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/*
* Copyright (C) 2007, 2008 Stig Venaas <venaas@uninett.no>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <glob.h>
#include <sys/types.h>
#include <libgen.h>
#include <errno.h>
#include "debug.h"
#include "util.h"
#include "gconfig.h"
/* returns NULL on error, where to continue parsing if token and ok. E.g. "" will return token with empty string */
char *strtokenquote(char *s, char **token, char *del, char *quote, char *comment) {
char *t = s, *q, *r;
if (!t || !token || !del)
return NULL;
while (*t && strchr(del, *t))
t++;
if (!*t || (comment && strchr(comment, *t))) {
*token = NULL;
return t + 1; /* needs to be non-NULL, but value doesn't matter */
}
if (quote && (q = strchr(quote, *t))) {
t++;
r = t;
while (*t && *t != *q)
t++;
if (!*t || (t[1] && !strchr(del, t[1])))
return NULL;
*t = '\0';
*token = r;
return t + 1;
}
*token = t;
t++;
while (*t && !strchr(del, *t))
t++;
*t = '\0';
return t + 1;
}
int pushgconfdata(struct gconffile **cf, const char *data) {
int i;
struct gconffile *newcf;
if (!*cf) {
newcf = malloc(sizeof(struct gconffile) * 2);
if (!newcf)
return 0;
memset(newcf, 0, sizeof(struct gconffile) * 2);
} else {
for (i = 0; (*cf)[i].data || (*cf)[i].path; i++);
newcf = realloc(*cf, sizeof(struct gconffile) * (i + 2));
if (!newcf)
return 0;
memmove(newcf + 1, newcf, sizeof(struct gconffile) * (i + 1));
memset(newcf, 0, sizeof(struct gconffile));
}
newcf[0].data = data;
*cf = newcf;
return 1;
}
FILE *pushgconffile(struct gconffile **cf, const char *path) {
int i;
struct gconffile *newcf;
char *pathcopy;
FILE *f;
f = fopen(path, "r");
if (!f) {
debug(DBG_INFO, "could not read config file %s", path);
return NULL;
}
debug(DBG_DBG, "opened config file %s", path);
pathcopy = stringcopy(path, 0);
if (!pathcopy)
goto errmalloc;
if (!*cf) {
newcf = malloc(sizeof(struct gconffile) * 2);
if (!newcf)
goto errmalloc;
memset(newcf, 0, sizeof(struct gconffile) * 2);
} else {
for (i = 0; (*cf)[i].data || (*cf)[i].path; i++);
newcf = realloc(*cf, sizeof(struct gconffile) * (i + 2));
if (!newcf)
goto errmalloc;
memmove(newcf + 1, newcf, sizeof(struct gconffile) * (i + 1));
memset(newcf, 0, sizeof(struct gconffile));
}
newcf[0].file = f;
newcf[0].path = pathcopy;
*cf = newcf;
return f;
errmalloc:
free(pathcopy);
fclose(f);
debug(DBG_ERR, "malloc failed");
return NULL;
}
FILE *pushgconffiles(struct gconffile **cf, const char *cfgpath) {
int i;
FILE *f = NULL;
glob_t globbuf;
char *path, *curfile = NULL, *dir;
/* if cfgpath is relative, make it relative to current config */
if (*cfgpath == '/')
path = (char *)cfgpath;
else {
/* dirname may modify its argument */
curfile = stringcopy((*cf)->path, 0);
if (!curfile) {
debug(DBG_ERR, "malloc failed");
goto exit;
}
dir = dirname(curfile);
path = malloc(strlen(dir) + strlen(cfgpath) + 2);
if (!path) {
debug(DBG_ERR, "malloc failed");
goto exit;
}
strcpy(path, dir);
path[strlen(dir)] = '/';
strcpy(path + strlen(dir) + 1, cfgpath);
}
memset(&globbuf, 0, sizeof(glob_t));
if (glob(path, 0, NULL, &globbuf)) {
debug(DBG_INFO, "could not glob %s", path);
goto exit;
}
for (i = globbuf.gl_pathc - 1; i >= 0; i--) {
f = pushgconffile(cf, globbuf.gl_pathv[i]);
if (!f)
break;
}
globfree(&globbuf);
exit:
if (curfile) {
free(curfile);
free(path);
}
return f;
}
int popgconffile(struct gconffile **cf) {
int i;
if (!*cf)
return 0;
for (i = 0; (*cf)[i].data || (*cf)[i].path; i++);
if (i && (*cf)[0].file) {
fclose((*cf)[0].file);
if ((*cf)[0].path) {
debug(DBG_DBG, "closing config file %s", (*cf)[0].path);
free((*cf)[0].path);
}
}
if (i < 2) {
free(*cf);
*cf = NULL;
return 0;
}
memmove(*cf, *cf + 1, sizeof(struct gconffile) * i);
return 1;
}
void freegconf(struct gconffile **cf) {
int i;
if (!*cf)
return;
for (i = 0; (*cf)[i].data || (*cf)[i].path; i++) {
if ((*cf)[i].file) {
fclose((*cf)[i].file);
if ((*cf)[i].path) {
debug(DBG_DBG, "closing config file %s", (*cf)[i].path);
free((*cf)[i].path);
}
}
}
free(*cf);
*cf = NULL;
}
struct gconffile *openconfigfile(const char *file) {
struct gconffile *cf = NULL;
if (!pushgconffile(&cf, file)) {
debug(DBG_ERR, "could not read config file %s\n%s", file, strerror(errno));
return NULL;
}
debug(DBG_DBG, "reading config file %s", file);
return cf;
}
/* Parses config with following syntax:
* One of these:
* option-name value
* option-name = value
* Or:
* option-name value {
* option-name [=] value
* ...
* }
*/
int getlinefromcf(struct gconffile *cf, char *line, const size_t size) {
size_t i, pos;
if (!cf)
return 0;
if (cf->file)
return fgets(line, size, cf->file) ? 1 : 0;
else if (cf->data) {
pos = cf->datapos;
if (!cf->data[pos])
return 0;
for (i = pos; cf->data[i] && cf->data[i] != '\n'; i++);
if (cf->data[i] == '\n')
i++;
if (i - pos > size - 1)
i = size - 1 + pos;
memcpy(line, cf->data + pos, i - pos);
line[i - pos] = '\0';
cf->datapos = i;
return 1;
}
return 0;
}
int getconfigline(struct gconffile **cf, char *block, char **opt, char **val, int *conftype) {
char line[1024];
char *tokens[3], *s;
int tcount;
*opt = NULL;
*val = NULL;
*conftype = 0;
if (!cf || !*cf || (!(*cf)->file && !(*cf)->data))
return 1;
for (;;) {
if (!getlinefromcf(*cf, line, 1024)) {
if (popgconffile(cf))
continue;
return 1;
}
s = line;
for (tcount = 0; tcount < 3; tcount++) {
s = strtokenquote(s, &tokens[tcount], " \t\r\n", "\"'", tcount ? NULL : "#");
if (!s) {
debug(DBG_ERR, "Syntax error in line starting with: %s", line);
return 0;
}
if (!tokens[tcount])
break;
}
if (!tcount || **tokens == '#')
continue;
if (**tokens == '}') {
if (block)
return 1;
debug(DBG_ERR, "configuration error, found } with no matching {");
return 0;
}
break;
}
switch (tcount) {
case 2:
*opt = stringcopy(tokens[0], 0);
if (!*opt)
goto errmalloc;
*val = stringcopy(tokens[1], 0);
if (!*val)
goto errmalloc;
*conftype = CONF_STR;
break;
case 3:
if (tokens[1][0] == '=' && tokens[1][1] == '\0') {
*opt = stringcopy(tokens[0], 0);
if (!*opt)
goto errmalloc;
*val = stringcopy(tokens[2], 0);
if (!*val)
goto errmalloc;
*conftype = CONF_STR;
break;
}
if (tokens[2][0] == '{' && tokens[2][1] == '\0') {
*opt = stringcopy(tokens[0], 0);
if (!*opt)
goto errmalloc;
*val = stringcopy(tokens[1], 0);
if (!*val)
goto errmalloc;
*conftype = CONF_CBK;
break;
}
/* fall through */
default:
if (block)
debug(DBG_ERR, "configuration error in block %s, line starting with %s", block, tokens[0]);
else
debug(DBG_ERR, "configuration error, syntax error in line starting with %s", tokens[0]);
return 0;
}
if (**val)
return 1;
debug(DBG_ERR, "configuration error, option %s needs a non-empty value", *opt);
goto errexit;
errmalloc:
debug(DBG_ERR, "malloc failed");
errexit:
free(*opt);
*opt = NULL;
free(*val);
*val = NULL;
return 0;
}
/* returns 1 if ok, 0 on error */
/* caller must free returned values also on error */
int getgenericconfig(struct gconffile **cf, char *block, ...) {
va_list ap;
char *opt = NULL, *val, *word, *optval, **str = NULL, ***mstr = NULL, **newmstr;
uint8_t *bln;
int type = 0, conftype = 0, n;
void (*cbk)(struct gconffile **, void *, char *, char *, char *) = NULL;
void *cbkarg = NULL;
for (;;) {
free(opt);
if (!getconfigline(cf, block, &opt, &val, &conftype))
return 0;
if (!opt)
return 1;
if (conftype == CONF_STR && !strcasecmp(opt, "include")) {
if (!pushgconffiles(cf, val)) {
debug(DBG_ERR, "failed to include config file %s", val);
goto errexit;
}
free(val);
continue;
}
va_start(ap, block);
while ((word = va_arg(ap, char *))) {
type = va_arg(ap, int);
switch (type) {
case CONF_STR:
str = va_arg(ap, char **);
if (!str)
goto errparam;
break;
case CONF_MSTR:
mstr = va_arg(ap, char ***);
if (!mstr)
goto errparam;
break;
case CONF_BLN:
bln = va_arg(ap, uint8_t *);
if (!bln)
goto errparam;
break;
case CONF_CBK:
cbk = va_arg(ap, void (*)(struct gconffile **, void *, char *, char *, char *));
if (!cbk)
goto errparam;
cbkarg = va_arg(ap, void *);
break;
default:
goto errparam;
}
if (!strcasecmp(opt, word))
break;
}
va_end(ap);
if (!word) {
if (block)
debug(DBG_ERR, "configuration error in block %s, unknown option %s", block, opt);
debug(DBG_ERR, "configuration error, unknown option %s", opt);
goto errexit;
}
if (((type == CONF_STR || type == CONF_MSTR || type == CONF_BLN) && conftype != CONF_STR) ||
(type == CONF_CBK && conftype != CONF_CBK)) {
if (block)
debug(DBG_ERR, "configuration error in block %s, wrong syntax for option %s", block, opt);
debug(DBG_ERR, "configuration error, wrong syntax for option %s", opt);
goto errexit;
}
switch (type) {
case CONF_STR:
if (*str) {
debug(DBG_ERR, "configuration error, option %s already set to %s", opt, *str);
goto errexit;
}
*str = val;
break;
case CONF_MSTR:
if (*mstr)
for (n = 0; (*mstr)[n]; n++);
else
n = 0;
newmstr = realloc(*mstr, sizeof(char *) * (n + 2));
if (!newmstr) {
debug(DBG_ERR, "malloc failed");
goto errexit;
}
newmstr[n] = val;
newmstr[n + 1] = NULL;
*mstr = newmstr;
break;
case CONF_BLN:
if (!strcasecmp(val, "on"))
*bln = 1;
else if (!strcasecmp(val, "off"))
*bln = 0;
else {
if (block)
debug(DBG_ERR, "configuration error in block %s, value for option %s must be on or off, not %s", block, opt, val);
else
debug(DBG_ERR, "configuration error, value for option %s must be on or off, not %s", opt, val);
goto errexit;
}
break;
case CONF_CBK:
optval = malloc(strlen(opt) + strlen(val) + 2);
if (!optval) {
debug(DBG_ERR, "malloc failed");
goto errexit;
}
sprintf(optval, "%s %s", opt, val);
cbk(cf, cbkarg, optval, opt, val);
free(val);
free(optval);
continue;
default:
goto errparam;
}
if (block)
debug(DBG_DBG, "getgenericconfig: block %s: %s = %s", block, opt, val);
else
debug(DBG_DBG, "getgenericconfig: %s = %s", opt, val);
if (type == CONF_BLN)
free(val);
}
errparam:
debug(DBG_ERR, "getgenericconfig: internal parameter error");
errexit:
free(opt);
free(val);
return 0;
}
|