#include "tag.h"
/*
- * A signature file has a very simple fixed format: three lines
- * of "object <sha1>" + "type <typename>" + "tag <tagname>",
- * followed by some free-form signature that git itself doesn't
- * care about, but that can be verified with gpg or similar.
+ * A signature file has a very simple fixed format: four lines
+ * of "object <sha1>" + "type <typename>" + "tag <tagname>" +
+ * "tagger <committer>", followed by a blank line, a free-form tag
+ * 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:
* "object <sha1>\n" is 48 bytes, "type tag\n" at 9 bytes is the
* in that size, you're doing something wrong.
*/
-// Some random size
+/* Some random size */
#define MAXSIZE (8192)
/*
return ret;
}
+#ifdef NO_C99_FORMAT
+#define PD_FMT "%d"
+#else
+#define PD_FMT "%td"
+#endif
+
static int verify_tag(char *buffer, unsigned long size)
{
int typelen;
unsigned char sha1[20];
const char *object, *type_line, *tag_line, *tagger_line;
- if (size < 64 || size > MAXSIZE-1)
- return -1;
+ if (size < 64)
+ return error("wanna fool me ? you obviously got the size wrong !");
+
buffer[size] = 0;
/* Verify object line */
object = buffer;
if (memcmp(object, "object ", 7))
- return -1;
+ return error("char%d: does not start with \"object \"", 0);
+
if (get_sha1_hex(object + 7, sha1))
- return -1;
+ return error("char%d: could not get SHA1 hash", 7);
/* Verify type line */
type_line = object + 48;
if (memcmp(type_line - 1, "\ntype ", 6))
- return -1;
+ return error("char%d: could not find \"\\ntype \"", 47);
/* Verify tag-line */
tag_line = strchr(type_line, '\n');
if (!tag_line)
- return -1;
+ return error("char" PD_FMT ": could not find next \"\\n\"", type_line - buffer);
tag_line++;
if (memcmp(tag_line, "tag ", 4) || tag_line[4] == '\n')
- return -1;
+ return error("char" PD_FMT ": no \"tag \" found", tag_line - buffer);
/* Get the actual type */
typelen = tag_line - type_line - strlen("type \n");
if (typelen >= sizeof(type))
- return -1;
+ return error("char" PD_FMT ": type too long", type_line+5 - buffer);
+
memcpy(type, type_line+5, typelen);
type[typelen] = 0;
/* Verify that the object matches */
- if (get_sha1_hex(object + 7, sha1))
- return -1;
if (verify_object(sha1, type))
- return -1;
+ return error("char%d: could not verify object %s", 7, sha1_to_hex(sha1));
/* Verify the tag-name: we don't allow control characters or spaces in it */
tag_line += 4;
break;
if (c > ' ')
continue;
- return -1;
+ return error("char" PD_FMT ": could not verify tag name", tag_line - buffer);
}
/* Verify the tagger line */
tagger_line = tag_line;
if (memcmp(tagger_line, "tagger", 6) || (tagger_line[6] == '\n'))
- return -1;
+ 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 */
/* The actual stuff afterwards we don't care about.. */
return 0;
}
+#undef PD_FMT
+
int main(int argc, char **argv)
{
- unsigned long size;
- char buffer[MAXSIZE];
+ unsigned long size = 4096;
+ char *buffer = malloc(size);
unsigned char result_sha1[20];
if (argc != 1)
setup_git_directory();
- // Read the signature
- size = 0;
- for (;;) {
- int ret = xread(0, buffer + size, MAXSIZE - size);
- if (ret <= 0)
- break;
- size += ret;
+ if (read_pipe(0, &buffer, &size)) {
+ free(buffer);
+ die("could not read from stdin");
}
- // Verify it for some basic sanity: it needs to start with "object <sha1>\ntype\ntagger "
+ /* Verify it for some basic sanity: it needs to start with
+ "object <sha1>\ntype\ntagger " */
if (verify_tag(buffer, size) < 0)
die("invalid tag signature file");
if (write_sha1_file(buffer, size, tag_type, result_sha1) < 0)
die("unable to write tag file");
+
+ free(buffer);
+
printf("%s\n", sha1_to_hex(result_sha1));
return 0;
}