecmp("UDPv6", value))
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cfg->transport = TRANS_UDP_IPV6;
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else if (!strcasecmp("L2", value))
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cfg->transport = TRANS_IEEE_802_3;
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else
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return BAD_VALUE;
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}
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} else if (!strcmp(option, "clock_servo")) {
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if (!strcasecmp("pi", value))
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cfg->clock_servo = CLOCK_SERVO_PI;
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else
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return BAD_VALUE;
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} else
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return NOT_PARSED;
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return PARSED_OK;
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}
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static enum parser_result parse_setting_line(char *line, char **option, char **value)
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{
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*option = line;
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while (!isspace(line[0])) {
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if (line[0] == '\0')
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return NOT_PARSED;
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line++;
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}
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while (isspace(line[0])) {
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line[0] = '\0';
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line++;
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}
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*value = line;
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return PARSED_OK;
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}
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int config_read(char *name, struct config *cfg)
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{
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enum config_section current_section = UNKNOWN_SECTION;
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enum parser_result parser_res;
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FILE *fp;
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char buf[1024], *line, *c, *option, *value;
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int current_port, line_num;
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fp = 0 == strncmp(name, "-", 2) ? stdin : fopen(name, "r");
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if (!fp) {
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fprintf(stderr, "failed to open configuration file %s: %m\n", name);
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return -1;
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}
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for (line_num = 1; fgets(buf, sizeof(buf), fp); line_num++) {
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c = buf;
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/* skip whitespace characters */
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while (isspace(*c))
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c++;
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/* ignore empty lines and comments */
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if (*c == '#' || *c == '\n' || *c == '\0')
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continue;
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line = c;
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/* remove trailing whitespace characters and \n */
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c += strlen(line) - 1;
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while (c > line && (*c == '\n' || isspace(*c)))
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*c-- = '\0';
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if (parse_section_line(line, ¤t_section) == PARSED_OK) {
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if (current_section == PORT_SECTION) {
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char port[17];
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if (1 != sscanf(line, " %16s", port)) {
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fprintf(stderr, "could not parse port name on line %d\n",
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line_num);
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goto parse_error;
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}
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current_port = config_create_interface(port, cfg);
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if (current_port < 0)
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goto parse_error;
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}
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continue;
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}
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switch (current_section) {
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case GLOBAL_SECTION:
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case PORT_SECTION:
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if (parse_setting_line(line, &option, &value)) {
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fprintf(stderr, "could not parse line %d in %s section\n",
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line_num,
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current_section == GLOBAL_SECTION ?
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"global" : cfg->iface[current_port].name);
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goto parse_error;
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}
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if (current_section == GLOBAL_SECTION)
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parser_res = parse_global_setting(option, value, cfg);
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else
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parser_res = parse_port_setting(option, value, cfg, current_port);
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switch (parser_res) {
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case PARSED_OK:
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break;
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case NOT_PARSED:
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fprintf(stderr, "unknown option %s at line %d in %s section\n",
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option, line_num,
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current_section == GLOBAL_SECTION ?
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"global" : cfg->iface[current_port].name);
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goto parse_error;
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case BAD_VALUE:
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fprintf(stderr, "%s is a bad value for option %s at line %d\n",
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value, option, line_num);
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goto parse_error;
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}
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break;
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case UNKNOWN_SECTION:
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fprintf(stderr, "line %d is not in a section\n", line_num);
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goto parse_error;
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default:
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continue;
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}
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}
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fclose(fp);
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return 0;
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parse_error:
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fprintf(stderr, "failed to parse configuration file %s\n", name);
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fclose(fp);
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return -2;
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}
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/* returns the number matching that interface, or -1 on failure */
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int config_create_interface(char *name, struct config *cfg)
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{
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struct interface *iface;
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int i;
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if (cfg->nports >= MAX_PORTS) {
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fprintf(stderr, "more than %d ports specified\n", MAX_PORTS);
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return -1;
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}
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iface = &cfg->iface[cfg->nports];
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/* only create each interface once (by name) */
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for(i = 0; i < cfg->nports; i++) {
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if (0 == strncmp(name, cfg->iface[i].name, MAX_IFNAME_SIZE))
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return i;
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}
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strncpy(iface->name, name, MAX_IFNAME_SIZE);
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iface->dm = cfg->dm;
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iface->transport = cfg->transport;
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memcpy(&iface->pod, &cfg->pod, sizeof(cfg->pod));
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sk_get_ts_info(name, &iface->ts_info);
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cfg->nports++;
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return i;
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}
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