1*55bde146Snicm /* $OpenBSD: tmux.c,v 1.191 2020/01/28 10:44:30 nicm Exp $ */ 2311827fbSnicm 3311827fbSnicm /* 498ca8272Snicm * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com> 5311827fbSnicm * 6311827fbSnicm * Permission to use, copy, modify, and distribute this software for any 7311827fbSnicm * purpose with or without fee is hereby granted, provided that the above 8311827fbSnicm * copyright notice and this permission notice appear in all copies. 9311827fbSnicm * 10311827fbSnicm * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11311827fbSnicm * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12311827fbSnicm * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13311827fbSnicm * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14311827fbSnicm * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER 15311827fbSnicm * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 16311827fbSnicm * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17311827fbSnicm */ 18311827fbSnicm 19311827fbSnicm #include <sys/types.h> 20311827fbSnicm #include <sys/stat.h> 21*55bde146Snicm #include <sys/utsname.h> 22311827fbSnicm 234e7a7adeSnicm #include <err.h> 24311827fbSnicm #include <errno.h> 257724d0b0Snicm #include <event.h> 263808d149Snicm #include <fcntl.h> 273b05404cSnicm #include <langinfo.h> 28622ef518Snicm #include <locale.h> 29311827fbSnicm #include <paths.h> 30311827fbSnicm #include <pwd.h> 31311827fbSnicm #include <stdlib.h> 32311827fbSnicm #include <string.h> 335b8ac713Snicm #include <time.h> 34311827fbSnicm #include <unistd.h> 3559538115Snicm #include <util.h> 36311827fbSnicm 37311827fbSnicm #include "tmux.h" 38311827fbSnicm 39d89252e5Snicm struct options *global_options; /* server options */ 40d89252e5Snicm struct options *global_s_options; /* session options */ 41d89252e5Snicm struct options *global_w_options; /* window options */ 42fb46cb3dSnicm struct environ *global_environ; 43311827fbSnicm 448c1ade38Snicm struct timeval start_time; 459c764ad4Snicm const char *socket_path; 46b6ec3d9fSnicm int ptm_fd = -1; 47667452e4Snicm const char *shell_command; 484ccba3b3Snicm 499883b791Snicm static __dead void usage(void); 50cf04509bSnicm static char *make_label(const char *, char **); 517724d0b0Snicm 52ced21769Snicm static const char *getshell(void); 53ced21769Snicm static int checkshell(const char *); 54ced21769Snicm 559883b791Snicm static __dead void 56311827fbSnicm usage(void) 57311827fbSnicm { 586ca2ce32Ssobrado fprintf(stderr, 593da585bcSjmc "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n" 6065b1f011Snicm " [-S socket-path] [command [flags]]\n", 61d3b99136Snicm getprogname()); 62311827fbSnicm exit(1); 63311827fbSnicm } 64311827fbSnicm 65ced21769Snicm static const char * 663a5ec08bSnicm getshell(void) 673a5ec08bSnicm { 683a5ec08bSnicm struct passwd *pw; 693a5ec08bSnicm const char *shell; 703a5ec08bSnicm 713a5ec08bSnicm shell = getenv("SHELL"); 723a5ec08bSnicm if (checkshell(shell)) 733a5ec08bSnicm return (shell); 743a5ec08bSnicm 753a5ec08bSnicm pw = getpwuid(getuid()); 763a5ec08bSnicm if (pw != NULL && checkshell(pw->pw_shell)) 773a5ec08bSnicm return (pw->pw_shell); 783a5ec08bSnicm 793a5ec08bSnicm return (_PATH_BSHELL); 803a5ec08bSnicm } 813a5ec08bSnicm 82ced21769Snicm static int 833a5ec08bSnicm checkshell(const char *shell) 843a5ec08bSnicm { 85b81242d0Snicm if (shell == NULL || *shell != '/') 86a89a0ceeSnicm return (0); 87a89a0ceeSnicm if (areshell(shell)) 883a5ec08bSnicm return (0); 893a5ec08bSnicm if (access(shell, X_OK) != 0) 903a5ec08bSnicm return (0); 913a5ec08bSnicm return (1); 923a5ec08bSnicm } 933a5ec08bSnicm 943a5ec08bSnicm int 953a5ec08bSnicm areshell(const char *shell) 963a5ec08bSnicm { 973a5ec08bSnicm const char *progname, *ptr; 983a5ec08bSnicm 993a5ec08bSnicm if ((ptr = strrchr(shell, '/')) != NULL) 1003a5ec08bSnicm ptr++; 1013a5ec08bSnicm else 1023a5ec08bSnicm ptr = shell; 103d3b99136Snicm progname = getprogname(); 1043a5ec08bSnicm if (*progname == '-') 1053a5ec08bSnicm progname++; 1063a5ec08bSnicm if (strcmp(ptr, progname) == 0) 1073a5ec08bSnicm return (1); 1083a5ec08bSnicm return (0); 1093a5ec08bSnicm } 1103a5ec08bSnicm 1119c764ad4Snicm static char * 112cf04509bSnicm make_label(const char *label, char **cause) 113311827fbSnicm { 1149c764ad4Snicm char *base, resolved[PATH_MAX], *path, *s; 115311827fbSnicm struct stat sb; 116da34f2ceSnicm uid_t uid; 117cf04509bSnicm 118cf04509bSnicm *cause = NULL; 1199c764ad4Snicm 1209c764ad4Snicm if (label == NULL) 1219c764ad4Snicm label = "default"; 122311827fbSnicm uid = getuid(); 1239c764ad4Snicm 12440b64c41Snicm if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0') 1258eb95462Snicm xasprintf(&base, "%s/tmux-%ld", s, (long)uid); 12640b64c41Snicm else 127da34f2ceSnicm xasprintf(&base, "%s/tmux-%ld", _PATH_TMP, (long)uid); 128cf04509bSnicm if (realpath(base, resolved) == NULL && 129cf04509bSnicm strlcpy(resolved, base, sizeof resolved) >= sizeof resolved) { 130cf04509bSnicm errno = ERANGE; 131cf04509bSnicm free(base); 1329c764ad4Snicm goto fail; 133cf04509bSnicm } 134d09880d0Snicm free(base); 135311827fbSnicm 136cf04509bSnicm if (mkdir(resolved, S_IRWXU) != 0 && errno != EEXIST) 137cf04509bSnicm goto fail; 138cf04509bSnicm if (lstat(resolved, &sb) != 0) 1399c764ad4Snicm goto fail; 140311827fbSnicm if (!S_ISDIR(sb.st_mode)) { 141311827fbSnicm errno = ENOTDIR; 1429c764ad4Snicm goto fail; 143311827fbSnicm } 1449945ad17Snicm if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) { 145311827fbSnicm errno = EACCES; 1469c764ad4Snicm goto fail; 147311827fbSnicm } 1489c764ad4Snicm xasprintf(&path, "%s/%s", resolved, label); 149311827fbSnicm return (path); 1509c764ad4Snicm 1519c764ad4Snicm fail: 152cf04509bSnicm xasprintf(cause, "error creating %s (%s)", resolved, strerror(errno)); 1539c764ad4Snicm return (NULL); 154311827fbSnicm } 155311827fbSnicm 156a0ee4254Snicm void 157a0ee4254Snicm setblocking(int fd, int state) 158a0ee4254Snicm { 159a0ee4254Snicm int mode; 160a0ee4254Snicm 161a0ee4254Snicm if ((mode = fcntl(fd, F_GETFL)) != -1) { 162a0ee4254Snicm if (!state) 163a0ee4254Snicm mode |= O_NONBLOCK; 164a0ee4254Snicm else 165a0ee4254Snicm mode &= ~O_NONBLOCK; 166a0ee4254Snicm fcntl(fd, F_SETFL, mode); 167a0ee4254Snicm } 168a0ee4254Snicm } 169a0ee4254Snicm 170179ef399Snicm const char * 171ca2738caSnicm find_cwd(void) 172ca2738caSnicm { 173ca2738caSnicm char resolved1[PATH_MAX], resolved2[PATH_MAX]; 174ca2738caSnicm static char cwd[PATH_MAX]; 175ca2738caSnicm const char *pwd; 176ca2738caSnicm 177ca2738caSnicm if (getcwd(cwd, sizeof cwd) == NULL) 178ca2738caSnicm return (NULL); 179ca2738caSnicm if ((pwd = getenv("PWD")) == NULL || *pwd == '\0') 180ca2738caSnicm return (cwd); 181ca2738caSnicm 182ca2738caSnicm /* 183ca2738caSnicm * We want to use PWD so that symbolic links are maintained, 184ca2738caSnicm * but only if it matches the actual working directory. 185ca2738caSnicm */ 186ca2738caSnicm if (realpath(pwd, resolved1) == NULL) 187ca2738caSnicm return (cwd); 188ca2738caSnicm if (realpath(cwd, resolved2) == NULL) 189ca2738caSnicm return (cwd); 190ca2738caSnicm if (strcmp(resolved1, resolved2) != 0) 191ca2738caSnicm return (cwd); 192ca2738caSnicm return (pwd); 193ca2738caSnicm } 194ca2738caSnicm 195ca2738caSnicm const char * 196179ef399Snicm find_home(void) 197179ef399Snicm { 198179ef399Snicm struct passwd *pw; 199f038d384Snicm static const char *home; 200f038d384Snicm 201f038d384Snicm if (home != NULL) 202f038d384Snicm return (home); 203179ef399Snicm 204179ef399Snicm home = getenv("HOME"); 205179ef399Snicm if (home == NULL || *home == '\0') { 206179ef399Snicm pw = getpwuid(getuid()); 207179ef399Snicm if (pw != NULL) 208179ef399Snicm home = pw->pw_dir; 209179ef399Snicm else 210179ef399Snicm home = NULL; 211179ef399Snicm } 212179ef399Snicm 21382bdfec0Snicm return (home); 214179ef399Snicm } 215179ef399Snicm 216*55bde146Snicm const char * 217*55bde146Snicm getversion(void) 218*55bde146Snicm { 219*55bde146Snicm static char *version; 220*55bde146Snicm struct utsname u; 221*55bde146Snicm 222*55bde146Snicm if (version == NULL) { 223*55bde146Snicm if (uname(&u) < 0) 224*55bde146Snicm fatalx("uname failed"); 225*55bde146Snicm xasprintf(&version, "openbsd-%s", u.release); 226*55bde146Snicm } 227*55bde146Snicm return version; 228*55bde146Snicm } 229*55bde146Snicm 230311827fbSnicm int 231311827fbSnicm main(int argc, char **argv) 232311827fbSnicm { 233cf04509bSnicm char *path, *label, *cause, **var; 23438672859Snicm const char *s, *shell, *cwd; 2354fa31997Snicm int opt, flags, keys; 23658eb4b5dSnicm const struct options_table_entry *oe; 237311827fbSnicm 238662faea6Snicm if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL && 239662faea6Snicm setlocale(LC_CTYPE, "C.UTF-8") == NULL) { 2403b05404cSnicm if (setlocale(LC_CTYPE, "") == NULL) 2413b05404cSnicm errx(1, "invalid LC_ALL, LC_CTYPE or LANG"); 2423b05404cSnicm s = nl_langinfo(CODESET); 2435fcc80c9Snicm if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0) 2443b05404cSnicm errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s); 2453b05404cSnicm } 246f5015ed6Snicm 24731a85510Snicm setlocale(LC_TIME, ""); 2485396add0Snicm tzset(); 249622ef518Snicm 2506b014674Snicm if (**argv == '-') 2516b014674Snicm flags = CLIENT_LOGIN; 2526b014674Snicm else 2537f6133c3Snicm flags = 0; 2546b014674Snicm 25565439d22Snicm label = path = NULL; 256*55bde146Snicm while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUvV")) != -1) { 257311827fbSnicm switch (opt) { 258311827fbSnicm case '2': 259cafa7ad7Snicm flags |= CLIENT_256COLOURS; 260311827fbSnicm break; 261ef8ef121Snicm case 'c': 262667452e4Snicm shell_command = optarg; 263ef8ef121Snicm break; 26490896992Snicm case 'C': 265cafa7ad7Snicm if (flags & CLIENT_CONTROL) 266cafa7ad7Snicm flags |= CLIENT_CONTROLCONTROL; 26790896992Snicm else 268cafa7ad7Snicm flags |= CLIENT_CONTROL; 26990896992Snicm break; 270311827fbSnicm case 'f': 271f038d384Snicm set_cfg_file(optarg); 272311827fbSnicm break; 273*55bde146Snicm case 'V': 274*55bde146Snicm printf("%s %s\n", getprogname(), getversion()); 275*55bde146Snicm exit(0); 27665b1f011Snicm case 'l': 2776b014674Snicm flags |= CLIENT_LOGIN; 27865b1f011Snicm break; 279311827fbSnicm case 'L': 2807d053cf9Snicm free(label); 281311827fbSnicm label = xstrdup(optarg); 282311827fbSnicm break; 283481abfa9Snicm case 'q': 284481abfa9Snicm break; 285311827fbSnicm case 'S': 2867d053cf9Snicm free(path); 287311827fbSnicm path = xstrdup(optarg); 288311827fbSnicm break; 289311827fbSnicm case 'u': 290cafa7ad7Snicm flags |= CLIENT_UTF8; 291311827fbSnicm break; 292311827fbSnicm case 'v': 2930a607e68Snicm log_add_level(); 294311827fbSnicm break; 295311827fbSnicm default: 296311827fbSnicm usage(); 297311827fbSnicm } 298311827fbSnicm } 299311827fbSnicm argc -= optind; 300311827fbSnicm argv += optind; 301311827fbSnicm 302667452e4Snicm if (shell_command != NULL && argc != 0) 303ef8ef121Snicm usage(); 304ef8ef121Snicm 30559538115Snicm if ((ptm_fd = getptmfd()) == -1) 30659538115Snicm err(1, "getptmfd"); 307cb19d99cSnicm if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd " 308cb19d99cSnicm "recvfd proc exec tty ps", NULL) != 0) 3094e7a7adeSnicm err(1, "pledge"); 3104e7a7adeSnicm 311461e0674Snicm /* 312f6fb1232Snicm * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8. 313f6fb1232Snicm * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain 314f6fb1232Snicm * UTF-8, it is a safe assumption that either they are using a UTF-8 315f6fb1232Snicm * terminal, or if not they know that output from UTF-8-capable 316f6fb1232Snicm * programs may be wrong. 317461e0674Snicm */ 318f6fb1232Snicm if (getenv("TMUX") != NULL) 319f6fb1232Snicm flags |= CLIENT_UTF8; 320f6fb1232Snicm else { 321f6fb1232Snicm s = getenv("LC_ALL"); 322f6fb1232Snicm if (s == NULL || *s == '\0') 323f6fb1232Snicm s = getenv("LC_CTYPE"); 324f6fb1232Snicm if (s == NULL || *s == '\0') 325461e0674Snicm s = getenv("LANG"); 326f6fb1232Snicm if (s == NULL || *s == '\0') 327f6fb1232Snicm s = ""; 328f6fb1232Snicm if (strcasestr(s, "UTF-8") != NULL || 329f6fb1232Snicm strcasestr(s, "UTF8") != NULL) 330cafa7ad7Snicm flags |= CLIENT_UTF8; 331461e0674Snicm } 332461e0674Snicm 333fb46cb3dSnicm global_environ = environ_create(); 334bd0e97c4Snicm for (var = environ; *var != NULL; var++) 335fb46cb3dSnicm environ_put(global_environ, *var); 336ca2738caSnicm if ((cwd = find_cwd()) != NULL) 33738672859Snicm environ_set(global_environ, "PWD", "%s", cwd); 338bd0e97c4Snicm 339d89252e5Snicm global_options = options_create(NULL); 340d89252e5Snicm global_s_options = options_create(NULL); 341d89252e5Snicm global_w_options = options_create(NULL); 34258eb4b5dSnicm for (oe = options_table; oe->name != NULL; oe++) { 3436e0f28f8Snicm if (oe->scope & OPTIONS_TABLE_SERVER) 34458eb4b5dSnicm options_default(global_options, oe); 3456e0f28f8Snicm if (oe->scope & OPTIONS_TABLE_SESSION) 34658eb4b5dSnicm options_default(global_s_options, oe); 3476e0f28f8Snicm if (oe->scope & OPTIONS_TABLE_WINDOW) 34858eb4b5dSnicm options_default(global_w_options, oe); 34958eb4b5dSnicm } 35058eb4b5dSnicm 35158eb4b5dSnicm /* 35258eb4b5dSnicm * The default shell comes from SHELL or from the user's passwd entry 35358eb4b5dSnicm * if available. 35458eb4b5dSnicm */ 35558eb4b5dSnicm shell = getshell(); 35658eb4b5dSnicm options_set_string(global_s_options, "default-shell", 0, "%s", shell); 3573affa6cbSnicm 3583affa6cbSnicm /* Override keys to vi if VISUAL or EDITOR are set. */ 359c9347692Snicm if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) { 360c9347692Snicm if (strrchr(s, '/') != NULL) 361c9347692Snicm s = strrchr(s, '/') + 1; 362c9347692Snicm if (strstr(s, "vi") != NULL) 363c9347692Snicm keys = MODEKEY_VI; 3643affa6cbSnicm else 3653affa6cbSnicm keys = MODEKEY_EMACS; 366d89252e5Snicm options_set_number(global_s_options, "status-keys", keys); 367d89252e5Snicm options_set_number(global_w_options, "mode-keys", keys); 368c9347692Snicm } 369c9347692Snicm 3702fa50cfcSnicm /* 3719c764ad4Snicm * If socket is specified on the command-line with -S or -L, it is 3729c764ad4Snicm * used. Otherwise, $TMUX is checked and if that fails "default" is 3739c764ad4Snicm * used. 3742fa50cfcSnicm */ 3759c764ad4Snicm if (path == NULL && label == NULL) { 3764fa31997Snicm s = getenv("TMUX"); 3779c764ad4Snicm if (s != NULL && *s != '\0' && *s != ',') { 3784fa31997Snicm path = xstrdup(s); 3794fa31997Snicm path[strcspn(path, ",")] = '\0'; 3804fa31997Snicm } 3812fa50cfcSnicm } 382cf04509bSnicm if (path == NULL && (path = make_label(label, &cause)) == NULL) { 383cf04509bSnicm if (cause != NULL) { 384cf04509bSnicm fprintf(stderr, "%s\n", cause); 385cf04509bSnicm free(cause); 386cf04509bSnicm } 387311827fbSnicm exit(1); 388311827fbSnicm } 3899c764ad4Snicm socket_path = path; 3907d053cf9Snicm free(label); 3916f631021Snicm 39265439d22Snicm /* Pass control to the client. */ 393667452e4Snicm exit(client_main(event_init(), argc, argv, flags)); 394fd234c13Snicm } 395