#include "cache.h"
#include "tag.h"
+#include "exec_cmd.h"
/*
* A signature file has a very simple fixed format: four lines
* message and a signature block that git itself doesn't care about,
* but that can be verified with gpg or similar.
*
- * The first three lines are guaranteed to be at least 63 bytes:
+ * The first four lines are guaranteed to be at least 83 bytes:
* "object <sha1>\n" is 48 bytes, "type tag\n" at 9 bytes is the
- * shortest possible type-line, and "tag .\n" at 6 bytes is the
- * shortest single-character-tag line.
- *
- * We also artificially limit the size of the full object to 8kB.
- * Just because I'm a lazy bastard, and if you can't fit a signature
- * in that size, you're doing something wrong.
+ * shortest possible type-line, "tag .\n" at 6 bytes is the shortest
+ * single-character-tag line, and "tagger . <> 0 +0000\n" at 20 bytes is
+ * the shortest possible tagger-line.
*/
-/* Some random size */
-#define MAXSIZE (8192)
-
/*
* We refuse to tag something we can't verify. Just because.
*/
static int verify_object(unsigned char *sha1, const char *expected_type)
{
int ret = -1;
- char type[100];
+ enum object_type type;
unsigned long size;
- void *buffer = read_sha1_file(sha1, type, &size);
+ void *buffer = read_sha1_file(sha1, &type, &size);
if (buffer) {
- if (!strcmp(type, expected_type))
- ret = check_sha1_signature(sha1, buffer, size, type);
+ if (type == type_from_string(expected_type))
+ ret = check_sha1_signature(sha1, buffer, size, expected_type);
free(buffer);
}
return ret;
int typelen;
char type[20];
unsigned char sha1[20];
- const char *object, *type_line, *tag_line, *tagger_line;
+ const char *object, *type_line, *tag_line, *tagger_line, *lb, *rb;
+ size_t len;
- if (size < 64)
+ if (size < 84)
return error("wanna fool me ? you obviously got the size wrong !");
buffer[size] = 0;
/* Verify the tagger line */
tagger_line = tag_line;
- if (memcmp(tagger_line, "tagger", 6) || (tagger_line[6] == '\n'))
- return error("char" PD_FMT ": could not find \"tagger\"", tagger_line - buffer);
-
- /* TODO: check for committer info + blank line? */
- /* Also, the minimum length is probably + "tagger .", or 63+8=71 */
+ if (memcmp(tagger_line, "tagger ", 7))
+ return error("char" PD_FMT ": could not find \"tagger \"",
+ tagger_line - buffer);
+
+ /*
+ * Check for correct form for name and email
+ * i.e. " <" followed by "> " on _this_ line
+ * No angle brackets within the name or email address fields.
+ * No spaces within the email address field.
+ */
+ tagger_line += 7;
+ if (!(lb = strstr(tagger_line, " <")) || !(rb = strstr(lb+2, "> ")) ||
+ strpbrk(tagger_line, "<>\n") != lb+1 ||
+ strpbrk(lb+2, "><\n ") != rb)
+ return error("char" PD_FMT ": malformed tagger field",
+ tagger_line - buffer);
+
+ /* Check for author name, at least one character, space is acceptable */
+ if (lb == tagger_line)
+ return error("char" PD_FMT ": missing tagger name",
+ tagger_line - buffer);
+
+ /* timestamp, 1 or more digits followed by space */
+ tagger_line = rb + 2;
+ if (!(len = strspn(tagger_line, "0123456789")))
+ return error("char" PD_FMT ": missing tag timestamp",
+ tagger_line - buffer);
+ tagger_line += len;
+ if (*tagger_line != ' ')
+ return error("char" PD_FMT ": malformed tag timestamp",
+ tagger_line - buffer);
+ tagger_line++;
+
+ /* timezone, 5 digits [+-]hhmm, max. 1400 */
+ if (!((tagger_line[0] == '+' || tagger_line[0] == '-') &&
+ strspn(tagger_line+1, "0123456789") == 4 &&
+ tagger_line[5] == '\n' && atoi(tagger_line+1) <= 1400))
+ return error("char" PD_FMT ": malformed tag timezone",
+ tagger_line - buffer);
+ tagger_line += 6;
+
+ /* Verify the blank line separating the header from the body */
+ if (*tagger_line != '\n')
+ return error("char" PD_FMT ": trailing garbage in tag header",
+ tagger_line - buffer);
/* The actual stuff afterwards we don't care about.. */
return 0;
int main(int argc, char **argv)
{
- unsigned long size = 4096;
- char *buffer = xmalloc(size);
+ struct strbuf buf = STRBUF_INIT;
unsigned char result_sha1[20];
if (argc != 1)
usage("git-mktag < signaturefile");
+ git_extract_argv0_path(argv[0]);
+
setup_git_directory();
- if (read_pipe(0, &buffer, &size)) {
- free(buffer);
+ if (strbuf_read(&buf, 0, 4096) < 0) {
die("could not read from stdin");
}
/* Verify it for some basic sanity: it needs to start with
"object <sha1>\ntype\ntagger " */
- if (verify_tag(buffer, size) < 0)
+ if (verify_tag(buf.buf, buf.len) < 0)
die("invalid tag signature file");
- if (write_sha1_file(buffer, size, tag_type, result_sha1) < 0)
+ if (write_sha1_file(buf.buf, buf.len, tag_type, result_sha1) < 0)
die("unable to write tag file");
- free(buffer);
-
+ strbuf_release(&buf);
printf("%s\n", sha1_to_hex(result_sha1));
return 0;
}