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/*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* In addition to the permissions in the GNU General Public License,
* the authors give you unlimited permission to link the compiled
* version of this file into combinations with other programs,
* and to distribute those combinations without any restriction
* coming from the use of this file. (The General Public License
* restrictions do apply in other respects; for example, they cover
* modification of the file, and distribution when not linked into
* a combined executable.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "git2/pkt.h"
#include "git2/types.h"
#include "git2/errors.h"
#include "common.h"
#include "util.h"
static int flush_pkt(git_pkt **out)
{
git_pkt *pkt;
pkt = git__malloc(sizeof(git_pkt));
if (pkt == NULL)
return GIT_ENOMEM;
pkt->type = GIT_PKT_FLUSH;
*out = pkt;
return GIT_SUCCESS;
}
/*
* Parse an other-ref line.
*/
int ref_pkt(git_pkt **out, const char *line, size_t len)
{
git_pkt_ref *pkt;
int error;
size_t name_len;
pkt = git__malloc(sizeof(git_pkt_ref));
if (pkt == NULL)
return GIT_ENOMEM;
memset(pkt, 0x0, sizeof(git_pkt_ref));
pkt->type = GIT_PKT_REF;
error = git_oid_fromstr(&pkt->head.oid, line);
if (error < GIT_SUCCESS) {
error = git__throw(error, "Failed to parse reference ID");
goto out;
}
/* Check for a bit of consistency */
if (line[GIT_OID_HEXSZ] != ' ') {
error = git__throw(GIT_EOBJCORRUPTED, "Failed to parse ref. No SP");
goto out;
}
/* Jump from the name */
line += GIT_OID_HEXSZ + 1;
len -= (GIT_OID_HEXSZ + 1);
name_len = min(strlen(line), len);
if (line[name_len - 1] == '\n')
--name_len;
pkt->head.name = git__strndup(line, name_len);
if (pkt->head.name == NULL) {
error = GIT_ENOMEM;
goto out;
}
/* Try to get the capabilities */
line += name_len + 1; /* + \0 */
len -= (name_len + 1);
if (line[len - 1] == '\n')
--len;
if (len > 0) { /* capatilities */
pkt->capabilities = git__malloc(len);
if (pkt->capabilities == NULL) {
error = GIT_ENOMEM;
goto out;
}
memcpy(pkt->capabilities, line, len);
}
out:
if (error < GIT_SUCCESS)
free(pkt);
else
*out = (git_pkt *)pkt;
return error;
}
/*
* As per the documentation, the syntax is:
*
* pkt-line = data-pkt / flush-pkt
* data-pkt = pkt-len pkt-payload
* pkt-len = 4*(HEXDIG)
* pkt-payload = (pkt-len -4)*(OCTET)
* flush-pkt = "0000"
*
* Which means that the first four bytes are the length of the line,
* in ASCII hexadecimal (including itself)
*/
int git_pkt_parse_line(git_pkt **head, const char *line, const char **out)
{
int error = GIT_SUCCESS;
long int len;
const int num_len = 4;
char *num;
const char *num_end;
num = git__strndup(line, num_len);
if (num == NULL)
return GIT_ENOMEM;
error = git__strtol32(&len, num, &num_end, 16);
if (error < GIT_SUCCESS) {
free(num);
return git__throw(error, "Failed to parse pkt length");
}
if (num_end - num != num_len) {
free(num);
return git__throw(GIT_EOBJCORRUPTED, "Wrong pkt length");
}
free(num);
line += num_len;
/*
* TODO: How do we deal with empty lines? Try again? with the next
* line?
*/
if (len == 4) {
*out = line;
return GIT_SUCCESS;
}
if (len == 0) { /* Flush pkt */
*out = line;
return flush_pkt(head);
}
len -= num_len; /* the length includes the space for the length */
/*
* For now, we're just going to assume we're parsing references
*/
error = ref_pkt(head, line, len);
*out = line + len;
return error;
}
void git_pkt_free(git_pkt *pkt)
{
if(pkt->type == GIT_PKT_REF) {
git_pkt_ref *p = (git_pkt_ref *) pkt;
free(p->capabilities);
free(p->head.name);
}
free(pkt);
}
/*
* Create a git procol request.
*
* For example: 0035git-upload-pack /libgit2/libgit2\0host=github.com\0
*
* TODO: the command should not be hard-coded
*/
int git_pkt_gen_proto(char **out, int *outlen, const char *url)
{
char *delim, *repo, *ptr;
char command[] = "git-upload-pack";
char host[] = "host=";
int len;
delim = strchr(url, '/');
if (delim == NULL)
return git__throw(GIT_EOBJCORRUPTED, "Failed to create proto-request: malformed URL");
repo = delim;
delim = strchr(url, ':');
if (delim == NULL)
delim = strchr(url, '/');
len = 4 + STRLEN(command) + 1 + strlen(repo) + 1 + STRLEN(host) + (delim - url) + 2;
*out = git__malloc(len);
if (*out == NULL)
return GIT_ENOMEM;
*outlen = len - 1;
ptr = *out;
memset(ptr, 0x0, len);
/* We expect the return value to be > len - 1 so don't bother checking it */
snprintf(ptr, len -1, "%04x%s %s%c%s%s", len - 1, command, repo, 0, host, url);
return GIT_SUCCESS;
}
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