openkylin
/
net-snmp
4
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
net-snmp/snmplib/text_utils.c

529 lines
13 KiB
C
Raw Blame History

#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-features.h>
#include <net-snmp/net-snmp-includes.h>
#include <stdio.h>
#include <ctype.h>
#if HAVE_STDLIB_H
# include <stdlib.h>
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#if HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
#endif
#include <sys/types.h>
#if HAVE_LIMITS_H
# include <limits.h>
#endif
#if HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#include <errno.h>
#if HAVE_DMALLOC_H
# include <dmalloc.h>
#endif
#include <net-snmp/types.h>
#include <net-snmp/library/snmp_debug.h>
#include <net-snmp/library/container.h>
#include <net-snmp/library/file_utils.h>
#include <net-snmp/library/text_utils.h>
netsnmp_feature_child_of(text_utils, libnetsnmp)
netsnmp_feature_provide(text_utils)
#ifdef NETSNMP_FEATURE_REQUIRE_TEXT_UTILS
netsnmp_feature_require(file_utils)
#endif /* NETSNMP_FEATURE_REQUIRE_TEXT_UTILS */
#ifndef NETSNMP_FEATURE_REMOVE_TEXT_UTILS
/*------------------------------------------------------------------
*
* Prototypes
*
*/
/*
* parse methods
*/
static void
_pm_save_index_string_string(FILE *f, netsnmp_container *cin,
int flags);
static void
_pm_save_everything(FILE *f, netsnmp_container *cin, int flags);
static void
_pm_user_function(FILE *f, netsnmp_container *cin,
netsnmp_line_process_info *lpi, int flags);
/*
* line processors
*/
static int
_process_line_tvi(netsnmp_line_info *line_info, void *mem,
struct netsnmp_line_process_info_s* lpi);
/*------------------------------------------------------------------
*
* Text file processing functions
*
*/
/**
* process text file, reading into extras
*/
netsnmp_container *
netsnmp_file_text_parse(netsnmp_file *f, netsnmp_container *cin,
int parse_mode, u_int flags, void *context)
{
netsnmp_container *c = cin;
FILE *fin;
int rc;
if (NULL == f)
return NULL;
if ((NULL == c) && (!(flags & PM_FLAG_NO_CONTAINER))) {
c = netsnmp_container_find("text_parse:binary_array");
if (NULL == c)
return NULL;
}
rc = netsnmp_file_open(f);
if (rc < 0) { /** error already logged */
if ((NULL !=c) && (c != cin))
CONTAINER_FREE(c);
return NULL;
}
/*
* get a stream from the file descriptor. This DOES NOT rewind the
* file (if fd was previously opened).
*/
fin = fdopen(f->fd, "r");
if (NULL == fin) {
if (NS_FI_AUTOCLOSE(f->ns_flags))
close(f->fd);
if ((NULL !=c) && (c != cin))
CONTAINER_FREE(c);
return NULL;
}
switch (parse_mode) {
case PM_SAVE_EVERYTHING:
_pm_save_everything(fin, c, flags);
break;
case PM_INDEX_STRING_STRING:
_pm_save_index_string_string(fin, c, flags);
break;
case PM_USER_FUNCTION:
if (NULL != context)
_pm_user_function(fin, c, (netsnmp_line_process_info*)context,
flags);
break;
default:
snmp_log(LOG_ERR, "unknown parse mode %d\n", parse_mode);
break;
}
/*
* close the stream, which will have the side effect of also closing
* the file descriptor, so we need to reset it.
*/
fclose(fin);
f->fd = -1;
return c;
}
netsnmp_feature_child_of(text_token_container_from_file, netsnmp_unused)
#ifndef NETSNMP_FEATURE_REMOVE_TEXT_TOKEN_CONTAINER_FROM_FILE
netsnmp_container *
netsnmp_text_token_container_from_file(const char *file, u_int flags,
netsnmp_container *cin, void *context)
{
netsnmp_line_process_info lpi;
netsnmp_container *c = cin, *c_rc;
netsnmp_file *fp;
if (NULL == file)
return NULL;
/*
* allocate file resources
*/
fp = netsnmp_file_fill(NULL, file, O_RDONLY, 0, 0);
if (NULL == fp) /** msg already logged */
return NULL;
memset(&lpi, 0x0, sizeof(lpi));
lpi.mem_size = sizeof(netsnmp_token_value_index);
lpi.process = _process_line_tvi;
lpi.user_context = context;
if (NULL == c) {
c = netsnmp_container_find("string:binary_array");
if (NULL == c) {
snmp_log(LOG_ERR,"malloc failed\n");
netsnmp_file_release(fp);
return NULL;
}
}
c_rc = netsnmp_file_text_parse(fp, c, PM_USER_FUNCTION, 0, &lpi);
/*
* if we got a bad return and the user didn't pass us a container,
* we need to release the container we allocated.
*/
if ((NULL == c_rc) && (NULL == cin)) {
CONTAINER_FREE(c);
c = NULL;
}
else
c = c_rc;
/*
* release file resources
*/
netsnmp_file_release(fp);
return c;
}
#endif /* NETSNMP_FEATURE_REMOVE_TEXT_TOKEN_CONTAINER_FROM_FILE */
/*------------------------------------------------------------------
*
* Text file process modes helper functions
*
*/
/**
* @internal
* parse mode: save everything
*/
static void
_pm_save_everything(FILE *f, netsnmp_container *cin, int flags)
{
char line[STRINGMAX], *ptr;
size_t len;
netsnmp_assert(NULL != f);
netsnmp_assert(NULL != cin);
while (fgets(line, sizeof(line), f) != NULL) {
ptr = line;
len = strlen(line) - 1;
if (line[len] == '\n')
line[len] = 0;
/*
* save blank line or comment?
*/
if (flags & PM_FLAG_SKIP_WHITESPACE) {
if (NULL == (ptr = skip_white(ptr)))
continue;
}
ptr = strdup(line);
if (NULL == ptr) {
snmp_log(LOG_ERR,"malloc failed\n");
break;
}
CONTAINER_INSERT(cin,ptr);
}
}
/**
* @internal
* parse mode:
*/
static void
_pm_save_index_string_string(FILE *f, netsnmp_container *cin,
int flags)
{
char line[STRINGMAX], *ptr;
netsnmp_token_value_index *tvi;
size_t count = 0, len;
netsnmp_assert(NULL != f);
netsnmp_assert(NULL != cin);
while (fgets(line, sizeof(line), f) != NULL) {
++count;
ptr = line;
len = strlen(line) - 1;
if (line[len] == '\n')
line[len] = 0;
/*
* save blank line or comment?
*/
if (flags & PM_FLAG_SKIP_WHITESPACE) {
if (NULL == (ptr = skip_white(ptr)))
continue;
}
tvi = SNMP_MALLOC_TYPEDEF(netsnmp_token_value_index);
if (NULL == tvi) {
snmp_log(LOG_ERR,"malloc failed\n");
break;
}
/*
* copy whole line, then set second pointer to
* after token. One malloc, 2 strings!
*/
tvi->index = count;
tvi->token = strdup(line);
if (NULL == tvi->token) {
snmp_log(LOG_ERR,"malloc failed\n");
free(tvi);
break;
}
tvi->value.cp = skip_not_white(tvi->token);
if (NULL != tvi->value.cp) {
*(tvi->value.cp) = 0;
++(tvi->value.cp);
}
CONTAINER_INSERT(cin, tvi);
}
}
/**
* @internal
* parse mode:
*/
static void
_pm_user_function(FILE *f, netsnmp_container *cin,
netsnmp_line_process_info *lpi, int flags)
{
char buf[STRINGMAX];
netsnmp_line_info li;
void *mem = NULL;
int rc;
netsnmp_assert(NULL != f);
netsnmp_assert(NULL != cin);
/*
* static buf, or does the user want the memory?
*/
if (flags & PMLP_FLAG_ALLOC_LINE) {
if (0 != lpi->line_max)
li.line_max = lpi->line_max;
else
li.line_max = STRINGMAX;
li.line = (char *)calloc(li.line_max, 1);
if (NULL == li.line) {
snmp_log(LOG_ERR,"malloc failed\n");
return;
}
}
else {
li.line = buf;
li.line_max = sizeof(buf);
}
li.index = 0;
while (fgets(li.line, li.line_max, f) != NULL) {
++li.index;
li.start = li.line;
li.line_len = strlen(li.line) - 1;
if ((!(lpi->flags & PMLP_FLAG_LEAVE_NEWLINE)) &&
(li.line[li.line_len] == '\n'))
li.line[li.line_len] = 0;
/*
* save blank line or comment?
*/
if (!(lpi->flags & PMLP_FLAG_PROCESS_WHITESPACE)) {
if (NULL == (li.start = skip_white(li.start)))
continue;
}
/*
* do we need to allocate memory for the use?
* if the last call didn't use the memory we allocated,
* re-use it. Otherwise, allocate new chunk.
*/
if ((0 != lpi->mem_size) && (NULL == mem)) {
mem = calloc(lpi->mem_size, 1);
if (NULL == mem) {
snmp_log(LOG_ERR,"malloc failed\n");
break;
}
}
/*
* do they want a copy ot the line?
*/
if (lpi->flags & PMLP_FLAG_STRDUP_LINE) {
li.start = strdup(li.start);
if (NULL == li.start) {
snmp_log(LOG_ERR,"malloc failed\n");
break;
}
}
else if (lpi->flags & PMLP_FLAG_ALLOC_LINE) {
li.start = li.line;
}
/*
* call the user function. If the function wants to save
* the memory chunk, insert it in the container, the clear
* pointer so we reallocate next time.
*/
li.start_len = strlen(li.start);
rc = (*lpi->process)(&li, mem, lpi);
if (PMLP_RC_MEMORY_USED == rc) {
if (!(lpi->flags & PMLP_FLAG_NO_CONTAINER))
CONTAINER_INSERT(cin, mem);
mem = NULL;
if (lpi->flags & PMLP_FLAG_ALLOC_LINE) {
li.line = (char *)calloc(li.line_max, 1);
if (NULL == li.line) {
snmp_log(LOG_ERR,"malloc failed\n");
break;
}
}
}
else if (PMLP_RC_MEMORY_UNUSED == rc ) {
/*
* they didn't use the memory. if li.start was a strdup, we have
* to release it. leave mem, we can re-use it (its a fixed size).
*/
if (lpi->flags & PMLP_FLAG_STRDUP_LINE)
free(li.start); /* no point in SNMP_FREE */
}
else {
if (PMLP_RC_STOP_PROCESSING != rc )
snmp_log(LOG_ERR, "unknown rc %d from text processor\n", rc);
break;
}
}
SNMP_FREE(mem);
}
/*------------------------------------------------------------------
*
* Test line process helper functions
*
*/
/**
* @internal
* process token value index line
*/
static int
_process_line_tvi(netsnmp_line_info *line_info, void *mem,
struct netsnmp_line_process_info_s* lpi)
{
netsnmp_token_value_index *tvi = (netsnmp_token_value_index *)mem;
char *ptr;
/*
* get token
*/
ptr = skip_not_white(line_info->start);
if (NULL == ptr) {
DEBUGMSGTL(("text:util:tvi", "no value after token '%s'\n",
line_info->start));
return PMLP_RC_MEMORY_UNUSED;
}
/*
* null terminate, search for value;
*/
*(ptr++) = 0;
ptr = skip_white(ptr);
if (NULL == ptr) {
DEBUGMSGTL(("text:util:tvi", "no value after token '%s'\n",
line_info->start));
return PMLP_RC_MEMORY_UNUSED;
}
/*
* get value
*/
switch((int)(intptr_t)lpi->user_context) {
case PMLP_TYPE_UNSIGNED:
tvi->value.ul = strtoul(ptr, NULL, 0);
if ((errno == ERANGE) && (ULONG_MAX == tvi->value.ul))
snmp_log(LOG_WARNING,"value overflow\n");
break;
case PMLP_TYPE_INTEGER:
tvi->value.sl = strtol(ptr, NULL, 0);
if ((errno == ERANGE) &&
((LONG_MAX == tvi->value.sl) ||
(LONG_MIN == tvi->value.sl)))
snmp_log(LOG_WARNING,"value over/under-flow\n");
break;
case PMLP_TYPE_STRING:
tvi->value.cp = strdup(ptr);
break;
case PMLP_TYPE_BOOLEAN:
if (isdigit((unsigned char)(*ptr)))
tvi->value.ul = strtoul(ptr, NULL, 0);
else if (strcasecmp(ptr,"true") == 0)
tvi->value.ul = 1;
else if (strcasecmp(ptr,"false") == 0)
tvi->value.ul = 0;
else {
snmp_log(LOG_WARNING,"bad value for boolean\n");
return PMLP_RC_MEMORY_UNUSED;
}
break;
default:
snmp_log(LOG_ERR,"unsupported value type %d\n",
(int)(intptr_t)lpi->user_context);
break;
}
/*
* save token and value
*/
tvi->token = strdup(line_info->start);
tvi->index = line_info->index;
return PMLP_RC_MEMORY_USED;
}
#else /* ! NETSNMP_FEATURE_REMOVE_TEXT_UTILS */
netsnmp_feature_unused(text_utils);
#endif /* ! NETSNMP_FEATURE_REMOVE_TEXT_UTILS */
Reference in New Issue View Git Blame Copy Permalink