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postgres/src/bin/psql/command.c
Tom Lane 8468146b03 Fix the inadvertent libpq ABI breakage discovered by Martin Pitt: the 
renumbering of encoding IDs done between 8.2 and 8.3 turns out to break 8.2
initdb and psql if they are run with an 8.3beta1 libpq.so.  For the moment
we can rearrange the order of enum pg_enc to keep the same number for
everything except PG_JOHAB, which isn't a problem since there are no direct
references to it in the 8.2 programs anyway.  (This does force initdb
unfortunately.)

Going forward, we want to fix things so that encoding IDs can be changed
without an ABI break, and this commit includes the changes needed to allow
libpq's encoding IDs to be treated as fully independent of the backend's.
The main issue is that libpq clients should not include pg_wchar.h or
otherwise assume they know the specific values of libpq's encoding IDs,
since they might encounter version skew between pg_wchar.h and the libpq.so
they are using.  To fix, have libpq officially export functions needed for
encoding name<=>ID conversion and validity checking; it was doing this
anyway unofficially.

It's still the case that we can't renumber backend encoding IDs until the
next bump in libpq's major version number, since doing so will break the
8.2-era client programs.  However the code is now prepared to avoid this
type of problem in future.

Note that initdb is no longer a libpq client: we just pull in the two
source files we need directly.  The patch also fixes a few places that
were being sloppy about checking for an unrecognized encoding name.
2007-10-13 20:18:42 +00:00

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/*
* psql - the PostgreSQL interactive terminal
*
* Copyright (c) 2000-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/bin/psql/command.c,v 1.182 2007/10/13 20:18:41 tgl Exp $
*/
#include "postgres_fe.h"
#include "command.h"
#ifdef __BORLANDC__ /* needed for BCC */
#undef mkdir
#endif
#include <ctype.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifndef WIN32
#include <sys/types.h> /* for umask() */
#include <sys/stat.h> /* for stat() */
#include <fcntl.h> /* open() flags */
#include <unistd.h> /* for geteuid(), getpid(), stat() */
#else
#include <win32.h>
#include <io.h>
#include <fcntl.h>
#include <direct.h>
#include <sys/types.h> /* for umask() */
#include <sys/stat.h> /* for stat() */
#endif
#include "libpq-fe.h"
#include "pqexpbuffer.h"
#include "dumputils.h"
#include "common.h"
#include "copy.h"
#include "describe.h"
#include "help.h"
#include "input.h"
#include "large_obj.h"
#include "mainloop.h"
#include "print.h"
#include "psqlscan.h"
#include "settings.h"
#include "variables.h"
/* functions for use in this file */
static backslashResult exec_command(const char *cmd,
PsqlScanState scan_state,
PQExpBuffer query_buf);
static bool do_edit(const char *filename_arg, PQExpBuffer query_buf);
static bool do_connect(char *dbname, char *user, char *host, char *port);
static bool do_shell(const char *command);
/*----------
* HandleSlashCmds:
*
* Handles all the different commands that start with '\'.
* Ordinarily called by MainLoop().
*
* scan_state is a lexer working state that is set to continue scanning
* just after the '\'. The lexer is advanced past the command and all
* arguments on return.
*
* 'query_buf' contains the query-so-far, which may be modified by
* execution of the backslash command (for example, \r clears it).
* query_buf can be NULL if there is no query so far.
*
* Returns a status code indicating what action is desired, see command.h.
*----------
*/
backslashResult
HandleSlashCmds(PsqlScanState scan_state,
PQExpBuffer query_buf)
{
backslashResult status = PSQL_CMD_SKIP_LINE;
char *cmd;
char *arg;
psql_assert(scan_state);
/* Parse off the command name */
cmd = psql_scan_slash_command(scan_state);
/* And try to execute it */
status = exec_command(cmd, scan_state, query_buf);
if (status == PSQL_CMD_UNKNOWN && strlen(cmd) > 1)
{
/*
* If the command was not recognized, try to parse it as a one-letter
* command with immediately following argument (a still-supported, but
* no longer encouraged, syntax).
*/
char new_cmd[2];
/* don't change cmd until we know it's okay */
new_cmd[0] = cmd[0];
new_cmd[1] = '\0';
psql_scan_slash_pushback(scan_state, cmd + 1);
status = exec_command(new_cmd, scan_state, query_buf);
if (status != PSQL_CMD_UNKNOWN)
{
/* adjust cmd for possible messages below */
cmd[1] = '\0';
}
}
if (status == PSQL_CMD_UNKNOWN)
{
if (pset.cur_cmd_interactive)
fprintf(stderr, _("Invalid command \\%s. Try \\? for help.\n"), cmd);
else
psql_error("invalid command \\%s\n", cmd);
status = PSQL_CMD_ERROR;
}
if (status != PSQL_CMD_ERROR)
{
/* eat any remaining arguments after a valid command */
/* note we suppress evaluation of backticks here */
while ((arg = psql_scan_slash_option(scan_state,
OT_VERBATIM, NULL, false)))
{
psql_error("\\%s: extra argument \"%s\" ignored\n", cmd, arg);
free(arg);
}
}
else
{
/* silently throw away rest of line after an erroneous command */
while ((arg = psql_scan_slash_option(scan_state,
OT_WHOLE_LINE, NULL, false)))
free(arg);
}
/* if there is a trailing \\, swallow it */
psql_scan_slash_command_end(scan_state);
free(cmd);
/* some commands write to queryFout, so make sure output is sent */
fflush(pset.queryFout);
return status;
}
/*
* Read and interpret an argument to the \connect slash command.
*/
static char *
read_connect_arg(PsqlScanState scan_state)
{
char *result;
char quote;
/*
* Ideally we should treat the arguments as SQL identifiers. But for
* backwards compatibility with 7.2 and older pg_dump files, we have to
* take unquoted arguments verbatim (don't downcase them). For now,
* double-quoted arguments may be stripped of double quotes (as if SQL
* identifiers). By 7.4 or so, pg_dump files can be expected to
* double-quote all mixed-case \connect arguments, and then we can get rid
* of OT_SQLIDHACK.
*/
result = psql_scan_slash_option(scan_state, OT_SQLIDHACK, &quote, true);
if (!result)
return NULL;
if (quote)
return result;
if (*result == '\0' || strcmp(result, "-") == 0)
return NULL;
return result;
}
/*
* Subroutine to actually try to execute a backslash command.
*/
static backslashResult
exec_command(const char *cmd,
PsqlScanState scan_state,
PQExpBuffer query_buf)
{
bool success = true; /* indicate here if the command ran ok or
* failed */
backslashResult status = PSQL_CMD_SKIP_LINE;
/*
* \a -- toggle field alignment This makes little sense but we keep it
* around.
*/
if (strcmp(cmd, "a") == 0)
{
if (pset.popt.topt.format != PRINT_ALIGNED)
success = do_pset("format", "aligned", &pset.popt, pset.quiet);
else
success = do_pset("format", "unaligned", &pset.popt, pset.quiet);
}
/* \C -- override table title (formerly change HTML caption) */
else if (strcmp(cmd, "C") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
success = do_pset("title", opt, &pset.popt, pset.quiet);
free(opt);
}
/*
* \c or \connect -- connect to database using the specified parameters.
*
* \c dbname user host port
*
* If any of these parameters are omitted or specified as '-', the current
* value of the parameter will be used instead. If the parameter has no
* current value, the default value for that parameter will be used. Some
* examples:
*
* \c - - hst Connect to current database on current port of host
* "hst" as current user. \c - usr - prt Connect to current database on
* "prt" port of current host as user "usr". \c dbs Connect to
* "dbs" database on current port of current host as current user.
*/
else if (strcmp(cmd, "c") == 0 || strcmp(cmd, "connect") == 0)
{
char *opt1,
*opt2,
*opt3,
*opt4;
opt1 = read_connect_arg(scan_state);
opt2 = read_connect_arg(scan_state);
opt3 = read_connect_arg(scan_state);
opt4 = read_connect_arg(scan_state);
success = do_connect(opt1, opt2, opt3, opt4);
free(opt1);
free(opt2);
free(opt3);
free(opt4);
}
/* \cd */
else if (strcmp(cmd, "cd") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
char *dir;
if (opt)
dir = opt;
else
{
#ifndef WIN32
struct passwd *pw;
pw = getpwuid(geteuid());
if (!pw)
{
psql_error("could not get home directory: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
dir = pw->pw_dir;
#else /* WIN32 */
/*
* On Windows, 'cd' without arguments prints the current
* directory, so if someone wants to code this here instead...
*/
dir = "/";
#endif /* WIN32 */
}
if (chdir(dir) == -1)
{
psql_error("\\%s: could not change directory to \"%s\": %s\n",
cmd, dir, strerror(errno));
success = false;
}
if (pset.dirname)
free(pset.dirname);
pset.dirname = pg_strdup(dir);
canonicalize_path(pset.dirname);
if (opt)
free(opt);
}
/* \copy */
else if (pg_strcasecmp(cmd, "copy") == 0)
{
/* Default fetch-it-all-and-print mode */
TimevalStruct before,
after;
double elapsed_msec = 0;
char *opt = psql_scan_slash_option(scan_state,
OT_WHOLE_LINE, NULL, false);
if (pset.timing)
GETTIMEOFDAY(&before);
success = do_copy(opt);
if (pset.timing && success)
{
GETTIMEOFDAY(&after);
elapsed_msec = DIFF_MSEC(&after, &before);
printf(_("Time: %.3f ms\n"), elapsed_msec);
}
free(opt);
}
/* \copyright */
else if (strcmp(cmd, "copyright") == 0)
print_copyright();
/* \d* commands */
else if (cmd[0] == 'd')
{
char *pattern;
bool show_verbose;
/* We don't do SQLID reduction on the pattern yet */
pattern = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
show_verbose = strchr(cmd, '+') ? true : false;
switch (cmd[1])
{
case '\0':
case '+':
if (pattern)
success = describeTableDetails(pattern, show_verbose);
else
/* standard listing of interesting things */
success = listTables("tvs", NULL, show_verbose);
break;
case 'a':
success = describeAggregates(pattern, show_verbose);
break;
case 'b':
success = describeTablespaces(pattern, show_verbose);
break;
case 'c':
success = listConversions(pattern);
break;
case 'C':
success = listCasts(pattern);
break;
case 'd':
success = objectDescription(pattern);
break;
case 'D':
success = listDomains(pattern);
break;
case 'f':
success = describeFunctions(pattern, show_verbose);
break;
case 'g':
/* no longer distinct from \du */
success = describeRoles(pattern, show_verbose);
break;
case 'l':
success = do_lo_list();
break;
case 'n':
success = listSchemas(pattern, show_verbose);
break;
case 'o':
success = describeOperators(pattern);
break;
case 'p':
success = permissionsList(pattern);
break;
case 'T':
success = describeTypes(pattern, show_verbose);
break;
case 't':
case 'v':
case 'i':
case 's':
case 'S':
success = listTables(&cmd[1], pattern, show_verbose);
break;
case 'u':
success = describeRoles(pattern, show_verbose);
break;
case 'F': /* text search subsystem */
switch (cmd[2])
{
case '\0':
case '+':
success = listTSConfigs(pattern, show_verbose);
break;
case 'p':
success = listTSParsers(pattern, show_verbose);
break;
case 'd':
success = listTSDictionaries(pattern, show_verbose);
break;
case 't':
success = listTSTemplates(pattern, show_verbose);
break;
default:
status = PSQL_CMD_UNKNOWN;
break;
}
break;
default:
status = PSQL_CMD_UNKNOWN;
}
if (pattern)
free(pattern);
}
/*
* \e or \edit -- edit the current query buffer (or a file and make it the
* query buffer
*/
else if (strcmp(cmd, "e") == 0 || strcmp(cmd, "edit") == 0)
{
char *fname;
if (!query_buf)
{
psql_error("no query buffer\n");
status = PSQL_CMD_ERROR;
}
else
{
fname = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
expand_tilde(&fname);
if (fname)
canonicalize_path(fname);
status = do_edit(fname, query_buf) ? PSQL_CMD_NEWEDIT : PSQL_CMD_ERROR;
free(fname);
}
}
/* \echo and \qecho */
else if (strcmp(cmd, "echo") == 0 || strcmp(cmd, "qecho") == 0)
{
char *value;
char quoted;
bool no_newline = false;
bool first = true;
FILE *fout;
if (strcmp(cmd, "qecho") == 0)
fout = pset.queryFout;
else
fout = stdout;
while ((value = psql_scan_slash_option(scan_state,
OT_NORMAL, &quoted, false)))
{
if (!quoted && strcmp(value, "-n") == 0)
no_newline = true;
else
{
if (first)
first = false;
else
fputc(' ', fout);
fputs(value, fout);
}
free(value);
}
if (!no_newline)
fputs("\n", fout);
}
/* \encoding -- set/show client side encoding */
else if (strcmp(cmd, "encoding") == 0)
{
char *encoding = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
if (!encoding)
{
/* show encoding */
puts(pg_encoding_to_char(pset.encoding));
}
else
{
/* set encoding */
if (PQsetClientEncoding(pset.db, encoding) == -1)
psql_error("%s: invalid encoding name or conversion procedure not found\n", encoding);
else
{
/* save encoding info into psql internal data */
pset.encoding = PQclientEncoding(pset.db);
pset.popt.topt.encoding = pset.encoding;
SetVariable(pset.vars, "ENCODING",
pg_encoding_to_char(pset.encoding));
}
free(encoding);
}
}
/* \f -- change field separator */
else if (strcmp(cmd, "f") == 0)
{
char *fname = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
success = do_pset("fieldsep", fname, &pset.popt, pset.quiet);
free(fname);
}
/* \g means send query */
else if (strcmp(cmd, "g") == 0)
{
char *fname = psql_scan_slash_option(scan_state,
OT_FILEPIPE, NULL, false);
if (!fname)
pset.gfname = NULL;
else
{
expand_tilde(&fname);
pset.gfname = pg_strdup(fname);
}
free(fname);
status = PSQL_CMD_SEND;
}
/* help */
else if (strcmp(cmd, "h") == 0 || strcmp(cmd, "help") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_WHOLE_LINE, NULL, false);
helpSQL(opt, pset.popt.topt.pager);
free(opt);
}
/* HTML mode */
else if (strcmp(cmd, "H") == 0 || strcmp(cmd, "html") == 0)
{
if (pset.popt.topt.format != PRINT_HTML)
success = do_pset("format", "html", &pset.popt, pset.quiet);
else
success = do_pset("format", "aligned", &pset.popt, pset.quiet);
}
/* \i is include file */
else if (strcmp(cmd, "i") == 0 || strcmp(cmd, "include") == 0)
{
char *fname = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
if (!fname)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
{
expand_tilde(&fname);
success = (process_file(fname, false) == EXIT_SUCCESS);
free(fname);
}
}
/* \l is list databases */
else if (strcmp(cmd, "l") == 0 || strcmp(cmd, "list") == 0)
success = listAllDbs(false);
else if (strcmp(cmd, "l+") == 0 || strcmp(cmd, "list+") == 0)
success = listAllDbs(true);
/*
* large object things
*/
else if (strncmp(cmd, "lo_", 3) == 0)
{
char *opt1,
*opt2;
opt1 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
opt2 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
if (strcmp(cmd + 3, "export") == 0)
{
if (!opt2)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
{
expand_tilde(&opt2);
success = do_lo_export(opt1, opt2);
}
}
else if (strcmp(cmd + 3, "import") == 0)
{
if (!opt1)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
{
expand_tilde(&opt1);
success = do_lo_import(opt1, opt2);
}
}
else if (strcmp(cmd + 3, "list") == 0)
success = do_lo_list();
else if (strcmp(cmd + 3, "unlink") == 0)
{
if (!opt1)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
success = do_lo_unlink(opt1);
}
else
status = PSQL_CMD_UNKNOWN;
free(opt1);
free(opt2);
}
/* \o -- set query output */
else if (strcmp(cmd, "o") == 0 || strcmp(cmd, "out") == 0)
{
char *fname = psql_scan_slash_option(scan_state,
OT_FILEPIPE, NULL, true);
expand_tilde(&fname);
success = setQFout(fname);
free(fname);
}
/* \p prints the current query buffer */
else if (strcmp(cmd, "p") == 0 || strcmp(cmd, "print") == 0)
{
if (query_buf && query_buf->len > 0)
puts(query_buf->data);
else if (!pset.quiet)
puts(_("Query buffer is empty."));
fflush(stdout);
}
/* \password -- set user password */
else if (strcmp(cmd, "password") == 0)
{
char *pw1;
char *pw2;
pw1 = simple_prompt("Enter new password: ", 100, false);
pw2 = simple_prompt("Enter it again: ", 100, false);
if (strcmp(pw1, pw2) != 0)
{
fprintf(stderr, _("Passwords didn't match.\n"));
success = false;
}
else
{
char *opt0 = psql_scan_slash_option(scan_state, OT_SQLID, NULL, true);
char *user;
char *encrypted_password;
if (opt0)
user = opt0;
else
user = PQuser(pset.db);
encrypted_password = PQencryptPassword(pw1, user);
if (!encrypted_password)
{
fprintf(stderr, _("Password encryption failed.\n"));
success = false;
}
else
{
PQExpBufferData buf;
PGresult *res;
initPQExpBuffer(&buf);
printfPQExpBuffer(&buf, "ALTER USER %s PASSWORD ",
fmtId(user));
appendStringLiteralConn(&buf, encrypted_password, pset.db);
res = PSQLexec(buf.data, false);
termPQExpBuffer(&buf);
if (!res)
success = false;
else
PQclear(res);
PQfreemem(encrypted_password);
}
}
free(pw1);
free(pw2);
}
/* \prompt -- prompt and set variable */
else if (strcmp(cmd, "prompt") == 0)
{
char *opt, *prompt_text = NULL;
char *arg1, *arg2;
arg1 = psql_scan_slash_option(scan_state, OT_NORMAL, NULL, false);
arg2 = psql_scan_slash_option(scan_state, OT_NORMAL, NULL, false);
if (!arg1)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
{
char *result;
if (arg2)
{
prompt_text = arg1;
opt = arg2;
}
else
opt = arg1;
if (!pset.inputfile)
result = simple_prompt(prompt_text, 4096, true);
else
{
if (prompt_text)
{
fputs(prompt_text, stdout);
fflush(stdout);
}
result = gets_fromFile(stdin);
}
if (!SetVariable(pset.vars, opt, result))
{
psql_error("\\%s: error\n", cmd);
success = false;
}
free(result);
if (prompt_text)
free(prompt_text);
free(opt);
}
}
/* \pset -- set printing parameters */
else if (strcmp(cmd, "pset") == 0)
{
char *opt0 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
char *opt1 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
if (!opt0)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
success = do_pset(opt0, opt1, &pset.popt, pset.quiet);
free(opt0);
free(opt1);
}
/* \q or \quit */
else if (strcmp(cmd, "q") == 0 || strcmp(cmd, "quit") == 0)
status = PSQL_CMD_TERMINATE;
/* reset(clear) the buffer */
else if (strcmp(cmd, "r") == 0 || strcmp(cmd, "reset") == 0)
{
resetPQExpBuffer(query_buf);
psql_scan_reset(scan_state);
if (!pset.quiet)
puts(_("Query buffer reset (cleared)."));
}
/* \s save history in a file or show it on the screen */
else if (strcmp(cmd, "s") == 0)
{
char *fname = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
expand_tilde(&fname);
/* This scrolls off the screen when using /dev/tty */
success = saveHistory(fname ? fname : DEVTTY, false);
if (success && !pset.quiet && fname)
printf(gettext("Wrote history to file \"%s/%s\".\n"),
pset.dirname ? pset.dirname : ".", fname);
if (!fname)
putchar('\n');
free(fname);
}
/* \set -- generalized set variable/option command */
else if (strcmp(cmd, "set") == 0)
{
char *opt0 = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
if (!opt0)
{
/* list all variables */
PrintVariables(pset.vars);
success = true;
}
else
{
/*
* Set variable to the concatenation of the arguments.
*/
char *newval;
char *opt;
opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
newval = pg_strdup(opt ? opt : "");
free(opt);
while ((opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false)))
{
newval = realloc(newval, strlen(newval) + strlen(opt) + 1);
if (!newval)
{
psql_error("out of memory\n");
exit(EXIT_FAILURE);
}
strcat(newval, opt);
free(opt);
}
if (!SetVariable(pset.vars, opt0, newval))
{
psql_error("\\%s: error\n", cmd);
success = false;
}
free(newval);
}
free(opt0);
}
/* \t -- turn off headers and row count */
else if (strcmp(cmd, "t") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
success = do_pset("tuples_only", opt, &pset.popt, pset.quiet);
free(opt);
}
/* \T -- define html <table ...> attributes */
else if (strcmp(cmd, "T") == 0)
{
char *value = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
success = do_pset("tableattr", value, &pset.popt, pset.quiet);
free(value);
}
/* \timing -- toggle timing of queries */
else if (strcmp(cmd, "timing") == 0)
{
pset.timing = !pset.timing;
if (!pset.quiet)
{
if (pset.timing)
puts(_("Timing is on."));
else
puts(_("Timing is off."));
}
}
/* \unset */
else if (strcmp(cmd, "unset") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, false);
if (!opt)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else if (!SetVariable(pset.vars, opt, NULL))
{
psql_error("\\%s: error\n", cmd);
success = false;
}
free(opt);
}
/* \w -- write query buffer to file */
else if (strcmp(cmd, "w") == 0 || strcmp(cmd, "write") == 0)
{
FILE *fd = NULL;
bool is_pipe = false;
char *fname = NULL;
if (!query_buf)
{
psql_error("no query buffer\n");
status = PSQL_CMD_ERROR;
}
else
{
fname = psql_scan_slash_option(scan_state,
OT_FILEPIPE, NULL, true);
expand_tilde(&fname);
if (!fname)
{
psql_error("\\%s: missing required argument\n", cmd);
success = false;
}
else
{
if (fname[0] == '|')
{
is_pipe = true;
fd = popen(&fname[1], "w");
}
else
{
canonicalize_path(fname);
fd = fopen(fname, "w");
}
if (!fd)
{
psql_error("%s: %s\n", fname, strerror(errno));
success = false;
}
}
}
if (fd)
{
int result;
if (query_buf && query_buf->len > 0)
fprintf(fd, "%s\n", query_buf->data);
if (is_pipe)
result = pclose(fd);
else
result = fclose(fd);
if (result == EOF)
{
psql_error("%s: %s\n", fname, strerror(errno));
success = false;
}
}
free(fname);
}
/* \x -- toggle expanded table representation */
else if (strcmp(cmd, "x") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
success = do_pset("expanded", opt, &pset.popt, pset.quiet);
free(opt);
}
/* \z -- list table rights (equivalent to \dp) */
else if (strcmp(cmd, "z") == 0)
{
char *pattern = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true);
success = permissionsList(pattern);
if (pattern)
free(pattern);
}
/* \! -- shell escape */
else if (strcmp(cmd, "!") == 0)
{
char *opt = psql_scan_slash_option(scan_state,
OT_WHOLE_LINE, NULL, false);
success = do_shell(opt);
free(opt);
}
/* \? -- slash command help */
else if (strcmp(cmd, "?") == 0)
slashUsage(pset.popt.topt.pager);
#if 0
/*
* These commands don't do anything. I just use them to test the parser.
*/
else if (strcmp(cmd, "void") == 0 || strcmp(cmd, "#") == 0)
{
int i = 0;
char *value;
while ((value = psql_scan_slash_option(scan_state,
OT_NORMAL, NULL, true)))
{
fprintf(stderr, "+ opt(%d) = |%s|\n", i++, value);
free(value);
}
}
#endif
else
status = PSQL_CMD_UNKNOWN;
if (!success)
status = PSQL_CMD_ERROR;
return status;
}
/*
* Ask the user for a password; 'username' is the username the
* password is for, if one has been explicitly specified. Returns a
* malloc'd string.
*/
static char *
prompt_for_password(const char *username)
{
char *result;
if (username == NULL)
result = simple_prompt("Password: ", 100, false);
else
{
char *prompt_text;
prompt_text = malloc(strlen(username) + 32);
sprintf(prompt_text, "Password for user \"%s\": ", username);
result = simple_prompt(prompt_text, 100, false);
free(prompt_text);
}
return result;
}
static bool
param_is_newly_set(const char *old_val, const char *new_val)
{
if (new_val == NULL)
return false;
if (old_val == NULL || strcmp(old_val, new_val) != 0)
return true;
return false;
}
/*
* do_connect -- handler for \connect
*
* Connects to a database with given parameters. If there exists an
* established connection, NULL values will be replaced with the ones
* in the current connection. Otherwise NULL will be passed for that
* parameter to PQsetdbLogin(), so the libpq defaults will be used.
*
* In interactive mode, if connection fails with the given parameters,
* the old connection will be kept.
*/
static bool
do_connect(char *dbname, char *user, char *host, char *port)
{
PGconn *o_conn = pset.db,
*n_conn;
char *password = NULL;
if (!dbname)
dbname = PQdb(o_conn);
if (!user)
user = PQuser(o_conn);
if (!host)
host = PQhost(o_conn);
if (!port)
port = PQport(o_conn);
/*
* If the user asked to be prompted for a password, ask for one now. If
* not, use the password from the old connection, provided the username
* has not changed. Otherwise, try to connect without a password first,
* and then ask for a password if needed.
*
* XXX: this behavior leads to spurious connection attempts recorded
* in the postmaster's log. But libpq offers no API that would let us
* obtain a password and then continue with the first connection attempt.
*/
if (pset.getPassword)
{
password = prompt_for_password(user);
}
else if (o_conn && user && strcmp(PQuser(o_conn), user) == 0)
{
password = strdup(PQpass(o_conn));
}
while (true)
{
n_conn = PQsetdbLogin(host, port, NULL, NULL,
dbname, user, password);
/* We can immediately discard the password -- no longer needed */
if (password)
free(password);
if (PQstatus(n_conn) == CONNECTION_OK)
break;
/*
* Connection attempt failed; either retry the connection attempt with
* a new password, or give up.
*/
if (!password && PQconnectionUsedPassword(n_conn))
{
PQfinish(n_conn);
password = prompt_for_password(user);
continue;
}
/*
* Failed to connect to the database. In interactive mode, keep the
* previous connection to the DB; in scripting mode, close our
* previous connection as well.
*/
if (pset.cur_cmd_interactive)
{
psql_error("%s", PQerrorMessage(n_conn));
/* pset.db is left unmodified */
if (o_conn)
fputs(_("Previous connection kept\n"), stderr);
}
else
{
psql_error("\\connect: %s", PQerrorMessage(n_conn));
if (o_conn)
{
PQfinish(o_conn);
pset.db = NULL;
}
}
PQfinish(n_conn);
return false;
}
/*
* Replace the old connection with the new one, and update
* connection-dependent variables.
*/
PQsetNoticeProcessor(n_conn, NoticeProcessor, NULL);
pset.db = n_conn;
SyncVariables();
/* Tell the user about the new connection */
if (!pset.quiet)
{
printf(_("You are now connected to database \"%s\""), PQdb(pset.db));
if (param_is_newly_set(PQhost(o_conn), PQhost(pset.db)))
printf(_(" on host \"%s\""), PQhost(pset.db));
if (param_is_newly_set(PQport(o_conn), PQport(pset.db)))
printf(_(" at port \"%s\""), PQport(pset.db));
if (param_is_newly_set(PQuser(o_conn), PQuser(pset.db)))
printf(_(" as user \"%s\""), PQuser(pset.db));
printf(".\n");
}
if (o_conn)
PQfinish(o_conn);
return true;
}
/*
* SyncVariables
*
* Make psql's internal variables agree with connection state upon
* establishing a new connection.
*/
void
SyncVariables(void)
{
/* get stuff from connection */
pset.encoding = PQclientEncoding(pset.db);
pset.popt.topt.encoding = pset.encoding;
pset.sversion = PQserverVersion(pset.db);
SetVariable(pset.vars, "DBNAME", PQdb(pset.db));
SetVariable(pset.vars, "USER", PQuser(pset.db));
SetVariable(pset.vars, "HOST", PQhost(pset.db));
SetVariable(pset.vars, "PORT", PQport(pset.db));
SetVariable(pset.vars, "ENCODING", pg_encoding_to_char(pset.encoding));
/* send stuff to it, too */
PQsetErrorVerbosity(pset.db, pset.verbosity);
}
/*
* UnsyncVariables
*
* Clear variables that should be not be set when there is no connection.
*/
void
UnsyncVariables(void)
{
SetVariable(pset.vars, "DBNAME", NULL);
SetVariable(pset.vars, "USER", NULL);
SetVariable(pset.vars, "HOST", NULL);
SetVariable(pset.vars, "PORT", NULL);
SetVariable(pset.vars, "ENCODING", NULL);
}
/*
* do_edit -- handler for \e
*
* If you do not specify a filename, the current query buffer will be copied
* into a temporary one.
*/
static bool
editFile(const char *fname)
{
const char *editorName;
char *sys;
int result;
psql_assert(fname);
/* Find an editor to use */
editorName = getenv("PSQL_EDITOR");
if (!editorName)
editorName = getenv("EDITOR");
if (!editorName)
editorName = getenv("VISUAL");
if (!editorName)
editorName = DEFAULT_EDITOR;
/*
* On Unix the EDITOR value should *not* be quoted, since it might include
* switches, eg, EDITOR="pico -t"; it's up to the user to put quotes in it
* if necessary. But this policy is not very workable on Windows, due to
* severe brain damage in their command shell plus the fact that standard
* program paths include spaces.
*/
sys = pg_malloc(strlen(editorName) + strlen(fname) + 10 + 1);
#ifndef WIN32
sprintf(sys, "exec %s '%s'", editorName, fname);
#else
sprintf(sys, "%s\"%s\" \"%s\"%s",
SYSTEMQUOTE, editorName, fname, SYSTEMQUOTE);
#endif
result = system(sys);
if (result == -1)
psql_error("could not start editor \"%s\"\n", editorName);
else if (result == 127)
psql_error("could not start /bin/sh\n");
free(sys);
return result == 0;
}
/* call this one */
static bool
do_edit(const char *filename_arg, PQExpBuffer query_buf)
{
char fnametmp[MAXPGPATH];
FILE *stream = NULL;
const char *fname;
bool error = false;
int fd;
struct stat before,
after;
if (filename_arg)
fname = filename_arg;
else
{
/* make a temp file to edit */
#ifndef WIN32
const char *tmpdir = getenv("TMPDIR");
if (!tmpdir)
tmpdir = "/tmp";
#else
char tmpdir[MAXPGPATH];
int ret;
ret = GetTempPath(MAXPGPATH, tmpdir);
if (ret == 0 || ret > MAXPGPATH)
{
psql_error("cannot locate temporary directory: %s",
!ret ? strerror(errno) : "");
return false;
}
/*
* No canonicalize_path() here. EDIT.EXE run from CMD.EXE prepends the
* current directory to the supplied path unless we use only
* backslashes, so we do that.
*/
#endif
#ifndef WIN32
snprintf(fnametmp, sizeof(fnametmp), "%s%spsql.edit.%d", tmpdir,
"/", (int) getpid());
#else
snprintf(fnametmp, sizeof(fnametmp), "%s%spsql.edit.%d", tmpdir,
"" /* trailing separator already present */ , (int) getpid());
#endif
fname = (const char *) fnametmp;
fd = open(fname, O_WRONLY | O_CREAT | O_EXCL, 0600);
if (fd != -1)
stream = fdopen(fd, "w");
if (fd == -1 || !stream)
{
psql_error("could not open temporary file \"%s\": %s\n", fname, strerror(errno));
error = true;
}
else
{
unsigned int ql = query_buf->len;
if (ql == 0 || query_buf->data[ql - 1] != '\n')
{
appendPQExpBufferChar(query_buf, '\n');
ql++;
}
if (fwrite(query_buf->data, 1, ql, stream) != ql)
{
psql_error("%s: %s\n", fname, strerror(errno));
fclose(stream);
remove(fname);
error = true;
}
else if (fclose(stream) != 0)
{
psql_error("%s: %s\n", fname, strerror(errno));
remove(fname);
error = true;
}
}
}
if (!error && stat(fname, &before) != 0)
{
psql_error("%s: %s\n", fname, strerror(errno));
error = true;
}
/* call editor */
if (!error)
error = !editFile(fname);
if (!error && stat(fname, &after) != 0)
{
psql_error("%s: %s\n", fname, strerror(errno));
error = true;
}
if (!error && before.st_mtime != after.st_mtime)
{
stream = fopen(fname, PG_BINARY_R);
if (!stream)
{
psql_error("%s: %s\n", fname, strerror(errno));
error = true;
}
else
{
/* read file back into query_buf */
char line[1024];
resetPQExpBuffer(query_buf);
while (fgets(line, sizeof(line), stream) != NULL)
appendPQExpBufferStr(query_buf, line);
if (ferror(stream))
{
psql_error("%s: %s\n", fname, strerror(errno));
error = true;
}
fclose(stream);
}
}
/* remove temp file */
if (!filename_arg)
{
if (remove(fname) == -1)
{
psql_error("%s: %s\n", fname, strerror(errno));
error = true;
}
}
return !error;
}
/*
* process_file
*
* Read commands from filename and then them to the main processing loop
* Handler for \i, but can be used for other things as well. Returns
* MainLoop() error code.
*/
int
process_file(char *filename, bool single_txn)
{
FILE *fd;
int result;
char *oldfilename;
PGresult *res;
if (!filename)
return EXIT_FAILURE;
canonicalize_path(filename);
fd = fopen(filename, PG_BINARY_R);
if (!fd)
{
psql_error("%s: %s\n", filename, strerror(errno));
return EXIT_FAILURE;
}
oldfilename = pset.inputfile;
pset.inputfile = filename;
if (single_txn)
res = PSQLexec("BEGIN", false);
result = MainLoop(fd);
if (single_txn)
res = PSQLexec("COMMIT", false);
fclose(fd);
pset.inputfile = oldfilename;
return result;
}
/*
* do_pset
*
*/
static const char *
_align2string(enum printFormat in)
{
switch (in)
{
case PRINT_NOTHING:
return "nothing";
break;
case PRINT_UNALIGNED:
return "unaligned";
break;
case PRINT_ALIGNED:
return "aligned";
break;
case PRINT_HTML:
return "html";
break;
case PRINT_LATEX:
return "latex";
break;
case PRINT_TROFF_MS:
return "troff-ms";
break;
}
return "unknown";
}
bool
do_pset(const char *param, const char *value, printQueryOpt *popt, bool quiet)
{
size_t vallen = 0;
psql_assert(param);
if (value)
vallen = strlen(value);
/* set format */
if (strcmp(param, "format") == 0)
{
if (!value)
;
else if (pg_strncasecmp("unaligned", value, vallen) == 0)
popt->topt.format = PRINT_UNALIGNED;
else if (pg_strncasecmp("aligned", value, vallen) == 0)
popt->topt.format = PRINT_ALIGNED;
else if (pg_strncasecmp("html", value, vallen) == 0)
popt->topt.format = PRINT_HTML;
else if (pg_strncasecmp("latex", value, vallen) == 0)
popt->topt.format = PRINT_LATEX;
else if (pg_strncasecmp("troff-ms", value, vallen) == 0)
popt->topt.format = PRINT_TROFF_MS;
else
{
psql_error("\\pset: allowed formats are unaligned, aligned, html, latex, troff-ms\n");
return false;
}
if (!quiet)
printf(_("Output format is %s.\n"), _align2string(popt->topt.format));
}
/* set border style/width */
else if (strcmp(param, "border") == 0)
{
if (value)
popt->topt.border = atoi(value);
if (!quiet)
printf(_("Border style is %d.\n"), popt->topt.border);
}
/* set expanded/vertical mode */
else if (strcmp(param, "x") == 0 || strcmp(param, "expanded") == 0 || strcmp(param, "vertical") == 0)
{
if (value)
popt->topt.expanded = ParseVariableBool(value);
else
popt->topt.expanded = !popt->topt.expanded;
if (!quiet)
printf(popt->topt.expanded
? _("Expanded display is on.\n")
: _("Expanded display is off.\n"));
}
/* locale-aware numeric output */
else if (strcmp(param, "numericlocale") == 0)
{
if (value)
popt->topt.numericLocale = ParseVariableBool(value);
else
popt->topt.numericLocale = !popt->topt.numericLocale;
if (!quiet)
{
if (popt->topt.numericLocale)
puts(_("Showing locale-adjusted numeric output."));
else
puts(_("Locale-adjusted numeric output is off."));
}
}
/* null display */
else if (strcmp(param, "null") == 0)
{
if (value)
{
free(popt->nullPrint);
popt->nullPrint = pg_strdup(value);
}
if (!quiet)
printf(_("Null display is \"%s\".\n"), popt->nullPrint ? popt->nullPrint : "");
}
/* field separator for unaligned text */
else if (strcmp(param, "fieldsep") == 0)
{
if (value)
{
free(popt->topt.fieldSep);
popt->topt.fieldSep = pg_strdup(value);
}
if (!quiet)
printf(_("Field separator is \"%s\".\n"), popt->topt.fieldSep);
}
/* record separator for unaligned text */
else if (strcmp(param, "recordsep") == 0)
{
if (value)
{
free(popt->topt.recordSep);
popt->topt.recordSep = pg_strdup(value);
}
if (!quiet)
{
if (strcmp(popt->topt.recordSep, "\n") == 0)
printf(_("Record separator is <newline>."));
else
printf(_("Record separator is \"%s\".\n"), popt->topt.recordSep);
}
}
/* toggle between full and tuples-only format */
else if (strcmp(param, "t") == 0 || strcmp(param, "tuples_only") == 0)
{
if (value)
popt->topt.tuples_only = ParseVariableBool(value);
else
popt->topt.tuples_only = !popt->topt.tuples_only;
if (!quiet)
{
if (popt->topt.tuples_only)
puts(_("Showing only tuples."));
else
puts(_("Tuples only is off."));
}
}
/* set title override */
else if (strcmp(param, "title") == 0)
{
free(popt->title);
if (!value)
popt->title = NULL;
else
popt->title = pg_strdup(value);
if (!quiet)
{
if (popt->title)
printf(_("Title is \"%s\".\n"), popt->title);
else
printf(_("Title is unset.\n"));
}
}
/* set HTML table tag options */
else if (strcmp(param, "T") == 0 || strcmp(param, "tableattr") == 0)
{
free(popt->topt.tableAttr);
if (!value)
popt->topt.tableAttr = NULL;
else
popt->topt.tableAttr = pg_strdup(value);
if (!quiet)
{
if (popt->topt.tableAttr)
printf(_("Table attribute is \"%s\".\n"), popt->topt.tableAttr);
else
printf(_("Table attributes unset.\n"));
}
}
/* toggle use of pager */
else if (strcmp(param, "pager") == 0)
{
if (value && pg_strcasecmp(value, "always") == 0)
popt->topt.pager = 2;
else if (value)
if (ParseVariableBool(value))
popt->topt.pager = 1;
else
popt->topt.pager = 0;
else if (popt->topt.pager == 1)
popt->topt.pager = 0;
else
popt->topt.pager = 1;
if (!quiet)
{
if (popt->topt.pager == 1)
puts(_("Pager is used for long output."));
else if (popt->topt.pager == 2)
puts(_("Pager is always used."));
else
puts(_("Pager usage is off."));
}
}
/* disable "(x rows)" footer */
else if (strcmp(param, "footer") == 0)
{
if (value)
popt->default_footer = ParseVariableBool(value);
else
popt->default_footer = !popt->default_footer;
if (!quiet)
{
if (popt->default_footer)
puts(_("Default footer is on."));
else
puts(_("Default footer is off."));
}
}
else
{
psql_error("\\pset: unknown option: %s\n", param);
return false;
}
return true;
}
#ifndef WIN32
#define DEFAULT_SHELL "/bin/sh"
#else
/*
* CMD.EXE is in different places in different Win32 releases so we
* have to rely on the path to find it.
*/
#define DEFAULT_SHELL "cmd.exe"
#endif
static bool
do_shell(const char *command)
{
int result;
if (!command)
{
char *sys;
const char *shellName;
shellName = getenv("SHELL");
#ifdef WIN32
if (shellName == NULL)
shellName = getenv("COMSPEC");
#endif
if (shellName == NULL)
shellName = DEFAULT_SHELL;
sys = pg_malloc(strlen(shellName) + 16);
#ifndef WIN32
sprintf(sys,
/* See EDITOR handling comment for an explaination */
"exec %s", shellName);
#else
sprintf(sys,
/* See EDITOR handling comment for an explaination */
"%s\"%s\"%s", SYSTEMQUOTE, shellName, SYSTEMQUOTE);
#endif
result = system(sys);
free(sys);
}
else
result = system(command);
if (result == 127 || result == -1)
{
psql_error("\\!: failed\n");
return false;
}
return true;
}
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