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https://gitlab.com/libvirt/libvirt.git
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869 lines
20 KiB
C
869 lines
20 KiB
C
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/**
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* conf.c: parser for a subset of the Python encoded Xen configuration files
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*
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* Copyright (C) 2006 Red Hat, Inc.
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*
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* See COPYING.LIB for the License of this software
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*
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* Daniel Veillard <veillard@redhat.com>
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*/
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#define _GNU_SOURCE /* want strndup ! */
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "internal.h"
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#include "xml.h"
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#include "conf.h"
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/************************************************************************
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* *
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* Structures and macros used by the mini parser *
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* *
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************************************************************************/
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typedef struct _virConfParserCtxt virConfParserCtxt;
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typedef virConfParserCtxt *virConfParserCtxtPtr;
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struct _virConfParserCtxt {
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const char* filename;
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const char* base;
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const char* cur;
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const char *end;
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int line;
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virConfPtr conf;
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};
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#define CUR (*ctxt->cur)
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#define NEXT if (ctxt->cur < ctxt->end) ctxt->cur++;
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#define IS_EOL(c) (((c) == '\n') || ((c) == '\r'))
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#define IS_BLANK(c) (((c) == ' ') || ((c) == '\n') || ((c) == '\r') || \
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((c) == '\t'))
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#define SKIP_BLANKS {while ((ctxt->cur < ctxt->end) && (IS_BLANK(CUR))){\
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if (CUR == '\n') ctxt->line++; \
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ctxt->cur++;}}
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#define IS_SPACE(c) (((c) == ' ') || ((c) == '\t'))
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#define SKIP_SPACES {while ((ctxt->cur < ctxt->end) && (IS_SPACE(CUR))) \
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ctxt->cur++;}
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#define IS_CHAR(c) ((((c) >= 'a') && ((c) <= 'z')) || \
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(((c) >= 'A') && ((c) <= 'Z')))
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#define IS_DIGIT(c) (((c) >= '0') && ((c) <= '9'))
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/************************************************************************
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* *
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* Structures used by configuration data *
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* *
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************************************************************************/
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typedef struct _virConfEntry virConfEntry;
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typedef virConfEntry *virConfEntryPtr;
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struct _virConfEntry {
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virConfEntryPtr next;
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char* name;
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char* comment;
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virConfValuePtr value;
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};
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struct _virConf {
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const char* filename;
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virConfEntryPtr entries;
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};
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/**
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* virConfError:
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* @conf: the configuration if available
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* @error: the error number
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* @info: extra information string
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* @line: line for the error
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*
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* Handle an error at the xend daemon interface
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*/
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static void
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virConfError(virConfPtr conf ATTRIBUTE_UNUSED,
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virErrorNumber error, const char *info, int line)
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{
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const char *errmsg;
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if (error == VIR_ERR_OK)
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return;
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errmsg = __virErrorMsg(error, info);
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__virRaiseError(NULL, NULL, VIR_FROM_CONF, error, VIR_ERR_ERROR,
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errmsg, info, NULL, line, 0, errmsg, info, line);
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}
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/************************************************************************
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* *
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* Structures allocations and deallocations *
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* *
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************************************************************************/
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static void virConfFreeValue(virConfValuePtr val);
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/**
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* virConfFreeList:
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* @list: the list to free
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*
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* Free a list
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*/
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static void
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virConfFreeList(virConfValuePtr list)
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{
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virConfValuePtr next;
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while (list != NULL) {
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next = list->next;
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list->next = NULL;
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virConfFreeValue(list);
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list = next;
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}
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}
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/**
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* virConfFreeValue:
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* @val: the value to free
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*
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* Free a value
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*/
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static void
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virConfFreeValue(virConfValuePtr val)
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{
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if (val == NULL)
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return;
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if (val->str != NULL)
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free(val->str);
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if (val->list != NULL)
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virConfFreeList(val->list);
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free(val);
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}
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/**
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* virConfCreate:
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* @filename: the name to report errors
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*
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* Create a configuration internal structure
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*
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* Returns a pointer or NULL in case of error.
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*/
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static virConfPtr
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virConfCreate(const char *filename)
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{
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virConfPtr ret;
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ret = (virConfPtr) malloc(sizeof(virConf));
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if (ret == NULL) {
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virConfError(NULL, VIR_ERR_NO_MEMORY, "Allocating configuration", 0);
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return(NULL);
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}
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memset(ret, 0, sizeof(virConf));
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ret->filename = filename;
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return(ret);
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}
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/**
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* virConfAddEntry:
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* @conf: the conf structure
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* @name: name of the entry or NULL for comment
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* @value: the value if any
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* @comm: extra comment for that entry if any
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*
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* add one entry to the conf, the parameters are included in the conf
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* if successful and freed on virConfFree()
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*
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* Returns a pointer to the entry or NULL in case of failure
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*/
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static virConfEntryPtr
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virConfAddEntry(virConfPtr conf, char *name, virConfValuePtr value, char *comm)
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{
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virConfEntryPtr ret, prev;
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if (conf == NULL)
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return(NULL);
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if ((comm == NULL) && (name == NULL))
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return(NULL);
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ret = (virConfEntryPtr) malloc(sizeof(virConfEntry));
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if (ret == NULL) {
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virConfError(NULL, VIR_ERR_NO_MEMORY, "Allocating configuration", 0);
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return(NULL);
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}
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memset(ret, 0, sizeof(virConfEntry));
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ret->name = name;
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ret->value = value;
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ret->comment = comm;
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if (conf->entries == NULL) {
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conf->entries = ret;
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} else {
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prev = conf->entries;
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while (prev->next != NULL)
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prev = prev->next;
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prev->next = ret;
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}
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return(ret);
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}
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/************************************************************************
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* *
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* Serialization *
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* *
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************************************************************************/
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/**
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* virConfSaveValue:
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* @buf: output buffer
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* @val: a value
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*
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* Serialize the value to the buffer
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*
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* Returns 0 in case of success, -1 in case of error.
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*/
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static int
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virConfSaveValue(virBufferPtr buf, virConfValuePtr val)
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{
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if (val == NULL)
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return(-1);
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switch (val->type) {
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case VIR_CONF_NONE:
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return(-1);
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case VIR_CONF_LONG:
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virBufferVSprintf(buf, "%ld", val->l);
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break;
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case VIR_CONF_STRING:
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if (strchr(val->str, '\n') != NULL) {
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virBufferVSprintf(buf, "\"\"\"%s\"\"\"", val->str);
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} else if (strchr(val->str, '"') == NULL) {
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virBufferVSprintf(buf, "\"%s\"", val->str);
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} else if (strchr(val->str, '\'') == NULL) {
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virBufferVSprintf(buf, "'%s'", val->str);
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} else {
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virBufferVSprintf(buf, "\"\"\"%s\"\"\"", val->str);
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}
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break;
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case VIR_CONF_LIST: {
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virConfValuePtr cur;
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cur = val->list;
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virBufferAdd(buf, "[ ", 2);
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if (cur != NULL) {
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virConfSaveValue(buf, cur);
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cur = cur->next;
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while (cur != NULL) {
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virBufferAdd(buf, ", ", 2);
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virConfSaveValue(buf, cur);
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cur = cur->next;
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}
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}
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virBufferAdd(buf, " ]", 2);
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break;
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}
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default:
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return(-1);
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}
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return(0);
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}
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/**
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* virConfSaveEntry:
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* @buf: output buffer
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* @cur: a conf entry
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*
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* Serialize the entry to the buffer
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*
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* Returns 0 in case of success, -1 in case of error.
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*/
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static int
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virConfSaveEntry(virBufferPtr buf, virConfEntryPtr cur)
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{
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if (cur->name != NULL) {
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virBufferAdd(buf, cur->name, -1);
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virBufferAdd(buf, " = ", 3);
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virConfSaveValue(buf, cur->value);
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if (cur->comment != NULL) {
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virBufferAdd(buf, " #", 2);
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virBufferAdd(buf, cur->comment, -1);
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}
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} else if (cur->comment != NULL) {
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virBufferAdd(buf, "#", 1);
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virBufferAdd(buf, cur->comment, -1);
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}
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virBufferAdd(buf, "\n", 1);
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return(0);
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}
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/************************************************************************
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* *
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* The parser core *
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* *
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************************************************************************/
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/**
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* virConfParseLong:
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* @ctxt: the parsing context
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* @val: the result
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*
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* Parse one long int value
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*
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* Returns 0 in case of success and -1 in case of error
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*/
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static int
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virConfParseLong(virConfParserCtxtPtr ctxt, long *val)
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{
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long l = 0;
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int neg = 0;
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if (CUR == '-') {
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neg = 1;
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NEXT;
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} else if (CUR == '+') {
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NEXT;
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}
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if ((ctxt->cur >= ctxt->end) || (!IS_DIGIT(CUR))) {
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virConfError(NULL, VIR_ERR_CONF_SYNTAX, "unterminated number",
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ctxt->line);
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return(-1);
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}
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while ((ctxt->cur < ctxt->end) && (IS_DIGIT(CUR))) {
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l = l * 10 + (CUR - '0');
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NEXT;
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}
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*val = l;
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return(0);
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}
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/**
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* virConfParseString:
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* @ctxt: the parsing context
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*
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* Parse one string
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*
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* Returns a pointer to the string or NULL in case of error
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*/
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static char *
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virConfParseString(virConfParserCtxtPtr ctxt)
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{
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const char *base;
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char *ret = NULL;
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if (CUR == '\'') {
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NEXT;
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base = ctxt->cur;
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while ((ctxt->cur < ctxt->end) && (CUR != '\'') && (!IS_EOL(CUR)))
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NEXT;
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if (CUR != '\'') {
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virConfError(NULL, VIR_ERR_CONF_SYNTAX, "unterminated string",
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ctxt->line);
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return(NULL);
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}
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ret = strndup(base, ctxt->cur - base);
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NEXT;
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} else if ((ctxt->cur + 6 < ctxt->end) && (ctxt->cur[0] == '"') &&
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(ctxt->cur[1] == '"') && (ctxt->cur[2] == '"')) {
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ctxt->cur += 3;
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base = ctxt->cur;
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while ((ctxt->cur + 2 < ctxt->end) && (ctxt->cur[0] == '"') &&
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(ctxt->cur[1] == '"') && (ctxt->cur[2] == '"')) {
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if (CUR == '\n') ctxt->line++;
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NEXT;
|
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}
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if ((ctxt->cur[0] != '"') || (ctxt->cur[1] != '"') ||
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(ctxt->cur[2] != '"')) {
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virConfError(NULL, VIR_ERR_CONF_SYNTAX, "unterminated string",
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ctxt->line);
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return(NULL);
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}
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ret = strndup(base, ctxt->cur - base);
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ctxt->cur += 3;
|
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|
} else if (CUR == '"') {
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|
NEXT;
|
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base = ctxt->cur;
|
||
|
while ((ctxt->cur < ctxt->end) && (CUR != '"') && (!IS_EOL(CUR)))
|
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NEXT;
|
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if (CUR != '"') {
|
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virConfError(NULL, VIR_ERR_CONF_SYNTAX, "unterminated string",
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|
ctxt->line);
|
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return(NULL);
|
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|
}
|
||
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ret = strndup(base, ctxt->cur - base);
|
||
|
NEXT;
|
||
|
}
|
||
|
return(ret);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfParseValue:
|
||
|
* @ctxt: the parsing context
|
||
|
*
|
||
|
* Parse one value
|
||
|
*
|
||
|
* Returns a pointer to the value or NULL in case of error
|
||
|
*/
|
||
|
static virConfValuePtr
|
||
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virConfParseValue(virConfParserCtxtPtr ctxt)
|
||
|
{
|
||
|
virConfValuePtr ret, lst = NULL, tmp, prev;
|
||
|
virConfType type = VIR_CONF_NONE;
|
||
|
char *str = NULL;
|
||
|
long l = 0;
|
||
|
|
||
|
SKIP_SPACES;
|
||
|
if (ctxt->cur >= ctxt->end) {
|
||
|
virConfError(NULL, VIR_ERR_CONF_SYNTAX, "expecting a value",
|
||
|
ctxt->line);
|
||
|
return(NULL);
|
||
|
}
|
||
|
if ((CUR == '"') || (CUR == '\'')) {
|
||
|
type = VIR_CONF_STRING;
|
||
|
str = virConfParseString(ctxt);
|
||
|
if (str == NULL)
|
||
|
return(NULL);
|
||
|
} else if (CUR == '[') {
|
||
|
type = VIR_CONF_LIST;
|
||
|
NEXT;
|
||
|
SKIP_BLANKS;
|
||
|
if ((ctxt->cur < ctxt->end) && (CUR != ']')) {
|
||
|
lst = virConfParseValue(ctxt);
|
||
|
SKIP_BLANKS;
|
||
|
}
|
||
|
while ((ctxt->cur < ctxt->end) && (CUR != ']')) {
|
||
|
if (CUR != ',') {
|
||
|
virConfError(NULL, VIR_ERR_CONF_SYNTAX,
|
||
|
"expecting a separator in list", ctxt->line);
|
||
|
virConfFreeList(lst);
|
||
|
return(NULL);
|
||
|
}
|
||
|
NEXT;
|
||
|
SKIP_BLANKS;
|
||
|
tmp = virConfParseValue(ctxt);
|
||
|
if (tmp == NULL) {
|
||
|
virConfFreeList(lst);
|
||
|
return(NULL);
|
||
|
}
|
||
|
prev = lst;
|
||
|
while (prev->next != NULL) prev = prev->next;
|
||
|
prev->next = tmp;
|
||
|
SKIP_BLANKS;
|
||
|
}
|
||
|
if (CUR == ']') {
|
||
|
NEXT;
|
||
|
} else {
|
||
|
virConfError(NULL, VIR_ERR_CONF_SYNTAX,
|
||
|
"list is not closed with ] ", ctxt->line);
|
||
|
virConfFreeList(lst);
|
||
|
return(NULL);
|
||
|
}
|
||
|
} else if (IS_DIGIT(CUR) || (CUR == '-') || (CUR == '+')) {
|
||
|
if (virConfParseLong(ctxt, &l) < 0) {
|
||
|
return(NULL);
|
||
|
}
|
||
|
type = VIR_CONF_LONG;
|
||
|
} else {
|
||
|
virConfError(NULL, VIR_ERR_CONF_SYNTAX, "expecting a value",
|
||
|
ctxt->line);
|
||
|
return(NULL);
|
||
|
}
|
||
|
ret = (virConfValuePtr) malloc(sizeof(virConfValue));
|
||
|
if (ret == NULL) {
|
||
|
virConfError(NULL, VIR_ERR_NO_MEMORY, "Allocating configuration", 0);
|
||
|
if (str != NULL)
|
||
|
free(str);
|
||
|
return(NULL);
|
||
|
}
|
||
|
memset(ret, 0, sizeof(virConfValue));
|
||
|
ret->type = type;
|
||
|
ret->l = l;
|
||
|
ret->str = str;
|
||
|
ret->list = lst;
|
||
|
|
||
|
return(ret);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfParseName:
|
||
|
* @ctxt: the parsing context
|
||
|
*
|
||
|
* Parse one name
|
||
|
*
|
||
|
* Returns a copy of the new string, NULL in case of error
|
||
|
*/
|
||
|
static char *
|
||
|
virConfParseName(virConfParserCtxtPtr ctxt)
|
||
|
{
|
||
|
const char *base;
|
||
|
char *ret;
|
||
|
|
||
|
SKIP_SPACES;
|
||
|
base = ctxt->cur;
|
||
|
/* TODO: probably need encoding support and UTF-8 parsing ! */
|
||
|
if (!IS_CHAR(CUR)) {
|
||
|
virConfError(NULL, VIR_ERR_CONF_SYNTAX, "expecting a name", ctxt->line);
|
||
|
return(NULL);
|
||
|
}
|
||
|
while ((ctxt->cur < ctxt->end) && ((IS_CHAR(CUR)) || (IS_DIGIT(CUR))))
|
||
|
NEXT;
|
||
|
ret = strndup(base, ctxt->cur - base);
|
||
|
if (ret == NULL) {
|
||
|
virConfError(NULL, VIR_ERR_NO_MEMORY, "Allocating configuration",
|
||
|
ctxt->line);
|
||
|
return(NULL);
|
||
|
}
|
||
|
return(ret);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfParseComment:
|
||
|
* @ctxt: the parsing context
|
||
|
*
|
||
|
* Parse one standalone comment in the configuration file
|
||
|
*
|
||
|
* Returns 0 in case of success and -1 in case of error
|
||
|
*/
|
||
|
static int
|
||
|
virConfParseComment(virConfParserCtxtPtr ctxt)
|
||
|
{
|
||
|
const char *base;
|
||
|
char *comm;
|
||
|
|
||
|
if (CUR != '#')
|
||
|
return(-1);
|
||
|
NEXT;
|
||
|
base = ctxt->cur;
|
||
|
while ((ctxt->cur < ctxt->end) && (!IS_EOL(CUR))) NEXT;
|
||
|
comm = strndup(base, ctxt->cur - base);
|
||
|
if (comm == NULL) {
|
||
|
virConfError(NULL, VIR_ERR_NO_MEMORY, "Allocating configuration",
|
||
|
ctxt->line);
|
||
|
return(-1);
|
||
|
}
|
||
|
virConfAddEntry(ctxt->conf, NULL, NULL, comm);
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfParseSeparator:
|
||
|
* @ctxt: the parsing context
|
||
|
*
|
||
|
* Parse one separator between statement if not at the end.
|
||
|
*
|
||
|
* Returns 0 in case of success and -1 in case of error
|
||
|
*/
|
||
|
static int
|
||
|
virConfParseSeparator(virConfParserCtxtPtr ctxt)
|
||
|
{
|
||
|
SKIP_SPACES;
|
||
|
if (ctxt->cur >= ctxt->end)
|
||
|
return(0);
|
||
|
if (IS_EOL(CUR)) {
|
||
|
SKIP_BLANKS
|
||
|
} else if (CUR == ';') {
|
||
|
NEXT;
|
||
|
SKIP_BLANKS;
|
||
|
} else {
|
||
|
virConfError(NULL, VIR_ERR_CONF_SYNTAX, "expecting a separator",
|
||
|
ctxt->line);
|
||
|
return(-1);
|
||
|
}
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfParseStatement:
|
||
|
* @ctxt: the parsing context
|
||
|
*
|
||
|
* Parse one statement in the conf file
|
||
|
*
|
||
|
* Returns 0 in case of success and -1 in case of error
|
||
|
*/
|
||
|
static int
|
||
|
virConfParseStatement(virConfParserCtxtPtr ctxt)
|
||
|
{
|
||
|
const char *base;
|
||
|
char *name;
|
||
|
virConfValuePtr value;
|
||
|
char *comm = NULL;
|
||
|
|
||
|
SKIP_BLANKS;
|
||
|
if (CUR == '#') {
|
||
|
return(virConfParseComment(ctxt));
|
||
|
}
|
||
|
name = virConfParseName(ctxt);
|
||
|
if (name == NULL)
|
||
|
return(-1);
|
||
|
SKIP_SPACES;
|
||
|
if (CUR != '=') {
|
||
|
virConfError(NULL, VIR_ERR_CONF_SYNTAX, "expecting an assignment",
|
||
|
ctxt->line);
|
||
|
return(-1);
|
||
|
}
|
||
|
NEXT;
|
||
|
SKIP_SPACES;
|
||
|
value = virConfParseValue(ctxt);
|
||
|
if (value == NULL) {
|
||
|
free(name);
|
||
|
return(-1);
|
||
|
}
|
||
|
SKIP_SPACES;
|
||
|
if (CUR == '#') {
|
||
|
NEXT;
|
||
|
base = ctxt->cur;
|
||
|
while ((ctxt->cur < ctxt->end) && (!IS_EOL(CUR))) NEXT;
|
||
|
comm = strndup(base, ctxt->cur - base);
|
||
|
if (comm == NULL) {
|
||
|
virConfError(NULL, VIR_ERR_NO_MEMORY, "Allocating configuration",
|
||
|
ctxt->line);
|
||
|
free(name);
|
||
|
virConfFreeValue(value);
|
||
|
return(-1);
|
||
|
}
|
||
|
}
|
||
|
if (virConfAddEntry(ctxt->conf, name, value, comm) == NULL) {
|
||
|
free(name);
|
||
|
virConfFreeValue(value);
|
||
|
if (comm != NULL)
|
||
|
free(comm);
|
||
|
return(-1);
|
||
|
}
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfParse:
|
||
|
* @filename: the name to report errors
|
||
|
* @content: the configuration content in memory
|
||
|
* @len: the length in bytes
|
||
|
*
|
||
|
* Parse the subset of the Python language needed to handle simple
|
||
|
* Xen configuration files.
|
||
|
*
|
||
|
* Returns an handle to lookup settings or NULL if it failed to
|
||
|
* read or parse the file, use virConfFree() to free the data.
|
||
|
*/
|
||
|
static virConfPtr
|
||
|
virConfParse(const char *filename, const char *content, int len) {
|
||
|
virConfParserCtxt ctxt;
|
||
|
|
||
|
ctxt.filename = filename;
|
||
|
ctxt.base = ctxt.cur = content;
|
||
|
ctxt.end = content + len - 1;
|
||
|
ctxt.line = 1;
|
||
|
|
||
|
ctxt.conf = virConfCreate(filename);
|
||
|
if (ctxt.conf == NULL)
|
||
|
return(NULL);
|
||
|
|
||
|
while (ctxt.cur < ctxt.end) {
|
||
|
if (virConfParseStatement(&ctxt) < 0)
|
||
|
goto error;
|
||
|
if (virConfParseSeparator(&ctxt) < 0)
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
return(ctxt.conf);
|
||
|
|
||
|
error:
|
||
|
virConfFree(ctxt.conf);
|
||
|
return(NULL);
|
||
|
}
|
||
|
|
||
|
/************************************************************************
|
||
|
* *
|
||
|
* The module entry points *
|
||
|
* *
|
||
|
************************************************************************/
|
||
|
|
||
|
/**
|
||
|
* virConfReadFile:
|
||
|
* @filename: the path to the configuration file.
|
||
|
*
|
||
|
* Reads a configuration file.
|
||
|
*
|
||
|
* Returns an handle to lookup settings or NULL if it failed to
|
||
|
* read or parse the file, use virConfFree() to free the data.
|
||
|
*/
|
||
|
virConfPtr
|
||
|
virConfReadFile(const char *filename)
|
||
|
{
|
||
|
char content[4096];
|
||
|
int fd;
|
||
|
int len;
|
||
|
|
||
|
if (filename == NULL) {
|
||
|
virConfError(NULL, VIR_ERR_INVALID_ARG, __FUNCTION__, 0);
|
||
|
return(NULL);
|
||
|
}
|
||
|
fd = open(filename, O_RDONLY);
|
||
|
if (fd < 0) {
|
||
|
virConfError(NULL, VIR_ERR_OPEN_FAILED, filename, 0);
|
||
|
return(NULL);
|
||
|
}
|
||
|
len = read(fd, content, sizeof(content));
|
||
|
close(fd);
|
||
|
if (len <= 0) {
|
||
|
virConfError(NULL, VIR_ERR_READ_FAILED, filename, 0);
|
||
|
return(NULL);
|
||
|
}
|
||
|
return(virConfParse(filename, content, len));
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfReadMem:
|
||
|
* @memory: pointer to the content of the configuration file
|
||
|
* @len: lenght in byte
|
||
|
*
|
||
|
* Reads a configuration file loaded in memory. The string can be
|
||
|
* zero terminated in which case @len can be 0
|
||
|
*
|
||
|
* Returns an handle to lookup settings or NULL if it failed to
|
||
|
* parse the content, use virConfFree() to free the data.
|
||
|
*/
|
||
|
virConfPtr
|
||
|
virConfReadMem(const char *memory, int len)
|
||
|
{
|
||
|
if ((memory == NULL) || (len < 0)) {
|
||
|
virConfError(NULL, VIR_ERR_INVALID_ARG, __FUNCTION__, 0);
|
||
|
return(NULL);
|
||
|
}
|
||
|
if (len == 0)
|
||
|
len = strlen(memory);
|
||
|
|
||
|
return(virConfParse("memory conf", memory, len));
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfFree:
|
||
|
* @conf: a configuration file handle
|
||
|
*
|
||
|
* Frees all data associated to the handle
|
||
|
*
|
||
|
* Returns 0 in case of success, -1 in case of error.
|
||
|
*/
|
||
|
int
|
||
|
virConfFree(virConfPtr conf)
|
||
|
{
|
||
|
if (conf == NULL) {
|
||
|
virConfError(NULL, VIR_ERR_INVALID_ARG, __FUNCTION__, 0);
|
||
|
return(-1);
|
||
|
}
|
||
|
free(conf);
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfGetValue:
|
||
|
* @conf: a configuration file handle
|
||
|
* @entry: the name of the entry
|
||
|
*
|
||
|
* Lookup the value associated to this entry in the configuration file
|
||
|
*
|
||
|
* Returns a pointer to the value or NULL if the lookup failed, the data
|
||
|
* associated will be freed when virConfFree() is called
|
||
|
*/
|
||
|
virConfValuePtr
|
||
|
virConfGetValue(virConfPtr conf, const char *setting)
|
||
|
{
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfWriteFile:
|
||
|
* @filename: the path to the configuration file.
|
||
|
* @conf: the conf
|
||
|
*
|
||
|
* Writes a configuration file back to a file.
|
||
|
*
|
||
|
* Returns the number of bytes written or -1 in case of error.
|
||
|
*/
|
||
|
int
|
||
|
virConfWriteFile(const char *filename, virConfPtr conf)
|
||
|
{
|
||
|
virBufferPtr buf;
|
||
|
virConfEntryPtr cur;
|
||
|
int ret;
|
||
|
int fd;
|
||
|
|
||
|
if (conf == NULL)
|
||
|
return(-1);
|
||
|
|
||
|
buf = virBufferNew(500);
|
||
|
if (buf == NULL)
|
||
|
return(-1);
|
||
|
|
||
|
cur = conf->entries;
|
||
|
while (cur != NULL) {
|
||
|
virConfSaveEntry(buf, cur);
|
||
|
cur = cur->next;
|
||
|
}
|
||
|
|
||
|
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR );
|
||
|
if (fd < 0) {
|
||
|
virConfError(NULL, VIR_ERR_WRITE_FAILED, "failed to open file", 0);
|
||
|
ret = -1;
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
ret = write(fd, buf->content, buf->use);
|
||
|
close(fd);
|
||
|
if (ret != (int) buf->use) {
|
||
|
virConfError(NULL, VIR_ERR_WRITE_FAILED, "failed to save content", 0);
|
||
|
ret = -1;
|
||
|
goto error;
|
||
|
}
|
||
|
error:
|
||
|
virBufferFree(buf);
|
||
|
return(ret);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* virConfWriteMem:
|
||
|
* @memory: pointer to the memory to store the config file
|
||
|
* @len: pointer to the lenght in byte of the store, on output the size
|
||
|
* @conf: the conf
|
||
|
*
|
||
|
* Writes a configuration file back to a memory area. @len is an IN/OUT
|
||
|
* parameter, it indicates the size available in bytes, and on output the
|
||
|
* size required for the configuration file (even if the call fails due to
|
||
|
* insufficient space).
|
||
|
*
|
||
|
* Returns the number of bytes written or -1 in case of error.
|
||
|
*/
|
||
|
int
|
||
|
virConfWriteMem(char *memory, int *len, virConfPtr conf)
|
||
|
{
|
||
|
virBufferPtr buf;
|
||
|
virConfEntryPtr cur;
|
||
|
int ret;
|
||
|
|
||
|
if ((memory == NULL) || (len == NULL) || (*len <= 0) || (conf == NULL))
|
||
|
return(-1);
|
||
|
|
||
|
buf = virBufferNew(500);
|
||
|
if (buf == NULL)
|
||
|
return(-1);
|
||
|
|
||
|
cur = conf->entries;
|
||
|
while (cur != NULL) {
|
||
|
virConfSaveEntry(buf, cur);
|
||
|
cur = cur->next;
|
||
|
}
|
||
|
|
||
|
if ((int) buf->use >= *len) {
|
||
|
*len = buf->use;
|
||
|
ret = -1;
|
||
|
goto error;
|
||
|
}
|
||
|
memcpy(memory, buf->content, buf->use);
|
||
|
ret = buf->use;
|
||
|
|
||
|
error:
|
||
|
virBufferFree(buf);
|
||
|
return(ret);
|
||
|
}
|