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Merge pull request #1348 from libgit2/signatures-2

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Simplify signature parsing
This commit is contained in:
Russell Belfer 2013-02-20 10:19:58 -08:00
commit f7511c2c69
4 changed files with 88 additions and 211 deletions
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260
src/signature.c
View File

@ -22,62 +22,28 @@ void git_signature_free(git_signature *sig)
git__free(sig);
}
static const char *skip_leading_spaces(const char *buffer, const char *buffer_end)
{
while (*buffer == ' ' && buffer < buffer_end)
buffer++;
return buffer;
}
static const char *skip_trailing_spaces(const char *buffer_start, const char *buffer_end)
{
while (*buffer_end == ' ' && buffer_end > buffer_start)
buffer_end--;
return buffer_end;
}
static int signature_error(const char *msg)
{
giterr_set(GITERR_INVALID, "Failed to process signature - %s", msg);
giterr_set(GITERR_INVALID, "Failed to parse signature - %s", msg);
return -1;
}
static int process_trimming(const char *input, char **storage, const char *input_end, int fail_when_empty)
{
const char *left, *right;
size_t trimmed_input_length;
assert(storage);
left = skip_leading_spaces(input, input_end);
right = skip_trailing_spaces(input, input_end - 1);
if (right < left) {
if (fail_when_empty)
return signature_error("input is either empty of contains only spaces");
right = left - 1;
}
trimmed_input_length = right - left + 1;
*storage = git__malloc(trimmed_input_length + 1);
GITERR_CHECK_ALLOC(*storage);
memcpy(*storage, left, trimmed_input_length);
(*storage)[trimmed_input_length] = 0;
return 0;
}
static bool contains_angle_brackets(const char *input)
{
if (strchr(input, '<') != NULL)
return true;
return strchr(input, '<') != NULL || strchr(input, '>') != NULL;
}
return strchr(input, '>') != NULL;
static char *extract_trimmed(const char *ptr, size_t len)
{
while (len && ptr[0] == ' ') {
ptr++; len--;
}
while (len && ptr[len - 1] == ' ') {
len--;
}
return git__substrdup(ptr, len);
}
int git_signature_new(git_signature **sig_out, const char *name, const char *email, git_time_t time, int offset)
@ -88,28 +54,28 @@ int git_signature_new(git_signature **sig_out, const char *name, const char *ema
*sig_out = NULL;
if (contains_angle_brackets(name) ||
contains_angle_brackets(email)) {
return signature_error(
"Neither `name` nor `email` should contain angle brackets chars.");
}
p = git__calloc(1, sizeof(git_signature));
GITERR_CHECK_ALLOC(p);
if (process_trimming(name, &p->name, name + strlen(name), 1) < 0 ||
process_trimming(email, &p->email, email + strlen(email), 1) < 0)
{
p->name = extract_trimmed(name, strlen(name));
p->email = extract_trimmed(email, strlen(email));
if (p->name == NULL || p->email == NULL ||
p->name[0] == '\0' || p->email[0] == '\0') {
git_signature_free(p);
return -1;
}
if (contains_angle_brackets(p->email) ||
contains_angle_brackets(p->name))
{
git_signature_free(p);
return signature_error("Neither `name` nor `email` should contain angle brackets chars.");
}
p->when.time = time;
p->when.offset = offset;
*sig_out = p;
return 0;
}
@ -153,169 +119,71 @@ int git_signature_now(git_signature **sig_out, const char *name, const char *ema
return 0;
}
static int timezone_error(const char *msg)
{
giterr_set(GITERR_INVALID, "Failed to parse TZ offset - %s", msg);
return -1;
}
static int parse_timezone_offset(const char *buffer, int *offset_out)
{
int dec_offset;
int mins, hours, offset;
const char *offset_start;
const char *offset_end;
offset_start = buffer;
if (*offset_start == '\n') {
*offset_out = 0;
return 0;
}
if (offset_start[0] != '-' && offset_start[0] != '+')
return timezone_error("does not start with '+' or '-'");
if (offset_start[1] < '0' || offset_start[1] > '9')
return timezone_error("expected initial digit");
if (git__strtol32(&dec_offset, offset_start + 1, &offset_end, 10) < 0)
return timezone_error("not a valid number");
if (offset_end - offset_start != 5)
return timezone_error("invalid length");
if (dec_offset > 1400)
return timezone_error("value too large");
hours = dec_offset / 100;
mins = dec_offset % 100;
if (hours > 14) // see http://www.worldtimezone.com/faq.html
return timezone_error("hour value too large");
if (mins > 59)
return timezone_error("minutes value too large");
offset = (hours * 60) + mins;
if (offset_start[0] == '-')
offset *= -1;
*offset_out = offset;
return 0;
}
static int process_next_token(const char **buffer_out, char **storage,
const char *token_end, const char *right_boundary)
{
int error = process_trimming(*buffer_out, storage, token_end, 0);
if (error < 0)
return error;
*buffer_out = token_end + 1;
if (*buffer_out > right_boundary)
return signature_error("signature is too short");
return 0;
}
static const char *scan_for_previous_token(const char *buffer, const char *left_boundary)
{
const char *start;
if (buffer <= left_boundary)
return NULL;
start = skip_trailing_spaces(left_boundary, buffer);
/* Search for previous occurence of space */
while (start[-1] != ' ' && start > left_boundary)
start--;
return start;
}
static int parse_time(git_time_t *time_out, const char *buffer)
{
int error;
int64_t time;
if (*buffer == '+' || *buffer == '-') {
giterr_set(GITERR_INVALID, "Failed while parsing time. '%s' actually looks like a timezone offset.", buffer);
return -1;
}
error = git__strtol64(&time, buffer, &buffer, 10);
if (!error)
*time_out = (git_time_t)time;
return error;
}
int git_signature__parse(git_signature *sig, const char **buffer_out,
const char *buffer_end, const char *header, char ender)
{
const char *buffer = *buffer_out;
const char *line_end, *name_end, *email_end, *tz_start, *time_start;
int error = 0;
const char *email_start, *email_end;
memset(sig, 0, sizeof(git_signature));
if ((line_end = memchr(buffer, ender, buffer_end - buffer)) == NULL)
if ((buffer_end = memchr(buffer, ender, buffer_end - buffer)) == NULL)
return signature_error("no newline given");
if (header) {
const size_t header_len = strlen(header);
if (memcmp(buffer, header, header_len) != 0)
if (buffer + header_len >= buffer_end || memcmp(buffer, header, header_len) != 0)
return signature_error("expected prefix doesn't match actual");
buffer += header_len;
}
if (buffer > line_end)
return signature_error("signature too short");
email_start = git__memrchr(buffer, '<', buffer_end - buffer);
email_end = git__memrchr(buffer, '>', buffer_end - buffer);
if ((name_end = strchr(buffer, '<')) == NULL)
return signature_error("character '<' not allowed in signature");
if ((email_end = strchr(name_end, '>')) == NULL)
return signature_error("character '>' not allowed in signature");
if (email_end < name_end)
if (!email_start || !email_end || email_end <= email_start)
return signature_error("malformed e-mail");
error = process_next_token(&buffer, &sig->name, name_end, line_end);
if (error < 0)
return error;
email_start += 1;
sig->name = extract_trimmed(buffer, email_start - buffer - 1);
sig->email = extract_trimmed(email_start, email_end - email_start);
error = process_next_token(&buffer, &sig->email, email_end, line_end);
if (error < 0)
return error;
/* Do we even have a time at the end of the signature? */
if (email_end + 2 < buffer_end) {
const char *time_start = email_end + 2;
const char *time_end;
tz_start = scan_for_previous_token(line_end - 1, buffer);
if (git__strtol64(&sig->when.time, time_start, &time_end, 10) < 0)
return signature_error("invalid Unix timestamp");
if (tz_start == NULL)
goto clean_exit; /* No timezone nor date */
/* do we have a timezone? */
if (time_end + 1 < buffer_end) {
int offset, hours, mins;
const char *tz_start, *tz_end;
time_start = scan_for_previous_token(tz_start - 1, buffer);
if (time_start == NULL || parse_time(&sig->when.time, time_start) < 0) {
/* The tz_start might point at the time */
parse_time(&sig->when.time, tz_start);
goto clean_exit;
tz_start = time_end + 1;
if ((tz_start[0] != '-' && tz_start[0] != '+') ||
git__strtol32(&offset, tz_start + 1, &tz_end, 10) < 0)
return signature_error("malformed timezone");
hours = offset / 100;
mins = offset % 100;
/*
* only store timezone if it's not overflowing;
* see http://www.worldtimezone.com/faq.html
*/
if (hours < 14 && mins < 59) {
sig->when.offset = (hours * 60) + mins;
if (tz_start[0] == '-')
sig->when.offset = -sig->when.offset;
}
}
}
if (parse_timezone_offset(tz_start, &sig->when.offset) < 0) {
sig->when.time = 0; /* Bogus timezone, we reset the time */
}
clean_exit:
*buffer_out = line_end + 1;
*buffer_out = buffer_end + 1;
return 0;
}

15
src/util.h
View File

@ -127,6 +127,21 @@ GIT_INLINE(const char *) git__next_line(const char *s)
return s;
}
GIT_INLINE(const void *) git__memrchr(const void *s, int c, size_t n)
{
const unsigned char *cp;
if (n != 0) {
cp = (unsigned char *)s + n;
do {
if (*(--cp) == (unsigned char)c)
return cp;
} while (--n != 0);
}
return NULL;
}
typedef int (*git__tsort_cmp)(const void *a, const void *b);
extern void git__tsort(void **dst, size_t size, git__tsort_cmp cmp);

20
tests-clar/commit/parse.c
View File

@ -108,19 +108,12 @@ passing_signature_test_case passing_signature_cases[] = {
// Parse an obviously invalid signature
{"committer foo<@bar> 123456 -0100 \n", "committer ", "foo", "@bar", 123456, -60},
// Parse an obviously invalid signature
{"committer foo<@bar>123456 -0100 \n", "committer ", "foo", "@bar", 123456, -60},
{"committer foo<@bar> 123456 -0100 \n", "committer ", "foo", "@bar", 123456, -60},
// Parse an obviously invalid signature
{"committer <>\n", "committer ", "", "", 0, 0},
{"committer Vicent Marti <tanoku@gmail.com> 123456 -1500 \n", "committer ", "Vicent Marti", "tanoku@gmail.com", 0, 0},
{"committer Vicent Marti <tanoku@gmail.com> 123456 +0163 \n", "committer ", "Vicent Marti", "tanoku@gmail.com", 0, 0},
{"author Vicent Marti <tanoku@gmail.com> notime \n", "author ", "Vicent Marti", "tanoku@gmail.com", 0, 0},
{"author Vicent Marti <tanoku@gmail.com> 123456 notimezone \n", "author ", "Vicent Marti", "tanoku@gmail.com", 0, 0},
{"author Vicent Marti <tanoku@gmail.com> notime +0100\n", "author ", "Vicent Marti", "tanoku@gmail.com", 0, 0},
{"committer Vicent Marti <tanoku@gmail.com> 123456 -1500 \n", "committer ", "Vicent Marti", "tanoku@gmail.com", 123456, 0},
{"committer Vicent Marti <tanoku@gmail.com> 123456 +0163 \n", "committer ", "Vicent Marti", "tanoku@gmail.com", 123456, 0},
{"author Vicent Marti <tanoku@gmail.com>\n", "author ", "Vicent Marti", "tanoku@gmail.com", 0, 0},
{"author A U Thor <author@example.com>, C O. Miter <comiter@example.com> 1234567890 -0700\n", "author ", "A U Thor", "author@example.com", 1234567890, -420},
{"author A U Thor <author@example.com> and others 1234567890 -0700\n", "author ", "A U Thor", "author@example.com", 1234567890, -420},
{"author A U Thor <author@example.com> and others 1234567890\n", "author ", "A U Thor", "author@example.com", 1234567890, 0},
{"author A U Thor> <author@example.com> and others 1234567890\n", "author ", "A U Thor>", "author@example.com", 1234567890, 0},
/* a variety of dates */
{"author Vicent Marti <tanoku@gmail.com> 0 \n", "author ", "Vicent Marti", "tanoku@gmail.com", 0, 0},
{"author Vicent Marti <tanoku@gmail.com> 1234567890 \n", "author ", "Vicent Marti", "tanoku@gmail.com", 1234567890, 0},
@ -145,7 +138,7 @@ failing_signature_test_case failing_signature_cases[] = {
{"author Vicent Marti <broken@email 12345 \n", "author "},
{"committer Vicent Marti ><\n", "committer "},
{"author ", "author "},
{NULL,NULL,}
{NULL, NULL,}
};
void test_commit_parse__signature(void)
@ -158,11 +151,12 @@ void test_commit_parse__signature(void)
const char *str = passcase->string;
size_t len = strlen(passcase->string);
struct git_signature person = {0};
cl_git_pass(git_signature__parse(&person, &str, str + len, passcase->header, '\n'));
cl_assert_equal_s(passcase->name, person.name);
cl_assert_equal_s(passcase->email, person.email);
cl_assert(passcase->time == person.when.time);
cl_assert(passcase->offset == person.when.offset);
cl_assert_equal_i(passcase->time, person.when.time);
cl_assert_equal_i(passcase->offset, person.when.offset);
git__free(person.name); git__free(person.email);
}

4
tests-clar/revwalk/signatureparsing.c
View File

@ -37,8 +37,8 @@ void test_revwalk_signatureparsing__do_not_choke_when_name_contains_angle_bracke
cl_git_pass(git_commit_lookup(&commit, _repo, git_reference_target(ref)));
signature = git_commit_committer(commit);
cl_assert_equal_s("Yu V. Bin Haacked", signature->email);
cl_assert_equal_s("", signature->name);
cl_assert_equal_s("foo@example.com", signature->email);
cl_assert_equal_s("<Yu V. Bin Haacked>", signature->name);
cl_assert_equal_i(1323847743, (int)signature->when.time);
cl_assert_equal_i(60, signature->when.offset);