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96 Simplify correct use of simple_prompt(). · tonybelloni/postgres@9daec77 · GitHub
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committedAug 30, 2016
Simplify correct use of simple_prompt().
The previous API for this function had it returning a malloc'd string. That meant that callers had to check for NULL return, which few of them were doing, and it also meant that callers had to remember to free() the string later, which required extra logic in most cases. Instead, make simple_prompt() write into a buffer supplied by the caller. Anywhere that the maximum required input length is reasonably small, which is almost all of the callers, we can just use a local or static array as the buffer instead of dealing with malloc/free. A fair number of callers used "pointer == NULL" as a proxy for "haven't requested the password yet". Maintaining the same behavior requires adding a separate boolean flag for that, which adds back some of the complexity we save by removing free()s. Nonetheless, this nets out at a small reduction in overall code size, and considerably less code than we would have had if we'd added the missing NULL-return checks everywhere they were needed. In passing, clean up the API comment for simple_prompt() and get rid of a very-unnecessary malloc/free in its Windows code path. This is nominally a bug fix, but it does not seem worth back-patching, because the actual risk of an OOM failure in any of these places seems pretty tiny, and all of them are client-side not server-side anyway. This patch is by me, but it owes a great deal to Michael Paquier who identified the problem and drafted a patch for fixing it the other way. Discussion: <CAB7nPqRu07Ot6iht9i9KRfYLpDaF2ZuUv5y_+72uP23ZAGysRg@mail.gmail.com>
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15 files changed

+138
-142
lines changed

15 files changed

+138
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lines changed
 

‎contrib/oid2name/oid2name.c

+6-7
Original file line numberDiff line numberDiff line change
@@ -261,7 +261,8 @@ PGconn *
261261
sql_conn(struct options * my_opts)
262262
{
263263
PGconn *conn;
264-
char *password = NULL;
264+
bool have_password = false;
265+
char password[100];
265266
bool new_pass;
266267

267268
/*
@@ -282,7 +283,7 @@ sql_conn(struct options * my_opts)
282283
keywords[2] = "user";
283284
values[2] = my_opts->username;
284285
keywords[3] = "password";
285-
values[3] = password;
286+
values[3] = have_password ? password : NULL;
286287
keywords[4] = "dbname";
287288
values[4] = my_opts->dbname;
288289
keywords[5] = "fallback_application_name";
@@ -302,17 +303,15 @@ sql_conn(struct options * my_opts)
302303

303304
if (PQstatus(conn) == CONNECTION_BAD &&
304305
PQconnectionNeedsPassword(conn) &&
305-
password == NULL)
306+
!have_password)
306307
{
307308
PQfinish(conn);
308-
password = simple_prompt("Password: ", 100, false);
309+
simple_prompt("Password: ", password, sizeof(password), false);
310+
have_password = true;
309311
new_pass = true;
310312
}
311313
} while (new_pass);
312314

313-
if (password)
314-
free(password);
315-
316315
/* check to see that the backend connection was successfully made */
317316
if (PQstatus(conn) == CONNECTION_BAD)
318317
{

‎contrib/vacuumlo/vacuumlo.c

+11-6
Original file line numberDiff line numberDiff line change
@@ -65,13 +65,17 @@ vacuumlo(const char *database, const struct _param * param)
6565
long matched;
6666
long deleted;
6767
int i;
68-
static char *password = NULL;
6968
bool new_pass;
7069
bool success = true;
70+
static bool have_password = false;
71+
static char password[100];
7172

7273
/* Note: password can be carried over from a previous call */
73-
if (param->pg_prompt == TRI_YES && password == NULL)
74-
password = simple_prompt("Password: ", 100, false);
74+
if (param->pg_prompt == TRI_YES && !have_password)
75+
{
76+
simple_prompt("Password: ", password, sizeof(password), false);
77+
have_password = true;
78+
}
7579

7680
/*
7781
* Start the connection. Loop until we have a password if requested by
@@ -91,7 +95,7 @@ vacuumlo(const char *database, const struct _param * param)
9195
keywords[2] = "user";
9296
values[2] = param->pg_user;
9397
keywords[3] = "password";
94-
values[3] = password;
98+
values[3] = have_password ? password : NULL;
9599
keywords[4] = "dbname";
96100
values[4] = database;
97101
keywords[5] = "fallback_application_name";
@@ -110,11 +114,12 @@ vacuumlo(const char *database, const struct _param * param)
110114

111115
if (PQstatus(conn) == CONNECTION_BAD &&
112116
PQconnectionNeedsPassword(conn) &&
113-
password == NULL &&
117+
!have_password &&
114118
param->pg_prompt != TRI_NO)
115119
{
116120
PQfinish(conn);
117-
password = simple_prompt("Password: ", 100, false);
121+
simple_prompt("Password: ", password, sizeof(password), false);
122+
have_password = true;
118123
new_pass = true;
119124
}
120125
} while (new_pass);

‎src/bin/initdb/initdb.c

+9-14
Original file line numberDiff line numberDiff line change
@@ -1557,8 +1557,8 @@ setup_auth(FILE *cmdfd)
15571557
static void
15581558
get_su_pwd(void)
15591559
{
1560-
char *pwd1,
1561-
*pwd2;
1560+
char pwd1[100];
1561+
char pwd2[100];
15621562

15631563
if (pwprompt)
15641564
{
@@ -1567,14 +1567,13 @@ get_su_pwd(void)
15671567
*/
15681568
printf("\n");
15691569
fflush(stdout);
1570-
pwd1 = simple_prompt("Enter new superuser password: ", 100, false);
1571-
pwd2 = simple_prompt("Enter it again: ", 100, false);
1570+
simple_prompt("Enter new superuser password: ", pwd1, sizeof(pwd1), false);
1571+
simple_prompt("Enter it again: ", pwd2, sizeof(pwd2), false);
15721572
if (strcmp(pwd1, pwd2) != 0)
15731573
{
15741574
fprintf(stderr, _("Passwords didn't match.\n"));
15751575
exit_nicely();
15761576
}
1577-
free(pwd2);
15781577
}
15791578
else
15801579
{
@@ -1587,7 +1586,6 @@ get_su_pwd(void)
15871586
* for now.
15881587
*/
15891588
FILE *pwf = fopen(pwfilename, "r");
1590-
char pwdbuf[MAXPGPATH];
15911589
int i;
15921590

15931591
if (!pwf)
@@ -1596,7 +1594,7 @@ get_su_pwd(void)
15961594
progname, pwfilename, strerror(errno));
15971595
exit_nicely();
15981596
}
1599-
if (!fgets(pwdbuf, sizeof(pwdbuf), pwf))
1597+
if (!fgets(pwd1, sizeof(pwd1), pwf))
16001598
{
16011599
if (ferror(pwf))
16021600
fprintf(stderr, _("%s: could not read password from file \"%s\": %s\n"),
@@ -1608,15 +1606,12 @@ get_su_pwd(void)
16081606
}
16091607
fclose(pwf);
16101608

1611-
i = strlen(pwdbuf);
1612-
while (i > 0 && (pwdbuf[i - 1] == '\r' || pwdbuf[i - 1] == '\n'))
1613-
pwdbuf[--i] = '\0';
1614-
1615-
pwd1 = pg_strdup(pwdbuf);
1616-
1609+
i = strlen(pwd1);
1610+
while (i > 0 && (pwd1[i - 1] == '\r' || pwd1[i - 1] == '\n'))
1611+
pwd1[--i] = '\0';
16171612
}
16181613

1619-
superuser_password = pwd1;
1614+
superuser_password = pg_strdup(pwd1);
16201615
}
16211616

16221617
/*

‎src/bin/pg_basebackup/nls.mk

+1
Original file line numberDiff line numberDiff line change
@@ -2,3 +2,4 @@
22
CATALOG_NAME = pg_basebackup
33
AVAIL_LANGUAGES = de es fr it ko pl pt_BR ru zh_CN
44
GETTEXT_FILES = pg_basebackup.c pg_receivexlog.c pg_recvlogical.c receivelog.c streamutil.c ../../common/fe_memutils.c
5+
GETTEXT_TRIGGERS = simple_prompt

‎src/bin/pg_basebackup/streamutil.c

+7-7
Original file line numberDiff line numberDiff line change
@@ -41,7 +41,8 @@ char *dbport = NULL;
4141
char *replication_slot = NULL;
4242
char *dbname = NULL;
4343
int dbgetpassword = 0; /* 0=auto, -1=never, 1=always */
44-
static char *dbpassword = NULL;
44+
static bool have_password = false;
45+
static char password[100];
4546
PGconn *conn = NULL;
4647

4748
/*
@@ -141,24 +142,23 @@ GetConnection(void)
141142
}
142143

143144
/* If -W was given, force prompt for password, but only the first time */
144-
need_password = (dbgetpassword == 1 && dbpassword == NULL);
145+
need_password = (dbgetpassword == 1 && !have_password);
145146

146147
do
147148
{
148149
/* Get a new password if appropriate */
149150
if (need_password)
150151
{
151-
if (dbpassword)
152-
free(dbpassword);
153-
dbpassword = simple_prompt(_("Password: "), 100, false);
152+
simple_prompt("Password: ", password, sizeof(password), false);
153+
have_password = true;
154154
need_password = false;
155155
}
156156

157157
/* Use (or reuse, on a subsequent connection) password if we have it */
158-
if (dbpassword)
158+
if (have_password)
159159
{
160160
keywords[i] = "password";
161-
values[i] = dbpassword;
161+
values[i] = password;
162162
}
163163
else
164164
{

‎src/bin/pg_dump/pg_backup_db.c

+14-21
Original file line numberDiff line numberDiff line change
@@ -134,6 +134,7 @@ _connectDB(ArchiveHandle *AH, const char *reqdb, const char *requser)
134134
const char *newdb;
135135
const char *newuser;
136136
char *password;
137+
char passbuf[100];
137138
bool new_pass;
138139

139140
if (!reqdb)
@@ -149,13 +150,12 @@ _connectDB(ArchiveHandle *AH, const char *reqdb, const char *requser)
149150
ahlog(AH, 1, "connecting to database \"%s\" as user \"%s\"\n",
150151
newdb, newuser);
151152

152-
password = AH->savedPassword ? pg_strdup(AH->savedPassword) : NULL;
153+
password = AH->savedPassword;
153154

154155
if (AH->promptPassword == TRI_YES && password == NULL)
155156
{
156-
password = simple_prompt("Password: ", 100, false);
157-
if (password == NULL)
158-
exit_horribly(modulename, "out of memory\n");
157+
simple_prompt("Password: ", passbuf, sizeof(passbuf), false);
158+
password = passbuf;
159159
}
160160

161161
initPQExpBuffer(&connstr);
@@ -201,16 +201,14 @@ _connectDB(ArchiveHandle *AH, const char *reqdb, const char *requser)
201201
fprintf(stderr, "Connecting to %s as %s\n",
202202
newdb, newuser);
203203

204-
if (password)
205-
free(password);
206-
207204
if (AH->promptPassword != TRI_NO)
208-
password = simple_prompt("Password: ", 100, false);
205+
{
206+
simple_prompt("Password: ", passbuf, sizeof(passbuf), false);
207+
password = passbuf;
208+
}
209209
else
210210
exit_horribly(modulename, "connection needs password\n");
211211

212-
if (password == NULL)
213-
exit_horribly(modulename, "out of memory\n");
214212
new_pass = true;
215213
}
216214
} while (new_pass);
@@ -225,8 +223,6 @@ _connectDB(ArchiveHandle *AH, const char *reqdb, const char *requser)
225223
free(AH->savedPassword);
226224
AH->savedPassword = pg_strdup(PQpass(newConn));
227225
}
228-
if (password)
229-
free(password);
230226

231227
termPQExpBuffer(&connstr);
232228

@@ -258,18 +254,18 @@ ConnectDatabase(Archive *AHX,
258254
{
259255
ArchiveHandle *AH = (ArchiveHandle *) AHX;
260256
char *password;
257+
char passbuf[100];
261258
bool new_pass;
262259

263260
if (AH->connection)
264261
exit_horribly(modulename, "already connected to a database\n");
265262

266-
password = AH->savedPassword ? pg_strdup(AH->savedPassword) : NULL;
263+
password = AH->savedPassword;
267264

268265
if (prompt_password == TRI_YES && password == NULL)
269266
{
270-
password = simple_prompt("Password: ", 100, false);
271-
if (password == NULL)
272-
exit_horribly(modulename, "out of memory\n");
267+
simple_prompt("Password: ", passbuf, sizeof(passbuf), false);
268+
password = passbuf;
273269
}
274270
AH->promptPassword = prompt_password;
275271

@@ -309,9 +305,8 @@ ConnectDatabase(Archive *AHX,
309305
prompt_password != TRI_NO)
310306
{
311307
PQfinish(AH->connection);
312-
password = simple_prompt("Password: ", 100, false);
313-
if (password == NULL)
314-
exit_horribly(modulename, "out of memory\n");
308+
simple_prompt("Password: ", passbuf, sizeof(passbuf), false);
309+
password = passbuf;
315310
new_pass = true;
316311
}
317312
} while (new_pass);
@@ -332,8 +327,6 @@ ConnectDatabase(Archive *AHX,
332327
free(AH->savedPassword);
333328
AH->savedPassword = pg_strdup(PQpass(AH->connection));
334329
}
335-
if (password)
336-
free(password);
337330

338331
/* check for version mismatch */
339332
_check_database_version(AH);

‎src/bin/pg_dump/pg_dumpall.c

+11-6
Original file line numberDiff line numberDiff line change
@@ -1884,13 +1884,17 @@ connectDatabase(const char *dbname, const char *connection_string,
18841884
bool new_pass;
18851885
const char *remoteversion_str;
18861886
int my_version;
1887-
static char *password = NULL;
18881887
const char **keywords = NULL;
18891888
const char **values = NULL;
18901889
PQconninfoOption *conn_opts = NULL;
1890+
static bool have_password = false;
1891+
static char password[100];
18911892

1892-
if (prompt_password == TRI_YES && !password)
1893-
password = simple_prompt("Password: ", 100, false);
1893+
if (prompt_password == TRI_YES && !have_password)
1894+
{
1895+
simple_prompt("Password: ", password, sizeof(password), false);
1896+
have_password = true;
1897+
}
18941898

18951899
/*
18961900
* Start the connection. Loop until we have a password if requested by
@@ -1970,7 +1974,7 @@ connectDatabase(const char *dbname, const char *connection_string,
19701974
values[i] = pguser;
19711975
i++;
19721976
}
1973-
if (password)
1977+
if (have_password)
19741978
{
19751979
keywords[i] = "password";
19761980
values[i] = password;
@@ -1998,11 +2002,12 @@ connectDatabase(const char *dbname, const char *connection_string,
19982002

19992003
if (PQstatus(conn) == CONNECTION_BAD &&
20002004
PQconnectionNeedsPassword(conn) &&
2001-
password == NULL &&
2005+
!have_password &&
20022006
prompt_password != TRI_NO)
20032007
{
20042008
PQfinish(conn);
2005-
password = simple_prompt("Password: ", 100, false);
2009+
simple_prompt("Password: ", password, sizeof(password), false);
2010+
have_password = true;
20062011
new_pass = true;
20072012
}
20082013
} while (new_pass);

‎src/bin/pgbench/pgbench.c

+6-4
Original file line numberDiff line numberDiff line change
@@ -773,8 +773,9 @@ static PGconn *
773773
doConnect(void)
774774
{
775775
PGconn *conn;
776-
static char *password = NULL;
777776
bool new_pass;
777+
static bool have_password = false;
778+
static char password[100];
778779

779780
/*
780781
* Start the connection. Loop until we have a password if requested by
@@ -794,7 +795,7 @@ doConnect(void)
794795
keywords[2] = "user";
795796
values[2] = login;
796797
keywords[3] = "password";
797-
values[3] = password;
798+
values[3] = have_password ? password : NULL;
798799
keywords[4] = "dbname";
799800
values[4] = dbName;
800801
keywords[5] = "fallback_application_name";
@@ -815,10 +816,11 @@ doConnect(void)
815816

816817
if (PQstatus(conn) == CONNECTION_BAD &&
817818
PQconnectionNeedsPassword(conn) &&
818-
password == NULL)
819+
!have_password)
819820
{
820821
PQfinish(conn);
821-
password = simple_prompt("Password: ", 100, false);
822+
simple_prompt("Password: ", password, sizeof(password), false);
823+
have_password = true;
822824
new_pass = true;
823825
}
824826
} while (new_pass);
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