diff options
Diffstat (limited to 'cmd-parse.y')
| -rw-r--r-- | cmd-parse.y | 1705 |
1 files changed, 1705 insertions, 0 deletions
diff --git a/cmd-parse.y b/cmd-parse.y new file mode 100644 index 0000000..1d69277 --- /dev/null +++ b/cmd-parse.y @@ -0,0 +1,1705 @@ +/* $OpenBSD$ */ + +/* + * Copyright (c) 2019 Nicholas Marriott <nicholas.marriott@gmail.com> + * + * 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 <ctype.h> +#include <errno.h> +#include <pwd.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <wchar.h> + +#include "tmux.h" + +static int yylex(void); +static int yyparse(void); +static int printflike(1,2) yyerror(const char *, ...); + +static char *yylex_token(int); +static char *yylex_format(void); + +struct cmd_parse_scope { + int flag; + TAILQ_ENTRY (cmd_parse_scope) entry; +}; + +enum cmd_parse_argument_type { + CMD_PARSE_STRING, + CMD_PARSE_COMMANDS, + CMD_PARSE_PARSED_COMMANDS +}; + +struct cmd_parse_argument { + enum cmd_parse_argument_type type; + char *string; + struct cmd_parse_commands *commands; + struct cmd_list *cmdlist; + + TAILQ_ENTRY(cmd_parse_argument) entry; +}; +TAILQ_HEAD(cmd_parse_arguments, cmd_parse_argument); + +struct cmd_parse_command { + u_int line; + struct cmd_parse_arguments arguments; + + TAILQ_ENTRY(cmd_parse_command) entry; +}; +TAILQ_HEAD(cmd_parse_commands, cmd_parse_command); + +struct cmd_parse_state { + FILE *f; + + const char *buf; + size_t len; + size_t off; + + int condition; + int eol; + int eof; + struct cmd_parse_input *input; + u_int escapes; + + char *error; + struct cmd_parse_commands *commands; + + struct cmd_parse_scope *scope; + TAILQ_HEAD(, cmd_parse_scope) stack; +}; +static struct cmd_parse_state parse_state; + +static char *cmd_parse_get_error(const char *, u_int, const char *); +static void cmd_parse_free_command(struct cmd_parse_command *); +static struct cmd_parse_commands *cmd_parse_new_commands(void); +static void cmd_parse_free_commands(struct cmd_parse_commands *); +static void cmd_parse_build_commands(struct cmd_parse_commands *, + struct cmd_parse_input *, struct cmd_parse_result *); +static void cmd_parse_print_commands(struct cmd_parse_input *, + struct cmd_list *); + +%} + +%union +{ + char *token; + struct cmd_parse_arguments *arguments; + struct cmd_parse_argument *argument; + int flag; + struct { + int flag; + struct cmd_parse_commands *commands; + } elif; + struct cmd_parse_commands *commands; + struct cmd_parse_command *command; +} + +%token ERROR +%token HIDDEN +%token IF +%token ELSE +%token ELIF +%token ENDIF +%token <token> FORMAT TOKEN EQUALS + +%type <token> expanded format +%type <arguments> arguments +%type <argument> argument +%type <flag> if_open if_elif +%type <elif> elif elif1 +%type <commands> argument_statements statements statement +%type <commands> commands condition condition1 +%type <command> command + +%% + +lines : /* empty */ + | statements + { + struct cmd_parse_state *ps = &parse_state; + + ps->commands = $1; + } + +statements : statement '\n' + { + $$ = $1; + } + | statements statement '\n' + { + $$ = $1; + TAILQ_CONCAT($$, $2, entry); + free($2); + } + +statement : /* empty */ + { + $$ = xmalloc (sizeof *$$); + TAILQ_INIT($$); + } + | hidden_assignment + { + $$ = xmalloc (sizeof *$$); + TAILQ_INIT($$); + } + | condition + { + struct cmd_parse_state *ps = &parse_state; + + if (ps->scope == NULL || ps->scope->flag) + $$ = $1; + else { + $$ = cmd_parse_new_commands(); + cmd_parse_free_commands($1); + } + } + | commands + { + struct cmd_parse_state *ps = &parse_state; + + if (ps->scope == NULL || ps->scope->flag) + $$ = $1; + else { + $$ = cmd_parse_new_commands(); + cmd_parse_free_commands($1); + } + } + +format : FORMAT + { + $$ = $1; + } + | TOKEN + { + $$ = $1; + } + +expanded : format + { + struct cmd_parse_state *ps = &parse_state; + struct cmd_parse_input *pi = ps->input; + struct format_tree *ft; + struct client *c = pi->c; + struct cmd_find_state *fsp; + struct cmd_find_state fs; + int flags = FORMAT_NOJOBS; + + if (cmd_find_valid_state(&pi->fs)) + fsp = &pi->fs; + else { + cmd_find_from_client(&fs, c, 0); + fsp = &fs; + } + ft = format_create(NULL, pi->item, FORMAT_NONE, flags); + format_defaults(ft, c, fsp->s, fsp->wl, fsp->wp); + + $$ = format_expand(ft, $1); + format_free(ft); + free($1); + } + +optional_assignment : /* empty */ + | assignment + +assignment : EQUALS + { + struct cmd_parse_state *ps = &parse_state; + int flags = ps->input->flags; + + if ((~flags & CMD_PARSE_PARSEONLY) && + (ps->scope == NULL || ps->scope->flag)) + environ_put(global_environ, $1, 0); + free($1); + } + +hidden_assignment : HIDDEN EQUALS + { + struct cmd_parse_state *ps = &parse_state; + int flags = ps->input->flags; + + if ((~flags & CMD_PARSE_PARSEONLY) && + (ps->scope == NULL || ps->scope->flag)) + environ_put(global_environ, $2, ENVIRON_HIDDEN); + free($2); + } + +if_open : IF expanded + { + struct cmd_parse_state *ps = &parse_state; + struct cmd_parse_scope *scope; + + scope = xmalloc(sizeof *scope); + $$ = scope->flag = format_true($2); + free($2); + + if (ps->scope != NULL) + TAILQ_INSERT_HEAD(&ps->stack, ps->scope, entry); + ps->scope = scope; + } + +if_else : ELSE + { + struct cmd_parse_state *ps = &parse_state; + struct cmd_parse_scope *scope; + + scope = xmalloc(sizeof *scope); + scope->flag = !ps->scope->flag; + + free(ps->scope); + ps->scope = scope; + } + +if_elif : ELIF expanded + { + struct cmd_parse_state *ps = &parse_state; + struct cmd_parse_scope *scope; + + scope = xmalloc(sizeof *scope); + $$ = scope->flag = format_true($2); + free($2); + + free(ps->scope); + ps->scope = scope; + } + +if_close : ENDIF + { + struct cmd_parse_state *ps = &parse_state; + + free(ps->scope); + ps->scope = TAILQ_FIRST(&ps->stack); + if (ps->scope != NULL) + TAILQ_REMOVE(&ps->stack, ps->scope, entry); + } + +condition : if_open '\n' statements if_close + { + if ($1) + $$ = $3; + else { + $$ = cmd_parse_new_commands(); + cmd_parse_free_commands($3); + } + } + | if_open '\n' statements if_else '\n' statements if_close + { + if ($1) { + $$ = $3; + cmd_parse_free_commands($6); + } else { + $$ = $6; + cmd_parse_free_commands($3); + } + } + | if_open '\n' statements elif if_close + { + if ($1) { + $$ = $3; + cmd_parse_free_commands($4.commands); + } else if ($4.flag) { + $$ = $4.commands; + cmd_parse_free_commands($3); + } else { + $$ = cmd_parse_new_commands(); + cmd_parse_free_commands($3); + cmd_parse_free_commands($4.commands); + } + } + | if_open '\n' statements elif if_else '\n' statements if_close + { + if ($1) { + $$ = $3; + cmd_parse_free_commands($4.commands); + cmd_parse_free_commands($7); + } else if ($4.flag) { + $$ = $4.commands; + cmd_parse_free_commands($3); + cmd_parse_free_commands($7); + } else { + $$ = $7; + cmd_parse_free_commands($3); + cmd_parse_free_commands($4.commands); + } + } + +elif : if_elif '\n' statements + { + if ($1) { + $$.flag = 1; + $$.commands = $3; + } else { + $$.flag = 0; + $$.commands = cmd_parse_new_commands(); + cmd_parse_free_commands($3); + } + } + | if_elif '\n' statements elif + { + if ($1) { + $$.flag = 1; + $$.commands = $3; + cmd_parse_free_commands($4.commands); + } else if ($4.flag) { + $$.flag = 1; + $$.commands = $4.commands; + cmd_parse_free_commands($3); + } else { + $$.flag = 0; + $$.commands = cmd_parse_new_commands(); + cmd_parse_free_commands($3); + cmd_parse_free_commands($4.commands); + } + } + +commands : command + { + struct cmd_parse_state *ps = &parse_state; + + $$ = cmd_parse_new_commands(); + if (!TAILQ_EMPTY(&$1->arguments) && + (ps->scope == NULL || ps->scope->flag)) + TAILQ_INSERT_TAIL($$, $1, entry); + else + cmd_parse_free_command($1); + } + | commands ';' + { + $$ = $1; + } + | commands ';' condition1 + { + $$ = $1; + TAILQ_CONCAT($$, $3, entry); + free($3); + } + | commands ';' command + { + struct cmd_parse_state *ps = &parse_state; + + if (!TAILQ_EMPTY(&$3->arguments) && + (ps->scope == NULL || ps->scope->flag)) { + $$ = $1; + TAILQ_INSERT_TAIL($$, $3, entry); + } else { + $$ = cmd_parse_new_commands(); + cmd_parse_free_commands($1); + cmd_parse_free_command($3); + } + } + | condition1 + { + $$ = $1; + } + +command : assignment + { + struct cmd_parse_state *ps = &parse_state; + + $$ = xcalloc(1, sizeof *$$); + $$->line = ps->input->line; + TAILQ_INIT(&$$->arguments); + } + | optional_assignment TOKEN + { + struct cmd_parse_state *ps = &parse_state; + struct cmd_parse_argument *arg; + + $$ = xcalloc(1, sizeof *$$); + $$->line = ps->input->line; + TAILQ_INIT(&$$->arguments); + + arg = xcalloc(1, sizeof *arg); + arg->type = CMD_PARSE_STRING; + arg->string = $2; + TAILQ_INSERT_HEAD(&$$->arguments, arg, entry); + } + | optional_assignment TOKEN arguments + { + struct cmd_parse_state *ps = &parse_state; + struct cmd_parse_argument *arg; + + $$ = xcalloc(1, sizeof *$$); + $$->line = ps->input->line; + TAILQ_INIT(&$$->arguments); + + TAILQ_CONCAT(&$$->arguments, $3, entry); + free($3); + + arg = xcalloc(1, sizeof *arg); + arg->type = CMD_PARSE_STRING; + arg->string = $2; + TAILQ_INSERT_HEAD(&$$->arguments, arg, entry); + } + +condition1 : if_open commands if_close + { + if ($1) + $$ = $2; + else { + $$ = cmd_parse_new_commands(); + cmd_parse_free_commands($2); + } + } + | if_open commands if_else commands if_close + { + if ($1) { + $$ = $2; + cmd_parse_free_commands($4); + } else { + $$ = $4; + cmd_parse_free_commands($2); + } + } + | if_open commands elif1 if_close + { + if ($1) { + $$ = $2; + cmd_parse_free_commands($3.commands); + } else if ($3.flag) { + $$ = $3.commands; + cmd_parse_free_commands($2); + } else { + $$ = cmd_parse_new_commands(); + cmd_parse_free_commands($2); + cmd_parse_free_commands($3.commands); + } + } + | if_open commands elif1 if_else commands if_close + { + if ($1) { + $$ = $2; + cmd_parse_free_commands($3.commands); + cmd_parse_free_commands($5); + } else if ($3.flag) { + $$ = $3.commands; + cmd_parse_free_commands($2); + cmd_parse_free_commands($5); + } else { + $$ = $5; + cmd_parse_free_commands($2); + cmd_parse_free_commands($3.commands); + } + } + +elif1 : if_elif commands + { + if ($1) { + $$.flag = 1; + $$.commands = $2; + } else { + $$.flag = 0; + $$.commands = cmd_parse_new_commands(); + cmd_parse_free_commands($2); + } + } + | if_elif commands elif1 + { + if ($1) { + $$.flag = 1; + $$.commands = $2; + cmd_parse_free_commands($3.commands); + } else if ($3.flag) { + $$.flag = 1; + $$.commands = $3.commands; + cmd_parse_free_commands($2); + } else { + $$.flag = 0; + $$.commands = cmd_parse_new_commands(); + cmd_parse_free_commands($2); + cmd_parse_free_commands($3.commands); + } + } + +arguments : argument + { + $$ = xcalloc(1, sizeof *$$); + TAILQ_INIT($$); + + TAILQ_INSERT_HEAD($$, $1, entry); + } + | argument arguments + { + TAILQ_INSERT_HEAD($2, $1, entry); + $$ = $2; + } + +argument : TOKEN + { + $$ = xcalloc(1, sizeof *$$); + $$->type = CMD_PARSE_STRING; + $$->string = $1; + } + | EQUALS + { + $$ = xcalloc(1, sizeof *$$); + $$->type = CMD_PARSE_STRING; + $$->string = $1; + } + | '{' argument_statements + { + $$ = xcalloc(1, sizeof *$$); + $$->type = CMD_PARSE_COMMANDS; + $$->commands = $2; + } + +argument_statements : statement '}' + { + $$ = $1; + } + | statements statement '}' + { + $$ = $1; + TAILQ_CONCAT($$, $2, entry); + free($2); + } + +%% + +static char * +cmd_parse_get_error(const char *file, u_int line, const char *error) +{ + char *s; + + if (file == NULL) + s = xstrdup(error); + else + xasprintf(&s, "%s:%u: %s", file, line, error); + return (s); +} + +static void +cmd_parse_print_commands(struct cmd_parse_input *pi, struct cmd_list *cmdlist) +{ + char *s; + + if (pi->item == NULL || (~pi->flags & CMD_PARSE_VERBOSE)) + return; + s = cmd_list_print(cmdlist, 0); + if (pi->file != NULL) + cmdq_print(pi->item, "%s:%u: %s", pi->file, pi->line, s); + else + cmdq_print(pi->item, "%u: %s", pi->line, s); + free(s); +} + +static void +cmd_parse_free_argument(struct cmd_parse_argument *arg) +{ + switch (arg->type) { + case CMD_PARSE_STRING: + free(arg->string); + break; + case CMD_PARSE_COMMANDS: + cmd_parse_free_commands(arg->commands); + break; + case CMD_PARSE_PARSED_COMMANDS: + cmd_list_free(arg->cmdlist); + break; + } + free(arg); +} + +static void +cmd_parse_free_arguments(struct cmd_parse_arguments *args) +{ + struct cmd_parse_argument *arg, *arg1; + + TAILQ_FOREACH_SAFE(arg, args, entry, arg1) { + TAILQ_REMOVE(args, arg, entry); + cmd_parse_free_argument(arg); + } +} + +static void +cmd_parse_free_command(struct cmd_parse_command *cmd) +{ + cmd_parse_free_arguments(&cmd->arguments); + free(cmd); +} + +static struct cmd_parse_commands * +cmd_parse_new_commands(void) +{ + struct cmd_parse_commands *cmds; + + cmds = xmalloc(sizeof *cmds); + TAILQ_INIT(cmds); + return (cmds); +} + +static void +cmd_parse_free_commands(struct cmd_parse_commands *cmds) +{ + struct cmd_parse_command *cmd, *cmd1; + + TAILQ_FOREACH_SAFE(cmd, cmds, entry, cmd1) { + TAILQ_REMOVE(cmds, cmd, entry); + cmd_parse_free_command(cmd); + } + free(cmds); +} + +static struct cmd_parse_commands * +cmd_parse_run_parser(char **cause) +{ + struct cmd_parse_state *ps = &parse_state; + struct cmd_parse_scope *scope, *scope1; + int retval; + + ps->commands = NULL; + TAILQ_INIT(&ps->stack); + + retval = yyparse(); + TAILQ_FOREACH_SAFE(scope, &ps->stack, entry, scope1) { + TAILQ_REMOVE(&ps->stack, scope, entry); + free(scope); + } + if (retval != 0) { + *cause = ps->error; + return (NULL); + } + + if (ps->commands == NULL) + return (cmd_parse_new_commands()); + return (ps->commands); +} + +static struct cmd_parse_commands * +cmd_parse_do_file(FILE *f, struct cmd_parse_input *pi, char **cause) +{ + struct cmd_parse_state *ps = &parse_state; + + memset(ps, 0, sizeof *ps); + ps->input = pi; + ps->f = f; + return (cmd_parse_run_parser(cause)); +} + +static struct cmd_parse_commands * +cmd_parse_do_buffer(const char *buf, size_t len, struct cmd_parse_input *pi, + char **cause) +{ + struct cmd_parse_state *ps = &parse_state; + + memset(ps, 0, sizeof *ps); + ps->input = pi; + ps->buf = buf; + ps->len = len; + return (cmd_parse_run_parser(cause)); +} + +static void +cmd_parse_log_commands(struct cmd_parse_commands *cmds, const char *prefix) +{ + struct cmd_parse_command *cmd; + struct cmd_parse_argument *arg; + u_int i, j; + char *s; + + i = 0; + TAILQ_FOREACH(cmd, cmds, entry) { + j = 0; + TAILQ_FOREACH(arg, &cmd->arguments, entry) { + switch (arg->type) { + case CMD_PARSE_STRING: + log_debug("%s %u:%u: %s", prefix, i, j, + arg->string); + break; + case CMD_PARSE_COMMANDS: + xasprintf(&s, "%s %u:%u", prefix, i, j); + cmd_parse_log_commands(arg->commands, s); + free(s); + break; + case CMD_PARSE_PARSED_COMMANDS: + s = cmd_list_print(arg->cmdlist, 0); + log_debug("%s %u:%u: %s", prefix, i, j, s); + free(s); + break; + } + j++; + } + i++; + } +} + +static int +cmd_parse_expand_alias(struct cmd_parse_command *cmd, + struct cmd_parse_input *pi, struct cmd_parse_result *pr) +{ + struct cmd_parse_argument *arg, *arg1, *first; + struct cmd_parse_commands *cmds; + struct cmd_parse_command *last; + char *alias, *name, *cause; + + if (pi->flags & CMD_PARSE_NOALIAS) + return (0); + memset(pr, 0, sizeof *pr); + + first = TAILQ_FIRST(&cmd->arguments); + if (first == NULL || first->type != CMD_PARSE_STRING) { + pr->status = CMD_PARSE_SUCCESS; + pr->cmdlist = cmd_list_new(); + return (1); + } + name = first->string; + + alias = cmd_get_alias(name); + if (alias == NULL) + return (0); + log_debug("%s: %u alias %s = %s", __func__, pi->line, name, alias); + + cmds = cmd_parse_do_buffer(alias, strlen(alias), pi, &cause); + free(alias); + if (cmds == NULL) { + pr->status = CMD_PARSE_ERROR; + pr->error = cause; + return (1); + } + + last = TAILQ_LAST(cmds, cmd_parse_commands); + if (last == NULL) { + pr->status = CMD_PARSE_SUCCESS; + pr->cmdlist = cmd_list_new(); + return (1); + } + + TAILQ_REMOVE(&cmd->arguments, first, entry); + cmd_parse_free_argument(first); + + TAILQ_FOREACH_SAFE(arg, &cmd->arguments, entry, arg1) { + TAILQ_REMOVE(&cmd->arguments, arg, entry); + TAILQ_INSERT_TAIL(&last->arguments, arg, entry); + } + cmd_parse_log_commands(cmds, __func__); + + pi->flags |= CMD_PARSE_NOALIAS; + cmd_parse_build_commands(cmds, pi, pr); + pi->flags &= ~CMD_PARSE_NOALIAS; + return (1); +} + +static void +cmd_parse_build_command(struct cmd_parse_command *cmd, + struct cmd_parse_input *pi, struct cmd_parse_result *pr) +{ + struct cmd_parse_argument *arg; + struct cmd *add; + char *cause; + struct args_value *values = NULL; + u_int count = 0, idx; + + memset(pr, 0, sizeof *pr); + + if (cmd_parse_expand_alias(cmd, pi, pr)) + return; + + TAILQ_FOREACH(arg, &cmd->arguments, entry) { + values = xrecallocarray(values, count, count + 1, + sizeof *values); + switch (arg->type) { + case CMD_PARSE_STRING: + values[count].type = ARGS_STRING; + values[count].string = xstrdup(arg->string); + break; + case CMD_PARSE_COMMANDS: + cmd_parse_build_commands(arg->commands, pi, pr); + if (pr->status != CMD_PARSE_SUCCESS) + goto out; + values[count].type = ARGS_COMMANDS; + values[count].cmdlist = pr->cmdlist; + break; + case CMD_PARSE_PARSED_COMMANDS: + values[count].type = ARGS_COMMANDS; + values[count].cmdlist = arg->cmdlist; + values[count].cmdlist->references++; + break; + } + count++; + } + + add = cmd_parse(values, count, pi->file, pi->line, &cause); + if (add == NULL) { + pr->status = CMD_PARSE_ERROR; + pr->error = cmd_parse_get_error(pi->file, pi->line, cause); + free(cause); + goto out; + } + pr->status = CMD_PARSE_SUCCESS; + pr->cmdlist = cmd_list_new(); + cmd_list_append(pr->cmdlist, add); + +out: + for (idx = 0; idx < count; idx++) + args_free_value(&values[idx]); + free(values); +} + +static void +cmd_parse_build_commands(struct cmd_parse_commands *cmds, + struct cmd_parse_input *pi, struct cmd_parse_result *pr) +{ + struct cmd_parse_command *cmd; + u_int line = UINT_MAX; + struct cmd_list *current = NULL, *result; + char *s; + + memset(pr, 0, sizeof *pr); + + /* Check for an empty list. */ + if (TAILQ_EMPTY(cmds)) { + pr->status = CMD_PARSE_SUCCESS; + pr->cmdlist = cmd_list_new(); + return; + } + cmd_parse_log_commands(cmds, __func__); + + /* + * Parse each command into a command list. Create a new command list + * for each line (unless the flag is set) so they get a new group (so + * the queue knows which ones to remove if a command fails when + * executed). + */ + result = cmd_list_new(); + TAILQ_FOREACH(cmd, cmds, entry) { + if (((~pi->flags & CMD_PARSE_ONEGROUP) && cmd->line != line)) { + if (current != NULL) { + cmd_parse_print_commands(pi, current); + cmd_list_move(result, current); + cmd_list_free(current); + } + current = cmd_list_new(); + } + if (current == NULL) + current = cmd_list_new(); + line = pi->line = cmd->line; + + cmd_parse_build_command(cmd, pi, pr); + if (pr->status != CMD_PARSE_SUCCESS) { + cmd_list_free(result); + cmd_list_free(current); + return; + } + cmd_list_append_all(current, pr->cmdlist); + cmd_list_free(pr->cmdlist); + } + if (current != NULL) { + cmd_parse_print_commands(pi, current); + cmd_list_move(result, current); + cmd_list_free(current); + } + + s = cmd_list_print(result, 0); + log_debug("%s: %s", __func__, s); + free(s); + + pr->status = CMD_PARSE_SUCCESS; + pr->cmdlist = result; +} + +struct cmd_parse_result * +cmd_parse_from_file(FILE *f, struct cmd_parse_input *pi) +{ + static struct cmd_parse_result pr; + struct cmd_parse_input input; + struct cmd_parse_commands *cmds; + char *cause; + + if (pi == NULL) { + memset(&input, 0, sizeof input); + pi = &input; + } + memset(&pr, 0, sizeof pr); + + cmds = cmd_parse_do_file(f, pi, &cause); + if (cmds == NULL) { + pr.status = CMD_PARSE_ERROR; + pr.error = cause; + return (&pr); + } + cmd_parse_build_commands(cmds, pi, &pr); + cmd_parse_free_commands(cmds); + return (&pr); + +} + +struct cmd_parse_result * +cmd_parse_from_string(const char *s, struct cmd_parse_input *pi) +{ + struct cmd_parse_input input; + + if (pi == NULL) { + memset(&input, 0, sizeof input); + pi = &input; + } + + /* + * When parsing a string, put commands in one group even if there are + * multiple lines. This means { a \n b } is identical to "a ; b" when + * given as an argument to another command. + */ + pi->flags |= CMD_PARSE_ONEGROUP; + return (cmd_parse_from_buffer(s, strlen(s), pi)); +} + +enum cmd_parse_status +cmd_parse_and_insert(const char *s, struct cmd_parse_input *pi, + struct cmdq_item *after, struct cmdq_state *state, char **error) +{ + struct cmd_parse_result *pr; + struct cmdq_item *item; + + pr = cmd_parse_from_string(s, pi); + switch (pr->status) { + case CMD_PARSE_ERROR: + if (error != NULL) + *error = pr->error; + else + free(pr->error); + break; + case CMD_PARSE_SUCCESS: + item = cmdq_get_command(pr->cmdlist, state); + cmdq_insert_after(after, item); + cmd_list_free(pr->cmdlist); + break; + } + return (pr->status); +} + +enum cmd_parse_status +cmd_parse_and_append(const char *s, struct cmd_parse_input *pi, + struct client *c, struct cmdq_state *state, char **error) +{ + struct cmd_parse_result *pr; + struct cmdq_item *item; + + pr = cmd_parse_from_string(s, pi); + switch (pr->status) { + case CMD_PARSE_ERROR: + if (error != NULL) + *error = pr->error; + else + free(pr->error); + break; + case CMD_PARSE_SUCCESS: + item = cmdq_get_command(pr->cmdlist, state); + cmdq_append(c, item); + cmd_list_free(pr->cmdlist); + break; + } + return (pr->status); +} + +struct cmd_parse_result * +cmd_parse_from_buffer(const void *buf, size_t len, struct cmd_parse_input *pi) +{ + static struct cmd_parse_result pr; + struct cmd_parse_input input; + struct cmd_parse_commands *cmds; + char *cause; + + if (pi == NULL) { + memset(&input, 0, sizeof input); + pi = &input; + } + memset(&pr, 0, sizeof pr); + + if (len == 0) { + pr.status = CMD_PARSE_SUCCESS; + pr.cmdlist = cmd_list_new(); + return (&pr); + } + + cmds = cmd_parse_do_buffer(buf, len, pi, &cause); + if (cmds == NULL) { + pr.status = CMD_PARSE_ERROR; + pr.error = cause; + return (&pr); + } + cmd_parse_build_commands(cmds, pi, &pr); + cmd_parse_free_commands(cmds); + return (&pr); +} + +struct cmd_parse_result * +cmd_parse_from_arguments(struct args_value *values, u_int count, + struct cmd_parse_input *pi) +{ + static struct cmd_parse_result pr; + struct cmd_parse_input input; + struct cmd_parse_commands *cmds; + struct cmd_parse_command *cmd; + struct cmd_parse_argument *arg; + u_int i; + char *copy; + size_t size; + int end; + + /* + * The commands are already split up into arguments, so just separate + * into a set of commands by ';'. + */ + + if (pi == NULL) { + memset(&input, 0, sizeof input); + pi = &input; + } + memset(&pr, 0, sizeof pr); + + cmds = cmd_parse_new_commands(); + + cmd = xcalloc(1, sizeof *cmd); + cmd->line = pi->line; + TAILQ_INIT(&cmd->arguments); + + for (i = 0; i < count; i++) { + end = 0; + if (values[i].type == ARGS_STRING) { + copy = xstrdup(values[i].string); + size = strlen(copy); + if (size != 0 && copy[size - 1] == ';') { + copy[--size] = '\0'; + if (size > 0 && copy[size - 1] == '\\') + copy[size - 1] = ';'; + else + end = 1; + } + if (!end || size != 0) { + arg = xcalloc(1, sizeof *arg); + arg->type = CMD_PARSE_STRING; + arg->string = copy; + TAILQ_INSERT_TAIL(&cmd->arguments, arg, entry); + } + } else if (values[i].type == ARGS_COMMANDS) { + arg = xcalloc(1, sizeof *arg); + arg->type = CMD_PARSE_PARSED_COMMANDS; + arg->cmdlist = values[i].cmdlist; + arg->cmdlist->references++; + TAILQ_INSERT_TAIL(&cmd->arguments, arg, entry); + } else + fatalx("unknown argument type"); + if (end) { + TAILQ_INSERT_TAIL(cmds, cmd, entry); + cmd = xcalloc(1, sizeof *cmd); + cmd->line = pi->line; + TAILQ_INIT(&cmd->arguments); + } + } + if (!TAILQ_EMPTY(&cmd->arguments)) + TAILQ_INSERT_TAIL(cmds, cmd, entry); + else + free(cmd); + + cmd_parse_build_commands(cmds, pi, &pr); + cmd_parse_free_commands(cmds); + return (&pr); +} + +static int printflike(1, 2) +yyerror(const char *fmt, ...) +{ + struct cmd_parse_state *ps = &parse_state; + struct cmd_parse_input *pi = ps->input; + va_list ap; + char *error; + + if (ps->error != NULL) + return (0); + + va_start(ap, fmt); + xvasprintf(&error, fmt, ap); + va_end(ap); + + ps->error = cmd_parse_get_error(pi->file, pi->line, error); + free(error); + return (0); +} + +static int +yylex_is_var(char ch, int first) +{ + if (ch == '=') + return (0); + if (first && isdigit((u_char)ch)) + return (0); + return (isalnum((u_char)ch) || ch == '_'); +} + +static void +yylex_append(char **buf, size_t *len, const char *add, size_t addlen) +{ + if (addlen > SIZE_MAX - 1 || *len > SIZE_MAX - 1 - addlen) + fatalx("buffer is too big"); + *buf = xrealloc(*buf, (*len) + 1 + addlen); + memcpy((*buf) + *len, add, addlen); + (*len) += addlen; +} + +static void +yylex_append1(char **buf, size_t *len, char add) +{ + yylex_append(buf, len, &add, 1); +} + +static int +yylex_getc1(void) +{ + struct cmd_parse_state *ps = &parse_state; + int ch; + + if (ps->f != NULL) + ch = getc(ps->f); + else { + if (ps->off == ps->len) + ch = EOF; + else + ch = ps->buf[ps->off++]; + } + return (ch); +} + +static void +yylex_ungetc(int ch) +{ + struct cmd_parse_state *ps = &parse_state; + + if (ps->f != NULL) + ungetc(ch, ps->f); + else if (ps->off > 0 && ch != EOF) + ps->off--; +} + +static int +yylex_getc(void) +{ + struct cmd_parse_state *ps = &parse_state; + int ch; + + if (ps->escapes != 0) { + ps->escapes--; + return ('\\'); + } + for (;;) { + ch = yylex_getc1(); + if (ch == '\\') { + ps->escapes++; + continue; + } + if (ch == '\n' && (ps->escapes % 2) == 1) { + ps->input->line++; + ps->escapes--; + continue; + } + + if (ps->escapes != 0) { + yylex_ungetc(ch); + ps->escapes--; + return ('\\'); + } + return (ch); + } +} + +static char * +yylex_get_word(int ch) +{ + char *buf; + size_t len; + + len = 0; + buf = xmalloc(1); + + do + yylex_append1(&buf, &len, ch); + while ((ch = yylex_getc()) != EOF && strchr(" \t\n", ch) == NULL); + yylex_ungetc(ch); + + buf[len] = '\0'; + log_debug("%s: %s", __func__, buf); + return (buf); +} + +static int +yylex(void) +{ + struct cmd_parse_state *ps = &parse_state; + char *token, *cp; + int ch, next, condition; + + if (ps->eol) + ps->input->line++; + ps->eol = 0; + + condition = ps->condition; + ps->condition = 0; + + for (;;) { + ch = yylex_getc(); + + if (ch == EOF) { + /* + * Ensure every file or string is terminated by a + * newline. This keeps the parser simpler and avoids + * having to add a newline to each string. + */ + if (ps->eof) + break; + ps->eof = 1; + return ('\n'); + } + + if (ch == ' ' || ch == '\t') { + /* + * Ignore whitespace. + */ + continue; + } + + if (ch == '\n') { + /* + * End of line. Update the line number. + */ + ps->eol = 1; + return ('\n'); + } + + if (ch == ';' || ch == '{' || ch == '}') { + /* + * A semicolon or { or } is itself. + */ + return (ch); + } + + if (ch == '#') { + /* + * #{ after a condition opens a format; anything else + * is a comment, ignore up to the end of the line. + */ + next = yylex_getc(); + if (condition && next == '{') { + yylval.token = yylex_format(); + if (yylval.token == NULL) + return (ERROR); + return (FORMAT); + } + while (next != '\n' && next != EOF) + next = yylex_getc(); + if (next == '\n') { + ps->input->line++; + return ('\n'); + } + continue; + } + + if (ch == '%') { + /* + * % is a condition unless it is all % or all numbers, + * then it is a token. + */ + yylval.token = yylex_get_word('%'); + for (cp = yylval.token; *cp != '\0'; cp++) { + if (*cp != '%' && !isdigit((u_char)*cp)) + break; + } + if (*cp == '\0') + return (TOKEN); + ps->condition = 1; + if (strcmp(yylval.token, "%hidden") == 0) { + free(yylval.token); + return (HIDDEN); + } + if (strcmp(yylval.token, "%if") == 0) { + free(yylval.token); + return (IF); + } + if (strcmp(yylval.token, "%else") == 0) { + free(yylval.token); + return (ELSE); + } + if (strcmp(yylval.token, "%elif") == 0) { + free(yylval.token); + return (ELIF); + } + if (strcmp(yylval.token, "%endif") == 0) { + free(yylval.token); + return (ENDIF); + } + free(yylval.token); + return (ERROR); + } + + /* + * Otherwise this is a token. + */ + token = yylex_token(ch); + if (token == NULL) + return (ERROR); + yylval.token = token; + + if (strchr(token, '=') != NULL && yylex_is_var(*token, 1)) { + for (cp = token + 1; *cp != '='; cp++) { + if (!yylex_is_var(*cp, 0)) + break; + } + if (*cp == '=') + return (EQUALS); + } + return (TOKEN); + } + return (0); +} + +static char * +yylex_format(void) +{ + char *buf; + size_t len; + int ch, brackets = 1; + + len = 0; + buf = xmalloc(1); + + yylex_append(&buf, &len, "#{", 2); + for (;;) { + if ((ch = yylex_getc()) == EOF || ch == '\n') + goto error; + if (ch == '#') { + if ((ch = yylex_getc()) == EOF || ch == '\n') + goto error; + if (ch == '{') + brackets++; + yylex_append1(&buf, &len, '#'); + } else if (ch == '}') { + if (brackets != 0 && --brackets == 0) { + yylex_append1(&buf, &len, ch); + break; + } + } + yylex_append1(&buf, &len, ch); + } + if (brackets != 0) + goto error; + + buf[len] = '\0'; + log_debug("%s: %s", __func__, buf); + return (buf); + +error: + free(buf); + return (NULL); +} + +static int +yylex_token_escape(char **buf, size_t *len) +{ + int ch, type, o2, o3, mlen; + u_int size, i, tmp; + char s[9], m[MB_LEN_MAX]; + + ch = yylex_getc(); + + if (ch >= '4' && ch <= '7') { + yyerror("invalid octal escape"); + return (0); + } + if (ch >= '0' && ch <= '3') { + o2 = yylex_getc(); + if (o2 >= '0' && o2 <= '7') { + o3 = yylex_getc(); + if (o3 >= '0' && o3 <= '7') { + ch = 64 * (ch - '0') + + 8 * (o2 - '0') + + (o3 - '0'); + yylex_append1(buf, len, ch); + return (1); + } + } + yyerror("invalid octal escape"); + return (0); + } + + switch (ch) { + case EOF: + return (0); + case 'a': + ch = '\a'; + break; + case 'b': + ch = '\b'; + break; + case 'e': + ch = '\033'; + break; + case 'f': + ch = '\f'; + break; + case 's': + ch = ' '; + break; + case 'v': + ch = '\v'; + break; + case 'r': + ch = '\r'; + break; + case 'n': + ch = '\n'; + break; + case 't': + ch = '\t'; + break; + case 'u': + type = 'u'; + size = 4; + goto unicode; + case 'U': + type = 'U'; + size = 8; + goto unicode; + } + + yylex_append1(buf, len, ch); + return (1); + +unicode: + for (i = 0; i < size; i++) { + ch = yylex_getc(); + if (ch == EOF || ch == '\n') + return (0); + if (!isxdigit((u_char)ch)) { + yyerror("invalid \\%c argument", type); + return (0); + } + s[i] = ch; + } + s[i] = '\0'; + + if ((size == 4 && sscanf(s, "%4x", &tmp) != 1) || + (size == 8 && sscanf(s, "%8x", &tmp) != 1)) { + yyerror("invalid \\%c argument", type); + return (0); + } + mlen = wctomb(m, tmp); + if (mlen <= 0 || mlen > (int)sizeof m) { + yyerror("invalid \\%c argument", type); + return (0); + } + yylex_append(buf, len, m, mlen); + return (1); +} + +static int +yylex_token_variable(char **buf, size_t *len) +{ + struct environ_entry *envent; + int ch, brackets = 0; + char name[1024]; + size_t namelen = 0; + const char *value; + + ch = yylex_getc(); + if (ch == EOF) + return (0); + if (ch == '{') + brackets = 1; + else { + if (!yylex_is_var(ch, 1)) { + yylex_append1(buf, len, '$'); + yylex_ungetc(ch); + return (1); + } + name[namelen++] = ch; + } + + for (;;) { + ch = yylex_getc(); + if (brackets && ch == '}') + break; + if (ch == EOF || !yylex_is_var(ch, 0)) { + if (!brackets) { + yylex_ungetc(ch); + break; + } + yyerror("invalid environment variable"); + return (0); + } + if (namelen == (sizeof name) - 2) { + yyerror("environment variable is too long"); + return (0); + } + name[namelen++] = ch; + } + name[namelen] = '\0'; + + envent = environ_find(global_environ, name); + if (envent != NULL && envent->value != NULL) { + value = envent->value; + log_debug("%s: %s -> %s", __func__, name, value); + yylex_append(buf, len, value, strlen(value)); + } + return (1); +} + +static int +yylex_token_tilde(char **buf, size_t *len) +{ + struct environ_entry *envent; + int ch; + char name[1024]; + size_t namelen = 0; + struct passwd *pw; + const char *home = NULL; + + for (;;) { + ch = yylex_getc(); + if (ch == EOF || strchr("/ \t\n\"'", ch) != NULL) { + yylex_ungetc(ch); + break; + } + if (namelen == (sizeof name) - 2) { + yyerror("user name is too long"); + return (0); + } + name[namelen++] = ch; + } + name[namelen] = '\0'; + + if (*name == '\0') { + envent = environ_find(global_environ, "HOME"); + if (envent != NULL && *envent->value != '\0') + home = envent->value; + else if ((pw = getpwuid(getuid())) != NULL) + home = pw->pw_dir; + } else { + if ((pw = getpwnam(name)) != NULL) + home = pw->pw_dir; + } + if (home == NULL) + return (0); + + log_debug("%s: ~%s -> %s", __func__, name, home); + yylex_append(buf, len, home, strlen(home)); + return (1); +} + +static char * +yylex_token(int ch) +{ + char *buf; + size_t len; + enum { START, + NONE, + DOUBLE_QUOTES, + SINGLE_QUOTES } state = NONE, last = START; + + len = 0; + buf = xmalloc(1); + + for (;;) { + /* EOF or \n are always the end of the token. */ + if (ch == EOF || (state == NONE && ch == '\n')) + break; + + /* Whitespace or ; or } ends a token unless inside quotes. */ + if ((ch == ' ' || ch == '\t' || ch == ';' || ch == '}') && + state == NONE) + break; + + /* + * Spaces and comments inside quotes after \n are removed but + * the \n is left. + */ + if (ch == '\n' && state != NONE) { + yylex_append1(&buf, &len, '\n'); + while ((ch = yylex_getc()) == ' ' || ch == '\t') + /* nothing */; + if (ch != '#') + continue; + ch = yylex_getc(); + if (strchr(",#{}:", ch) != NULL) { + yylex_ungetc(ch); + ch = '#'; + } else { + while ((ch = yylex_getc()) != '\n' && ch != EOF) + /* nothing */; + } + continue; + } + + /* \ ~ and $ are expanded except in single quotes. */ + if (ch == '\\' && state != SINGLE_QUOTES) { + if (!yylex_token_escape(&buf, &len)) + goto error; + goto skip; + } + if (ch == '~' && last != state && state != SINGLE_QUOTES) { + if (!yylex_token_tilde(&buf, &len)) + goto error; + goto skip; + } + if (ch == '$' && state != SINGLE_QUOTES) { + if (!yylex_token_variable(&buf, &len)) + goto error; + goto skip; + } + if (ch == '}' && state == NONE) + goto error; /* unmatched (matched ones were handled) */ + + /* ' and " starts or end quotes (and is consumed). */ + if (ch == '\'') { + if (state == NONE) { + state = SINGLE_QUOTES; + goto next; + } + if (state == SINGLE_QUOTES) { + state = NONE; + goto next; + } + } + if (ch == '"') { + if (state == NONE) { + state = DOUBLE_QUOTES; + goto next; + } + if (state == DOUBLE_QUOTES) { + state = NONE; + goto next; + } + } + + /* Otherwise add the character to the buffer. */ + yylex_append1(&buf, &len, ch); + + skip: + last = state; + + next: + ch = yylex_getc(); + } + yylex_ungetc(ch); + + buf[len] = '\0'; + log_debug("%s: %s", __func__, buf); + return (buf); + +error: + free(buf); + return (NULL); +} |