/* End of name */
break;
else if (c <= 63) {
- _cleanup_free_ char *t = NULL;
const char *label;
/* Literal label */
if (pos > optlen)
return -EMSGSIZE;
- r = dns_label_escape(label, c, &t);
- if (r < 0)
- goto fail;
-
- if (!GREEDY_REALLOC0(ret, allocated, n + !first + strlen(t) + 1)) {
+ if (!GREEDY_REALLOC(ret, allocated, n + !first + DNS_LABEL_ESCAPED_MAX)) {
r = -ENOMEM;
goto fail;
}
- if (!first)
- ret[n++] = '.';
- else
+ if (first)
first = false;
+ else
+ ret[n++] = '.';
+
+ r = dns_label_escape(label, c, ret + n, DNS_LABEL_ESCAPED_MAX);
+ if (r < 0)
+ goto fail;
- memcpy(ret + n, t, r);
n += r;
continue;
} else {
/* End of name */
break;
else if (c <= 63) {
- _cleanup_free_ char *t = NULL;
const char *label;
/* Literal label */
if (r < 0)
goto fail;
- r = dns_label_escape(label, c, &t);
- if (r < 0)
- goto fail;
-
- if (!GREEDY_REALLOC(ret, allocated, n + !first + strlen(t) + 1)) {
+ if (!GREEDY_REALLOC(ret, allocated, n + !first + DNS_LABEL_ESCAPED_MAX)) {
r = -ENOMEM;
goto fail;
}
- if (!first)
- ret[n++] = '.';
- else
+ if (first)
first = false;
+ else
+ ret[n++] = '.';
+
+ r = dns_label_escape(label, c, ret + n, DNS_LABEL_ESCAPED_MAX);
+ if (r < 0)
+ goto fail;
- memcpy(ret + n, t, r);
n += r;
continue;
} else if (allow_compression && (c & 0xc0) == 0xc0) {
return r;
}
-int dns_label_escape(const char *p, size_t l, char **ret) {
- _cleanup_free_ char *s = NULL;
+int dns_label_escape(const char *p, size_t l, char *dest, size_t sz) {
char *q;
- int r;
-
- assert(p);
- assert(ret);
if (l > DNS_LABEL_MAX)
return -EINVAL;
+ if (sz < 1)
+ return -ENOSPC;
- s = malloc(l * 4 + 1);
- if (!s)
- return -ENOMEM;
+ assert(p);
+ assert(dest);
- q = s;
+ q = dest;
while (l > 0) {
if (*p == '.' || *p == '\\') {
+ if (sz < 3)
+ return -ENOSPC;
+
/* Dot or backslash */
*(q++) = '\\';
*(q++) = *p;
+ sz -= 2;
+
} else if (*p == '_' ||
*p == '-' ||
(*p >= '0' && *p <= '9') ||
(*p >= 'A' && *p <= 'Z')) {
/* Proper character */
+
+ if (sz < 2)
+ return -ENOSPC;
+
*(q++) = *p;
+ sz -= 1;
+
} else if ((uint8_t) *p >= (uint8_t) ' ' && *p != 127) {
/* Everything else */
+
+ if (sz < 5)
+ return -ENOSPC;
+
*(q++) = '\\';
*(q++) = '0' + (char) ((uint8_t) *p / 100);
*(q++) = '0' + (char) (((uint8_t) *p / 10) % 10);
*(q++) = '0' + (char) ((uint8_t) *p % 10);
+ sz -= 4;
+
} else
return -EINVAL;
}
*q = 0;
+ return (int) (q - dest);
+}
+
+int dns_label_escape_new(const char *p, size_t l, char **ret) {
+ _cleanup_free_ char *s = NULL;
+ int r;
+
+ assert(p);
+ assert(ret);
+
+ if (l > DNS_LABEL_MAX)
+ return -EINVAL;
+
+ s = new(char, DNS_LABEL_ESCAPED_MAX);
+ if (!s)
+ return -ENOMEM;
+
+ r = dns_label_escape(p, l, s, DNS_LABEL_ESCAPED_MAX);
+ if (r < 0)
+ return r;
+
*ret = s;
- r = q - s;
s = NULL;
return r;
if (k > 0)
r = k;
- r = dns_label_escape(label, r, &t);
- if (r < 0)
- return r;
-
if (_ret) {
- if (!GREEDY_REALLOC(ret, allocated, n + !first + strlen(t) + 1))
+ if (!GREEDY_REALLOC(ret, allocated, n + !first + DNS_LABEL_ESCAPED_MAX))
return -ENOMEM;
+ r = dns_label_escape(label, r, ret + n + !first, DNS_LABEL_ESCAPED_MAX);
+ if (r < 0)
+ return r;
+
if (!first)
- ret[n++] = '.';
- else
- first = false;
+ ret[n] = '.';
+ } else {
+ char escaped[DNS_LABEL_ESCAPED_MAX];
- memcpy(ret + n, t, r);
+ r = dns_label_escape(label, r, escaped, sizeof(escaped));
+ if (r < 0)
+ return r;
}
+ if (!first)
+ n++;
+ else
+ first = false;
+
n += r;
}
- if (n > DNS_NAME_MAX)
- return -EINVAL;
-
if (_ret) {
if (!GREEDY_REALLOC(ret, allocated, n + 1))
return -ENOMEM;
}
int dns_service_join(const char *name, const char *type, const char *domain, char **ret) {
- _cleanup_free_ char *escaped = NULL, *n = NULL;
+ char escaped[DNS_LABEL_ESCAPED_MAX];
+ _cleanup_free_ char *n = NULL;
int r;
assert(type);
if (!dns_service_name_is_valid(name))
return -EINVAL;
- r = dns_label_escape(name, strlen(name), &escaped);
+ r = dns_label_escape(name, strlen(name), escaped, sizeof(escaped));
if (r < 0)
return r;
#include "in-addr-util.h"
#define DNS_LABEL_MAX 63
-#define DNS_NAME_MAX 255
+#define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1)
int dns_label_unescape(const char **name, char *dest, size_t sz);
int dns_label_unescape_suffix(const char *name, const char **label_end, char *dest, size_t sz);
-int dns_label_escape(const char *p, size_t l, char **ret);
+int dns_label_escape(const char *p, size_t l, char *dest, size_t sz);
+int dns_label_escape_new(const char *p, size_t l, char **ret);
int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max);
int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max);