/* $OpenBSD$ */

/*
* Copyright (c) 2009 Nicholas Marriott <[email protected]>
*
* 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 MIND, 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 <fnmatch.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

/*
* Environment - manipulate a set of environment variables.
*/

RB_HEAD(environ, environ_entry);
static int environ_cmp(struct environ_entry *, struct environ_entry *);
RB_GENERATE_STATIC(environ, environ_entry, entry, environ_cmp);

static int
environ_cmp(struct environ_entry *envent1, struct environ_entry *envent2)
{
       return (strcmp(envent1->name, envent2->name));
}

/* Initialise the environment. */
struct environ *
environ_create(void)
{
       struct environ  *env;

       env = xcalloc(1, sizeof *env);
       RB_INIT(env);

       return (env);
}

/* Free an environment. */
void
environ_free(struct environ *env)
{
       struct environ_entry    *envent, *envent1;

       RB_FOREACH_SAFE(envent, environ, env, envent1) {
               RB_REMOVE(environ, env, envent);
               free(envent->name);
               free(envent->value);
               free(envent);
       }
       free(env);
}

struct environ_entry *
environ_first(struct environ *env)
{
       return (RB_MIN(environ, env));
}

struct environ_entry *
environ_next(struct environ_entry *envent)
{
       return (RB_NEXT(environ, env, envent));
}

/* Copy one environment into another. */
void
environ_copy(struct environ *srcenv, struct environ *dstenv)
{
       struct environ_entry    *envent;

       RB_FOREACH(envent, environ, srcenv) {
               if (envent->value == NULL)
                       environ_clear(dstenv, envent->name);
               else {
                       environ_set(dstenv, envent->name, envent->flags,
                           "%s", envent->value);
               }
       }
}

/* Find an environment variable. */
struct environ_entry *
environ_find(struct environ *env, const char *name)
{
       struct environ_entry    envent;

       envent.name = __UNCONST(name);
       return (RB_FIND(environ, env, &envent));
}

/* Set an environment variable. */
void
environ_set(struct environ *env, const char *name, int flags, const char *fmt,
   ...)
{
       struct environ_entry    *envent;
       va_list                  ap;

       va_start(ap, fmt);
       if ((envent = environ_find(env, name)) != NULL) {
               envent->flags = flags;
               free(envent->value);
               xvasprintf(&envent->value, fmt, ap);
       } else {
               envent = xmalloc(sizeof *envent);
               envent->name = xstrdup(name);
               envent->flags = flags;
               xvasprintf(&envent->value, fmt, ap);
               RB_INSERT(environ, env, envent);
       }
       va_end(ap);
}

/* Clear an environment variable. */
void
environ_clear(struct environ *env, const char *name)
{
       struct environ_entry    *envent;

       if ((envent = environ_find(env, name)) != NULL) {
               free(envent->value);
               envent->value = NULL;
       } else {
               envent = xmalloc(sizeof *envent);
               envent->name = xstrdup(name);
               envent->flags = 0;
               envent->value = NULL;
               RB_INSERT(environ, env, envent);
       }
}

/* Set an environment variable from a NAME=VALUE string. */
void
environ_put(struct environ *env, const char *var, int flags)
{
       char    *name, *value;

       value = strchr(var, '=');
       if (value == NULL)
               return;
       value++;

       name = xstrdup(var);
       name[strcspn(name, "=")] = '\0';

       environ_set(env, name, flags, "%s", value);
       free(name);
}

/* Unset an environment variable. */
void
environ_unset(struct environ *env, const char *name)
{
       struct environ_entry    *envent;

       if ((envent = environ_find(env, name)) == NULL)
               return;
       RB_REMOVE(environ, env, envent);
       free(envent->name);
       free(envent->value);
       free(envent);
}

/* Copy variables from a destination into a source environment. */
void
environ_update(struct options *oo, struct environ *src, struct environ *dst)
{
       struct environ_entry            *envent;
       struct environ_entry            *envent1;
       struct options_entry            *o;
       struct options_array_item       *a;
       union options_value             *ov;
       int                              found;

       o = options_get(oo, "update-environment");
       if (o == NULL)
               return;
       a = options_array_first(o);
       while (a != NULL) {
               ov = options_array_item_value(a);
               found = 0;
               RB_FOREACH_SAFE(envent, environ, src, envent1) {
                       if (fnmatch(ov->string, envent->name, 0) == 0) {
                               environ_set(dst, envent->name, 0, "%s", envent->value);
                               found = 1;
                       }
               }
               if (!found)
                       environ_clear(dst, ov->string);
               a = options_array_next(a);
       }
}

/* Push environment into the real environment - use after fork(). */
void
environ_push(struct environ *env)
{
       struct environ_entry    *envent;

       environ = xcalloc(1, sizeof *environ);
       RB_FOREACH(envent, environ, env) {
               if (envent->value != NULL &&
                   *envent->name != '\0' &&
                   (~envent->flags & ENVIRON_HIDDEN))
                       setenv(envent->name, envent->value, 1);
       }
}

/* Log the environment. */
void
environ_log(struct environ *env, const char *fmt, ...)
{
       struct environ_entry    *envent;
       va_list                  ap;
       char                    *prefix;

       va_start(ap, fmt);
       vasprintf(&prefix, fmt, ap);
       va_end(ap);

       RB_FOREACH(envent, environ, env) {
               if (envent->value != NULL && *envent->name != '\0') {
                       log_debug("%s%s=%s", prefix, envent->name,
                           envent->value);
               }
       }

       free(prefix);
}

/* Create initial environment for new child. */
struct environ *
environ_for_session(struct session *s, int no_TERM)
{
       struct environ  *env;
       const char      *value;
       int              idx;

       env = environ_create();
       environ_copy(global_environ, env);
       if (s != NULL)
               environ_copy(s->environ, env);

       if (!no_TERM) {
               value = options_get_string(global_options, "default-terminal");
               environ_set(env, "TERM", 0, "%s", value);
               environ_set(env, "TERM_PROGRAM", 0, "%s", "tmux");
               environ_set(env, "TERM_PROGRAM_VERSION", 0, "%s", getversion());
       }

#ifdef HAVE_SYSTEMD
       environ_clear(env, "LISTEN_PID");
       environ_clear(env, "LISTEN_FDS");
       environ_clear(env, "LISTEN_FDNAMES");
#endif

       if (s != NULL)
               idx = s->id;
       else
               idx = -1;
       environ_set(env, "TMUX", 0, "%s,%ld,%d", socket_path, (long)getpid(),
           idx);

       return (env);
}

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