141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/*
|
|
* libifupdown/interface-file.h
|
|
* Purpose: /etc/network/interfaces parser
|
|
*
|
|
* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
|
|
*
|
|
* Permission to use, copy, modify, and/or 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.
|
|
*
|
|
* This software is provided 'as is' and without any warranty, express or
|
|
* implied. In no event shall the authors be liable for any damages arising
|
|
* from the use of this software.
|
|
*/
|
|
|
|
#include <ctype.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "libifupdown/interface-file.h"
|
|
#include "libifupdown/fgetline.h"
|
|
|
|
static char *
|
|
next_token(char **buf)
|
|
{
|
|
char *out = *buf;
|
|
|
|
while (*out && isspace(*out))
|
|
out++;
|
|
|
|
char *end = out;
|
|
while (*end && !isspace(*end))
|
|
end++;
|
|
|
|
*end++ = '\0';
|
|
*buf = end;
|
|
|
|
return out;
|
|
}
|
|
|
|
bool
|
|
lif_interface_file_parse(struct lif_dict *collection, const char *filename)
|
|
{
|
|
lif_interface_collection_init(collection);
|
|
struct lif_interface *cur_iface = NULL;
|
|
|
|
FILE *f = fopen(filename, "r");
|
|
if (f == NULL)
|
|
return false;
|
|
|
|
char linebuf[4096];
|
|
while (lif_fgetline(linebuf, sizeof linebuf, f) != NULL)
|
|
{
|
|
char *bufp = linebuf;
|
|
char *token = next_token(&bufp);
|
|
|
|
if (!*token || !isalpha(*token))
|
|
continue;
|
|
|
|
if (!strcmp(token, "source"))
|
|
{
|
|
char *source_filename = next_token(&bufp);
|
|
if (!*source_filename)
|
|
goto parse_error;
|
|
|
|
if (!strcmp(filename, source_filename))
|
|
{
|
|
fprintf(stderr, "%s: attempt to source %s would create infinite loop\n",
|
|
filename, source_filename);
|
|
goto parse_error;
|
|
}
|
|
|
|
lif_interface_file_parse(collection, source_filename);
|
|
}
|
|
else if (!strcmp(token, "auto"))
|
|
{
|
|
char *ifname = next_token(&bufp);
|
|
if (!*ifname && cur_iface == NULL)
|
|
goto parse_error;
|
|
else
|
|
{
|
|
cur_iface = lif_interface_collection_find(collection, ifname);
|
|
if (cur_iface == NULL)
|
|
goto parse_error;
|
|
}
|
|
|
|
cur_iface->is_auto = true;
|
|
}
|
|
else if (!strcmp(token, "iface"))
|
|
{
|
|
char *ifname = next_token(&bufp);
|
|
if (!*ifname)
|
|
goto parse_error;
|
|
|
|
cur_iface = lif_interface_collection_find(collection, ifname);
|
|
if (cur_iface == NULL)
|
|
goto parse_error;
|
|
|
|
/* in original ifupdown config, we can have "inet loopback"
|
|
* or "inet dhcp" or such to designate hints. lets pick up
|
|
* those hints here.
|
|
*/
|
|
char *inet_type = next_token(&bufp);
|
|
if (!*inet_type)
|
|
continue;
|
|
|
|
char *hint = next_token(&bufp);
|
|
if (!*hint)
|
|
continue;
|
|
|
|
if (!strcmp(hint, "dhcp"))
|
|
cur_iface->is_dhcp = true;
|
|
else if (!strcmp(hint, "loopback"))
|
|
cur_iface->is_loopback = true;
|
|
}
|
|
else if (!strcmp(token, "address"))
|
|
{
|
|
char *addr = next_token(&bufp);
|
|
|
|
if (cur_iface == NULL)
|
|
{
|
|
fprintf(stderr, "%s: address '%s' without interface\n", filename, addr);
|
|
goto parse_error;
|
|
}
|
|
|
|
lif_interface_address_add(cur_iface, addr);
|
|
}
|
|
else if (cur_iface != NULL)
|
|
{
|
|
lif_dict_add(&cur_iface->vars, token, strdup(bufp));
|
|
}
|
|
}
|
|
|
|
fclose(f);
|
|
return true;
|
|
|
|
parse_error:
|
|
fprintf(stderr, "libifupdown: %s: failed to parse line \"%s\"\n",
|
|
filename, linebuf);
|
|
fclose(f);
|
|
return false;
|
|
}
|