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-rw-r--r--crypto/engine/eng_ctrl.c620
1 files changed, 308 insertions, 312 deletions
diff --git a/crypto/engine/eng_ctrl.c b/crypto/engine/eng_ctrl.c
index 5ce25d92ec95..e6c0dfb01161 100644
--- a/crypto/engine/eng_ctrl.c
+++ b/crypto/engine/eng_ctrl.c
@@ -7,7 +7,7 @@
* are met:
*
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
@@ -55,335 +55,331 @@
#include "eng_int.h"
-/* When querying a ENGINE-specific control command's 'description', this string
- * is used if the ENGINE_CMD_DEFN has cmd_desc set to NULL. */
+/*
+ * When querying a ENGINE-specific control command's 'description', this
+ * string is used if the ENGINE_CMD_DEFN has cmd_desc set to NULL.
+ */
static const char *int_no_description = "";
-/* These internal functions handle 'CMD'-related control commands when the
+/*
+ * These internal functions handle 'CMD'-related control commands when the
* ENGINE in question has asked us to take care of it (ie. the ENGINE did not
- * set the ENGINE_FLAGS_MANUAL_CMD_CTRL flag. */
+ * set the ENGINE_FLAGS_MANUAL_CMD_CTRL flag.
+ */
static int int_ctrl_cmd_is_null(const ENGINE_CMD_DEFN *defn)
- {
- if((defn->cmd_num == 0) || (defn->cmd_name == NULL))
- return 1;
- return 0;
- }
+{
+ if ((defn->cmd_num == 0) || (defn->cmd_name == NULL))
+ return 1;
+ return 0;
+}
static int int_ctrl_cmd_by_name(const ENGINE_CMD_DEFN *defn, const char *s)
- {
- int idx = 0;
- while(!int_ctrl_cmd_is_null(defn) && (strcmp(defn->cmd_name, s) != 0))
- {
- idx++;
- defn++;
- }
- if(int_ctrl_cmd_is_null(defn))
- /* The given name wasn't found */
- return -1;
- return idx;
- }
+{
+ int idx = 0;
+ while (!int_ctrl_cmd_is_null(defn) && (strcmp(defn->cmd_name, s) != 0)) {
+ idx++;
+ defn++;
+ }
+ if (int_ctrl_cmd_is_null(defn))
+ /* The given name wasn't found */
+ return -1;
+ return idx;
+}
static int int_ctrl_cmd_by_num(const ENGINE_CMD_DEFN *defn, unsigned int num)
- {
- int idx = 0;
- /* NB: It is stipulated that 'cmd_defn' lists are ordered by cmd_num. So
- * our searches don't need to take any longer than necessary. */
- while(!int_ctrl_cmd_is_null(defn) && (defn->cmd_num < num))
- {
- idx++;
- defn++;
- }
- if(defn->cmd_num == num)
- return idx;
- /* The given cmd_num wasn't found */
- return -1;
- }
+{
+ int idx = 0;
+ /*
+ * NB: It is stipulated that 'cmd_defn' lists are ordered by cmd_num. So
+ * our searches don't need to take any longer than necessary.
+ */
+ while (!int_ctrl_cmd_is_null(defn) && (defn->cmd_num < num)) {
+ idx++;
+ defn++;
+ }
+ if (defn->cmd_num == num)
+ return idx;
+ /* The given cmd_num wasn't found */
+ return -1;
+}
static int int_ctrl_helper(ENGINE *e, int cmd, long i, void *p,
- void (*f)(void))
- {
- int idx;
- char *s = (char *)p;
- /* Take care of the easy one first (eg. it requires no searches) */
- if(cmd == ENGINE_CTRL_GET_FIRST_CMD_TYPE)
- {
- if((e->cmd_defns == NULL) || int_ctrl_cmd_is_null(e->cmd_defns))
- return 0;
- return e->cmd_defns->cmd_num;
- }
- /* One or two commands require that "p" be a valid string buffer */
- if((cmd == ENGINE_CTRL_GET_CMD_FROM_NAME) ||
- (cmd == ENGINE_CTRL_GET_NAME_FROM_CMD) ||
- (cmd == ENGINE_CTRL_GET_DESC_FROM_CMD))
- {
- if(s == NULL)
- {
- ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
- ERR_R_PASSED_NULL_PARAMETER);
- return -1;
- }
- }
- /* Now handle cmd_name -> cmd_num conversion */
- if(cmd == ENGINE_CTRL_GET_CMD_FROM_NAME)
- {
- if((e->cmd_defns == NULL) || ((idx = int_ctrl_cmd_by_name(
- e->cmd_defns, s)) < 0))
- {
- ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
- ENGINE_R_INVALID_CMD_NAME);
- return -1;
- }
- return e->cmd_defns[idx].cmd_num;
- }
- /* For the rest of the commands, the 'long' argument must specify a
- * valie command number - so we need to conduct a search. */
- if((e->cmd_defns == NULL) || ((idx = int_ctrl_cmd_by_num(e->cmd_defns,
- (unsigned int)i)) < 0))
- {
- ENGINEerr(ENGINE_F_INT_CTRL_HELPER,
- ENGINE_R_INVALID_CMD_NUMBER);
- return -1;
- }
- /* Now the logic splits depending on command type */
- switch(cmd)
- {
- case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
- idx++;
- if(int_ctrl_cmd_is_null(e->cmd_defns + idx))
- /* end-of-list */
- return 0;
- else
- return e->cmd_defns[idx].cmd_num;
- case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
- return strlen(e->cmd_defns[idx].cmd_name);
- case ENGINE_CTRL_GET_NAME_FROM_CMD:
- return BIO_snprintf(s,strlen(e->cmd_defns[idx].cmd_name) + 1,
- "%s", e->cmd_defns[idx].cmd_name);
- case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
- if(e->cmd_defns[idx].cmd_desc)
- return strlen(e->cmd_defns[idx].cmd_desc);
- return strlen(int_no_description);
- case ENGINE_CTRL_GET_DESC_FROM_CMD:
- if(e->cmd_defns[idx].cmd_desc)
- return BIO_snprintf(s,
- strlen(e->cmd_defns[idx].cmd_desc) + 1,
- "%s", e->cmd_defns[idx].cmd_desc);
- return BIO_snprintf(s, strlen(int_no_description) + 1,"%s",
- int_no_description);
- case ENGINE_CTRL_GET_CMD_FLAGS:
- return e->cmd_defns[idx].cmd_flags;
- }
- /* Shouldn't really be here ... */
- ENGINEerr(ENGINE_F_INT_CTRL_HELPER,ENGINE_R_INTERNAL_LIST_ERROR);
- return -1;
- }
+ void (*f) (void))
+{
+ int idx;
+ char *s = (char *)p;
+ /* Take care of the easy one first (eg. it requires no searches) */
+ if (cmd == ENGINE_CTRL_GET_FIRST_CMD_TYPE) {
+ if ((e->cmd_defns == NULL) || int_ctrl_cmd_is_null(e->cmd_defns))
+ return 0;
+ return e->cmd_defns->cmd_num;
+ }
+ /* One or two commands require that "p" be a valid string buffer */
+ if ((cmd == ENGINE_CTRL_GET_CMD_FROM_NAME) ||
+ (cmd == ENGINE_CTRL_GET_NAME_FROM_CMD) ||
+ (cmd == ENGINE_CTRL_GET_DESC_FROM_CMD)) {
+ if (s == NULL) {
+ ENGINEerr(ENGINE_F_INT_CTRL_HELPER, ERR_R_PASSED_NULL_PARAMETER);
+ return -1;
+ }
+ }
+ /* Now handle cmd_name -> cmd_num conversion */
+ if (cmd == ENGINE_CTRL_GET_CMD_FROM_NAME) {
+ if ((e->cmd_defns == NULL)
+ || ((idx = int_ctrl_cmd_by_name(e->cmd_defns, s)) < 0)) {
+ ENGINEerr(ENGINE_F_INT_CTRL_HELPER, ENGINE_R_INVALID_CMD_NAME);
+ return -1;
+ }
+ return e->cmd_defns[idx].cmd_num;
+ }
+ /*
+ * For the rest of the commands, the 'long' argument must specify a valie
+ * command number - so we need to conduct a search.
+ */
+ if ((e->cmd_defns == NULL) || ((idx = int_ctrl_cmd_by_num(e->cmd_defns,
+ (unsigned int)
+ i)) < 0)) {
+ ENGINEerr(ENGINE_F_INT_CTRL_HELPER, ENGINE_R_INVALID_CMD_NUMBER);
+ return -1;
+ }
+ /* Now the logic splits depending on command type */
+ switch (cmd) {
+ case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
+ idx++;
+ if (int_ctrl_cmd_is_null(e->cmd_defns + idx))
+ /* end-of-list */
+ return 0;
+ else
+ return e->cmd_defns[idx].cmd_num;
+ case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
+ return strlen(e->cmd_defns[idx].cmd_name);
+ case ENGINE_CTRL_GET_NAME_FROM_CMD:
+ return BIO_snprintf(s, strlen(e->cmd_defns[idx].cmd_name) + 1,
+ "%s", e->cmd_defns[idx].cmd_name);
+ case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
+ if (e->cmd_defns[idx].cmd_desc)
+ return strlen(e->cmd_defns[idx].cmd_desc);
+ return strlen(int_no_description);
+ case ENGINE_CTRL_GET_DESC_FROM_CMD:
+ if (e->cmd_defns[idx].cmd_desc)
+ return BIO_snprintf(s,
+ strlen(e->cmd_defns[idx].cmd_desc) + 1,
+ "%s", e->cmd_defns[idx].cmd_desc);
+ return BIO_snprintf(s, strlen(int_no_description) + 1, "%s",
+ int_no_description);
+ case ENGINE_CTRL_GET_CMD_FLAGS:
+ return e->cmd_defns[idx].cmd_flags;
+ }
+ /* Shouldn't really be here ... */
+ ENGINEerr(ENGINE_F_INT_CTRL_HELPER, ENGINE_R_INTERNAL_LIST_ERROR);
+ return -1;
+}
-int ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f)(void))
- {
- int ctrl_exists, ref_exists;
- if(e == NULL)
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL,ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
- ref_exists = ((e->struct_ref > 0) ? 1 : 0);
- CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
- ctrl_exists = ((e->ctrl == NULL) ? 0 : 1);
- if(!ref_exists)
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_REFERENCE);
- return 0;
- }
- /* Intercept any "root-level" commands before trying to hand them on to
- * ctrl() handlers. */
- switch(cmd)
- {
- case ENGINE_CTRL_HAS_CTRL_FUNCTION:
- return ctrl_exists;
- case ENGINE_CTRL_GET_FIRST_CMD_TYPE:
- case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
- case ENGINE_CTRL_GET_CMD_FROM_NAME:
- case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
- case ENGINE_CTRL_GET_NAME_FROM_CMD:
- case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
- case ENGINE_CTRL_GET_DESC_FROM_CMD:
- case ENGINE_CTRL_GET_CMD_FLAGS:
- if(ctrl_exists && !(e->flags & ENGINE_FLAGS_MANUAL_CMD_CTRL))
- return int_ctrl_helper(e,cmd,i,p,f);
- if(!ctrl_exists)
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_CONTROL_FUNCTION);
- /* For these cmd-related functions, failure is indicated
- * by a -1 return value (because 0 is used as a valid
- * return in some places). */
- return -1;
- }
- default:
- break;
- }
- /* Anything else requires a ctrl() handler to exist. */
- if(!ctrl_exists)
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL,ENGINE_R_NO_CONTROL_FUNCTION);
- return 0;
- }
- return e->ctrl(e, cmd, i, p, f);
- }
+int ENGINE_ctrl(ENGINE *e, int cmd, long i, void *p, void (*f) (void))
+{
+ int ctrl_exists, ref_exists;
+ if (e == NULL) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL, ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+ CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
+ ref_exists = ((e->struct_ref > 0) ? 1 : 0);
+ CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
+ ctrl_exists = ((e->ctrl == NULL) ? 0 : 1);
+ if (!ref_exists) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL, ENGINE_R_NO_REFERENCE);
+ return 0;
+ }
+ /*
+ * Intercept any "root-level" commands before trying to hand them on to
+ * ctrl() handlers.
+ */
+ switch (cmd) {
+ case ENGINE_CTRL_HAS_CTRL_FUNCTION:
+ return ctrl_exists;
+ case ENGINE_CTRL_GET_FIRST_CMD_TYPE:
+ case ENGINE_CTRL_GET_NEXT_CMD_TYPE:
+ case ENGINE_CTRL_GET_CMD_FROM_NAME:
+ case ENGINE_CTRL_GET_NAME_LEN_FROM_CMD:
+ case ENGINE_CTRL_GET_NAME_FROM_CMD:
+ case ENGINE_CTRL_GET_DESC_LEN_FROM_CMD:
+ case ENGINE_CTRL_GET_DESC_FROM_CMD:
+ case ENGINE_CTRL_GET_CMD_FLAGS:
+ if (ctrl_exists && !(e->flags & ENGINE_FLAGS_MANUAL_CMD_CTRL))
+ return int_ctrl_helper(e, cmd, i, p, f);
+ if (!ctrl_exists) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL, ENGINE_R_NO_CONTROL_FUNCTION);
+ /*
+ * For these cmd-related functions, failure is indicated by a -1
+ * return value (because 0 is used as a valid return in some
+ * places).
+ */
+ return -1;
+ }
+ default:
+ break;
+ }
+ /* Anything else requires a ctrl() handler to exist. */
+ if (!ctrl_exists) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL, ENGINE_R_NO_CONTROL_FUNCTION);
+ return 0;
+ }
+ return e->ctrl(e, cmd, i, p, f);
+}
int ENGINE_cmd_is_executable(ENGINE *e, int cmd)
- {
- int flags;
- if((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, cmd, NULL, NULL)) < 0)
- {
- ENGINEerr(ENGINE_F_ENGINE_CMD_IS_EXECUTABLE,
- ENGINE_R_INVALID_CMD_NUMBER);
- return 0;
- }
- if(!(flags & ENGINE_CMD_FLAG_NO_INPUT) &&
- !(flags & ENGINE_CMD_FLAG_NUMERIC) &&
- !(flags & ENGINE_CMD_FLAG_STRING))
- return 0;
- return 1;
- }
+{
+ int flags;
+ if ((flags =
+ ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, cmd, NULL, NULL)) < 0) {
+ ENGINEerr(ENGINE_F_ENGINE_CMD_IS_EXECUTABLE,
+ ENGINE_R_INVALID_CMD_NUMBER);
+ return 0;
+ }
+ if (!(flags & ENGINE_CMD_FLAG_NO_INPUT) &&
+ !(flags & ENGINE_CMD_FLAG_NUMERIC) &&
+ !(flags & ENGINE_CMD_FLAG_STRING))
+ return 0;
+ return 1;
+}
int ENGINE_ctrl_cmd(ENGINE *e, const char *cmd_name,
- long i, void *p, void (*f)(void), int cmd_optional)
- {
- int num;
+ long i, void *p, void (*f) (void), int cmd_optional)
+{
+ int num;
- if((e == NULL) || (cmd_name == NULL))
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD,
- ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- if((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
- ENGINE_CTRL_GET_CMD_FROM_NAME,
- 0, (void *)cmd_name, NULL)) <= 0))
- {
- /* If the command didn't *have* to be supported, we fake
- * success. This allows certain settings to be specified for
- * multiple ENGINEs and only require a change of ENGINE id
- * (without having to selectively apply settings). Eg. changing
- * from a hardware device back to the regular software ENGINE
- * without editing the config file, etc. */
- if(cmd_optional)
- {
- ERR_clear_error();
- return 1;
- }
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD,
- ENGINE_R_INVALID_CMD_NAME);
- return 0;
- }
- /* Force the result of the control command to 0 or 1, for the reasons
- * mentioned before. */
- if (ENGINE_ctrl(e, num, i, p, f) > 0)
- return 1;
+ if ((e == NULL) || (cmd_name == NULL)) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD, ERR_R_PASSED_NULL_PARAMETER);
return 0;
+ }
+ if ((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
+ ENGINE_CTRL_GET_CMD_FROM_NAME,
+ 0, (void *)cmd_name,
+ NULL)) <= 0)) {
+ /*
+ * If the command didn't *have* to be supported, we fake success.
+ * This allows certain settings to be specified for multiple ENGINEs
+ * and only require a change of ENGINE id (without having to
+ * selectively apply settings). Eg. changing from a hardware device
+ * back to the regular software ENGINE without editing the config
+ * file, etc.
+ */
+ if (cmd_optional) {
+ ERR_clear_error();
+ return 1;
}
+ ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD, ENGINE_R_INVALID_CMD_NAME);
+ return 0;
+ }
+ /*
+ * Force the result of the control command to 0 or 1, for the reasons
+ * mentioned before.
+ */
+ if (ENGINE_ctrl(e, num, i, p, f) > 0)
+ return 1;
+ return 0;
+}
int ENGINE_ctrl_cmd_string(ENGINE *e, const char *cmd_name, const char *arg,
- int cmd_optional)
- {
- int num, flags;
- long l;
- char *ptr;
- if((e == NULL) || (cmd_name == NULL))
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
- if((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
- ENGINE_CTRL_GET_CMD_FROM_NAME,
- 0, (void *)cmd_name, NULL)) <= 0))
- {
- /* If the command didn't *have* to be supported, we fake
- * success. This allows certain settings to be specified for
- * multiple ENGINEs and only require a change of ENGINE id
- * (without having to selectively apply settings). Eg. changing
- * from a hardware device back to the regular software ENGINE
- * without editing the config file, etc. */
- if(cmd_optional)
- {
- ERR_clear_error();
- return 1;
- }
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_INVALID_CMD_NAME);
- return 0;
- }
- if(!ENGINE_cmd_is_executable(e, num))
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_CMD_NOT_EXECUTABLE);
- return 0;
- }
- if((flags = ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num, NULL, NULL)) < 0)
- {
- /* Shouldn't happen, given that ENGINE_cmd_is_executable()
- * returned success. */
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_INTERNAL_LIST_ERROR);
- return 0;
- }
- /* If the command takes no input, there must be no input. And vice
- * versa. */
- if(flags & ENGINE_CMD_FLAG_NO_INPUT)
- {
- if(arg != NULL)
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_COMMAND_TAKES_NO_INPUT);
- return 0;
- }
- /* We deliberately force the result of ENGINE_ctrl() to 0 or 1
- * rather than returning it as "return data". This is to ensure
- * usage of these commands is consistent across applications and
- * that certain applications don't understand it one way, and
- * others another. */
- if(ENGINE_ctrl(e, num, 0, (void *)arg, NULL) > 0)
- return 1;
- return 0;
- }
- /* So, we require input */
- if(arg == NULL)
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_COMMAND_TAKES_INPUT);
- return 0;
- }
- /* If it takes string input, that's easy */
- if(flags & ENGINE_CMD_FLAG_STRING)
- {
- /* Same explanation as above */
- if(ENGINE_ctrl(e, num, 0, (void *)arg, NULL) > 0)
- return 1;
- return 0;
- }
- /* If it doesn't take numeric either, then it is unsupported for use in
- * a config-setting situation, which is what this function is for. This
- * should never happen though, because ENGINE_cmd_is_executable() was
- * used. */
- if(!(flags & ENGINE_CMD_FLAG_NUMERIC))
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_INTERNAL_LIST_ERROR);
- return 0;
- }
- l = strtol(arg, &ptr, 10);
- if((arg == ptr) || (*ptr != '\0'))
- {
- ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
- ENGINE_R_ARGUMENT_IS_NOT_A_NUMBER);
- return 0;
- }
- /* Force the result of the control command to 0 or 1, for the reasons
- * mentioned before. */
- if(ENGINE_ctrl(e, num, l, NULL, NULL) > 0)
- return 1;
- return 0;
- }
+ int cmd_optional)
+{
+ int num, flags;
+ long l;
+ char *ptr;
+ if ((e == NULL) || (cmd_name == NULL)) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+ ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+ if ((e->ctrl == NULL) || ((num = ENGINE_ctrl(e,
+ ENGINE_CTRL_GET_CMD_FROM_NAME,
+ 0, (void *)cmd_name,
+ NULL)) <= 0)) {
+ /*
+ * If the command didn't *have* to be supported, we fake success.
+ * This allows certain settings to be specified for multiple ENGINEs
+ * and only require a change of ENGINE id (without having to
+ * selectively apply settings). Eg. changing from a hardware device
+ * back to the regular software ENGINE without editing the config
+ * file, etc.
+ */
+ if (cmd_optional) {
+ ERR_clear_error();
+ return 1;
+ }
+ ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING, ENGINE_R_INVALID_CMD_NAME);
+ return 0;
+ }
+ if (!ENGINE_cmd_is_executable(e, num)) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+ ENGINE_R_CMD_NOT_EXECUTABLE);
+ return 0;
+ }
+ if ((flags =
+ ENGINE_ctrl(e, ENGINE_CTRL_GET_CMD_FLAGS, num, NULL, NULL)) < 0) {
+ /*
+ * Shouldn't happen, given that ENGINE_cmd_is_executable() returned
+ * success.
+ */
+ ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+ ENGINE_R_INTERNAL_LIST_ERROR);
+ return 0;
+ }
+ /*
+ * If the command takes no input, there must be no input. And vice versa.
+ */
+ if (flags & ENGINE_CMD_FLAG_NO_INPUT) {
+ if (arg != NULL) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+ ENGINE_R_COMMAND_TAKES_NO_INPUT);
+ return 0;
+ }
+ /*
+ * We deliberately force the result of ENGINE_ctrl() to 0 or 1 rather
+ * than returning it as "return data". This is to ensure usage of
+ * these commands is consistent across applications and that certain
+ * applications don't understand it one way, and others another.
+ */
+ if (ENGINE_ctrl(e, num, 0, (void *)arg, NULL) > 0)
+ return 1;
+ return 0;
+ }
+ /* So, we require input */
+ if (arg == NULL) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+ ENGINE_R_COMMAND_TAKES_INPUT);
+ return 0;
+ }
+ /* If it takes string input, that's easy */
+ if (flags & ENGINE_CMD_FLAG_STRING) {
+ /* Same explanation as above */
+ if (ENGINE_ctrl(e, num, 0, (void *)arg, NULL) > 0)
+ return 1;
+ return 0;
+ }
+ /*
+ * If it doesn't take numeric either, then it is unsupported for use in a
+ * config-setting situation, which is what this function is for. This
+ * should never happen though, because ENGINE_cmd_is_executable() was
+ * used.
+ */
+ if (!(flags & ENGINE_CMD_FLAG_NUMERIC)) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+ ENGINE_R_INTERNAL_LIST_ERROR);
+ return 0;
+ }
+ l = strtol(arg, &ptr, 10);
+ if ((arg == ptr) || (*ptr != '\0')) {
+ ENGINEerr(ENGINE_F_ENGINE_CTRL_CMD_STRING,
+ ENGINE_R_ARGUMENT_IS_NOT_A_NUMBER);
+ return 0;
+ }
+ /*
+ * Force the result of the control command to 0 or 1, for the reasons
+ * mentioned before.
+ */
+ if (ENGINE_ctrl(e, num, l, NULL, NULL) > 0)
+ return 1;
+ return 0;
+}