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linuxptp/config.c

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/**
* @file config.c
* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <string.h>
#include "config.h"
#include "ether.h"
#include "print.h"
enum config_section {
GLOBAL_SECTION,
PORT_SECTION,
UNKNOWN_SECTION,
};
static int scan_mode(char *s, enum config_section *section)
{
if (0 == strcasecmp(s, "[global]\n")) {
*section = GLOBAL_SECTION;
return 1;
} else if (s[0] == '[') {
char c;
*section = PORT_SECTION;
/* Replace square brackets with white space. */
while (0 != (c = *s)) {
if (c == '[' || c == ']')
*s = ' ';
s++;
}
return 1;
} else {
return 0;
}
}
static int scan_pod(const char *s, struct port_defaults *pod)
{
int val;
Integer8 i8;
UInteger8 u8;
if (1 == sscanf(s, " logAnnounceInterval %hhd", &i8)) {
pod->logAnnounceInterval = i8;
return 1;
} else if (1 == sscanf(s, " logSyncInterval %hhd", &i8)) {
pod->logSyncInterval = i8;
return 1;
} else if (1 == sscanf(s, " logMinDelayReqInterval %hhd", &i8)) {
pod->logMinDelayReqInterval = i8;
return 1;
} else if (1 == sscanf(s, " logMinPdelayReqInterval %hhd", &i8)) {
pod->logMinPdelayReqInterval = i8;
return 1;
} else if (1 == sscanf(s, " announceReceiptTimeout %hhu", &u8)) {
pod->announceReceiptTimeout = u8;
return 1;
} else if (1 == sscanf(s, " transportSpecific %hhx", &u8)) {
pod->transportSpecific = u8 << 4;
return 1;
} else if (1 == sscanf(s, " path_trace_enabled %u", &val)) {
pod->path_trace_enabled = val ? 1 : 0;
return 1;
} else if (1 == sscanf(s, " follow_up_info %u", &val)) {
pod->follow_up_info = val ? 1 : 0;
return 1;
}
return 0;
}
static void scan_port_line(const char *s, struct config *cfg, int p)
{
char string[1024];
if (scan_pod(s, &cfg->iface[p].pod)) {
/* nothing to do here */
} else if (1 == sscanf(s, " network_transport %1023s", string)) {
if (0 == strcasecmp("L2", string))
cfg->iface[p].transport = TRANS_IEEE_802_3;
else if (0 == strcasecmp("UDPv4", string))
cfg->iface[p].transport = TRANS_UDP_IPV4;
else if (0 == strcasecmp("UDPv6", string))
cfg->iface[p].transport = TRANS_UDP_IPV6;
} else if (1 == sscanf(s, " delay_mechanism %1023s", string)) {
if (0 == strcasecmp("Auto", string))
cfg->iface[p].dm = DM_AUTO;
else if (0 == strcasecmp("E2E", string))
cfg->iface[p].dm = DM_E2E;
else if (0 == strcasecmp("P2P", string))
cfg->iface[p].dm = DM_P2P;
}
}
static void scan_global_line(const char *s, struct config *cfg)
{
double df;
int i, val, cfg_ignore = cfg->cfg_ignore;
UInteger16 u16;
UInteger8 u8;
unsigned char mac[MAC_LEN];
char string[1024];
struct defaultDS *dds = &cfg->dds;
struct port_defaults *pod = &cfg->pod;
if (scan_pod(s, pod)) {
/* nothing to do here */
} else if (1 == sscanf(s, " twoStepFlag %d", &val)) {
if (val) /* TODO - implement one step */
dds->twoStepFlag = val ? 1 : 0;
} else if (1 == sscanf(s, " slaveOnly %d", &val)) {
if (!(cfg_ignore & CFG_IGNORE_SLAVEONLY))
dds->slaveOnly = val ? 1 : 0;
} else if (1 == sscanf(s, " priority1 %hhu", &u8)) {
dds->priority1 = u8;
} else if (1 == sscanf(s, " priority2 %hhu", &u8)) {
dds->priority2 = u8;
} else if (1 == sscanf(s, " domainNumber %hhu", &u8)) {
if (u8 < 128)
dds->domainNumber = u8;
} else if (1 == sscanf(s, " clockClass %hhu", &u8)) {
if (!(cfg_ignore & CFG_IGNORE_SLAVEONLY))
dds->clockQuality.clockClass = u8;
} else if (1 == sscanf(s, " clockAccuracy %hhx", &u8)) {
dds->clockQuality.clockAccuracy = u8;
} else if (1 == sscanf(s, " offsetScaledLogVariance %hx", &u16)) {
dds->clockQuality.offsetScaledLogVariance = u16;
} else if (1 == sscanf(s, " free_running %d", &val)) {
dds->free_running = val ? 1 : 0;
} else if (1 == sscanf(s, " assume_two_step %u", &val)) {
*cfg->assume_two_step = val ? 1 : 0;
} else if (1 == sscanf(s, " tx_timestamp_retries %u", &val)) {
if (val > 0)
*cfg->tx_timestamp_retries = val;
} else if (1 == sscanf(s, " rx_timestamp_l2only %u", &val)) {
*cfg->rx_timestamp_l2only = val ? 1 : 0;
} else if (1 == sscanf(s, " pi_proportional_const %lf", &df)) {
if (df > 0.0 && df < 1.0)
*cfg->pi_proportional_const = df;
} else if (1 == sscanf(s, " pi_integral_const %lf", &df)) {
if (df > 0.0 && df < 1.0)
*cfg->pi_integral_const = df;
} else if (MAC_LEN == sscanf(s, " ptp_dst_mac %hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5])) {
for (i = 0; i < MAC_LEN; i++)
cfg->ptp_dst_mac[i] = mac[i];
} else if (MAC_LEN == sscanf(s, " p2p_dst_mac %hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&mac[0], &mac[1], &mac[2], &mac[3], &mac[4], &mac[5])) {
for (i = 0; i < MAC_LEN; i++)
cfg->p2p_dst_mac[i] = mac[i];
} else if (1 == sscanf(s, " logging_level %d", &val)) {
if (!(cfg_ignore & CFG_IGNORE_VERBOSE)) {
if (val >= PRINT_LEVEL_MIN && val <= PRINT_LEVEL_MAX)
cfg->print_level = val;
}
} else if (1 == sscanf(s, " verbose %d", &val)) {
if (!(cfg_ignore & CFG_IGNORE_VERBOSE))
cfg->verbose = val ? 1 : 0;
} else if (1 == sscanf(s, " use_syslog %d", &val)) {
if (!(cfg_ignore & CFG_IGNORE_USE_SYSLOG))
cfg->use_syslog = val ? 1 : 0;
} else if (1 == sscanf(s, " time_stamping %1023s", string)) {
if (!(cfg_ignore & CFG_IGNORE_TIMESTAMPING)) {
if (0 == strcasecmp("hardware", string))
cfg->timestamping = TS_HARDWARE;
else if (0 == strcasecmp("software", string))
cfg->timestamping = TS_SOFTWARE;
else if (0 == strcasecmp("legacy", string))
cfg->timestamping = TS_LEGACY_HW;
}
} else if (1 == sscanf(s, " delay_mechanism %1023s", string)) {
if (!(cfg_ignore & CFG_IGNORE_DM)) {
if (0 == strcasecmp("E2E", string))
cfg->dm = DM_E2E;
else if (0 == strcasecmp("P2P", string))
cfg->dm = DM_P2P;
else if (0 == strcasecmp("Auto", string))
cfg->dm = DM_AUTO;
}
} else if (1 == sscanf(s, " network_transport %1023s", string)) {
if (!(cfg_ignore & CFG_IGNORE_TRANSPORT)) {
if (0 == strcasecmp("UDPv4", string))
cfg->transport = TRANS_UDP_IPV4;
else if (0 == strcasecmp("UDPv6", string))
cfg->transport = TRANS_UDP_IPV6;
else if (0 == strcasecmp("L2", string))
cfg->transport = TRANS_IEEE_802_3;
}
}
}
int config_read(char *name, struct config *cfg)
{
enum config_section current_section = GLOBAL_SECTION;
FILE *fp;
char line[1024];
int current_port;
fp = 0 == strncmp(name, "-", 2) ? stdin : fopen(name, "r");
if (!fp) {
perror("fopen");
return -1;
}
while (fgets(line, sizeof(line), fp)) {
if (scan_mode(line, &current_section) ) {
if (current_section == PORT_SECTION) {
char port[17];
if (1 != sscanf(line, " %16s", port)) {
current_section = UNKNOWN_SECTION;
continue;
}
current_port = config_create_interface(port, cfg);
}
continue;
}
switch(current_section) {
case GLOBAL_SECTION:
scan_global_line(line, cfg);
break;
case PORT_SECTION:
scan_port_line(line, cfg, current_port);
break;
default:
continue;
}
}
fclose(fp);
return 0;
}
/* returns the number matching that interface, or -1 on failure */
int config_create_interface(char *name, struct config *cfg)
{
struct interface *iface;
int i;
if (cfg->nports >= MAX_PORTS) {
return -1;
}
iface = &cfg->iface[cfg->nports];
/* only create each interface once (by name) */
for(i = 0; i < cfg->nports; i++) {
if (0 == strncmp(name, cfg->iface[i].name, MAX_IFNAME_SIZE))
return i;
}
strncpy(iface->name, name, MAX_IFNAME_SIZE);
iface->dm = cfg->dm;
iface->transport = cfg->transport;
memcpy(&iface->pod, &cfg->pod, sizeof(cfg->pod));
cfg->nports++;
return i;
}
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