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dpavlin |
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/* |
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* Cisco router simulation platform. |
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* Copyright (c) 2007 Christophe Fillot (cf@utc.fr) |
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* |
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* ROMMON Environment Variables. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include "utils.h" |
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#include "rommon_var.h" |
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/* Load file containing ROMMON variables */ |
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int rommon_load_file(struct rommon_var_list *rvl) |
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{ |
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char buffer[512]; |
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FILE *fd; |
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if (!rvl->filename) |
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return(-1); |
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if (!(fd = fopen(rvl->filename,"r"))) { |
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fprintf(stderr,"%s: unable to create file %s (%s)\n", |
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__func__,rvl->filename,strerror(errno)); |
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return(-1); |
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} |
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while(!feof(fd)) { |
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if (m_fgets(buffer,sizeof(buffer),fd)) |
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rommon_var_add_str(rvl,buffer); |
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} |
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fclose(fd); |
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return(0); |
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} |
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/* Write a file with all ROMMON variables */ |
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int rommon_var_update_file(struct rommon_var_list *rvl) |
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{ |
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struct rommon_var *var; |
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FILE *fd; |
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if (!rvl->filename) |
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return(-1); |
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if (!(fd = fopen(rvl->filename,"w"))) { |
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fprintf(stderr,"%s: unable to create file %s (%s)\n", |
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__func__,rvl->filename,strerror(errno)); |
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return(-1); |
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} |
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for(var=rvl->var_list;var;var=var->next) |
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fprintf(fd,"%s=%s\n",var->name,var->value ? var->value : ""); |
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fclose(fd); |
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return(0); |
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} |
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/* Find the specified variable */ |
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struct rommon_var *rommon_var_find(struct rommon_var_list *rvl,char *name) |
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{ |
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struct rommon_var *var; |
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for(var=rvl->var_list;var;var=var->next) |
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if (!strcmp(var->name,name)) |
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return var; |
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return NULL; |
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} |
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/* Create a new variable */ |
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static struct rommon_var *rommon_var_create(char *name) |
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{ |
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struct rommon_var *var; |
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if (!(var = malloc(sizeof(*var)))) |
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return NULL; |
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var->next = NULL; |
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var->value = NULL; |
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var->name = strdup(name); |
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if (!var->name) { |
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free(var); |
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return NULL; |
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} |
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return var; |
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} |
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/* Set value for a variable */ |
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static int rommon_var_set(struct rommon_var *var,char *value) |
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{ |
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char *new_value; |
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if (!(new_value = strdup(value))) |
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return(-1); |
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/* free old value */ |
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if (var->value) |
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free(var->value); |
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var->value = new_value; |
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return(0); |
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} |
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/* Add a new variable */ |
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int rommon_var_add(struct rommon_var_list *rvl,char *name,char *value) |
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{ |
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struct rommon_var *var; |
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/* if the variable already exists, overwrite it */ |
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if (!(var = rommon_var_find(rvl,name))) { |
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var = rommon_var_create(name); |
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if (!var) return(-1); |
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if (rommon_var_set(var,value) == -1) |
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return(-1); |
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var->next = rvl->var_list; |
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rvl->var_list = var; |
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} else { |
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rommon_var_set(var,value); |
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} |
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/* synchronize disk file */ |
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return(rommon_var_update_file(rvl)); |
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} |
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/* |
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* Add a new variable, specified at the format: var=value. |
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* The string is modified. |
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*/ |
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int rommon_var_add_str(struct rommon_var_list *rvl,char *str) |
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{ |
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char *eq_sym; |
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if (!(eq_sym = strchr(str,'='))) |
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return(-1); |
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/* The variable cannot be null */ |
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if (str == eq_sym) |
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return(-1); |
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*eq_sym = 0; |
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return(rommon_var_add(rvl,str,eq_sym+1)); |
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} |
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/* Get the specified variable */ |
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int rommon_var_get(struct rommon_var_list *rvl,char *name, |
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char *buffer,size_t len) |
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{ |
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struct rommon_var *var; |
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if (!(var = rommon_var_find(rvl,name)) || !var->value) |
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return(-1); |
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strncpy(buffer,var->value,len-1); |
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buffer[len-1] = '\0'; |
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return(0); |
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} |