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Merge pull request #14675 from yuwata/network-dhcp-accept-nul

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network: accept NUL character in SendOption=
This commit is contained in:
Lennart Poettering 2020-01-28 15:18:16 +01:00 committed by GitHub
commit 4523f1db0f
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 34 additions and 21 deletions
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20
src/basic/escape.c
View File

@ -102,7 +102,7 @@ char *cescape(const char *s) {
return cescape_length(s, strlen(s)); return cescape_length(s, strlen(s));
} }
int cunescape_one(const char *p, size_t length, char32_t *ret, bool *eight_bit) { int cunescape_one(const char *p, size_t length, char32_t *ret, bool *eight_bit, bool accept_nul) {
int r = 1; int r = 1;
assert(p); assert(p);
@ -171,7 +171,7 @@ int cunescape_one(const char *p, size_t length, char32_t *ret, bool *eight_bit)
return -EINVAL; return -EINVAL;
/* Don't allow NUL bytes */ /* Don't allow NUL bytes */
if (a == 0 && b == 0) if (a == 0 && b == 0 && !accept_nul)
return -EINVAL; return -EINVAL;
*ret = (a << 4U) | b; *ret = (a << 4U) | b;
@ -199,7 +199,7 @@ int cunescape_one(const char *p, size_t length, char32_t *ret, bool *eight_bit)
c = ((uint32_t) a[0] << 12U) | ((uint32_t) a[1] << 8U) | ((uint32_t) a[2] << 4U) | (uint32_t) a[3]; c = ((uint32_t) a[0] << 12U) | ((uint32_t) a[1] << 8U) | ((uint32_t) a[2] << 4U) | (uint32_t) a[3];
/* Don't allow 0 chars */ /* Don't allow 0 chars */
if (c == 0) if (c == 0 && !accept_nul)
return -EINVAL; return -EINVAL;
*ret = c; *ret = c;
@ -227,7 +227,7 @@ int cunescape_one(const char *p, size_t length, char32_t *ret, bool *eight_bit)
((uint32_t) a[4] << 12U) | ((uint32_t) a[5] << 8U) | ((uint32_t) a[6] << 4U) | (uint32_t) a[7]; ((uint32_t) a[4] << 12U) | ((uint32_t) a[5] << 8U) | ((uint32_t) a[6] << 4U) | (uint32_t) a[7];
/* Don't allow 0 chars */ /* Don't allow 0 chars */
if (c == 0) if (c == 0 && !accept_nul)
return -EINVAL; return -EINVAL;
/* Don't allow invalid code points */ /* Don't allow invalid code points */
@ -267,7 +267,7 @@ int cunescape_one(const char *p, size_t length, char32_t *ret, bool *eight_bit)
return -EINVAL; return -EINVAL;
/* don't allow NUL bytes */ /* don't allow NUL bytes */
if (a == 0 && b == 0 && c == 0) if (a == 0 && b == 0 && c == 0 && !accept_nul)
return -EINVAL; return -EINVAL;
/* Don't allow bytes above 255 */ /* Don't allow bytes above 255 */
@ -333,7 +333,7 @@ int cunescape_length_with_prefix(const char *s, size_t length, const char *prefi
return -EINVAL; return -EINVAL;
} }
k = cunescape_one(f + 1, remaining - 1, &u, &eight_bit); k = cunescape_one(f + 1, remaining - 1, &u, &eight_bit, flags & UNESCAPE_ACCEPT_NUL);
if (k < 0) { if (k < 0) {
if (flags & UNESCAPE_RELAX) { if (flags & UNESCAPE_RELAX) {
/* Invalid escape code, let's take it literal then */ /* Invalid escape code, let's take it literal then */
@ -360,14 +360,6 @@ int cunescape_length_with_prefix(const char *s, size_t length, const char *prefi
return t - r; return t - r;
} }
int cunescape_length(const char *s, size_t length, UnescapeFlags flags, char **ret) {
return cunescape_length_with_prefix(s, length, NULL, flags, ret);
}
int cunescape(const char *s, UnescapeFlags flags, char **ret) {
return cunescape_length(s, strlen(s), flags, ret);
}
char *xescape_full(const char *s, const char *bad, size_t console_width, bool eight_bits) { char *xescape_full(const char *s, const char *bad, size_t console_width, bool eight_bits) {
char *ans, *t, *prev, *prev2; char *ans, *t, *prev, *prev2;
const char *f; const char *f;

15
src/basic/escape.h
View File

@ -29,22 +29,27 @@
#define SHELL_NEED_ESCAPE_POSIX "\\\'" #define SHELL_NEED_ESCAPE_POSIX "\\\'"
typedef enum UnescapeFlags { typedef enum UnescapeFlags {
UNESCAPE_RELAX = 1, UNESCAPE_RELAX = 1 << 0,
UNESCAPE_ACCEPT_NUL = 1 << 1,
} UnescapeFlags; } UnescapeFlags;
typedef enum EscapeStyle { typedef enum EscapeStyle {
ESCAPE_BACKSLASH = 1, ESCAPE_BACKSLASH = 1,
ESCAPE_POSIX = 2, ESCAPE_POSIX = 2,
} EscapeStyle; } EscapeStyle;
char *cescape(const char *s); char *cescape(const char *s);
char *cescape_length(const char *s, size_t n); char *cescape_length(const char *s, size_t n);
int cescape_char(char c, char *buf); int cescape_char(char c, char *buf);
int cunescape(const char *s, UnescapeFlags flags, char **ret);
int cunescape_length(const char *s, size_t length, UnescapeFlags flags, char **ret);
int cunescape_length_with_prefix(const char *s, size_t length, const char *prefix, UnescapeFlags flags, char **ret); int cunescape_length_with_prefix(const char *s, size_t length, const char *prefix, UnescapeFlags flags, char **ret);
int cunescape_one(const char *p, size_t length, char32_t *ret, bool *eight_bit); static inline int cunescape_length(const char *s, size_t length, UnescapeFlags flags, char **ret) {
return cunescape_length_with_prefix(s, length, NULL, flags, ret);
}
static inline int cunescape(const char *s, UnescapeFlags flags, char **ret) {
return cunescape_length(s, strlen(s), flags, ret);
}
int cunescape_one(const char *p, size_t length, char32_t *ret, bool *eight_bit, bool accept_nul);
char *xescape_full(const char *s, const char *bad, size_t console_width, bool eight_bits); char *xescape_full(const char *s, const char *bad, size_t console_width, bool eight_bits);
static inline char *xescape(const char *s, const char *bad) { static inline char *xescape(const char *s, const char *bad) {

2
src/basic/extract-word.c
View File

@ -90,7 +90,7 @@ int extract_first_word(const char **p, char **ret, const char *separators, Extra
bool eight_bit = false; bool eight_bit = false;
char32_t u; char32_t u;
r = cunescape_one(*p, (size_t) -1, &u, &eight_bit); r = cunescape_one(*p, (size_t) -1, &u, &eight_bit, false);
if (r < 0) { if (r < 0) {
if (flags & EXTRACT_CUNESCAPE_RELAX) { if (flags & EXTRACT_CUNESCAPE_RELAX) {
s[sz++] = '\\'; s[sz++] = '\\';

2
src/network/networkd-dhcp-common.c
View File

@ -390,7 +390,7 @@ int config_parse_dhcp_send_option(
break; break;
} }
case DHCP_OPTION_DATA_STRING: case DHCP_OPTION_DATA_STRING:
sz = cunescape(p, 0, &q); sz = cunescape(p, UNESCAPE_ACCEPT_NUL, &q);
if (sz < 0) { if (sz < 0) {
log_syntax(unit, LOG_ERR, filename, line, sz, log_syntax(unit, LOG_ERR, filename, line, sz,
"Failed to decode DHCPv4 option data, ignoring assignment: %s", p); "Failed to decode DHCPv4 option data, ignoring assignment: %s", p);

16
src/test/test-escape.c
View File

@ -96,6 +96,22 @@ static void test_cunescape(void) {
assert_se(cunescape("A=A\\\\x0aB", UNESCAPE_RELAX, &unescaped) >= 0); assert_se(cunescape("A=A\\\\x0aB", UNESCAPE_RELAX, &unescaped) >= 0);
assert_se(streq_ptr(unescaped, "A=A\\x0aB")); assert_se(streq_ptr(unescaped, "A=A\\x0aB"));
unescaped = mfree(unescaped);
assert_se(cunescape("\\x00\\x00\\x00", UNESCAPE_ACCEPT_NUL, &unescaped) == 3);
assert_se(memcmp(unescaped, "\0\0\0", 3) == 0);
unescaped = mfree(unescaped);
assert_se(cunescape("\\u0000\\u0000\\u0000", UNESCAPE_ACCEPT_NUL, &unescaped) == 3);
assert_se(memcmp(unescaped, "\0\0\0", 3) == 0);
unescaped = mfree(unescaped);
assert_se(cunescape("\\U00000000\\U00000000\\U00000000", UNESCAPE_ACCEPT_NUL, &unescaped) == 3);
assert_se(memcmp(unescaped, "\0\0\0", 3) == 0);
unescaped = mfree(unescaped);
assert_se(cunescape("\\000\\000\\000", UNESCAPE_ACCEPT_NUL, &unescaped) == 3);
assert_se(memcmp(unescaped, "\0\0\0", 3) == 0);
} }
static void test_shell_escape_one(const char *s, const char *bad, const char *expected) { static void test_shell_escape_one(const char *s, const char *bad, const char *expected) {