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-rw-r--r--networking/ifupdown.c207
1 files changed, 104 insertions, 103 deletions
diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index 3e18df19e..37185327b 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -1,12 +1,14 @@
/*
* ifupdown for busybox
- * Based on ifupdown by Anthony Towns
+ * Copyright (c) 2002 Glenn McGrath <bug1@optushome.com.au>
+ *
+ * Based on ifupdown v 0.6.4 by Anthony Towns
* Copyright (c) 1999 Anthony Towns <aj@azure.humbug.org.au>
*
* Changes to upstream version
- * Remove checks for kernel version, assume kernel version 2.2.0 or better
+ * Remove checks for kernel version, assume kernel version 2.2.0 or better.
* Lines in the interfaces file cannot wrap.
- * The default state file is moved to /var/run/ifstate
+ * To adhere to the FHS, the default state file is /var/run/ifstate.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -39,10 +41,11 @@
#include <unistd.h>
#include "libbb.h"
-//#include "busybox.h"
-//#include "config.h"
-#define IFUPDOWN_VERSION "0.6.4"
+#define MAX_OPT_DEPTH 10
+#define EUNBALBRACK 10001
+#define EUNDEFVAR 10002
+#define EUNBALPER 10000
typedef struct interface_defn_s interface_defn_t;
@@ -95,22 +98,13 @@ struct interface_defn_s {
};
typedef struct interfaces_file_s {
- int max_autointerfaces;
- int n_autointerfaces;
- char **autointerfaces;
-
+ llist_t *autointerfaces;
interface_defn_t *ifaces;
mapping_defn_t *mappings;
} interfaces_file_t;
-#define MAX_OPT_DEPTH 10
-#define EUNBALBRACK 10001
-#define EUNDEFVAR 10002
-#define MAX_VARNAME 32
-#define EUNBALPER 10000
-
-static int no_act = 0;
-static int verbose = 0;
+static char no_act = 0;
+static char verbose = 0;
static char **environ = NULL;
static void addstr(char **buf, size_t *len, size_t *pos, char *str, size_t str_length)
@@ -608,6 +602,17 @@ static int duplicate_if(interface_defn_t *ifa, interface_defn_t *ifb)
return(1);
}
+static const llist_t *find_list_string(const llist_t *list, const char *string)
+{
+ while (list) {
+ if (strcmp(list->data, string) == 0) {
+ return(list);
+ }
+ list = list->link;
+ }
+ return(NULL);
+}
+
static interfaces_file_t *read_interfaces(char *filename)
{
interface_defn_t *currif = NULL;
@@ -624,7 +629,7 @@ static interfaces_file_t *read_interfaces(char *filename)
enum { NONE, IFACE, MAPPING } currently_processing = NONE;
defn = xmalloc(sizeof(interfaces_file_t));
- defn->max_autointerfaces = defn->n_autointerfaces = 0;
+// defn->max_autointerfaces = defn->n_autointerfaces = 0;
defn->autointerfaces = NULL;
defn->mappings = NULL;
defn->ifaces = NULL;
@@ -752,26 +757,14 @@ static interfaces_file_t *read_interfaces(char *filename)
currently_processing = IFACE;
} else if (strcmp(firstword, "auto") == 0) {
while ((rest = next_word(rest, firstword, 80))) {
- int i;
-
- for (i = 0; i < defn->n_autointerfaces; i++) {
- if (strcmp(firstword, defn->autointerfaces[i]) == 0) {
- perror_msg("interface declared auto twice \"%s\"", buf);
- return NULL;
- }
- }
-
- if (defn->n_autointerfaces == defn->max_autointerfaces) {
- char **tmp;
- defn->max_autointerfaces *= 2;
- defn->max_autointerfaces++;
- tmp = xrealloc(defn->autointerfaces, sizeof(*tmp) * defn->max_autointerfaces);
- defn->autointerfaces = tmp;
+ /* Check the interface isnt already listed */
+ if (find_list_string(defn->autointerfaces, firstword)) {
+ perror_msg_and_die("interface declared auto twice \"%s\"", buf);
}
- defn->autointerfaces[defn->n_autointerfaces] = xstrdup(firstword);
- defn->n_autointerfaces++;
+ /* Add the interface to the list */
+ defn->autointerfaces = llist_add_to(defn->autointerfaces, strdup(firstword));
}
currently_processing = NONE;
} else {
@@ -1095,29 +1088,19 @@ static int run_mapping(char *physical, char *logical, int len, mapping_defn_t *
}
#endif /* CONFIG_FEATURE_IFUPDOWN_IPV6 */
-static int lookfor_iface(char **ifaces, int n_ifaces, char *iface)
+static llist_t *find_iface_state(llist_t *state_list, const char *iface)
{
- int i;
+ unsigned short iface_len = xstrlen(iface);
+ llist_t *search = state_list;
- for (i = 0; i < n_ifaces; i++) {
- if (strncmp(iface, ifaces[i], xstrlen(iface)) == 0) {
- if (ifaces[i][xstrlen(iface)] == '=') {
- return i;
- }
+ while (search) {
+ if ((strncmp(search->data, iface, iface_len) == 0) &&
+ (search->data[iface_len] == '=')) {
+ return(search);
}
+ search = search->link;
}
-
- return(-1);
-}
-
-static void add_to_state(char ***ifaces, int *n_ifaces, int *max_ifaces, char *new_iface)
-{
- if (*max_ifaces == *n_ifaces) {
- *max_ifaces = (*max_ifaces * 2) + 1;
- *ifaces = xrealloc(*ifaces, sizeof(**ifaces) * *max_ifaces);
- }
-
- (*ifaces)[(*n_ifaces)++] = new_iface;
+ return(NULL);
}
extern int ifupdown_main(int argc, char **argv)
@@ -1125,19 +1108,16 @@ extern int ifupdown_main(int argc, char **argv)
int (*cmds) (interface_defn_t *) = NULL;
interfaces_file_t *defn;
FILE *state_fp = NULL;
- char **target_iface = NULL;
- char **state = NULL; /* list of iface=liface */
+ llist_t *state_list = NULL;
+ llist_t *target_list = NULL;
char *interfaces = "/etc/network/interfaces";
- char *statefile = "/var/run/ifstate";
+ const char *statefile = "/var/run/ifstate";
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
int run_mappings = 1;
#endif
int do_all = 0;
int force = 0;
- int n_target_ifaces = 0;
- int n_state = 0;
- int max_state = 0;
int i;
if (applet_name[2] == 'u') {
@@ -1195,11 +1175,13 @@ extern int ifupdown_main(int argc, char **argv)
error_msg_and_die("couldn't read interfaces file \"%s\"", interfaces);
}
- state_fp = fopen(statefile, no_act ? "r" : "a+");
- if (state_fp == NULL && !no_act) {
- perror_msg_and_die("failed to open statefile %s", statefile);
+ if (no_act) {
+ state_fp = fopen(statefile, "r");
+ } else {
+ state_fp = xfopen(statefile, "a+");
}
+ /* Read the previous state from the state file */
if (state_fp != NULL) {
char *start;
while ((start = get_line_from_file(state_fp)) != NULL) {
@@ -1207,61 +1189,65 @@ extern int ifupdown_main(int argc, char **argv)
/* We should only need to check for a single character */
end_ptr = start + strcspn(start, " \t\n");
*end_ptr = '\0';
- add_to_state(&state, &n_state, &max_state, start);
+ state_list = llist_add_to(state_list, start);
}
}
+ /* Create a list of interfaces to work on */
if (do_all) {
if (cmds == iface_up) {
- target_iface = defn->autointerfaces;
- n_target_ifaces = defn->n_autointerfaces;
+ target_list = defn->autointerfaces;
} else if (cmds == iface_down) {
- target_iface = state;
- n_target_ifaces = n_state;
+ const llist_t *list = state_list;
+ while (list) {
+ target_list = llist_add_to(target_list, strdup(list->data));
+ list = list->link;
+ }
}
} else {
- target_iface = argv + optind;
- n_target_ifaces = argc - optind;
+ target_list = llist_add_to(target_list, argv[optind]);
}
- for (i = 0; i < n_target_ifaces; i++) {
+ /* Update the interfaces */
+ while (target_list) {
interface_defn_t *currif;
- char iface[80];
- char liface[80];
+ char *iface;
+ char *liface;
char *pch;
int okay = 0;
- strncpy(iface, target_iface[i], sizeof(iface));
- iface[sizeof(iface) - 1] = '\0';
+ iface = strdup(target_list->data);
+ target_list = target_list->link;
- if ((pch = strchr(iface, '='))) {
+ pch = strchr(iface, '=');
+ if (pch) {
*pch = '\0';
- strncpy(liface, pch + 1, sizeof(liface));
- liface[sizeof(liface) - 1] = '\0';
+ liface = strdup(pch + 1);
} else {
- strncpy(liface, iface, sizeof(liface));
- liface[sizeof(liface) - 1] = '\0';
+ liface = strdup(iface);
}
+
if (!force) {
- int already_up = lookfor_iface(state, n_state, iface);;
+ const llist_t *iface_state = find_iface_state(state_list, iface);
if (cmds == iface_up) {
/* ifup */
- if (already_up != -1) {
+ if (iface_state) {
error_msg("interface %s already configured", iface);
continue;
}
} else {
/* ifdown */
- if (already_up == -1) {
+ if (iface_state == NULL) {
error_msg("interface %s not configured", iface);
continue;
}
- strncpy(liface, strchr(state[already_up], '=') + 1, 80);
- liface[79] = 0;
+ pch = strchr(iface_state->data, '=');
+ liface = strdup(pch + 1);
}
}
+
#ifdef CONFIG_FEATURE_IFUPDOWN_MAPPING
if ((cmds == iface_up) && run_mappings) {
mapping_defn_t *currmap;
@@ -1286,13 +1272,13 @@ extern int ifupdown_main(int argc, char **argv)
char *oldiface = currif->iface;
okay = 1;
-
currif->iface = iface;
if (verbose) {
error_msg("Configuring interface %s=%s (%s)", iface, liface, currif->address_family->name);
}
+ /* Call the cmds function pointer, does either iface_up() or iface_down() */
if (cmds(currif) == -1) {
printf
("Don't seem to be have all the variables for %s/%s.\n",
@@ -1306,39 +1292,54 @@ extern int ifupdown_main(int argc, char **argv)
if (!okay && !force) {
error_msg("Ignoring unknown interface %s=%s.", iface, liface);
} else {
- int already_up = lookfor_iface(state, n_state, iface);
+ llist_t *iface_state = find_iface_state(state_list, iface);
if (cmds == iface_up) {
char *newiface = xmalloc(xstrlen(iface) + 1 + xstrlen(liface) + 1);
sprintf(newiface, "%s=%s", iface, liface);
- if (already_up == -1) {
- add_to_state(&state, &n_state, &max_state, newiface);
+ if (iface_state == NULL) {
+ state_list = llist_add_to(state_list, newiface);
} else {
- free(state[already_up]);
- state[already_up] = newiface;
+ free(iface_state->data);
+ iface_state->data = newiface;
}
} else if (cmds == iface_down) {
- if (already_up != -1) {
- state[already_up] = state[--n_state];
+ /* Remove an interface from the linked list */
+ if (iface_state) {
+ /* This needs to be done better */
+ free(iface_state->data);
+ free(iface_state->link);
+ if (iface_state->link) {
+ iface_state->data = iface_state->link->data;
+ iface_state->link = iface_state->link->link;
+ } else {
+ iface_state->data = NULL;
+ iface_state->link = NULL;
+ }
}
}
}
- if (state_fp != NULL && !no_act) {
- unsigned short j;
+ }
- if (ftruncate(fileno(state_fp), 0) < 0) {
- error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
- }
+ /* Actually write the new state */
+ if (state_fp != NULL && !no_act) {
+ if (ftruncate(fileno(state_fp), 0) < 0) {
+ error_msg_and_die("failed to truncate statefile %s: %s", statefile, strerror(errno));
+ }
+
+ rewind(state_fp);
- rewind(state_fp);
- for (j = 0; j < n_state; j++) {
- fputs(state[i], state_fp);
+ while (state_list) {
+ if (state_list->data) {
+ fputs(state_list->data, state_fp);
fputc('\n', state_fp);
}
- fflush(state_fp);
+ state_list = state_list->link;
}
+ fflush(state_fp);
}
+ /* Cleanup */
if (state_fp != NULL) {
fclose(state_fp);
state_fp = NULL;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 21:28:32 +0000