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/*
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* A fast client for Mercurial command server
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*
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* Copyright (c) 2011 Yuya Nishihara <yuya@tcha.org>
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2 or any later version.
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*/
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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#include "hgclient.h"
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#include "procutil.h"
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#include "util.h"
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#ifndef PATH_MAX
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#define PATH_MAX 4096
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#endif
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struct cmdserveropts {
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char sockname[PATH_MAX];
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char initsockname[PATH_MAX];
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char redirectsockname[PATH_MAX];
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size_t argsize;
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const char **args;
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};
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static void initcmdserveropts(struct cmdserveropts *opts)
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{
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memset(opts, 0, sizeof(struct cmdserveropts));
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}
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static void freecmdserveropts(struct cmdserveropts *opts)
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{
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free(opts->args);
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opts->args = NULL;
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opts->argsize = 0;
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}
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/*
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* Test if an argument is a sensitive flag that should be passed to the server.
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* Return 0 if not, otherwise the number of arguments starting from the current
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* one that should be passed to the server.
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*/
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static size_t testsensitiveflag(const char *arg)
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{
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static const struct {
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const char *name;
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size_t narg;
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} flags[] = {
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{"--config", 1}, {"--cwd", 1}, {"--repo", 1},
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{"--repository", 1}, {"--traceback", 0}, {"-R", 1},
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};
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size_t i;
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for (i = 0; i < sizeof(flags) / sizeof(flags[0]); ++i) {
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size_t len = strlen(flags[i].name);
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size_t narg = flags[i].narg;
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if (memcmp(arg, flags[i].name, len) == 0) {
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if (arg[len] == '\0') {
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/* --flag (value) */
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return narg + 1;
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} else if (arg[len] == '=' && narg > 0) {
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/* --flag=value */
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return 1;
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} else if (flags[i].name[1] != '-') {
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/* short flag */
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return 1;
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}
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}
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}
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return 0;
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}
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/*
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* Parse argv[] and put sensitive flags to opts->args
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*/
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static void setcmdserverargs(struct cmdserveropts *opts, int argc,
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const char *argv[])
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{
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size_t i, step;
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opts->argsize = 0;
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for (i = 0, step = 1; i < (size_t)argc; i += step, step = 1) {
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if (!argv[i])
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continue; /* pass clang-analyse */
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if (strcmp(argv[i], "--") == 0)
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break;
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size_t n = testsensitiveflag(argv[i]);
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if (n == 0 || i + n > (size_t)argc)
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continue;
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opts->args =
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reallocx(opts->args, (n + opts->argsize) * sizeof(char *));
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memcpy(opts->args + opts->argsize, argv + i,
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sizeof(char *) * n);
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opts->argsize += n;
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step = n;
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}
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}
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static void preparesockdir(const char *sockdir)
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{
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int r;
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r = mkdir(sockdir, 0700);
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if (r < 0 && errno != EEXIST)
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abortmsgerrno("cannot create sockdir %s", sockdir);
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struct stat st;
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r = lstat(sockdir, &st);
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if (r < 0)
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abortmsgerrno("cannot stat %s", sockdir);
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if (!S_ISDIR(st.st_mode))
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abortmsg("cannot create sockdir %s (file exists)", sockdir);
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if (st.st_uid != geteuid() || st.st_mode & 0077)
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abortmsg("insecure sockdir %s", sockdir);
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}
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/*
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* Check if a socket directory exists and is only owned by the current user.
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* Return 1 if so, 0 if not. This is used to check if XDG_RUNTIME_DIR can be
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* used or not. According to the specification [1], XDG_RUNTIME_DIR should be
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* ignored if the directory is not owned by the user with mode 0700.
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* [1]: https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
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*/
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static int checkruntimedir(const char *sockdir)
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{
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struct stat st;
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int r = lstat(sockdir, &st);
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if (r < 0) /* ex. does not exist */
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return 0;
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if (!S_ISDIR(st.st_mode)) /* ex. is a file, not a directory */
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return 0;
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return st.st_uid == geteuid() && (st.st_mode & 0777) == 0700;
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}
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static void getdefaultsockdir(char sockdir[], size_t size)
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{
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/* by default, put socket file in secure directory
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* (${XDG_RUNTIME_DIR}/chg, or /${TMPDIR:-tmp}/chg$UID)
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* (permission of socket file may be ignored on some Unices) */
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const char *runtimedir = getenv("XDG_RUNTIME_DIR");
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int r;
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if (runtimedir && checkruntimedir(runtimedir)) {
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r = snprintf(sockdir, size, "%s/chg", runtimedir);
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} else {
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const char *tmpdir = getenv("TMPDIR");
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if (!tmpdir)
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tmpdir = "/tmp";
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r = snprintf(sockdir, size, "%s/chg%d", tmpdir, geteuid());
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}
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if (r < 0 || (size_t)r >= size)
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abortmsg("too long TMPDIR (r = %d)", r);
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}
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static void setcmdserveropts(struct cmdserveropts *opts)
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{
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int r;
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char sockdir[PATH_MAX];
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const char *envsockname = getenv("CHGSOCKNAME");
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if (!envsockname) {
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getdefaultsockdir(sockdir, sizeof(sockdir));
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preparesockdir(sockdir);
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}
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const char *basename = (envsockname) ? envsockname : sockdir;
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const char *sockfmt = (envsockname) ? "%s" : "%s/server";
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r = snprintf(opts->sockname, sizeof(opts->sockname), sockfmt, basename);
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if (r < 0 || (size_t)r >= sizeof(opts->sockname))
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abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r);
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r = snprintf(opts->initsockname, sizeof(opts->initsockname), "%s.%u",
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opts->sockname, (unsigned)getpid());
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if (r < 0 || (size_t)r >= sizeof(opts->initsockname))
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abortmsg("too long TMPDIR or CHGSOCKNAME (r = %d)", r);
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}
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/* If the current program is, say, /a/b/c/chg, returns /a/b/c/hg. */
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static char *getrelhgcmd(void)
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{
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ssize_t n;
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char *res, *slash;
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int maxsize = 4096;
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res = malloc(maxsize);
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if (res == NULL)
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goto cleanup;
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n = readlink("/proc/self/exe", res, maxsize);
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if (n < 0 || n >= maxsize)
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goto cleanup;
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res[n] = '\0';
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slash = strrchr(res, '/');
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if (slash == NULL)
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goto cleanup;
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/* 4 is strlen("/hg") + nul byte */
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if (slash + 4 >= res + maxsize)
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goto cleanup;
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memcpy(slash, "/hg", 4);
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return res;
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cleanup:
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free(res);
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return NULL;
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}
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static const char *gethgcmd(void)
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{
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static const char *hgcmd = NULL;
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#ifdef HGPATHREL
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int tryrelhgcmd = 1;
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#else
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int tryrelhgcmd = 0;
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#endif
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if (!hgcmd) {
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hgcmd = getenv("CHGHG");
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if (!hgcmd || hgcmd[0] == '\0')
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hgcmd = getenv("HG");
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if (tryrelhgcmd && (!hgcmd || hgcmd[0] == '\0'))
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hgcmd = getrelhgcmd();
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if (!hgcmd || hgcmd[0] == '\0')
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#ifdef HGPATH
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hgcmd = (HGPATH);
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#else
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hgcmd = "hg";
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#endif
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}
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return hgcmd;
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}
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static void execcmdserver(const struct cmdserveropts *opts)
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{
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const char *hgcmd = gethgcmd();
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const char *baseargv[] = {
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hgcmd,
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"serve",
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"--cmdserver",
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"chgunix",
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"--address",
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opts->initsockname,
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"--daemon-postexec",
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"chdir:/",
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};
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size_t baseargvsize = sizeof(baseargv) / sizeof(baseargv[0]);
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size_t argsize = baseargvsize + opts->argsize + 1;
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const char **argv = mallocx(sizeof(char *) * argsize);
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memcpy(argv, baseargv, sizeof(baseargv));
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if (opts->args) {
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size_t size = sizeof(char *) * opts->argsize;
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memcpy(argv + baseargvsize, opts->args, size);
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}
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argv[argsize - 1] = NULL;
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const char *lc_ctype_env = getenv("LC_CTYPE");
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if (lc_ctype_env == NULL) {
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if (putenv("CHG_CLEAR_LC_CTYPE=") != 0)
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abortmsgerrno("failed to putenv CHG_CLEAR_LC_CTYPE");
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} else {
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if (setenv("CHGORIG_LC_CTYPE", lc_ctype_env, 1) != 0) {
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abortmsgerrno("failed to setenv CHGORIG_LC_CTYPE");
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}
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}
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/* close any open files to avoid hanging locks */
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DIR *dp = opendir("/proc/self/fd");
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if (dp != NULL) {
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debugmsg("closing files based on /proc contents");
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struct dirent *de;
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while ((de = readdir(dp))) {
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char *end;
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long fd_value = strtol(de->d_name, &end, 10);
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if (end == de->d_name) {
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/* unable to convert to int (. or ..) */
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continue;
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}
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if (errno == ERANGE) {
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debugmsg("tried to parse %s, but range error "
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"occurred",
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de->d_name);
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continue;
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}
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if (fd_value > STDERR_FILENO && fd_value != dirfd(dp)) {
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debugmsg("closing fd %ld", fd_value);
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int res = close(fd_value);
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if (res) {
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debugmsg("tried to close fd %ld: %d "
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"(errno: %d)",
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fd_value, res, errno);
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}
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}
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}
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closedir(dp);
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}
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if (putenv("CHGINTERNALMARK=") != 0)
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abortmsgerrno("failed to putenv");
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if (execvp(hgcmd, (char **)argv) < 0)
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abortmsgerrno("failed to exec cmdserver");
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free(argv);
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}
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/* Retry until we can connect to the server. Give up after some time. */
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static hgclient_t *retryconnectcmdserver(struct cmdserveropts *opts, pid_t pid)
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{
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static const struct timespec sleepreq = {0, 10 * 1000000};
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int pst = 0;
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debugmsg("try connect to %s repeatedly", opts->initsockname);
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unsigned int timeoutsec = 60; /* default: 60 seconds */
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const char *timeoutenv = getenv("CHGTIMEOUT");
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if (timeoutenv)
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sscanf(timeoutenv, "%u", &timeoutsec);
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for (unsigned int i = 0; !timeoutsec || i < timeoutsec * 100; i++) {
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hgclient_t *hgc = hgc_open(opts->initsockname);
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if (hgc) {
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debugmsg("rename %s to %s", opts->initsockname,
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opts->sockname);
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int r = rename(opts->initsockname, opts->sockname);
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if (r != 0)
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abortmsgerrno("cannot rename");
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return hgc;
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}
|
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|
|
|
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if (pid > 0) {
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/* collect zombie if child process fails to start */
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int r = waitpid(pid, &pst, WNOHANG);
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if (r != 0)
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goto cleanup;
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}
|
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|
|
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nanosleep(&sleepreq, NULL);
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}
|
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|
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abortmsg("timed out waiting for cmdserver %s", opts->initsockname);
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return NULL;
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|
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cleanup:
|
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if (WIFEXITED(pst)) {
|
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if (WEXITSTATUS(pst) == 0)
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abortmsg("could not connect to cmdserver "
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|
"(exited with status 0)");
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debugmsg("cmdserver exited with status %d", WEXITSTATUS(pst));
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exit(WEXITSTATUS(pst));
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} else if (WIFSIGNALED(pst)) {
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abortmsg("cmdserver killed by signal %d", WTERMSIG(pst));
|
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} else {
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abortmsg("error while waiting for cmdserver");
|
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}
|
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return NULL;
|
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}
|
|
|
|
|
|
/* Connect to a cmdserver. Will start a new server on demand. */
|
|
|
static hgclient_t *connectcmdserver(struct cmdserveropts *opts)
|
|
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{
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|
|
const char *sockname =
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opts->redirectsockname[0] ? opts->redirectsockname : opts->sockname;
|
|
|
debugmsg("try connect to %s", sockname);
|
|
|
hgclient_t *hgc = hgc_open(sockname);
|
|
|
if (hgc)
|
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|
return hgc;
|
|
|
|
|
|
/* prevent us from being connected to an outdated server: we were
|
|
|
* told by a server to redirect to opts->redirectsockname and that
|
|
|
* address does not work. we do not want to connect to the server
|
|
|
* again because it will probably tell us the same thing. */
|
|
|
if (sockname == opts->redirectsockname)
|
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|
unlink(opts->sockname);
|
|
|
|
|
|
debugmsg("start cmdserver at %s", opts->initsockname);
|
|
|
|
|
|
pid_t pid = fork();
|
|
|
if (pid < 0)
|
|
|
abortmsg("failed to fork cmdserver process");
|
|
|
if (pid == 0) {
|
|
|
execcmdserver(opts);
|
|
|
} else {
|
|
|
hgc = retryconnectcmdserver(opts, pid);
|
|
|
}
|
|
|
|
|
|
return hgc;
|
|
|
}
|
|
|
|
|
|
static void killcmdserver(const struct cmdserveropts *opts)
|
|
|
{
|
|
|
/* resolve config hash */
|
|
|
char *resolvedpath = realpath(opts->sockname, NULL);
|
|
|
if (resolvedpath) {
|
|
|
unlink(resolvedpath);
|
|
|
free(resolvedpath);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/* Run instructions sent from the server like unlink and set redirect path
|
|
|
* Return 1 if reconnect is needed, otherwise 0 */
|
|
|
static int runinstructions(struct cmdserveropts *opts, const char **insts)
|
|
|
{
|
|
|
int needreconnect = 0;
|
|
|
if (!insts)
|
|
|
return needreconnect;
|
|
|
|
|
|
assert(insts);
|
|
|
opts->redirectsockname[0] = '\0';
|
|
|
const char **pinst;
|
|
|
for (pinst = insts; *pinst; pinst++) {
|
|
|
debugmsg("instruction: %s", *pinst);
|
|
|
if (strncmp(*pinst, "unlink ", 7) == 0) {
|
|
|
unlink(*pinst + 7);
|
|
|
} else if (strncmp(*pinst, "redirect ", 9) == 0) {
|
|
|
int r = snprintf(opts->redirectsockname,
|
|
|
sizeof(opts->redirectsockname), "%s",
|
|
|
*pinst + 9);
|
|
|
if (r < 0 || r >= (int)sizeof(opts->redirectsockname))
|
|
|
abortmsg("redirect path is too long (%d)", r);
|
|
|
needreconnect = 1;
|
|
|
} else if (strncmp(*pinst, "exit ", 5) == 0) {
|
|
|
int n = 0;
|
|
|
if (sscanf(*pinst + 5, "%d", &n) != 1)
|
|
|
abortmsg("cannot read the exit code");
|
|
|
exit(n);
|
|
|
} else if (strcmp(*pinst, "reconnect") == 0) {
|
|
|
needreconnect = 1;
|
|
|
} else {
|
|
|
abortmsg("unknown instruction: %s", *pinst);
|
|
|
}
|
|
|
}
|
|
|
return needreconnect;
|
|
|
}
|
|
|
|
|
|
/*
|
|
|
* Test whether the command and the environment is unsupported or not.
|
|
|
*
|
|
|
* If any of the stdio file descriptors are not present (rare, but some tools
|
|
|
* might spawn new processes without stdio instead of redirecting them to the
|
|
|
* null device), then mark it as not supported because attachio won't work
|
|
|
* correctly.
|
|
|
*
|
|
|
* The command list is not designed to cover all cases. But it's fast, and does
|
|
|
* not depend on the server.
|
|
|
*/
|
|
|
static int isunsupported(int argc, const char *argv[])
|
|
|
{
|
|
|
enum { SERVE = 1,
|
|
|
DAEMON = 2,
|
|
|
SERVEDAEMON = SERVE | DAEMON,
|
|
|
};
|
|
|
unsigned int state = 0;
|
|
|
int i;
|
|
|
/* use fcntl to test missing stdio fds */
|
|
|
if (fcntl(STDIN_FILENO, F_GETFD) == -1 ||
|
|
|
fcntl(STDOUT_FILENO, F_GETFD) == -1 ||
|
|
|
fcntl(STDERR_FILENO, F_GETFD) == -1) {
|
|
|
debugmsg("stdio fds are missing");
|
|
|
return 1;
|
|
|
}
|
|
|
for (i = 0; i < argc; ++i) {
|
|
|
if (strcmp(argv[i], "--") == 0)
|
|
|
break;
|
|
|
/*
|
|
|
* there can be false positives but no false negative
|
|
|
* we cannot assume `serve` will always be first argument
|
|
|
* because global options can be passed before the command name
|
|
|
*/
|
|
|
if (strcmp("serve", argv[i]) == 0)
|
|
|
state |= SERVE;
|
|
|
else if (strcmp("-d", argv[i]) == 0 ||
|
|
|
strcmp("--daemon", argv[i]) == 0)
|
|
|
state |= DAEMON;
|
|
|
}
|
|
|
return (state & SERVEDAEMON) == SERVEDAEMON;
|
|
|
}
|
|
|
|
|
|
static void execoriginalhg(const char *argv[])
|
|
|
{
|
|
|
debugmsg("execute original hg");
|
|
|
if (execvp(gethgcmd(), (char **)argv) < 0)
|
|
|
abortmsgerrno("failed to exec original hg");
|
|
|
}
|
|
|
|
|
|
int main(int argc, const char *argv[], const char *envp[])
|
|
|
{
|
|
|
if (getenv("CHGDEBUG"))
|
|
|
enabledebugmsg();
|
|
|
|
|
|
if (!getenv("HGPLAIN") && isatty(fileno(stderr)))
|
|
|
enablecolor();
|
|
|
|
|
|
if (getenv("CHGINTERNALMARK"))
|
|
|
abortmsg("chg started by chg detected.\n"
|
|
|
"Please make sure ${HG:-hg} is not a symlink or "
|
|
|
"wrapper to chg. Alternatively, set $CHGHG to the "
|
|
|
"path of real hg.");
|
|
|
|
|
|
if (isunsupported(argc - 1, argv + 1))
|
|
|
execoriginalhg(argv);
|
|
|
|
|
|
struct cmdserveropts opts;
|
|
|
initcmdserveropts(&opts);
|
|
|
setcmdserveropts(&opts);
|
|
|
setcmdserverargs(&opts, argc, argv);
|
|
|
|
|
|
if (argc == 2) {
|
|
|
if (strcmp(argv[1], "--kill-chg-daemon") == 0) {
|
|
|
killcmdserver(&opts);
|
|
|
return 0;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
hgclient_t *hgc;
|
|
|
size_t retry = 0;
|
|
|
while (1) {
|
|
|
hgc = connectcmdserver(&opts);
|
|
|
if (!hgc)
|
|
|
abortmsg("cannot open hg client");
|
|
|
hgc_setenv(hgc, envp);
|
|
|
const char **insts = hgc_validate(hgc, argv + 1, argc - 1);
|
|
|
int needreconnect = runinstructions(&opts, insts);
|
|
|
free(insts);
|
|
|
if (!needreconnect)
|
|
|
break;
|
|
|
hgc_close(hgc);
|
|
|
if (++retry > 10)
|
|
|
abortmsg("too many redirections.\n"
|
|
|
"Please make sure %s is not a wrapper which "
|
|
|
"changes sensitive environment variables "
|
|
|
"before executing hg. If you have to use a "
|
|
|
"wrapper, wrap chg instead of hg.",
|
|
|
gethgcmd());
|
|
|
}
|
|
|
|
|
|
setupsignalhandler(hgc_peerpid(hgc), hgc_peerpgid(hgc));
|
|
|
atexit(waitpager);
|
|
|
int exitcode = hgc_runcommand(hgc, argv + 1, argc - 1);
|
|
|
restoresignalhandler();
|
|
|
hgc_close(hgc);
|
|
|
freecmdserveropts(&opts);
|
|
|
|
|
|
return exitcode;
|
|
|
}
|
|
|
|