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yamlconf.c
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yamlconf.c
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/*
* ser2net - A program for allowing telnet connection to serial ports
* Copyright (C) 2001-2020 Corey Minyard <minyard@acm.org>
*
* SPDX-License-Identifier: GPL-2.0-only
*
* In addition, as a special exception, the copyright holders of
* ser2net give you permission to combine ser2net with free software
* programs or libraries that are released under the GNU LGPL and
* with code included in the standard release of OpenSSL under the
* OpenSSL license (or modified versions of such code, with unchanged
* license). You may copy and distribute such a system following the
* terms of the GNU GPL for ser2net and the licenses of the other code
* concerned, provided that you include the source code of that
* other code when and as the GNU GPL requires distribution of source
* code.
*
* Note that people who make modified versions of ser2net are not
* obligated to grant this special exception for their modified
* versions; it is their choice whether to do so. The GNU General
* Public License gives permission to release a modified version
* without this exception; this exception also makes it possible to
* release a modified version which carries forward this exception.
*/
#include <stdio.h>
#include <stddef.h>
#include <stdarg.h>
#include <stdbool.h>
#include <yaml.h>
#if defined(HAVE_WORDEXP) && defined(HAVE_WORDEXP_H)
#define DO_WORDEXP
#endif
#ifdef DO_WORDEXP
#include <wordexp.h>
#endif
#include <gensio/gensio.h>
#include <gensio/argvutils.h>
#include "ser2net.h"
#include "dataxfer.h"
#include "readconfig.h"
#include "led.h"
#include "fileio.h"
//#define DEBUG 1//
#ifdef WIN32
char *strndup(const char *s, size_t n)
{
int len = strlen(s);
char *r;
if (len > n)
len = n;
r = malloc(len + 1);
if (!r)
return NULL;
memcpy(r, s, len);
r[len] = '\0';
return r;
}
#endif
/*
* States for the state machine reading the configuration file.
*/
enum ystate {
PARSE_ERR,
BEGIN_DOC,
/*
* The main level consists of mappings.
*/
MAIN_LEVEL,
IN_INCLUDE,
IN_DEFINES,
IN_DEFINES_MAP,
IN_DEFINES_VAL,
IN_DELDEFAULTS,
IN_DELDEFAULTS_MAP,
IN_DELDEFAULTS_SEQ,
IN_DELDEFAULTS_VAL,
IN_DEFAULTS,
IN_DEFAULTS_MAP,
IN_DEFAULTS_INST,
IN_ADMINS,
IN_ADMINS_MAP,
IN_ADMINS_INST,
IN_LEDS,
IN_LEDS_MAP,
IN_LEDS_INST,
IN_CONNECTIONS,
IN_CONNECTIONS_MAP,
IN_CONNECTIONS_INST,
IN_ROTATORS,
IN_ROTATORS_MAP,
IN_ROTATORS_INST,
IN_DEFINE,
/*
* We have read the type of the main mapping (connection, led, etc)
* now waiting for a mapping start.
*/
IN_MAIN_NAME,
/*
* We are in the mapping of a "normal" main mapping, it will contain
* things like name, accepter, etc. in key-value pairs.
*/
IN_MAIN_MAP,
/*
* Got the key-value name, waiting for the value.
*/
IN_MAIN_MAP_KEYVAL,
/*
* Got an "options" key, these consists of another mapping holding
* the options.
*/
IN_OPTIONS,
IN_OPTIONS_MAP,
IN_OPTIONS_NAME,
/*
* Special handling for an integer timeout.
*/
IN_CONNSPEC_TIMEOUT,
/*
* Special handling for an enable bool.
*/
IN_CONNSPEC_ENABLE,
/*
* Rotators have a sequence of connections.
*/
IN_ROTATOR_CONNECTIONS,
IN_ROTATOR_CONNECTIONS_SEQ,
/*
* Shouldn't see anything after this.
*/
END_DOC
};
struct alias {
char *name;
char *value;
unsigned int namelen;
struct alias *next;
};
struct yfile {
char *name;
char *value;
unsigned int namelen;
struct yfile *next;
};
struct scalar_next_state;
struct option_info {
char *name;
enum ystate option_next_state;
};
struct keyval_info {
char *name;
unsigned int keyval_offset;
int keyval_type;
};
struct map_info {
char *name;
struct scalar_next_state *states;
int map_type;
bool needs_anchor;
bool wants_anchor;
};
enum which_info {
WHICH_INFO_NONE = 0,
WHICH_INFO_OPTION,
WHICH_INFO_KEYVAL,
WHICH_INFO_MAP
};
struct scalar_next_state {
char *name;
enum ystate next_state;
enum which_info infotype;
union {
struct option_info *option_info;
struct keyval_info *keyval_info;
struct map_info *map_info;
};
int version;
};
/*
* Used for processing include directives, stores the glob output and
* information about the previous file so we can go back.
*/
struct yaml_read_file {
#ifdef DO_WORDEXP
wordexp_t files;
bool files_set;
int curr_file;
#endif
bool closeme;
yaml_parser_t parser;
yaml_event_t e;
char *filename;
ftype *ft;
struct yaml_read_file *prev_f;
};
struct yaml_read_handler_data {
struct yaml_read_file *f;
char **config_lines;
unsigned int num_config_lines;
unsigned int curr;
unsigned int pos;
char in_quote;
bool in_escape;
unsigned int include_depth;
struct yconf *y;
struct absout *errout;
};
struct yconf {
enum ystate state;
int version;
struct map_info *map_info;
struct keyval_info *keyval_info;
/* main keyvalue types. */
char *name;
char *accepter;
char *driver;
char *connector;
char *value;
char *class;
unsigned int timeout;
bool enable;
char **seq;
unsigned int curr_seq;
unsigned int seq_len;
struct option_info *option_info;
char **options;
char *optionname;
unsigned int curr_option;
unsigned int options_len;
struct alias *aliases;
struct yfile *files;
struct yaml_read_handler_data *d;
struct absout sub_errout;
};
static int
yaml_verrout_d_f(struct yaml_read_handler_data *d,
struct yaml_read_file *f,
const char *str, va_list ap)
{
char buf[1024];
vsnprintf(buf, sizeof(buf), str, ap);
d->errout->out(d->errout, "%s:%lu(column %lu): %s",
f->filename,
(unsigned long) f->e.start_mark.line,
(unsigned long) f->e.start_mark.column,
buf);
return 0;
}
static int
yaml_errout(struct yconf *y, const char *str, ...)
{
va_list ap;
int rv;
va_start(ap, str);
rv = yaml_verrout_d_f(y->d, y->d->f, str, ap);
va_end(ap);
return rv;
}
static int
sub_verrout(struct absout *e, const char *str, va_list ap)
{
struct yconf *y = e->data;
int rv;
rv = yaml_verrout_d_f(y->d, y->d->f, str, ap);
return rv;
}
static int
sub_errout(struct absout *e, const char *str, ...)
{
struct yconf *y = e->data;
va_list ap;
int rv;
va_start(ap, str);
rv = yaml_verrout_d_f(y->d, y->d->f, str, ap);
va_end(ap);
return rv;
}
#ifdef DO_WORDEXP
static int
yaml_errout_d_f(struct yaml_read_handler_data *d,
struct yaml_read_file *f,
const char *str, ...)
{
va_list ap;
int rv;
va_start(ap, str);
rv = yaml_verrout_d_f(d, f, str, ap);
va_end(ap);
return rv;
}
#endif
static void
dofree(char **val)
{
if (*val) {
free(*val);
*val = NULL;
}
}
static void
yconf_cleanup_main(struct yconf *y)
{
dofree(&y->name);
dofree(&y->accepter);
dofree(&y->driver);
y->timeout = 0;
y->enable = true;
dofree(&y->connector);
dofree(&y->value);
dofree(&y->class);
dofree(&y->optionname);
if (y->options) {
unsigned int i;
for (i = 0; i < y->curr_option && y->options[i]; i++) {
free(y->options[i]);
y->options[i] = NULL;
}
}
y->curr_option = 0;
if (y->seq) {
unsigned int i;
for (i = 0; i < y->curr_seq && y->seq[i]; i++) {
free(y->seq[i]);
y->seq[i] = NULL;
}
}
y->curr_seq = 0;
}
static struct alias *
lookup_alias_len(struct yconf *y, const char *name, unsigned int len)
{
struct alias *a;
a = y->aliases;
while (a && (a->namelen != len || strncmp(a->name, name, len) != 0))
a = a->next;
return a;
}
static struct alias *
lookup_alias(struct yconf *y, const char *name)
{
return lookup_alias_len(y, name, strlen(name));
}
static int
add_alias(struct yconf *y, const char *iname, const char *ivalue)
{
struct alias *a;
char *name, *value;
name = strdup(iname);
if (!name) {
yaml_errout(y, "Out of memory allocating alias name");
return -1;
}
value = strdup(ivalue);
if (!value) {
free(name);
yaml_errout(y, "Out of memory allocating alias value");
return -1;
}
a = lookup_alias(y, name);
if (a) {
free(a->name);
free(a->value);
} else {
a = malloc(sizeof(*a));
if (!a) {
free(name);
free(value);
yaml_errout(y, "Out of memory allocating alias");
return -1;
}
a->next = y->aliases;
y->aliases = a;
}
a->name = name;
a->value = value;
a->namelen = strlen(name);
return 0;
}
static void
cleanup_yaml_read_file(struct yaml_read_handler_data *d)
{
struct yaml_read_file *old_f = d->f;
d->f = d->f->prev_f;
yaml_parser_delete(&old_f->parser);
if (old_f->closeme) {
if (old_f->ft)
f_close(old_f->ft);
#ifdef DO_WORDEXP
if (old_f->files_set)
wordfree(&old_f->files);
#endif
free(old_f);
d->include_depth--;
}
}
static bool
another_yaml_file_pending(struct yaml_read_handler_data *d)
{
#ifdef DO_WORDEXP
struct yaml_read_file *f = d->f;
return f->curr_file < f->files.we_wordc;
#else
return false;
#endif
}
static int yaml_read_handler(void *data, unsigned char *buffer, size_t size,
size_t *size_read);
/*
* Returns 0 if it successfully opened a file, 1 if not.
*/
static int
next_yaml_read_file(struct yaml_read_handler_data *d)
{
#ifdef DO_WORDEXP
struct yaml_read_file *f = d->f;
int rv;
retry:
f->filename = f->files.we_wordv[f->curr_file++];
rv = f_open(f->filename, DO_READ, 0, &f->ft);
if (rv) {
yaml_errout_d_f(d, f->prev_f,
"Unable to open file %s, skipping: %s", f->filename,
gensio_err_to_str(rv));
if (f->curr_file < f->files.we_wordc)
goto retry;
return 1;
}
yaml_parser_initialize(&f->parser);
yaml_parser_set_input(&f->parser, yaml_read_handler, d);
d->y->state = BEGIN_DOC;
return 0;
#else
return 1;
#endif
}
static int
do_include(struct yconf *y, const char *ivalue)
{
#ifdef DO_WORDEXP
struct yaml_read_file *f;
int rv;
if (y->d->include_depth > 100) {
yaml_errout(y, "Too many nested includes, you probably have a"
" circular include");
return -1;
}
f = calloc(1, sizeof(*f));
if (!f) {
yaml_errout(y, "Out of memory allocating include info");
return -1;
}
rv = wordexp(ivalue, &f->files, WRDE_NOCMD);
switch (rv) {
case 0:
break;
case WRDE_BADCHAR:
yaml_errout(y, "Bad character in include directive");
goto out_err;
case WRDE_CMDSUB:
yaml_errout(y, "Command substitution not allowed in include directive");
goto out_err;
case WRDE_NOSPACE:
yaml_errout(y, "Out of memory processing include directive");
goto out_err;
case WRDE_SYNTAX:
yaml_errout(y, "Syntax error in include directive");
goto out_err;
case WRDE_BADVAL:
default:
yaml_errout(y, "Unknown error in include directive");
goto out_err;
}
f->closeme = true;
f->files_set = true;
f->prev_f = y->d->f;
y->d->f = f;
y->d->include_depth++;
if (next_yaml_read_file(y->d))
cleanup_yaml_read_file(y->d);
return 0;
out_err:
free(f);
return -1;
#else
yaml_errout(y, "Include is not supported on this system");
return -1;
#endif
}
#define ALLOC_INC 4096
static struct yfile *
lookup_filename_len(struct yconf *y, const char *filename, unsigned int len)
{
struct yfile *f = y->files;
ftype *ft = NULL;
int rv;
unsigned int buflen = 0, newlen, outlen, readleft;
char *name, *value = NULL, *nvalue = NULL;
while (f && f->namelen == len && strncmp(f->name, filename, len) != 0)
f = f->next;
if (f)
return f;
name = strndup(filename, len);
if (!name) {
yaml_errout(y, "Out of memory allocating alias name");
return NULL;
}
rv = f_open(name, DO_READ, 0, &ft);
if (rv) {
yaml_errout(y, "Error opening %s: %s", name, gensio_err_to_str(rv));
goto out_err;
}
do {
newlen = buflen + ALLOC_INC;
nvalue = realloc(value, newlen);
if (!nvalue) {
yaml_errout(y, "Error allocating memory for file %s", name);
rv = GE_NOMEM;
goto out_err;
}
value = nvalue;
readleft = ALLOC_INC;
while (readleft > 0) {
rv = f_read(ft, value + buflen, ALLOC_INC, &outlen);
if (rv) {
if (rv == GE_REMCLOSE)
break;
yaml_errout(y, "Error reading %s: %s", name,
gensio_err_to_str(rv));
goto out_err;
}
buflen += outlen;
readleft -= outlen;
}
} while (1);
if (buflen == newlen) {
nvalue = realloc(value, buflen + 1);
if (!nvalue) {
yaml_errout(y, "Error allocating memory for file %s", name);
rv = GE_NOMEM;
goto out_err;
}
value = nvalue;
}
value[buflen] = '\0';
f = malloc(sizeof(*f));
if (!f) {
yaml_errout(y, "Error allocating memory for file struct %s", name);
goto out_err;
}
f_close(ft);
f->name = name;
f->namelen = strlen(name);
f->value = value;
f->next = y->files;
y->files = f;
return f;
out_err:
if (value)
free(value);
free(name);
if (ft)
f_close(ft);
return NULL;
}
static int
add_option(struct yconf *y, const char *name, const char *option,
const char *place)
{
if (y->curr_option >= y->options_len) {
unsigned int new_len = y->options_len + 10;
char **new_options = malloc(sizeof(char *) * new_len);
if (!new_options) {
yaml_errout(y, "Out of memory allocating option array for %s",
place);
return -1;
}
memcpy(new_options, y->options, sizeof(char *) * y->options_len);
free(y->options);
y->options = new_options;
y->options_len = new_len;
}
if (name) {
char *s;
if (option && strlen(option) > 0) {
s = malloc(strlen(name) + strlen(option) + 2);
if (s)
sprintf(s, "%s=%s", name, option);
} else {
s = strdup(name);
}
if (!s) {
yaml_errout(y, "Out of memory allocating option %s for %s",
option, place);
return -1;
}
y->options[y->curr_option] = s;
} else {
y->options[y->curr_option] = NULL;
}
y->curr_option++;
return 0;
}
static int
add_seq(struct yconf *y, const char *item, const char *place)
{
if (y->curr_seq >= y->seq_len) {
unsigned int new_len = y->seq_len + 10;
char **new_seq = malloc(sizeof(char *) * new_len);
if (!new_seq) {
yaml_errout(y, "Out of memory allocating connection array for %s",
place);
return -1;
}
memcpy(new_seq, y->seq,
sizeof(char *) * y->seq_len);
free(y->seq);
y->seq = new_seq;
y->seq_len = new_len;
}
if (item) {
y->seq[y->curr_seq] = strdup(item);
if (!y->seq[y->curr_seq]) {
yaml_errout(y, "Out of memory allocating connection %s for %s",
item, place);
return -1;
}
} else {
y->seq[y->curr_seq] = NULL;
}
y->curr_seq++;
return 0;
}
enum main_keytypes {
MAIN_KEYTYPE_name,
MAIN_KEYTYPE_accepter,
MAIN_KEYTYPE_driver,
MAIN_KEYTYPE_connector,
MAIN_KEYTYPE_value,
MAIN_KEYTYPE_class
};
#define DECL_KEYVAL(type) \
static struct keyval_info keyval_##type = { #type, \
offsetof(struct yconf, type), \
MAIN_KEYTYPE_##type }
DECL_KEYVAL(name);
DECL_KEYVAL(accepter);
DECL_KEYVAL(driver);
DECL_KEYVAL(connector);
DECL_KEYVAL(value);
DECL_KEYVAL(class);
#define KEYVAL_OFFSET(y) \
((char **) (((char *) (y)) + (y)->keyval_info->keyval_offset))
static struct scalar_next_state sc_defaults[] = {
{ "value", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_value },
{ "class", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_class },
{}
};
static struct scalar_next_state sc_default[] = {
{ "name", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_name },
{ "value", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_value },
{ "class", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_class },
{}
};
static struct scalar_next_state sc_deldefault[] = {
{ "name", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_name },
{ "class", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_class },
{}
};
static struct option_info connspec_option_info = {
"connection",
IN_MAIN_MAP,
};
static struct scalar_next_state sc_connection[] = {
{ "accepter", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_accepter },
{ "timeout", IN_CONNSPEC_TIMEOUT },
{ "enable", IN_CONNSPEC_ENABLE },
{ "connector", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_connector },
{ "options", IN_OPTIONS, WHICH_INFO_OPTION,
.option_info = &connspec_option_info },
{}
};
static struct option_info rotator_option_info = {
"rotator",
IN_MAIN_MAP,
};
static struct scalar_next_state sc_rotator[] = {
{ "accepter", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_accepter },
{ "connections", IN_ROTATOR_CONNECTIONS },
{ "options", IN_OPTIONS, WHICH_INFO_OPTION,
.option_info = &rotator_option_info },
{}
};
static struct option_info led_option_info = {
"led",
IN_MAIN_MAP,
};
static struct scalar_next_state sc_led[] = {
{ "driver", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_driver },
{ "options", IN_OPTIONS, WHICH_INFO_OPTION,
.option_info = &led_option_info },
{}
};
static struct option_info admin_option_info = {
"admin",
IN_MAIN_MAP,
};
static struct scalar_next_state sc_admin[] = {
{ "accepter", IN_MAIN_MAP_KEYVAL, WHICH_INFO_KEYVAL,
.keyval_info = &keyval_accepter },
{ "options", IN_OPTIONS, WHICH_INFO_OPTION,
.option_info = &admin_option_info },
{}
};
enum main_map_types {
MAIN_MAP_DEFAULTS,
MAIN_MAP_ADMINS,
MAIN_MAP_LEDS,
MAIN_MAP_CONNECTIONS,
MAIN_MAP_ROTATORS,
MAIN_MAP_DEFAULT,
MAIN_MAP_DELDEFAULT,
MAIN_MAP_CONNECTION,
MAIN_MAP_ROTATOR,
MAIN_MAP_LED,
MAIN_MAP_ADMIN
};
static struct map_info sc_defaults_map = {
"defaults", sc_defaults, MAIN_MAP_DEFAULTS, false, false
};
static struct map_info sc_admins_map = {
"admins", sc_admin, MAIN_MAP_ADMINS, false, false
};
static struct map_info sc_leds_map = {
"leds", sc_led, MAIN_MAP_LEDS, false, false
};
static struct map_info sc_connections_map = {
"connections", sc_connection, MAIN_MAP_CONNECTIONS, false, false
};
static struct map_info sc_rotators_map = {
"rotators", sc_rotator, MAIN_MAP_ROTATORS, false, false
};
static struct map_info sc_default_map = {
"default", sc_default, MAIN_MAP_DEFAULT, false, false
};
static struct map_info sc_deldefault_map = {
"deldefault", sc_deldefault, MAIN_MAP_DELDEFAULT, false, false
};
static struct map_info sc_connection_map = {
"connection", sc_connection, MAIN_MAP_CONNECTION, true, false
};
static struct map_info sc_rotator_map = {
"rotator", sc_rotator, MAIN_MAP_ROTATOR, true, false
};
static struct map_info sc_led_map = {
"led", sc_led, MAIN_MAP_LED, true, false
};
static struct map_info sc_admin_map = {
"admin", sc_admin, MAIN_MAP_ADMIN, false, true
};
static struct scalar_next_state sc_main[] = {
{ "defines", IN_DEFINES, .version = 2 },
{ "defaults", IN_DEFAULTS, .version = 2 },
{ "delete_defaults", IN_DELDEFAULTS, .version = 2 },
{ "admins", IN_ADMINS, .version = 2 },
{ "leds", IN_LEDS, .version = 2 },
{ "connections", IN_CONNECTIONS, .version = 2 },
{ "rotators", IN_ROTATORS, .version = 2 },
{ "include", IN_INCLUDE },
{ "define", IN_DEFINE, .version = 1 },
{ "default", IN_MAIN_NAME, WHICH_INFO_MAP, .map_info = &sc_default_map,
.version = 1 },
{ "delete_default", IN_MAIN_NAME, WHICH_INFO_MAP,
.map_info = &sc_deldefault_map, .version = 1 },
{ "connection", IN_MAIN_NAME, WHICH_INFO_MAP,
.map_info = &sc_connection_map, .version = 1 },
{ "rotator", IN_MAIN_NAME, WHICH_INFO_MAP, .map_info = &sc_rotator_map,
.version = 1},
{ "led", IN_MAIN_NAME, WHICH_INFO_MAP, .map_info = &sc_led_map,
.version = 1 },
{ "admin", IN_MAIN_NAME, WHICH_INFO_MAP, .map_info = &sc_admin_map,
.version = 1 },
{}
};
static int
setstr(char **oval, const char *ival, const char *mapname, const char *keyname,
struct yconf *y)
{
if (!ival || strlen(ival) == 0) {
yaml_errout(y, "Empty %s %s not permitted", mapname, keyname);
return -1;
}
if (*oval) {
yaml_errout(y, "%s %s already set in connection", mapname, keyname);
return -1;
}
*oval = strdup(ival);
if (!*oval) {
yaml_errout(y, "Unable to allocate %s %s", mapname, keyname);
return -1;
}
return 0;
}
static void
scalar_next_state(struct yconf *y,
struct scalar_next_state *s, const char *scalar)
{
while (s->name) {
if (strcasecmp(s->name, scalar) == 0) {
if (y->version && s->version && y->version != s->version) {
yaml_errout(y, "Mixed version in yaml file");
y->state = PARSE_ERR;
return;
}
if (s->version)
y->version = s->version;
switch (s->infotype) {
case WHICH_INFO_NONE: break;
case WHICH_INFO_OPTION: y->option_info = s->option_info; break;
case WHICH_INFO_KEYVAL: y->keyval_info = s->keyval_info; break;
case WHICH_INFO_MAP: y->map_info = s->map_info; break;
}
y->state = s->next_state;
return;
}
s++;
}
y->state = PARSE_ERR;
}
/*
* Convert *(xxx) into the alias text and *{filename} into the
* file's contents.
*/
static char *
process_scalar(struct yconf *y, const char *iscalar)
{
const char *s, *start = NULL;
char *rv = NULL, *out = NULL;
unsigned int len = 0, alen;
int state = 0;
char actchar;
if (y->version == 1)
actchar = '*';
else
actchar = '=';
restart:
for (s = iscalar; *s; s++) {
if (state == 0) {
if (*s == actchar)
state = 1;
else {
if (out)
*out++ = *s;
len++;
}
} else if (state == 1) {
/* Last character was a actchar */
if (*s == '(') {
start = s + 1;