#include "cache.h"

#include "remote.h"

#include "strbuf.h"

#include "walker.h"

#include "http.h"

#include "exec_cmd.h"

#include "run-command.h"

#include "pkt-line.h"

#include "sideband.h"

static struct remote *remote;

static const char *url; /* always ends with a trailing slash */

struct options {

};

static struct options options;

static int set_option(const char *name, const char *value)

{

if (!strcmp(name, "verbosity")) {

char *end;

int v = strtol(value, &end, 10);

if (value == end || *end)

return -1;

options.verbosity = v;

return 0;

}

else if (!strcmp(name, "progress")) {

if (!strcmp(value, "true"))

options.progress = 1;

else if (!strcmp(value, "false"))

options.progress = 0;

else

return -1;

return 0;

}

else if (!strcmp(name, "depth")) {

char *end;

unsigned long v = strtoul(value, &end, 10);

if (value == end || *end)

return -1;

options.depth = v;

return 0;

}

else if (!strcmp(name, "followtags")) {

if (!strcmp(value, "true"))

options.followtags = 1;

else if (!strcmp(value, "false"))

options.followtags = 0;

else

return -1;

return 0;

}

else if (!strcmp(name, "dry-run")) {

if (!strcmp(value, "true"))

options.dry_run = 1;

else if (!strcmp(value, "false"))

options.dry_run = 0;

else

return -1;

return 0;

}

else {

return 1 /* unsupported */;

}

}

struct discovery {

};

static struct discovery *last_discovery;

static void free_discovery(struct discovery *d)

{

if (d) {

if (d == last_discovery)

last_discovery = NULL;

free(d->buf_alloc);

free(d);

}

}

static struct discovery* discover_refs(const char *service)

{

struct strbuf buffer = STRBUF_INIT;

struct discovery *last = last_discovery;

char *refs_url;

int http_ret, is_http = 0, proto_git_candidate = 1;

if (last && !strcmp(service, last->service))

return last;

free_discovery(last);

strbuf_addf(&buffer, "%sinfo/refs", url);

if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {

is_http = 1;

if (!strchr(url, '?'))

strbuf_addch(&buffer, '?');

else

strbuf_addch(&buffer, '&');

strbuf_addf(&buffer, "service=%s", service);

}

refs_url = strbuf_detach(&buffer, NULL);

http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);

/* try again with "plain" url (no ? or & appended) */

if (http_ret != HTTP_OK) {

free(refs_url);

strbuf_reset(&buffer);

proto_git_candidate = 0;

strbuf_addf(&buffer, "%sinfo/refs", url);

refs_url = strbuf_detach(&buffer, NULL);

http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);

}

switch (http_ret) {

case HTTP_OK:

break;

case HTTP_MISSING_TARGET:

die("%s not found: did you run git update-server-info on the"

" server?", refs_url);

case HTTP_NOAUTH:

die("Authentication failed");

default:

http_error(refs_url, http_ret);

die("HTTP request failed");

}

last= xcalloc(1, sizeof(*last_discovery));

last->service = service;

last->buf_alloc = strbuf_detach(&buffer, &last->len);

last->buf = last->buf_alloc;

if (is_http && proto_git_candidate

&& 5 <= last->len && last->buf[4] == '#') {

/* smart HTTP response; validate that the service

* pkt-line matches our request.

*/

struct strbuf exp = STRBUF_INIT;

if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)

die("%s has invalid packet header", refs_url);

if (buffer.len && buffer.buf[buffer.len - 1] == '\n')

strbuf_setlen(&buffer, buffer.len - 1);

strbuf_addf(&exp, "# service=%s", service);

if (strbuf_cmp(&exp, &buffer))

die("invalid server response; got '%s'", buffer.buf);

strbuf_release(&exp);

/* The header can include additional metadata lines, up

* until a packet flush marker. Ignore these now, but

* in the future we might start to scan them.

*/

strbuf_reset(&buffer);

while (packet_get_line(&buffer, &last->buf, &last->len) > 0)

strbuf_reset(&buffer);

last->proto_git = 1;

}

free(refs_url);

strbuf_release(&buffer);

last_discovery = last;

return last;

}

static int write_discovery(int in, int out, void *data)

{

struct discovery *heads = data;

int err = 0;

if (write_in_full(out, heads->buf, heads->len) != heads->len)

err = 1;

close(out);

return err;

}

static struct ref *parse_git_refs(struct discovery *heads)

{

struct ref *list = NULL;

struct async async;

memset(&async, 0, sizeof(async));

async.proc = write_discovery;

async.data = heads;

async.out = -1;

if (start_async(&async))

die("cannot start thread to parse advertised refs");

get_remote_heads(async.out, &list, 0, NULL, 0, NULL);

close(async.out);

if (finish_async(&async))

die("ref parsing thread failed");

return list;

}

static struct ref *parse_info_refs(struct discovery *heads)

{

char *data, *start, *mid;

char *ref_name;

int i = 0;

struct ref *refs = NULL;

struct ref *ref = NULL;

struct ref *last_ref = NULL;

data = heads->buf;

start = NULL;

mid = data;

while (i < heads->len) {

if (!start) {

start = &data[i];

}

if (data[i] == '\t')

mid = &data[i];

if (data[i] == '\n') {

data[i] = 0;

ref_name = mid + 1;

ref = xmalloc(sizeof(struct ref) +

strlen(ref_name) + 1);

memset(ref, 0, sizeof(struct ref));

strcpy(ref->name, ref_name);

get_sha1_hex(start, ref->old_sha1);

if (!refs)

refs = ref;

if (last_ref)

last_ref->next = ref;

last_ref = ref;

start = NULL;

}

i++;

}

ref = alloc_ref("HEAD");

if (!http_fetch_ref(url, ref) &&

!resolve_remote_symref(ref, refs)) {

ref->next = refs;

refs = ref;

} else {

free(ref);

}

return refs;

}

static struct ref *get_refs(int for_push)

{

struct discovery *heads;

if (for_push)

heads = discover_refs("git-receive-pack");

else

heads = discover_refs("git-upload-pack");

if (heads->proto_git)

return parse_git_refs(heads);

return parse_info_refs(heads);

}

static void output_refs(struct ref *refs)

{

struct ref *posn;

for (posn = refs; posn; posn = posn->next) {

if (posn->symref)

printf("@%s %s\n", posn->symref, posn->name);

else

printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);

}

printf("\n");

fflush(stdout);

free_refs(refs);

}

struct rpc_state {

};

static size_t rpc_out(void *ptr, size_t eltsize,

size_t nmemb, void *buffer_)

{

size_t max = eltsize * nmemb;

struct rpc_state *rpc = buffer_;

size_t avail = rpc->len - rpc->pos;

if (!avail) {

rpc->initial_buffer = 0;

avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);

if (!avail)

return 0;

rpc->pos = 0;

rpc->len = avail;

}

if (max < avail)

avail = max;

memcpy(ptr, rpc->buf + rpc->pos, avail);

rpc->pos += avail;

return avail;

}

#ifndef NO_CURL_IOCTL

static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)

{

struct rpc_state *rpc = clientp;

switch (cmd) {

case CURLIOCMD_NOP:

return CURLIOE_OK;

case CURLIOCMD_RESTARTREAD:

if (rpc->initial_buffer) {

rpc->pos = 0;

return CURLIOE_OK;

}

fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");

return CURLIOE_FAILRESTART;

default:

return CURLIOE_UNKNOWNCMD;

}

}

#endif

static size_t rpc_in(const void *ptr, size_t eltsize,

size_t nmemb, void *buffer_)

{

size_t size = eltsize * nmemb;

struct rpc_state *rpc = buffer_;

write_or_die(rpc->in, ptr, size);

return size;

}

static int post_rpc(struct rpc_state *rpc)

{

struct active_request_slot *slot;

struct slot_results results;

struct curl_slist *headers = NULL;

int use_gzip = rpc->gzip_request;

char *gzip_body = NULL;

int err = 0, large_request = 0;

/* Try to load the entire request, if we can fit it into the

* allocated buffer space we can use HTTP/1.0 and avoid the

* chunked encoding mess.

*/

while (1) {

size_t left = rpc->alloc - rpc->len;

char *buf = rpc->buf + rpc->len;

int n;

if (left < LARGE_PACKET_MAX) {

large_request = 1;

use_gzip = 0;

break;

}

n = packet_read_line(rpc->out, buf, left);

if (!n)

break;

rpc->len += n;

}

slot = get_active_slot();

slot->results = &results;

curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);

curl_easy_setopt(slot->curl, CURLOPT_POST, 1);

curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);

curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");

headers = curl_slist_append(headers, rpc->hdr_content_type);

headers = curl_slist_append(headers, rpc->hdr_accept);

if (large_request) {

/* The request body is large and the size cannot be predicted.

* We must use chunked encoding to send it.

*/

headers = curl_slist_append(headers, "Expect: 100-continue");

headers = curl_slist_append(headers, "Transfer-Encoding: chunked");

rpc->initial_buffer = 1;

curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);

curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);

#ifndef NO_CURL_IOCTL

curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);

curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);

#endif

if (options.verbosity > 1) {

fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);

fflush(stderr);

}

} else if (use_gzip && 1024 < rpc->len) {

/* The client backend isn't giving us compressed data so

* we can try to deflate it ourselves, this may save on.

* the transfer time.

*/

size_t size;

z_stream stream;

int ret;

memset(&stream, 0, sizeof(stream));

ret = deflateInit2(&stream, Z_BEST_COMPRESSION,

Z_DEFLATED, (15 + 16),

8, Z_DEFAULT_STRATEGY);

if (ret != Z_OK)

die("cannot deflate request; zlib init error %d", ret);

size = deflateBound(&stream, rpc->len);

gzip_body = xmalloc(size);

stream.next_in = (unsigned char *)rpc->buf;

stream.avail_in = rpc->len;

stream.next_out = (unsigned char *)gzip_body;

stream.avail_out = size;

ret = deflate(&stream, Z_FINISH);

if (ret != Z_STREAM_END)

die("cannot deflate request; zlib deflate error %d", ret);

ret = deflateEnd(&stream);

if (ret != Z_OK)

die("cannot deflate request; zlib end error %d", ret);

size = stream.total_out;

headers = curl_slist_append(headers, "Content-Encoding: gzip");

curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);

curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);

if (options.verbosity > 1) {

fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",

rpc->service_name,

(unsigned long)rpc->len, (unsigned long)size);

fflush(stderr);

}

} else {

/* We know the complete request size in advance, use the

* more normal Content-Length approach.

*/

curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);

curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);

if (options.verbosity > 1) {

fprintf(stderr, "POST %s (%lu bytes)\n",

rpc->service_name, (unsigned long)rpc->len);

fflush(stderr);

}

}

curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);

curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);

curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);

slot->curl_result = curl_easy_perform(slot->curl);

finish_active_slot(slot);

if (results.curl_result != CURLE_OK) {

err |= error("RPC failed; result=%d, HTTP code = %ld",

results.curl_result, results.http_code);

}

curl_slist_free_all(headers);

free(gzip_body);

return err;

}

static int rpc_service(struct rpc_state *rpc, struct discovery *heads)

{

const char *svc = rpc->service_name;

struct strbuf buf = STRBUF_INIT;

struct child_process client;

int err = 0;

memset(&client, 0, sizeof(client));

client.in = -1;

client.out = -1;

client.git_cmd = 1;

client.argv = rpc->argv;

if (start_command(&client))

exit(1);

if (heads)

write_or_die(client.in, heads->buf, heads->len);

rpc->alloc = http_post_buffer;

rpc->buf = xmalloc(rpc->alloc);

rpc->in = client.in;

rpc->out = client.out;

strbuf_init(&rpc->result, 0);

strbuf_addf(&buf, "%s%s", url, svc);

rpc->service_url = strbuf_detach(&buf, NULL);

strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);

rpc->hdr_content_type = strbuf_detach(&buf, NULL);

strbuf_addf(&buf, "Accept: application/x-%s-result", svc);

rpc->hdr_accept = strbuf_detach(&buf, NULL);

while (!err) {

int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);

if (!n)

break;

rpc->pos = 0;

rpc->len = n;

err |= post_rpc(rpc);

}

strbuf_read(&rpc->result, client.out, 0);

close(client.in);

close(client.out);

client.in = -1;

client.out = -1;

err |= finish_command(&client);

free(rpc->service_url);

free(rpc->hdr_content_type);

free(rpc->hdr_accept);

free(rpc->buf);

strbuf_release(&buf);

return err;

}

static int fetch_dumb(int nr_heads, struct ref **to_fetch)

{

struct walker *walker;

char **targets = xmalloc(nr_heads * sizeof(char*));

int ret, i;

if (options.depth)

die("dumb http transport does not support --depth");

for (i = 0; i < nr_heads; i++)

targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));

walker = get_http_walker(url);

walker->get_all = 1;

walker->get_tree = 1;

walker->get_history = 1;

walker->get_verbosely = options.verbosity >= 3;

walker->get_recover = 0;

ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);

walker_free(walker);

for (i = 0; i < nr_heads; i++)

free(targets[i]);

free(targets);

return ret ? error("Fetch failed.") : 0;

}

static int fetch_git(struct discovery *heads,

int nr_heads, struct ref **to_fetch)

{

struct rpc_state rpc;

char *depth_arg = NULL;

const char **argv;

int argc = 0, i, err;

argv = xmalloc((15 + nr_heads) * sizeof(char*));

argv[argc++] = "fetch-pack";

argv[argc++] = "--stateless-rpc";

argv[argc++] = "--lock-pack";

if (options.followtags)

argv[argc++] = "--include-tag";

if (options.thin)

argv[argc++] = "--thin";

if (options.verbosity >= 3) {

argv[argc++] = "-v";

argv[argc++] = "-v";

}

if (!options.progress)

argv[argc++] = "--no-progress";

if (options.depth) {

struct strbuf buf = STRBUF_INIT;

strbuf_addf(&buf, "--depth=%lu", options.depth);

depth_arg = strbuf_detach(&buf, NULL);

argv[argc++] = depth_arg;

}

argv[argc++] = url;

for (i = 0; i < nr_heads; i++) {

struct ref *ref = to_fetch[i];

if (!ref->name || !*ref->name)

die("cannot fetch by sha1 over smart http");

argv[argc++] = ref->name;

}

argv[argc++] = NULL;

memset(&rpc, 0, sizeof(rpc));

rpc.service_name = "git-upload-pack",

rpc.argv = argv;

rpc.gzip_request = 1;

err = rpc_service(&rpc, heads);

if (rpc.result.len)

safe_write(1, rpc.result.buf, rpc.result.len);

strbuf_release(&rpc.result);

free(argv);

free(depth_arg);

return err;

}

static int fetch(int nr_heads, struct ref **to_fetch)

{

struct discovery *d = discover_refs("git-upload-pack");

if (d->proto_git)

return fetch_git(d, nr_heads, to_fetch);

else

return fetch_dumb(nr_heads, to_fetch);

}

static void parse_fetch(struct strbuf *buf)

{

struct ref **to_fetch = NULL;

struct ref *list_head = NULL;

struct ref **list = &list_head;

int alloc_heads = 0, nr_heads = 0;

do {

if (!prefixcmp(buf->buf, "fetch ")) {

char *p = buf->buf + strlen("fetch ");

char *name;

struct ref *ref;

unsigned char old_sha1[20];

if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))

die("protocol error: expected sha/ref, got %s'", p);

if (p[40] == ' ')

name = p + 41;

else if (!p[40])

name = "";

else

die("protocol error: expected sha/ref, got %s'", p);

ref = alloc_ref(name);

hashcpy(ref->old_sha1, old_sha1);

*list = ref;

list = &ref->next;

ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);

to_fetch[nr_heads++] = ref;

}

else

die("http transport does not support %s", buf->buf);

strbuf_reset(buf);

if (strbuf_getline(buf, stdin, '\n') == EOF)

return;

if (!*buf->buf)

break;

} while (1);

if (fetch(nr_heads, to_fetch))

exit(128); /* error already reported */

free_refs(list_head);

free(to_fetch);

printf("\n");

fflush(stdout);

strbuf_reset(buf);

}

static int push_dav(int nr_spec, char **specs)

{

const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));

int argc = 0, i;

argv[argc++] = "http-push";

argv[argc++] = "--helper-status";

if (options.dry_run)

argv[argc++] = "--dry-run";

if (options.verbosity > 1)

argv[argc++] = "--verbose";

argv[argc++] = url;

for (i = 0; i < nr_spec; i++)

argv[argc++] = specs[i];

argv[argc++] = NULL;

if (run_command_v_opt(argv, RUN_GIT_CMD))

die("git-%s failed", argv[0]);

free(argv);

return 0;

}

static int push_git(struct discovery *heads, int nr_spec, char **specs)

{

struct rpc_state rpc;

const char **argv;

int argc = 0, i, err;

argv = xmalloc((10 + nr_spec) * sizeof(char*));

argv[argc++] = "send-pack";

argv[argc++] = "--stateless-rpc";

argv[argc++] = "--helper-status";

if (options.thin)

argv[argc++] = "--thin";

if (options.dry_run)

argv[argc++] = "--dry-run";

if (options.verbosity > 1)

argv[argc++] = "--verbose";

argv[argc++] = url;

for (i = 0; i < nr_spec; i++)

argv[argc++] = specs[i];

argv[argc++] = NULL;

memset(&rpc, 0, sizeof(rpc));

rpc.service_name = "git-receive-pack",

rpc.argv = argv;

err = rpc_service(&rpc, heads);

if (rpc.result.len)

safe_write(1, rpc.result.buf, rpc.result.len);

strbuf_release(&rpc.result);

free(argv);

return err;

}

static int push(int nr_spec, char **specs)

{

struct discovery *heads = discover_refs("git-receive-pack");

int ret;

if (heads->proto_git)

ret = push_git(heads, nr_spec, specs);

else

ret = push_dav(nr_spec, specs);

free_discovery(heads);

return ret;

}

static void parse_push(struct strbuf *buf)

{

char **specs = NULL;

int alloc_spec = 0, nr_spec = 0, i;

do {

if (!prefixcmp(buf->buf, "push ")) {

ALLOC_GROW(specs, nr_spec + 1, alloc_spec);

specs[nr_spec++] = xstrdup(buf->buf + 5);

}

else

die("http transport does not support %s", buf->buf);

strbuf_reset(buf);

if (strbuf_getline(buf, stdin, '\n') == EOF)

return;

if (!*buf->buf)

break;

} while (1);

if (push(nr_spec, specs))

exit(128); /* error already reported */

for (i = 0; i < nr_spec; i++)

free(specs[i]);

free(specs);

printf("\n");

fflush(stdout);

}

int main(int argc, const char **argv)

{

struct strbuf buf = STRBUF_INIT;

int nongit;

git_extract_argv0_path(argv[0]);

setup_git_directory_gently(&nongit);

if (argc < 2) {

fprintf(stderr, "Remote needed\n");

return 1;

}

options.verbosity = 1;

options.progress = !!isatty(2);

options.thin = 1;

remote = remote_get(argv[1]);

if (argc > 2) {

end_url_with_slash(&buf, argv[2]);

} else {

end_url_with_slash(&buf, remote->url[0]);

}

url = strbuf_detach(&buf, NULL);

http_init(remote);

do {

if (strbuf_getline(&buf, stdin, '\n') == EOF)

break;

if (!prefixcmp(buf.buf, "fetch ")) {

if (nongit)

die("Fetch attempted without a local repo");

parse_fetch(&buf);

} else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {

int for_push = !!strstr(buf.buf + 4, "for-push");

output_refs(get_refs(for_push));

} else if (!prefixcmp(buf.buf, "push ")) {

parse_push(&buf);

} else if (!prefixcmp(buf.buf, "option ")) {

char *name = buf.buf + strlen("option ");

char *value = strchr(name, ' ');

int result;

if (value)

*value++ = '\0';

else

value = "true";

result = set_option(name, value);

if (!result)

printf("ok\n");

else if (result < 0)

printf("error invalid value\n");

else

printf("unsupported\n");

fflush(stdout);

} else if (!strcmp(buf.buf, "capabilities")) {

printf("fetch\n");

printf("option\n");

printf("push\n");

printf("\n");

fflush(stdout);

} else {

return 1;

}

strbuf_reset(&buf);

} while (1);

http_cleanup();

return 0;

}