/*
* Copyright (c) 2018, 2019 Ori Bernstein <ori@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/queue.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/syslimits.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <errno.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <sha1.h>
#include <zlib.h>
#include <ctype.h>
#include <limits.h>
#include <imsg.h>
#include <time.h>
#include <uuid.h>
#include <netdb.h>
#include <netinet/in.h>
#include "got_error.h"
#include "got_reference.h"
#include "got_repository.h"
#include "got_path.h"
#include "got_cancel.h"
#include "got_worktree.h"
#include "got_object.h"
#include "got_opentemp.h"
#include "got_fetch.h"
#include "got_lib_delta.h"
#include "got_lib_inflate.h"
#include "got_lib_object.h"
#include "got_lib_object_parse.h"
#include "got_lib_object_create.h"
#include "got_lib_pack.h"
#include "got_lib_sha1.h"
#include "got_lib_privsep.h"
#include "got_lib_object_cache.h"
#include "got_lib_repository.h"
#ifndef nitems
#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
#endif
#ifndef MIN
#define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
#endif
static int
hassuffix(char *base, char *suf)
{
int nb, ns;
nb = strlen(base);
ns = strlen(suf);
if (ns <= nb && strcmp(base + (nb - ns), suf) == 0)
return 1;
return 0;
}
static const struct got_error *
dial_ssh(int *fetchfd, const char *host, const char *port, const char *path,
const char *direction, int verbosity)
{
const struct got_error *error = NULL;
int pid, pfd[2];
char cmd[64];
char *argv[9];
int i = 0;
*fetchfd = -1;
argv[0] = GOT_FETCH_PATH_SSH;
if (verbosity == -1) {
argv[1 + i++] = "-q";
} else {
/* ssh(1) allows up to 3 "-v" options. */
for (i = 0; i < MIN(3, verbosity); i++)
argv[1 + i] = "-v";
}
argv[1 + i] = "--";
argv[2 + i] = (char *)host;
argv[3 + i] = (char *)cmd;
argv[4 + i] = (char *)path;
argv[5 + i] = NULL;
if (pipe(pfd) == -1)
return got_error_from_errno("pipe");
pid = fork();
if (pid == -1) {
error = got_error_from_errno("fork");
close(pfd[0]);
close(pfd[1]);
return error;
} else if (pid == 0) {
int n;
close(pfd[1]);
dup2(pfd[0], 0);
dup2(pfd[0], 1);
n = snprintf(cmd, sizeof(cmd), "git-%s-pack", direction);
if (n < 0 || n >= sizeof(cmd))
err(1, "snprintf");
if (execv(GOT_FETCH_PATH_SSH, argv) == -1)
err(1, "execl");
abort(); /* not reached */
} else {
close(pfd[0]);
*fetchfd = pfd[1];
return NULL;
}
}
static const struct got_error *
dial_git(int *fetchfd, const char *host, const char *port, const char *path,
const char *direction)
{
const struct got_error *err = NULL;
struct addrinfo hints, *servinfo, *p;
char *cmd = NULL, *pkt = NULL;
int fd = -1, totlen, r, eaicode;
*fetchfd = -1;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
eaicode = getaddrinfo(host, port, &hints, &servinfo);
if (eaicode) {
char msg[512];
snprintf(msg, sizeof(msg), "%s: %s", host,
gai_strerror(eaicode));
return got_error_msg(GOT_ERR_ADDRINFO, msg);
}
for (p = servinfo; p != NULL; p = p->ai_next) {
if ((fd = socket(p->ai_family, p->ai_socktype,
p->ai_protocol)) == -1)
continue;
if (connect(fd, p->ai_addr, p->ai_addrlen) == 0)
break;
err = got_error_from_errno("connect");
close(fd);
}
if (p == NULL)
goto done;
if (asprintf(&cmd, "git-%s-pack %s", direction, path) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
totlen = 4 + strlen(cmd) + 1 + strlen("host=") + strlen(host) + 1;
if (asprintf(&pkt, "%04x%s", totlen, cmd) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
r = write(fd, pkt, strlen(pkt) + 1);
if (r == -1) {
err = got_error_from_errno("write");
goto done;
}
if (asprintf(&pkt, "host=%s", host) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
r = write(fd, pkt, strlen(pkt) + 1);
if (r == -1) {
err = got_error_from_errno("write");
goto done;
}
done:
free(cmd);
free(pkt);
if (err) {
if (fd != -1)
close(fd);
} else
*fetchfd = fd;
return err;
}
const struct got_error *
got_fetch_connect(int *fetchfd, const char *proto, const char *host,
const char *port, const char *server_path, int verbosity)
{
const struct got_error *err = NULL;
*fetchfd = -1;
if (strcmp(proto, "ssh") == 0 || strcmp(proto, "git+ssh") == 0)
err = dial_ssh(fetchfd, host, port, server_path, "upload",
verbosity);
else if (strcmp(proto, "git") == 0)
err = dial_git(fetchfd, host, port, server_path, "upload");
else if (strcmp(proto, "http") == 0 || strcmp(proto, "git+http") == 0)
err = got_error_path(proto, GOT_ERR_NOT_IMPL);
else
err = got_error_path(proto, GOT_ERR_BAD_PROTO);
return err;
}
const struct got_error *
got_fetch_parse_uri(char **proto, char **host, char **port,
char **server_path, char **repo_name, const char *uri)
{
const struct got_error *err = NULL;
char *s, *p, *q;
int n;
*proto = *host = *port = *server_path = *repo_name = NULL;
p = strstr(uri, "://");
if (!p) {
/* Try parsing Git's "scp" style URL syntax. */
*proto = strdup("ssh");
if (proto == NULL) {
err = got_error_from_errno("strdup");
goto done;
}
*port = strdup("22");
if (*port == NULL) {
err = got_error_from_errno("strdup");
goto done;
}
s = (char *)uri;
q = strchr(s, ':');
if (q == NULL) {
err = got_error(GOT_ERR_PARSE_URI);
goto done;
}
/* No slashes allowed before first colon. */
p = strchr(s, '/');
if (p && q > p) {
err = got_error(GOT_ERR_PARSE_URI);
goto done;
}
*host = strndup(s, q - s);
if (*host == NULL) {
err = got_error_from_errno("strndup");
goto done;
}
p = q + 1;
} else {
*proto = strndup(uri, p - uri);
if (proto == NULL) {
err = got_error_from_errno("strndup");
goto done;
}
s = p + 3;
p = strstr(s, "/");
if (p == NULL || strlen(p) == 1) {
err = got_error(GOT_ERR_PARSE_URI);
goto done;
}
q = memchr(s, ':', p - s);
if (q) {
*host = strndup(s, q - s);
if (*host == NULL) {
err = got_error_from_errno("strndup");
goto done;
}
*port = strndup(q + 1, p - (q + 1));
if (*port == NULL) {
err = got_error_from_errno("strndup");
goto done;
}
} else {
*host = strndup(s, p - s);
if (*host == NULL) {
err = got_error_from_errno("strndup");
goto done;
}
if (asprintf(port, "%u", GOT_DEFAULT_GIT_PORT) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
}
}
*server_path = strdup(p);
if (*server_path == NULL) {
err = got_error_from_errno("strdup");
goto done;
}
p = strrchr(p, '/');
if (!p || strlen(p) <= 1) {
err = got_error(GOT_ERR_PARSE_URI);
goto done;
}
p++;
n = strlen(p);
if (n == 0) {
err = got_error(GOT_ERR_PARSE_URI);
goto done;
}
if (hassuffix(p, ".git"))
n -= 4;
*repo_name = strndup(p, (p + n) - p);
if (*repo_name == NULL) {
err = got_error_from_errno("strndup");
goto done;
}
done:
if (err) {
free(*proto);
*proto = NULL;
free(*host);
*host = NULL;
free(*port);
*port = NULL;
free(*server_path);
*server_path = NULL;
free(*repo_name);
*repo_name = NULL;
}
return err;
}
static const struct got_error *
check_pack_hash(int fd, size_t sz, uint8_t *hcomp)
{
SHA1_CTX ctx;
uint8_t hexpect[SHA1_DIGEST_LENGTH];
uint8_t buf[32 * 1024];
ssize_t n, r, nr;
if (sz < sizeof(struct got_packfile_hdr) + SHA1_DIGEST_LENGTH)
return got_error_msg(GOT_ERR_BAD_PACKFILE, "short packfile");
n = 0;
SHA1Init(&ctx);
while (n < sz - 20) {
nr = sizeof(buf);
if (sz - n - 20 < sizeof(buf))
nr = sz - n - 20;
r = read(fd, buf, nr);
if (r == -1)
return got_error_from_errno("read");
if (r != nr)
return got_error_msg(GOT_ERR_BAD_PACKFILE,
"short pack file");
SHA1Update(&ctx, buf, nr);
n += r;
}
SHA1Final(hcomp, &ctx);
r = read(fd, hexpect, sizeof(hexpect));
if (r == -1)
return got_error_from_errno("read");
if (r != sizeof(hexpect))
return got_error_msg(GOT_ERR_BAD_PACKFILE,
"short pack file");
if (memcmp(hcomp, hexpect, SHA1_DIGEST_LENGTH) != 0)
return got_error_msg(GOT_ERR_BAD_PACKFILE,
"packfile checksum mismatch");
return NULL;
}
const struct got_error*
got_fetch_pack(struct got_object_id **pack_hash, struct got_pathlist_head *refs,
struct got_pathlist_head *symrefs, const char *remote_name, int fetchfd,
struct got_repository *repo, got_fetch_progress_cb progress_cb,
void *progress_arg)
{
int imsg_fetchfds[2], imsg_idxfds[2];
int packfd = -1, npackfd = -1, idxfd = -1, nidxfd = -1, nfetchfd = -1;
int tmpfds[3], i;
int fetchstatus, idxstatus, done = 0;
const struct got_error *err;
struct imsgbuf fetchibuf, idxibuf;
pid_t fetchpid, idxpid;
char *tmppackpath = NULL, *tmpidxpath = NULL;
char *packpath = NULL, *idxpath = NULL, *id_str = NULL;
const char *repo_path = got_repo_get_path(repo);
struct got_pathlist_head have_refs;
struct got_pathlist_entry *pe;
struct got_reflist_head my_refs;
struct got_reflist_entry *re;
off_t packfile_size = 0;
char *ref_prefix = NULL;
size_t ref_prefixlen = 0;
char *path;
*pack_hash = NULL;
for (i = 0; i < nitems(tmpfds); i++)
tmpfds[i] = -1;
TAILQ_INIT(&have_refs);
SIMPLEQ_INIT(&my_refs);
if (asprintf(&ref_prefix, "refs/remotes/%s/", remote_name) == -1)
return got_error_from_errno("asprintf");
ref_prefixlen = strlen(ref_prefix);
err = got_ref_list(&my_refs, repo, NULL, got_ref_cmp_by_name, NULL);
if (err)
goto done;
SIMPLEQ_FOREACH(re, &my_refs, entry) {
struct got_object_id *id;
const char *refname;
if (got_ref_is_symbolic(re->ref))
continue;
refname = got_ref_get_name(re->ref);
if (strncmp("refs/tags/", refname, 10) == 0) {
char *tagname;
err = got_ref_resolve(&id, repo, re->ref);
if (err)
goto done;
tagname = strdup(refname);
if (tagname == NULL) {
err = got_error_from_errno("strdup");
goto done;
}
err = got_pathlist_append(&have_refs, tagname, id);
if (err) {
free(tagname);
goto done;
}
}
if (strncmp(ref_prefix, refname, ref_prefixlen) == 0) {
char *branchname;
err = got_ref_resolve(&id, repo, re->ref);
if (err)
goto done;
if (asprintf(&branchname, "refs/heads/%s",
refname + ref_prefixlen) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
err = got_pathlist_append(&have_refs, branchname, id);
if (err) {
free(branchname);
goto done;
}
}
}
if (asprintf(&path, "%s/%s/fetching.pack",
repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
err = got_opentemp_named_fd(&tmppackpath, &packfd, path);
free(path);
if (err)
goto done;
npackfd = dup(packfd);
if (npackfd == -1) {
err = got_error_from_errno("dup");
goto done;
}
if (asprintf(&path, "%s/%s/fetching.idx",
repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
err = got_opentemp_named_fd(&tmpidxpath, &idxfd, path);
free(path);
if (err)
goto done;
nidxfd = dup(idxfd);
if (nidxfd == -1) {
err = got_error_from_errno("dup");
goto done;
}
for (i = 0; i < nitems(tmpfds); i++) {
tmpfds[i] = got_opentempfd();
if (tmpfds[i] == -1) {
err = got_error_from_errno("got_opentempfd");
goto done;
}
}
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fetchfds) == -1) {
err = got_error_from_errno("socketpair");
goto done;
}
fetchpid = fork();
if (fetchpid == -1) {
err = got_error_from_errno("fork");
goto done;
} else if (fetchpid == 0){
got_privsep_exec_child(imsg_fetchfds,
GOT_PATH_PROG_FETCH_PACK, tmppackpath);
}
if (close(imsg_fetchfds[1]) != 0) {
err = got_error_from_errno("close");
goto done;
}
imsg_init(&fetchibuf, imsg_fetchfds[0]);
nfetchfd = dup(fetchfd);
if (nfetchfd == -1) {
err = got_error_from_errno("dup");
goto done;
}
err = got_privsep_send_fetch_req(&fetchibuf, nfetchfd, &have_refs);
if (err != NULL)
goto done;
nfetchfd = -1;
err = got_privsep_send_fetch_outfd(&fetchibuf, npackfd);
if (err != NULL)
goto done;
npackfd = dup(packfd);
if (npackfd == -1) {
err = got_error_from_errno("dup");
goto done;
}
packfile_size = 0;
while (!done) {
struct got_object_id *id = NULL;
char *refname = NULL;
char *server_progress = NULL;
off_t packfile_size_cur = 0;
err = got_privsep_recv_fetch_progress(&done,
&id, &refname, symrefs, &server_progress,
&packfile_size_cur, &fetchibuf);
if (err != NULL)
goto done;
if (done) {
if (packfile_size > 0)
*pack_hash = id;
else
free(id);
}
else if (refname && id) {
err = got_pathlist_append(refs, refname, id);
if (err)
goto done;
} else if (server_progress) {
char *s, *s0 = server_progress;
while ((s = strsep(&s0, "\r")) != NULL) {
if (*s == '\0')
continue;
err = progress_cb(progress_arg, s,
packfile_size_cur, 0, 0, 0, 0);
if (err)
break;
}
free(server_progress);
if (err)
goto done;
} else if (packfile_size_cur != packfile_size) {
err = progress_cb(progress_arg, NULL,
packfile_size_cur, 0, 0, 0, 0);
if (err)
break;
packfile_size = packfile_size_cur;
}
}
if (waitpid(fetchpid, &fetchstatus, 0) == -1) {
err = got_error_from_errno("waitpid");
goto done;
}
/* If zero data was fetched without error we are already up-to-date. */
if (packfile_size == 0)
goto done;
if (lseek(packfd, 0, SEEK_SET) == -1) {
err = got_error_from_errno("lseek");
goto done;
}
err = check_pack_hash(packfd, packfile_size, (*pack_hash)->sha1);
if (err)
goto done;
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_idxfds) == -1) {
err = got_error_from_errno("socketpair");
goto done;
}
idxpid = fork();
if (idxpid == -1) {
err= got_error_from_errno("fork");
goto done;
} else if (idxpid == 0)
got_privsep_exec_child(imsg_idxfds,
GOT_PATH_PROG_INDEX_PACK, tmppackpath);
if (close(imsg_idxfds[1]) != 0) {
err = got_error_from_errno("close");
goto done;
}
imsg_init(&idxibuf, imsg_idxfds[0]);
err = got_privsep_send_index_pack_req(&idxibuf, (*pack_hash)->sha1,
npackfd);
if (err != NULL)
goto done;
npackfd = -1;
err = got_privsep_send_index_pack_outfd(&idxibuf, nidxfd);
if (err != NULL)
goto done;
nidxfd = -1;
for (i = 0; i < nitems(tmpfds); i++) {
err = got_privsep_send_tmpfd(&idxibuf, tmpfds[i]);
if (err != NULL)
goto done;
tmpfds[i] = -1;
}
done = 0;
while (!done) {
int nobj_total, nobj_indexed, nobj_loose, nobj_resolved;
err = got_privsep_recv_index_progress(&done, &nobj_total,
&nobj_indexed, &nobj_loose, &nobj_resolved,
&idxibuf);
if (err != NULL)
goto done;
if (nobj_indexed != 0) {
err = progress_cb(progress_arg, NULL,
packfile_size, nobj_total,
nobj_indexed, nobj_loose, nobj_resolved);
if (err)
break;
}
imsg_clear(&idxibuf);
}
if (close(imsg_idxfds[0]) == -1) {
err = got_error_from_errno("close");
goto done;
}
if (waitpid(idxpid, &idxstatus, 0) == -1) {
err = got_error_from_errno("waitpid");
goto done;
}
err = got_object_id_str(&id_str, *pack_hash);
if (err)
goto done;
if (asprintf(&packpath, "%s/%s/pack-%s.pack",
repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
if (asprintf(&idxpath, "%s/%s/pack-%s.idx",
repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
err = got_error_from_errno("asprintf");
goto done;
}
if (rename(tmppackpath, packpath) == -1) {
err = got_error_from_errno3("rename", tmppackpath, packpath);
goto done;
}
free(tmppackpath);
tmppackpath = NULL;
if (rename(tmpidxpath, idxpath) == -1) {
err = got_error_from_errno3("rename", tmpidxpath, idxpath);
goto done;
}
free(tmpidxpath);
tmpidxpath = NULL;
done:
if (tmppackpath && unlink(tmppackpath) == -1 && err == NULL)
err = got_error_from_errno2("unlink", tmppackpath);
if (tmpidxpath && unlink(tmpidxpath) == -1 && err == NULL)
err = got_error_from_errno2("unlink", tmpidxpath);
if (nfetchfd != -1 && close(nfetchfd) == -1 && err == NULL)
err = got_error_from_errno("close");
if (npackfd != -1 && close(npackfd) == -1 && err == NULL)
err = got_error_from_errno("close");
if (packfd != -1 && close(packfd) == -1 && err == NULL)
err = got_error_from_errno("close");
if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
err = got_error_from_errno("close");
for (i = 0; i < nitems(tmpfds); i++) {
if (tmpfds[i] != -1 && close(tmpfds[i]) == -1 && err == NULL)
err = got_error_from_errno("close");
}
free(tmppackpath);
free(tmpidxpath);
free(idxpath);
free(packpath);
free(ref_prefix);
TAILQ_FOREACH(pe, &have_refs, entry) {
free((char *)pe->path);
free(pe->data);
}
got_pathlist_free(&have_refs);
got_ref_list_free(&my_refs);
if (err) {
free(*pack_hash);
*pack_hash = NULL;
TAILQ_FOREACH(pe, refs, entry) {
free((void *)pe->path);
free(pe->data);
}
got_pathlist_free(refs);
TAILQ_FOREACH(pe, symrefs, entry) {
free((void *)pe->path);
free(pe->data);
}
got_pathlist_free(symrefs);
}
return err;
}
