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serval-dna/conf.c

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/*
Serval Distributed Numbering Architecture (DNA)
Copyright (C) 2010-2012 Paul Gardner-Stephen
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 <ctype.h>
#include "conf.h"
#include "log.h"
/* This predicate function defines the constraints on configuration option names.
Valid:
foo
foo.bar
foo.bar.chow
_word
word1
word_1
Invalid:
foo.
.foo
1foo
foo.bar.
12
1.2.3
foo bar
@author Andrew Bettison <andrew@servalproject.com>
*/
int is_configvarname(const char *arg)
{
if (arg[0] == '\0')
return 0;
if (!(isalnum(arg[0]) || arg[0] == '_'))
return 0;
const char *s = arg + 1;
for (; *s; ++s)
if (!(isalnum(*s) || *s == '_' || (*s == '.' && s[-1] != '.')))
return 0;
return s[-1] != '.';
}
#define MAX_CONFIG_VARS (100)
#define CONFIG_BUFFER_ALLOCSIZE (1024)
static char *config_buffer = NULL;
static char *config_buffer_top = NULL;
static char *config_buffer_end = NULL;
static unsigned int confc = 0;
static char *confvar[MAX_CONFIG_VARS];
static char *confvalue[MAX_CONFIG_VARS];
static int reading = 0;
static char *grow_config_buffer(size_t needed)
{
size_t cursize = config_buffer_end - config_buffer;
size_t used = config_buffer_top - config_buffer;
size_t newsize = used + needed;
if (newsize > cursize) {
// Round up to nearest multiple of CONFIG_BUFFER_ALLOCSIZE.
newsize = newsize + CONFIG_BUFFER_ALLOCSIZE - ((newsize - 1) % CONFIG_BUFFER_ALLOCSIZE + 1);
char *newbuf = realloc(config_buffer, newsize);
if (newbuf == NULL) {
WHYF_perror("realloc(%llu)", newsize);
return NULL;
}
ssize_t dif = newbuf - config_buffer;
unsigned int i;
for (i = 0; i != confc; ++i) {
confvar[i] += dif;
confvalue[i] += dif;
}
config_buffer_end = newbuf + newsize;
config_buffer_top = newbuf + used;
config_buffer = newbuf;
}
char *ret = config_buffer_top;
config_buffer_top += needed;
return ret;
}
static int _read_config()
{
char conffile[1024];
if (!FORM_SERVAL_INSTANCE_PATH(conffile, "serval.conf"))
return -1;
size_t size = 0;
confc = 0;
FILE *f = fopen(conffile, "r");
if (f == NULL) {
if (errno != ENOENT)
return WHYF_perror("fopen(%s)", conffile);
} else {
if (fseeko(f, (off_t) 0, SEEK_END) == -1) {
WHYF_perror("fseeko(%s, 0, SEEK_END)", conffile);
fclose(f);
return -1;
}
off_t tell = ftello(f);
if (tell == -1) {
WHYF_perror("ftello(%s)", conffile);
fclose(f);
return -1;
}
size = tell;
if (fseeko(f, (off_t) 0, SEEK_SET) == -1) {
WHYF_perror("fseeko(%s, 0, SEEK_SET)", conffile);
fclose(f);
return -1;
}
if (grow_config_buffer(size) == NULL) {
fclose(f);
return -1;
}
if (fread(config_buffer, size, 1, f) != 1) {
if (ferror(f))
WHYF_perror("fread(%s, %llu)", conffile, (unsigned long long) size);
else
WHYF("fread(%s, %llu) hit EOF", conffile, (unsigned long long) size);
free(config_buffer);
config_buffer = NULL;
fclose(f);
return -1;
}
if (fclose(f) == EOF)
return WHYF_perror("fclose(%s)", conffile);
}
config_buffer_top = config_buffer_end = config_buffer + size;
char *c = config_buffer;
char *e = config_buffer_top;
unsigned int linenum;
char *problem = NULL;
char *extra = "";
for (linenum = 1; !problem && c < e; ++linenum) {
if (*c == '#') {
// skip comment lines
while (c < e && *c != '\n')
++c;
} else if (*c == '\n') {
// skip empty lines
++c;
} else if (c < e - 1 && *c == '\r' && c[1] == '\n') {
// skip empty lines
c += 2;
} else if (confc < MAX_CONFIG_VARS) {
char *var = confvar[confc] = c;
while (c < e && *c != '=' && *c != '\r' && *c != '\n')
++c;
if (c < e && *c == '=') {
*c++ = '\0';
if (is_configvarname(var)) {
confvalue[confc] = c;
while (c < e && *c != '\r' && *c != '\n')
++c;
if (c < e && *c == '\n') {
*c++ = '\0';
++confc;
} else if (c < e - 1 && *c == '\r' && c[1] == '\n') {
*c++ = '\0';
*c++ = '\0';
++confc;
} else {
problem = "missing end-of-line";
}
} else {
problem = "invalid variable name: ";
extra = var;
}
} else {
problem = "missing '='";
}
} else {
problem = "too many variables";
}
}
if (problem)
return WHYF("Error in %s at line %u: %s%s", conffile, linenum, problem, extra);
return 0;
}
/* Set a flag while reading config, to avoid infinite recursion between here and logging
that could be caused by any WHY() or WARN() or DEBUG() invoked in _read_config(). The
problem is that on the first log message, the logging system calls confValueGet() to
discover the path of the log file, and that will return here.
*/
static int read_config()
{
if (reading)
return -1;
reading = 1;
int ret = _read_config();
reading = 0;
return ret;
}
int confLocked()
{
return reading;
}
int confVarCount()
{
if (!config_buffer && read_config() == -1)
return -1;
return confc;
}
const char *confVar(unsigned int index)
{
if (!config_buffer && read_config() == -1)
return NULL;
if (index >= confc) {
WHYF("Config index=%u too big, confc=%u", index, confc);
return NULL;
}
return confvar[index];
}
const char *confValue(unsigned int index)
{
if (!config_buffer && read_config() == -1)
return NULL;
if (index >= confc) {
WHYF("Config index=%u too big, confc=%u", index, confc);
return NULL;
}
return confvalue[index];
}
const char *confValueGet(const char *var, const char *defaultValue)
{
if (var == NULL) {
WHYF("NULL var name, returning default value: %s", defaultValue ? defaultValue : "NULL");
return defaultValue;
}
if (!config_buffer && read_config() == -1) {
if (defaultValue)
WARNF("Config option %s: using default value: %s", var, defaultValue);
return defaultValue;
}
unsigned int i;
for (i = 0; i != confc; ++i)
if (strcasecmp(confvar[i], var) == 0)
return confvalue[i];
return defaultValue;
}
int confValueGetBoolean(const char *var, int defaultValue)
{
const char *value = confValueGet(var, NULL);
if (!value)
return defaultValue;
int flag = confParseBoolean(value, var);
if (flag >= 0)
return flag;
WARNF("Config option %s: using default value %s", var, defaultValue ? "true" : "false");
return defaultValue;
}
int64_t confValueGetInt64(const char *var, int64_t defaultValue)
{
const char *start = confValueGet(var, NULL);
if (!start)
return defaultValue;
const char *end = start;
long long value = strtoll(start, (char **)&end, 10);
if (*start && !*end && end != start)
return value;
WARNF("Config option %s: '%s' is not an integer, using default value %lld", var, start, (long long) defaultValue);
return defaultValue;
}
int64_t confValueGetInt64Range(const char *var, int64_t defaultValue, int64_t rangemin, int64_t rangemax)
{
int64_t value = confValueGetInt64(var, defaultValue);
if (value >= rangemin || value <= rangemax)
return value;
WARNF("Config option %s: configured value %lld out of range [%lld,%lld], using default value %lld",
var, (long long) value, (long long) rangemin, (long long) rangemax, (long long) defaultValue);
return defaultValue;
}
void confSetDebugFlags()
{
if (config_buffer || read_config() != -1) {
unsigned int setmask = 0;
unsigned int clearmask = 0;
int setall = 0;
int clearall = 0;
unsigned int i;
for (i = 0; i != confc; ++i) {
char *var = confvar[i];
if (strncasecmp(var, "debug.", 6) == 0) {
unsigned int mask = debugFlagMask(var + 6);
if (mask == 0)
WARNF("Unsupported debug option '%s'", var);
else {
int flag = confParseBoolean(confvalue[i], var);
if (flag != -1) {
if (mask == DEBUG_ALL) {
if (flag) {
//DEBUGF("Set all debug flags");
setall = 1;
} else {
//DEBUGF("Clear all debug flags");
clearall = 1;
}
} else {
if (flag) {
//DEBUGF("Set %s", var);
setmask |= mask;
} else {
//DEBUGF("Clear %s", var);
clearmask |= mask;
}
}
}
}
}
}
if (setall)
debug = DEBUG_ALL;
else if (clearall)
debug = 0;
debug &= ~clearmask;
debug |= setmask;
}
}
int confParseBoolean(const char *text, const char *option_name)
{
if (!strcasecmp(text, "on") || !strcasecmp(text, "yes") || !strcasecmp(text, "true") || !strcmp(text, "1"))
return 1;
if (!strcasecmp(text, "off") || !strcasecmp(text, "no") || !strcasecmp(text, "false") || !strcmp(text, "0"))
return 0;
WARNF("Config option %s: invalid boolean value '%s'", option_name, text);
return -1;
}
int confValueSet(const char *var, const char *value)
{
if (!config_buffer && read_config() == -1)
return -1;
if (!is_configvarname(var))
return WHYF("Cannot %s %s: invalid variable name", value ? "set" : "delete", var);
if (value == NULL) {
unsigned int i;
for (i = 0; i < confc; ++i) {
if (strcasecmp(var, confvar[i]) == 0) {
--confc;
for (; i < confc; ++i) {
confvar[i] = confvar[i + 1];
confvalue[i] = confvalue[i + 1];
}
return 0;
}
}
} else {
if (confc >= MAX_CONFIG_VARS)
return WHYF("Cannot set %s: too many variables", var);
size_t valuelen = strlen(value);
unsigned int i;
for (i = 0; i != confc; ++i) {
if (strcasecmp(var, confvar[i]) == 0) {
char *valueptr = confvalue[i];
if (valuelen > strlen(valueptr)) {
if ((valueptr = grow_config_buffer(valuelen + 1)) == NULL)
return -1;
}
strcpy(confvar[i], var);
confvalue[i] = strcpy(valueptr, value);
return 0;
}
}
size_t varlen = strlen(var);
char *buf = grow_config_buffer(varlen + 1 + valuelen + 1);
if (buf == NULL)
return -1;
confvar[confc] = strcpy(buf, var);
confvalue[confc] = strcpy(buf + varlen + 1, value);
++confc;
}
return 0;
}
int confWrite()
{
if (config_buffer) {
char conffile[1024];
char tempfile[1024];
FILE *outf = NULL;
if (!FORM_SERVAL_INSTANCE_PATH(conffile, "serval.conf"))
return -1;
if (!FORM_SERVAL_INSTANCE_PATH(tempfile, "serval.conf.temp"))
return -1;
if ((outf = fopen(tempfile, "w")) == NULL)
return WHYF_perror("fopen(%s, \"w\")", tempfile);
unsigned int i;
for (i = 0; i != confc; ++i)
fprintf(outf, "%s=%s\n", confvar[i], confvalue[i]);
if (fclose(outf) == EOF)
return WHYF_perror("fclose(%s)", tempfile);
if (rename(tempfile, conffile)) {
WHYF_perror("rename(%s, %s)", tempfile, conffile);
unlink(tempfile);
return -1;
}
}
return 0;
}
static char *thisinstancepath = NULL;
const char *serval_instancepath()
{
if (thisinstancepath)
return thisinstancepath;
const char *instancepath = getenv("SERVALINSTANCE_PATH");
if (!instancepath)
instancepath = DEFAULT_INSTANCE_PATH;
return instancepath;
}
void serval_setinstancepath(const char *instancepath)
{
if (thisinstancepath == NULL)
free(thisinstancepath);
thisinstancepath = strdup(instancepath);
}
int form_serval_instance_path(char *buf, size_t bufsiz, const char *path)
{
if (snprintf(buf, bufsiz, "%s/%s", serval_instancepath(), path) < bufsiz)
return 1;
WHYF("Cannot form pathname \"%s/%s\" -- buffer too small (%lu bytes)", serval_instancepath(), path, (unsigned long)bufsiz);
return 0;
}
int create_serval_instance_dir() {
return mkdirs(serval_instancepath(), 0700);
}
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