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-rw-r--r--networking/ifupdown.c199
1 files changed, 100 insertions, 99 deletions
diff --git a/networking/ifupdown.c b/networking/ifupdown.c
index a794bf7..d0d7bfe 100644
--- a/networking/ifupdown.c
+++ b/networking/ifupdown.c
@@ -590,8 +590,8 @@ static char *next_word(char **buf)
/* Skip over leading whitespace */
word = skip_whitespace(*buf);
- /* Stop on EOL/comments */
- if (*word == '#' || *word == '\0')
+ /* Stop on EOL */
+ if (*word == '\0')
return NULL;
/* Find the length of this word (can't be 0) */
@@ -652,40 +652,67 @@ static const llist_t *find_list_string(const llist_t *list, const char *string)
static struct interfaces_file_t *read_interfaces(const char *filename)
{
+ /* Let's try to be compatible.
+ *
+ * "man 5 interfaces" says:
+ * Lines starting with "#" are ignored. Note that end-of-line
+ * comments are NOT supported, comments must be on a line of their own.
+ * A line may be extended across multiple lines by making
+ * the last character a backslash.
+ *
+ * Seen elsewhere in example config file:
+ * A "#" character in the very first column makes the rest of the line
+ * be ignored. Blank lines are ignored. Lines may be indented freely.
+ * A "\" character at the very end of the line indicates the next line
+ * should be treated as a continuation of the current one.
+ */
#if ENABLE_FEATURE_IFUPDOWN_MAPPING
struct mapping_defn_t *currmap = NULL;
#endif
struct interface_defn_t *currif = NULL;
struct interfaces_file_t *defn;
FILE *f;
- char *firstword;
char *buf;
-
+ char *first_word;
+ char *rest_of_line;
enum { NONE, IFACE, MAPPING } currently_processing = NONE;
- defn = xzalloc(sizeof(struct interfaces_file_t));
-
+ defn = xzalloc(sizeof(*defn));
f = xfopen(filename, "r");
while ((buf = xmalloc_getline(f)) != NULL) {
- char *buf_ptr = buf;
-
- firstword = next_word(&buf_ptr);
- if (firstword == NULL) {
+#if ENABLE_DESKTOP
+ /* Trailing "\" concatenates lines */
+ char *p;
+ while ((p = last_char_is(buf, '\\')) != NULL) {
+ *p = '\0';
+ rest_of_line = xmalloc_getline(f);
+ if (!rest_of_line)
+ break;
+ p = xasprintf("%s%s", buf, rest_of_line);
+ free(buf);
+ free(rest_of_line);
+ buf = p;
+ }
+#endif
+ rest_of_line = buf;
+ first_word = next_word(&rest_of_line);
+ if (!first_word || *buf == '#') {
free(buf);
- continue; /* blank line */
+ continue; /* blank/comment line */
}
- if (strcmp(firstword, "mapping") == 0) {
+ if (strcmp(first_word, "mapping") == 0) {
#if ENABLE_FEATURE_IFUPDOWN_MAPPING
currmap = xzalloc(sizeof(*currmap));
- while ((firstword = next_word(&buf_ptr)) != NULL) {
+ while ((first_word = next_word(&rest_of_line)) != NULL) {
if (currmap->n_matches >= currmap->max_matches) {
currmap->max_matches = currmap->max_matches * 2 + 1;
- currmap->match = xrealloc(currmap->match, sizeof(*currmap->match) * currmap->max_matches);
+ currmap->match = xrealloc(currmap->match,
+ sizeof(*currmap->match) * currmap->max_matches);
}
- currmap->match[currmap->n_matches++] = xstrdup(firstword);
+ currmap->match[currmap->n_matches++] = xstrdup(first_word);
}
/*currmap->max_mappings = 0; - done by xzalloc */
/*currmap->n_mappings = 0;*/
@@ -702,7 +729,7 @@ static struct interfaces_file_t *read_interfaces(const char *filename)
debug_noise("Added mapping\n");
#endif
currently_processing = MAPPING;
- } else if (strcmp(firstword, "iface") == 0) {
+ } else if (strcmp(first_word, "iface") == 0) {
static const struct address_family_t *const addr_fams[] = {
#if ENABLE_FEATURE_IFUPDOWN_IPV4
&addr_inet,
@@ -712,24 +739,23 @@ static struct interfaces_file_t *read_interfaces(const char *filename)
#endif
NULL
};
-
char *iface_name;
char *address_family_name;
char *method_name;
llist_t *iface_list;
currif = xzalloc(sizeof(*currif));
- iface_name = next_word(&buf_ptr);
- address_family_name = next_word(&buf_ptr);
- method_name = next_word(&buf_ptr);
+ iface_name = next_word(&rest_of_line);
+ address_family_name = next_word(&rest_of_line);
+ method_name = next_word(&rest_of_line);
if (method_name == NULL)
bb_error_msg_and_die("too few parameters for line \"%s\"", buf);
/* ship any trailing whitespace */
- buf_ptr = skip_whitespace(buf_ptr);
+ rest_of_line = skip_whitespace(rest_of_line);
- if (buf_ptr[0] != '\0' /* && buf_ptr[0] != '#' */)
+ if (rest_of_line[0] != '\0' /* && rest_of_line[0] != '#' */)
bb_error_msg_and_die("too many parameters \"%s\"", buf);
currif->iface = xstrdup(iface_name);
@@ -754,57 +780,59 @@ static struct interfaces_file_t *read_interfaces(const char *filename)
debug_noise("iface %s %s %s\n", currif->iface, address_family_name, method_name);
currently_processing = IFACE;
- } else if (strcmp(firstword, "auto") == 0) {
- while ((firstword = next_word(&buf_ptr)) != NULL) {
+ } else if (strcmp(first_word, "auto") == 0) {
+ while ((first_word = next_word(&rest_of_line)) != NULL) {
/* Check the interface isnt already listed */
- if (find_list_string(defn->autointerfaces, firstword)) {
+ if (find_list_string(defn->autointerfaces, first_word)) {
bb_perror_msg_and_die("interface declared auto twice \"%s\"", buf);
}
/* Add the interface to the list */
- llist_add_to_end(&(defn->autointerfaces), xstrdup(firstword));
- debug_noise("\nauto %s\n", firstword);
+ llist_add_to_end(&(defn->autointerfaces), xstrdup(first_word));
+ debug_noise("\nauto %s\n", first_word);
}
currently_processing = NONE;
} else {
switch (currently_processing) {
case IFACE:
- if (buf_ptr[0] == '\0')
+ if (rest_of_line[0] == '\0')
bb_error_msg_and_die("option with empty value \"%s\"", buf);
- if (strcmp(firstword, "up") != 0
- && strcmp(firstword, "down") != 0
- && strcmp(firstword, "pre-up") != 0
- && strcmp(firstword, "post-down") != 0
+ if (strcmp(first_word, "up") != 0
+ && strcmp(first_word, "down") != 0
+ && strcmp(first_word, "pre-up") != 0
+ && strcmp(first_word, "post-down") != 0
) {
int i;
for (i = 0; i < currif->n_options; i++) {
- if (strcmp(currif->option[i].name, firstword) == 0)
+ if (strcmp(currif->option[i].name, first_word) == 0)
bb_error_msg_and_die("duplicate option \"%s\"", buf);
}
}
if (currif->n_options >= currif->max_options) {
currif->max_options += 10;
- currif->option = xrealloc(currif->option, sizeof(*currif->option) * currif->max_options);
+ currif->option = xrealloc(currif->option,
+ sizeof(*currif->option) * currif->max_options);
}
- debug_noise("\t%s=%s\n", firstword, buf_ptr);
- currif->option[currif->n_options].name = xstrdup(firstword);
- currif->option[currif->n_options].value = xstrdup(buf_ptr);
+ debug_noise("\t%s=%s\n", first_word, rest_of_line);
+ currif->option[currif->n_options].name = xstrdup(first_word);
+ currif->option[currif->n_options].value = xstrdup(rest_of_line);
currif->n_options++;
break;
case MAPPING:
#if ENABLE_FEATURE_IFUPDOWN_MAPPING
- if (strcmp(firstword, "script") == 0) {
+ if (strcmp(first_word, "script") == 0) {
if (currmap->script != NULL)
bb_error_msg_and_die("duplicate script in mapping \"%s\"", buf);
- currmap->script = xstrdup(next_word(&buf_ptr));
- } else if (strcmp(firstword, "map") == 0) {
+ currmap->script = xstrdup(next_word(&rest_of_line));
+ } else if (strcmp(first_word, "map") == 0) {
if (currmap->n_mappings >= currmap->max_mappings) {
currmap->max_mappings = currmap->max_mappings * 2 + 1;
- currmap->mapping = xrealloc(currmap->mapping, sizeof(char *) * currmap->max_mappings);
+ currmap->mapping = xrealloc(currmap->mapping,
+ sizeof(char *) * currmap->max_mappings);
}
- currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&buf_ptr));
+ currmap->mapping[currmap->n_mappings] = xstrdup(next_word(&rest_of_line));
currmap->n_mappings++;
} else {
bb_error_msg_and_die("misplaced option \"%s\"", buf);
@@ -817,7 +845,8 @@ static struct interfaces_file_t *read_interfaces(const char *filename)
}
}
free(buf);
- }
+ } /* while (fgets) */
+
if (ferror(f) != 0) {
/* ferror does NOT set errno! */
bb_error_msg_and_die("%s: I/O error", filename);
@@ -955,60 +984,39 @@ static int iface_down(struct interface_defn_t *iface)
}
#if ENABLE_FEATURE_IFUPDOWN_MAPPING
-static int popen2(FILE **in, FILE **out, char *command, ...)
+static int popen2(FILE **in, FILE **out, char *command, char *param)
{
- va_list ap;
- char *argv[11] = { command };
- int argc;
+ char *argv[3] = { command, param, NULL };
int infd[2], outfd[2];
pid_t pid;
- argc = 1;
- va_start(ap, command);
- while ((argc < 10) && (argv[argc] = va_arg(ap, char *))) {
- argc++;
- }
- argv[argc] = NULL; /* make sure */
- va_end(ap);
-
- if (pipe(infd) != 0) {
- return 0;
- }
-
- if (pipe(outfd) != 0) {
- close(infd[0]);
- close(infd[1]);
- return 0;
- }
+ xpipe(infd);
+ xpipe(outfd);
fflush(NULL);
- switch (pid = fork()) {
- case -1: /* failure */
- close(infd[0]);
- close(infd[1]);
- close(outfd[0]);
- close(outfd[1]);
- return 0;
- case 0: /* child */
- dup2(infd[0], 0);
- dup2(outfd[1], 1);
- close(infd[0]);
+ pid = fork();
+
+ switch (pid) {
+ case -1: /* failure */
+ bb_perror_msg_and_die("fork");
+ case 0: /* child */
+ /* NB: close _first_, then move fds! */
close(infd[1]);
close(outfd[0]);
- close(outfd[1]);
+ xmove_fd(infd[0], 0);
+ xmove_fd(outfd[1], 1);
BB_EXECVP(command, argv);
- exit(127);
- default: /* parent */
- *in = fdopen(infd[1], "w");
- *out = fdopen(outfd[0], "r");
- close(infd[0]);
- close(outfd[1]);
- return pid;
+ _exit(127);
}
- /* unreached */
+ /* parent */
+ close(infd[0]);
+ close(outfd[1]);
+ *in = fdopen(infd[1], "w");
+ *out = fdopen(outfd[0], "r");
+ return pid;
}
-static char *run_mapping(char *physical, struct mapping_defn_t * map)
+static char *run_mapping(char *physical, struct mapping_defn_t *map)
{
FILE *in, *out;
int i, status;
@@ -1016,12 +1024,8 @@ static char *run_mapping(char *physical, struct mapping_defn_t * map)
char *logical = xstrdup(physical);
- /* Run the mapping script. */
- pid = popen2(&in, &out, map->script, physical, NULL);
-
- /* popen2() returns 0 on failure. */
- if (pid == 0)
- return logical;
+ /* Run the mapping script. Never fails. */
+ pid = popen2(&in, &out, map->script, physical);
/* Write mappings to stdin of mapping script. */
for (i = 0; i < map->n_mappings; i++) {
@@ -1034,9 +1038,9 @@ static char *run_mapping(char *physical, struct mapping_defn_t * map)
/* If the mapping script exited successfully, try to
* grab a line of output and use that as the name of the
* logical interface. */
- char *new_logical = xmalloc(MAX_INTERFACE_LENGTH);
+ char *new_logical = xmalloc_getline(out);
- if (fgets(new_logical, MAX_INTERFACE_LENGTH, out)) {
+ if (new_logical) {
/* If we are able to read a line of output from the script,
* remove any trailing whitespace and use this value
* as the name of the logical interface. */
@@ -1047,10 +1051,6 @@ static char *run_mapping(char *physical, struct mapping_defn_t * map)
free(logical);
logical = new_logical;
- } else {
- /* If we are UNABLE to read a line of output, discard our
- * freshly allocated memory. */
- free(new_logical);
}
}
@@ -1062,12 +1062,13 @@ static char *run_mapping(char *physical, struct mapping_defn_t * map)
static llist_t *find_iface_state(llist_t *state_list, const char *iface)
{
- unsigned short iface_len = strlen(iface);
+ unsigned iface_len = strlen(iface);
llist_t *search = state_list;
while (search) {
if ((strncmp(search->data, iface, iface_len) == 0)
- && (search->data[iface_len] == '=')) {
+ && (search->data[iface_len] == '=')
+ ) {
return search;
}
search = search->link;
generated by cgit v1.1 at 2024-12-28 15:26:24 +0000