1 /* $OpenBSD: misc.h,v 1.107 2024/03/04 02:16:11 djm Exp $ */ 2 3 /* 4 * Author: Tatu Ylonen <ylo@cs.hut.fi> 5 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 6 * All rights reserved 7 * 8 * As far as I am concerned, the code I have written for this software 9 * can be used freely for any purpose. Any derived versions of this 10 * software must be clearly marked as such, and if the derived work is 11 * incompatible with the protocol description in the RFC file, it must be 12 * called by a name other than "ssh" or "Secure Shell". 13 */ 14 15 #ifndef _MISC_H 16 #define _MISC_H 17 18 #include <sys/time.h> 19 #include <sys/types.h> 20 #include <sys/socket.h> 21 #include <stdio.h> 22 #include <signal.h> 23 24 /* Data structure for representing a forwarding request. */ 25 struct Forward { 26 char *listen_host; /* Host (address) to listen on. */ 27 int listen_port; /* Port to forward. */ 28 char *listen_path; /* Path to bind domain socket. */ 29 char *connect_host; /* Host to connect. */ 30 int connect_port; /* Port to connect on connect_host. */ 31 char *connect_path; /* Path to connect domain socket. */ 32 int allocated_port; /* Dynamically allocated listen port */ 33 int handle; /* Handle for dynamic listen ports */ 34 }; 35 36 int forward_equals(const struct Forward *, const struct Forward *); 37 int daemonized(void); 38 39 /* Common server and client forwarding options. */ 40 struct ForwardOptions { 41 int gateway_ports; /* Allow remote connects to forwarded ports. */ 42 mode_t streamlocal_bind_mask; /* umask for streamlocal binds */ 43 int streamlocal_bind_unlink; /* unlink socket before bind */ 44 }; 45 46 /* misc.c */ 47 48 char *chop(char *); 49 void rtrim(char *); 50 void skip_space(char **); 51 char *strdelim(char **); 52 char *strdelimw(char **); 53 int set_nonblock(int); 54 int unset_nonblock(int); 55 void set_nodelay(int); 56 int set_reuseaddr(int); 57 char *get_rdomain(int); 58 int set_rdomain(int, const char *); 59 int get_sock_af(int); 60 void set_sock_tos(int, int); 61 int waitrfd(int, int *, volatile sig_atomic_t *); 62 int timeout_connect(int, const struct sockaddr *, socklen_t, int *); 63 int a2port(const char *); 64 int a2tun(const char *, int *); 65 char *put_host_port(const char *, u_short); 66 char *hpdelim2(char **, char *); 67 char *hpdelim(char **); 68 char *cleanhostname(char *); 69 char *colon(char *); 70 int parse_user_host_path(const char *, char **, char **, char **); 71 int parse_user_host_port(const char *, char **, char **, int *); 72 int parse_uri(const char *, const char *, char **, char **, int *, char **); 73 int convtime(const char *); 74 const char *fmt_timeframe(time_t t); 75 int tilde_expand(const char *, uid_t, char **); 76 char *tilde_expand_filename(const char *, uid_t); 77 78 char *dollar_expand(int *, const char *string, ...); 79 char *percent_expand(const char *, ...) __attribute__((__sentinel__)); 80 char *percent_dollar_expand(const char *, ...) __attribute__((__sentinel__)); 81 char *tohex(const void *, size_t); 82 void xextendf(char **s, const char *sep, const char *fmt, ...) 83 __attribute__((__format__ (printf, 3, 4))) __attribute__((__nonnull__ (3))); 84 void sanitise_stdfd(void); 85 void ms_subtract_diff(struct timeval *, int *); 86 void ms_to_timespec(struct timespec *, int); 87 void monotime_ts(struct timespec *); 88 void monotime_tv(struct timeval *); 89 time_t monotime(void); 90 double monotime_double(void); 91 void lowercase(char *s); 92 int unix_listener(const char *, int, int); 93 int valid_domain(char *, int, const char **); 94 int valid_env_name(const char *); 95 const char *atoi_err(const char *, int *); 96 int parse_absolute_time(const char *, uint64_t *); 97 void format_absolute_time(uint64_t, char *, size_t); 98 int parse_pattern_interval(const char *, char **, int *); 99 int path_absolute(const char *); 100 int stdfd_devnull(int, int, int); 101 int lib_contains_symbol(const char *, const char *); 102 103 void sock_set_v6only(int); 104 105 struct passwd *pwcopy(struct passwd *); 106 const char *ssh_gai_strerror(int); 107 108 typedef void privdrop_fn(struct passwd *); 109 typedef void privrestore_fn(void); 110 #define SSH_SUBPROCESS_STDOUT_DISCARD (1) /* Discard stdout */ 111 #define SSH_SUBPROCESS_STDOUT_CAPTURE (1<<1) /* Redirect stdout */ 112 #define SSH_SUBPROCESS_STDERR_DISCARD (1<<2) /* Discard stderr */ 113 #define SSH_SUBPROCESS_UNSAFE_PATH (1<<3) /* Don't check for safe cmd */ 114 #define SSH_SUBPROCESS_PRESERVE_ENV (1<<4) /* Keep parent environment */ 115 pid_t subprocess(const char *, const char *, int, char **, FILE **, u_int, 116 struct passwd *, privdrop_fn *, privrestore_fn *); 117 118 typedef struct arglist arglist; 119 struct arglist { 120 char **list; 121 u_int num; 122 u_int nalloc; 123 }; 124 void addargs(arglist *, char *, ...) 125 __attribute__((format(printf, 2, 3))); 126 void replacearg(arglist *, u_int, char *, ...) 127 __attribute__((format(printf, 3, 4))); 128 void freeargs(arglist *); 129 130 int tun_open(int, int, char **); 131 132 /* Common definitions for ssh tunnel device forwarding */ 133 #define SSH_TUNMODE_NO 0x00 134 #define SSH_TUNMODE_POINTOPOINT 0x01 135 #define SSH_TUNMODE_ETHERNET 0x02 136 #define SSH_TUNMODE_DEFAULT SSH_TUNMODE_POINTOPOINT 137 #define SSH_TUNMODE_YES (SSH_TUNMODE_POINTOPOINT|SSH_TUNMODE_ETHERNET) 138 139 #define SSH_TUNID_ANY 0x7fffffff 140 #define SSH_TUNID_ERR (SSH_TUNID_ANY - 1) 141 #define SSH_TUNID_MAX (SSH_TUNID_ANY - 2) 142 143 /* Fake port to indicate that host field is really a path. */ 144 #define PORT_STREAMLOCAL -2 145 146 /* Functions to extract or store big-endian words of various sizes */ 147 u_int64_t get_u64(const void *) 148 __attribute__((__bounded__( __minbytes__, 1, 8))); 149 u_int32_t get_u32(const void *) 150 __attribute__((__bounded__( __minbytes__, 1, 4))); 151 u_int16_t get_u16(const void *) 152 __attribute__((__bounded__( __minbytes__, 1, 2))); 153 void put_u64(void *, u_int64_t) 154 __attribute__((__bounded__( __minbytes__, 1, 8))); 155 void put_u32(void *, u_int32_t) 156 __attribute__((__bounded__( __minbytes__, 1, 4))); 157 void put_u16(void *, u_int16_t) 158 __attribute__((__bounded__( __minbytes__, 1, 2))); 159 160 /* Little-endian store/load, used by umac.c */ 161 u_int32_t get_u32_le(const void *) 162 __attribute__((__bounded__(__minbytes__, 1, 4))); 163 void put_u32_le(void *, u_int32_t) 164 __attribute__((__bounded__(__minbytes__, 1, 4))); 165 166 struct bwlimit { 167 size_t buflen; 168 u_int64_t rate; /* desired rate in kbit/s */ 169 u_int64_t thresh; /* threshold after which we'll check timers */ 170 u_int64_t lamt; /* amount written in last timer interval */ 171 struct timeval bwstart, bwend; 172 }; 173 174 void bandwidth_limit_init(struct bwlimit *, u_int64_t, size_t); 175 void bandwidth_limit(struct bwlimit *, size_t); 176 177 int parse_ipqos(const char *); 178 const char *iptos2str(int); 179 void mktemp_proto(char *, size_t); 180 181 void child_set_env(char ***envp, u_int *envsizep, const char *name, 182 const char *value); 183 const char *lookup_env_in_list(const char *env, 184 char * const *envs, size_t nenvs); 185 const char *lookup_setenv_in_list(const char *env, 186 char * const *envs, size_t nenvs); 187 188 int argv_split(const char *, int *, char ***, int); 189 char *argv_assemble(int, char **argv); 190 char *argv_next(int *, char ***); 191 void argv_consume(int *); 192 void argv_free(char **, int); 193 194 int exited_cleanly(pid_t, const char *, const char *, int); 195 196 struct stat; 197 int safe_path(const char *, struct stat *, const char *, uid_t, 198 char *, size_t); 199 int safe_path_fd(int, const char *, struct passwd *, 200 char *err, size_t errlen); 201 202 /* authorized_key-style options parsing helpers */ 203 int opt_flag(const char *opt, int allow_negate, const char **optsp); 204 char *opt_dequote(const char **sp, const char **errstrp); 205 int opt_match(const char **opts, const char *term); 206 207 /* readconf/servconf option lists */ 208 void opt_array_append(const char *file, const int line, 209 const char *directive, char ***array, u_int *lp, const char *s); 210 void opt_array_append2(const char *file, const int line, 211 const char *directive, char ***array, int **iarray, u_int *lp, 212 const char *s, int i); 213 void opt_array_free2(char **array, int **iarray, u_int l); 214 215 struct timespec; 216 void ptimeout_init(struct timespec *pt); 217 void ptimeout_deadline_sec(struct timespec *pt, long sec); 218 void ptimeout_deadline_ms(struct timespec *pt, long ms); 219 void ptimeout_deadline_monotime_tsp(struct timespec *pt, struct timespec *when); 220 void ptimeout_deadline_monotime(struct timespec *pt, time_t when); 221 int ptimeout_get_ms(struct timespec *pt); 222 struct timespec *ptimeout_get_tsp(struct timespec *pt); 223 int ptimeout_isset(struct timespec *pt); 224 225 /* readpass.c */ 226 227 #define RP_ECHO 0x0001 228 #define RP_ALLOW_STDIN 0x0002 229 #define RP_ALLOW_EOF 0x0004 230 #define RP_USE_ASKPASS 0x0008 231 232 struct notifier_ctx; 233 234 char *read_passphrase(const char *, int); 235 int ask_permission(const char *, ...) __attribute__((format(printf, 1, 2))); 236 struct notifier_ctx *notify_start(int, const char *, ...) 237 __attribute__((format(printf, 2, 3))); 238 void notify_complete(struct notifier_ctx *, const char *, ...) 239 __attribute__((format(printf, 2, 3))); 240 241 #define MINIMUM(a, b) (((a) < (b)) ? (a) : (b)) 242 #define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b)) 243 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y)) 244 245 typedef void (*sshsig_t)(int); 246 sshsig_t ssh_signal(int, sshsig_t); 247 248 /* On OpenBSD time_t is int64_t which is long long. */ 249 /* #define SSH_TIME_T_MAX LLONG_MAX */ 250 251 #endif /* _MISC_H */ 252