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add some hardering

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This commit is contained in:
vms 2019-08-21 14:28:50 +02:00
parent f5ddb09b8b
commit 8423d24072
2 changed files with 27 additions and 4 deletions
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22
backend-c/src/main.c
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@ -12,7 +12,15 @@ const char *fetch_posts_request(const json_t *json);
bool isInited = 0;
const char *invoke(char *str, int length) {
/**
* Executes given request and returns result in as a pointer to the following structure:
* | result size (4 bytes, le)| result (size bytes) |.
*
* @param request a pointer to the supplied request in JSON format
* @param request_size a size of the supplied sql request
* @return a pointer to the struct contains result_size and result
*/
const char *invoke(char *request, int request_size) {
// initialize SQLite by creating schema
if(0 == isInited) {
create_scheme();
@ -23,7 +31,7 @@ const char *invoke(char *str, int length) {
const unsigned int pool_size = sizeof pool / sizeof *pool;
// try to parse json and extract action field
const json_t *json = json_create(str, pool, pool_size);
const json_t *json = json_create(request, pool, pool_size);
if(!json) {
const char error[] = "Mailformed json given";
return prepare_response(error, sizeof error);
@ -49,8 +57,11 @@ const char *invoke(char *str, int length) {
} else if(0 == strcmp(action, "Fetch")) {
result = fetch_posts_request(json);
} else {
// no suitable action given
char *error = (char *)malloc(1024);
// no suitable action is given
char *error = malloc(1024);
if(0 == error) {
return 0;
}
const int error_size = snprintf(error, 1024, "%s given as the action field, but only `Post` and `Fetch` are supported", action);
result = prepare_response(error, error_size);
free(error);
@ -139,6 +150,9 @@ const char *fetch_posts_request(const json_t *json) {
const int result_len = strlen(result) + 100;
char *result_out = malloc(result_len);
if(0 == result_out) {
return 0;
}
const int result_out_len = snprintf(result_out, result_len, "{ posts: \"%s\" }", result);

9
backend-c/src/model.c
View File

@ -17,6 +17,9 @@ char *add_post(const char *username, int username_length, const char *message, i
// at now wasm-ld has 1024 bytes for stack permission by default - that why dynamic allocation here
const int request_size = username_length + message_length + 50;
char *add_sql = (char *)malloc(request_size);
if(0 == add_sql) {
return 0;
}
const int add_sql_length = snprintf(add_sql, request_size, "INSERT INTO messages VALUES(\"%s\", \"%s\")", message, username);
if(add_sql_length < 0) {
@ -29,6 +32,9 @@ char *add_post(const char *username, int username_length, const char *message, i
char *get_all_posts(int offset, int count) {
// at now wasm-ld has 1024 bytes for stack permission by default - that why dynamic allocation here
char *get_sql = (char *)malloc(256);
if(0 == get_sql) {
return 0;
}
const int get_sql_length = snprintf(get_sql, 256,
"SELECT json_group_array("
@ -47,6 +53,9 @@ char *get_posts_by_username(const char *username, int username_length, int offse
// at now wasm-ld has 1024 bytes for stack permission by default - that why dynamic allocation here
const int request_size = username_length + 300;
char *get_sql = (char *)malloc(request_size);
if(0 == get_sql) {
return 0;
}
const int add_sql_length = snprintf(get_sql, request_size,
"SELECT json_group_array("