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|
#include "web.h"
#include "mytime.h"
#include <assert.h>
#include <sys/socket.h>
#include <string.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <microhttpd.h>
#include <sqlite3.h>
#include <cjson/cJSON.h>
#define PAGE "<html><head><title>libmicrohttpd demo</title>"\
"</head><body>libmicrohttpd demo</body></html>"
static void sqliteError(void *pArg, int iErrCode, const char *zMsg) {
// @CLEANUP: We should stuff these somewhere, but for now just print it
fprintf(stderr, "(%d) %s\n", iErrCode, zMsg);
}
struct PostCollector {
char *data;
size_t size;
size_t capacity;
};
struct Request {
struct Server *server;
struct PostCollector pp;
};
void prepare_database(struct App *app) {
// @CLEANUP: Move this to main? doesn't belong here at least
sqlite3_config(SQLITE_CONFIG_LOG, sqliteError, NULL);
sqlite3_config(SQLITE_CONFIG_URI, 1);
int err;
printf("Running migrations against %s\n", app->dbname);
sqlite3 *conn;
if((err = sqlite3_open(app->dbname, &conn)) != SQLITE_OK) {
fprintf(stderr, "(%d) %s\n", err, sqlite3_errmsg(conn));
abort();
}
sqlite3_db_config(conn, SQLITE_DBCONFIG_ENABLE_FKEY, 1, NULL);
if(sqlite3_exec(conn, "CREATE TABLE IF NOT EXISTS migration (id INTEGER PRIMARY KEY NOT NULL)", NULL, NULL, NULL) != SQLITE_OK) {
abort();
}
sqlite3_stmt *stmt;
if(sqlite3_prepare_v2(conn, "SELECT MAX(id) FROM migration", -1, &stmt, NULL) != SQLITE_OK) {
abort();
}
uint64_t maxVersion = 0;
while((err = sqlite3_step(stmt)) == SQLITE_ROW) {
maxVersion = sqlite3_column_int64(stmt, 0);
}
if(err != SQLITE_DONE) {
abort();
}
if(sqlite3_finalize(stmt) != SQLITE_OK) {
abort();
}
if(maxVersion < 1) {
char *prog =
"BEGIN TRANSACTION;"
"CREATE TABLE backups ("
"id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "
"client TEXT NOT NULL, "
"status TEXT NOT NULL, "
"started TEXT NOT NULL, "
"completed TEXT "
") STRICT";
if(sqlite3_exec(conn, prog, NULL, NULL, NULL) != SQLITE_OK) {
abort();
}
sqlite3_stmt *stmt;
if(sqlite3_prepare_v2(conn, "INSERT INTO migration (id) VALUES (?1)", -1, &stmt, NULL) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_int64(stmt, 1, 1) != SQLITE_OK) {
abort();
}
if(sqlite3_step(stmt) != SQLITE_DONE) {
abort();
}
if(sqlite3_finalize(stmt) != SQLITE_OK) {
abort();
}
if(sqlite3_exec(conn, "COMMIT TRANSACTION", NULL, NULL, NULL) != SQLITE_OK) {
abort();
}
}
if(maxVersion < 2) {
char *prog =
"BEGIN TRANSACTION;"
"CREATE TABLE clients ("
"id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "
"name TEXT NOT NULL "
") STRICT;"
"INSERT INTO clients(name) "
"SELECT b.client "
"FROM backups b "
"GROUP BY b.client;"
"CREATE TABLE backups_next ("
"id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, "
"client INTEGER NOT NULL, "
"status TEXT NOT NULL, "
"started TEXT NOT NULL, "
"completed TEXT ,"
"FOREIGN KEY(client) REFERENCES clients(id)"
") STRICT;"
"INSERT INTO backups_next(id, client, status, started, completed) "
"SELECT b.id, c.id, b.status, b.started, b.completed "
"FROM backups b "
"JOIN clients c ON b.client = c.name;"
"DROP TABLE backups;"
"ALTER TABLE backups_next RENAME TO backups;";
if(sqlite3_exec(conn, prog, NULL, NULL, NULL) != SQLITE_OK) {
abort();
}
sqlite3_stmt *stmt;
if(sqlite3_prepare_v2(conn, "INSERT INTO migration (id) VALUES (?1)", -1, &stmt, NULL) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_int64(stmt, 1, 2) != SQLITE_OK) {
abort();
}
if(sqlite3_step(stmt) != SQLITE_DONE) {
abort();
}
if(sqlite3_finalize(stmt) != SQLITE_OK) {
abort();
}
if(sqlite3_exec(conn, "COMMIT TRANSACTION", NULL, NULL, NULL) != SQLITE_OK) {
abort();
}
}
if(maxVersion < 3) {
char *prog =
"BEGIN TRANSACTION;"
"CREATE UNIQUE INDEX clients_name ON clients(name)";
if(sqlite3_exec(conn, prog, NULL, NULL, NULL) != SQLITE_OK) {
abort();
}
sqlite3_stmt *stmt;
if(sqlite3_prepare_v2(conn, "INSERT INTO migration (id) VALUES (?1)", -1, &stmt, NULL) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_int64(stmt, 1, 3) != SQLITE_OK) {
abort();
}
if(sqlite3_step(stmt) != SQLITE_DONE) {
abort();
}
if(sqlite3_finalize(stmt) != SQLITE_OK) {
abort();
}
if(sqlite3_exec(conn, "COMMIT TRANSACTION", NULL, NULL, NULL) != SQLITE_OK) {
abort();
}
}
}
enum ReportEvent {
REV_BEGIN,
REV_FINISH,
};
// @CLEANUP: This should live somewhere else, but I don't have a spot for it yet.
int submit_report(struct App *app, char *client, enum ReportEvent event) {
sqlite3 *conn;
int err;
if((err = sqlite3_open(app->dbname, &conn)) != SQLITE_OK) {
abort();
}
struct timespec now = get_current_time();
int64_t clientId;
{
sqlite3_stmt *stmt;
if(sqlite3_prepare_v2(conn, "SELECT id FROM clients WHERE name = ?1", -1, &stmt, NULL) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_text(stmt, 1, client, -1, SQLITE_STATIC) != SQLITE_OK) {
abort();
}
if(sqlite3_step(stmt) != SQLITE_ROW) {
abort();
}
if(sqlite3_column_type(stmt, 0) == SQLITE_NULL) {
abort();
}
clientId = sqlite3_column_int64(stmt, 0);
if(sqlite3_step(stmt) != SQLITE_DONE) {
abort();
}
if(sqlite3_finalize(stmt) != SQLITE_OK) {
abort();
}
}
switch(event) {
case REV_BEGIN: {
sqlite3_stmt *stmt;
if(sqlite3_prepare_v2(conn, "INSERT INTO backups (client, status, started) VALUES (?1, ?2, datetime(?3, 'unixepoch', 'subsec'))", -1, &stmt, NULL) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_int64(stmt, 1, clientId) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_text(stmt, 2, "RUNNING", -1, SQLITE_STATIC) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_double(stmt, 3, TIME_AS_FLOAT(now)) != SQLITE_OK) {
abort();
}
if(sqlite3_step(stmt) != SQLITE_DONE) {
abort();
}
if(sqlite3_finalize(stmt) != SQLITE_OK) {
abort();
}
break;
}
case REV_FINISH: {
uint64_t backupId;
sqlite3_stmt *stmt;
if(sqlite3_prepare_v2(conn, "SELECT id FROM backups WHERE client = ?1 AND status = 'RUNNING'", -1, &stmt, NULL) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_int64(stmt, 1, clientId) != SQLITE_OK) {
abort();
}
if(sqlite3_step(stmt) != SQLITE_ROW) {
abort();
}
if(sqlite3_column_type(stmt, 0) == SQLITE_NULL) {
abort();
}
backupId = sqlite3_column_int64(stmt, 0);
if(sqlite3_step(stmt) != SQLITE_DONE) {
abort();
}
if(sqlite3_finalize(stmt) != SQLITE_OK) {
abort();
}
stmt = NULL;
if(sqlite3_prepare_v2(conn, "UPDATE backups SET status = ?1, completed = datetime(?2, 'unixepoch', 'subsec') WHERE id = ?3", -1, &stmt, NULL) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_text(stmt, 1, "FINISHED", -1, SQLITE_STATIC) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_double(stmt, 2, TIME_AS_FLOAT(now)) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_int64(stmt, 3, backupId) != SQLITE_OK) {
abort();
}
if(sqlite3_step(stmt) != SQLITE_DONE) {
abort();
}
if(sqlite3_finalize(stmt) != SQLITE_OK) {
abort();
}
break;
}
}
return 0;
}
struct CreateClientResult {
int64_t id;
char* name;
};
int create_client(struct Request *req, char *name, struct CreateClientResult *result) {
sqlite3 *conn;
int err;
if((err = sqlite3_open(req->server->app->dbname, &conn)) != SQLITE_OK) {
abort();
}
{
sqlite3_stmt *stmt;
if(sqlite3_prepare_v2(conn, "INSERT INTO clients (name) VALUES (?1)", -1, &stmt, NULL) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_text(stmt, 1, name, -1, SQLITE_STATIC) != SQLITE_OK) {
abort();
}
if(sqlite3_step(stmt) != SQLITE_DONE) {
abort();
}
result->id = sqlite3_last_insert_rowid(conn);
if(sqlite3_finalize(stmt) != SQLITE_OK) {
abort();
}
}
return 0;
}
int list_clients(struct Request *req, char **response, size_t *response_len) {
sqlite3 *conn;
int err;
if((err = sqlite3_open(req->server->app->dbname, &conn)) != SQLITE_OK) {
abort();
}
*response = malloc(4096);
char *cursor = *response;
size_t written;
written = snprintf(cursor, *response + 4096 - cursor, "{ \"page\": [ ");
if(written >= *response + 4096 - cursor) abort();
cursor += written;
{
sqlite3_stmt *stmt;
if(sqlite3_prepare_v2(conn, "SELECT c.id, c.name FROM clients c WHERE c.id > ?1 ORDER BY c.id ASC LIMIT ?2", -1, &stmt, NULL) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_int64(stmt, 1, -1) != SQLITE_OK) {
abort();
}
if(sqlite3_bind_int64(stmt, 2, 16) != SQLITE_OK) {
abort();
}
int ret;
int index = 0;
while((ret = sqlite3_step(stmt)) == SQLITE_ROW) {
assert(index < 16);
if(sqlite3_column_type(stmt, 0) == SQLITE_NULL) {
abort();
}
int64_t clientId = sqlite3_column_int64(stmt, 0);
const uint8_t *name = sqlite3_column_text(stmt, 1);
written = snprintf(cursor, *response + 4096 - cursor, "{ \"id\": \"%ld\", \"name\": \"%s\" }, ", clientId, name);
if(written >= *response + 4096 - cursor) abort();
cursor += written;
index++;
}
if(ret != SQLITE_DONE) {
abort();
}
// Remove the last comma and space
if(index > 0) cursor -= 2;
written = snprintf(cursor, *response + 4096 - cursor, " ] }");
if(written >= *response + 4096 - cursor) abort();
cursor += written;
*response_len = cursor - *response;
if(sqlite3_finalize(stmt) != SQLITE_OK) {
abort();
}
}
return 0;
}
static ssize_t file_reader(void *cls, uint64_t pos, char *buf, size_t max) {
FILE *f = cls;
fseek(f, pos, SEEK_SET);
size_t read = fread(buf, 1, max, f);
if(read > 0) {
return read;
}
if(feof(f)) {
return MHD_CONTENT_READER_END_OF_STREAM;
}
abort();
}
static void file_close(void *cls) {
FILE *f = cls;
fclose(f);
}
static enum MHD_Result create_post_collector(struct PostCollector *c) {
c->data = malloc(512);
c->size = 0;
c->capacity = 512;
return MHD_YES;
}
static enum MHD_Result collect_post(struct PostCollector *c, const char *data, size_t *data_len) {
size_t newSize = c->size + *data_len;
if(newSize > c->capacity) {
while(newSize > c->capacity) c->capacity *= 2;
c->data = realloc(c->data, c->capacity);
}
memcpy(c->data + c->size, data, *data_len);
c->size = newSize;
return MHD_YES;
}
static enum MHD_Result destroy_post_collector(struct PostCollector *c) {
if(c->capacity != 0) {
free(c->data);
c->capacity = 0;
}
return MHD_YES;
}
static enum MHD_Result handler(
void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **ptr
) {
struct Server *server = cls;
int ret;
// For the first call where con_cls points at NULL we have to create the
// connection state
struct Request *request = *ptr;
if (request == NULL) {
request = calloc(1, sizeof(struct Request));
if(request == NULL) {
return MHD_NO;
}
*ptr = request;
request->server = server;
if(strcmp(method, "POST") == 0) {
create_post_collector(&request->pp);
}
return MHD_YES;
}
if(strcmp(method, "POST") == 0) {
collect_post(&request->pp, upload_data, upload_data_size);
if (*upload_data_size != 0) {
*upload_data_size = 0;
return MHD_YES;
}
if(strcmp(url, "/api/report") == 0) {
cJSON *rootJson = cJSON_ParseWithLength(request->pp.data, request->pp.size);
cJSON *clientJson = cJSON_GetObjectItemCaseSensitive(rootJson, "client");
if(!cJSON_IsString(clientJson) || clientJson->valuestring == NULL) {
abort();
}
cJSON *eventJson = cJSON_GetObjectItemCaseSensitive(rootJson, "event");
if(!cJSON_IsString(eventJson) || eventJson->valuestring == NULL) {
abort();
}
enum ReportEvent event;
if(strcmp(eventJson->valuestring, "begin_backup") == 0) {
event = REV_BEGIN;
} else if(strcmp(eventJson->valuestring, "end_backup") == 0) {
event = REV_FINISH;
} else {
abort();
}
ret = submit_report(server->app, clientJson->valuestring, event);
if(ret != 0) {
// Should actually return an error page, but this will do for now
return MHD_NO;
}
cJSON_Delete(rootJson);
// We've taken in all the data, now we can use it
destroy_post_collector(&request->pp);
struct MHD_Response *response = MHD_create_response_from_buffer(
0,
"",
MHD_RESPMEM_PERSISTENT
);
ret = MHD_add_response_header(response, "Content-Type", "application/json");
if(ret != MHD_YES) return ret;
ret = MHD_queue_response(
connection,
MHD_HTTP_NO_CONTENT,
response
);
MHD_destroy_response(response);
return ret;
} else if(strcmp(url, "/api/client") == 0) {
cJSON *rootJson = cJSON_ParseWithLength(request->pp.data, request->pp.size);
cJSON *nameJson = cJSON_GetObjectItemCaseSensitive(rootJson, "name");
if(!cJSON_IsString(nameJson) || nameJson->valuestring == NULL) {
abort();
}
struct CreateClientResult result;
ret = create_client(request, nameJson->valuestring, &result);
if(ret != 0) {
// Should actually return an error page, but this will do for now
return MHD_NO;
}
cJSON_Delete(rootJson);
// We've taken in all the data, now we can use it
destroy_post_collector(&request->pp);
char *buf = malloc(1024);
size_t buf_len = snprintf(buf, 1024, "{ \"id\": \"%ld\" }", result.id);
if(buf_len >= 1024) {
abort();
}
struct MHD_Response *response = MHD_create_response_from_buffer(
buf_len,
buf,
MHD_RESPMEM_MUST_FREE
);
ret = MHD_add_response_header(response, "Content-Type", "application/json");
if(ret != MHD_YES) return ret;
ret = MHD_queue_response(
connection,
MHD_HTTP_OK,
response
);
MHD_destroy_response(response);
return ret;
} else {
// Not found
destroy_post_collector(&request->pp);
struct MHD_Response *response = MHD_create_response_from_buffer(
0,
"",
MHD_RESPMEM_PERSISTENT
);
ret = MHD_add_response_header(response, "Content-Type", "application/json");
if(ret != MHD_YES) return ret;
ret = MHD_queue_response(
connection,
MHD_HTTP_NOT_FOUND,
response
);
MHD_destroy_response(response);
return ret;
}
} else if (strcmp(method, "GET") == 0) {
if (*upload_data_size != 0) return MHD_NO;
if(strcmp(url, "/api/client") == 0) {
char *body;
size_t body_len;
ret = list_clients(request, &body, &body_len);
if(ret != 0) {
// Should actually return an error page, but this will do for now
return MHD_NO;
}
struct MHD_Response *response = MHD_create_response_from_buffer(
body_len,
body,
MHD_RESPMEM_MUST_FREE
);
ret = MHD_add_response_header(response, "Content-Type", "application/json");
if(ret != MHD_YES) return ret;
ret = MHD_queue_response(
connection,
MHD_HTTP_OK,
response
);
MHD_destroy_response(response);
return ret;
} else {
// @SECURITY: We should restrict this lookup. Look at openat2(2)
char path[512];
if(snprintf(path, sizeof(path), "static/%s", url) >= sizeof(path)) abort();
struct stat statbuf;
FILE *f = NULL;
if(stat(path, &statbuf) == 0 && (S_ISREG(statbuf.st_mode) || S_ISLNK(statbuf.st_mode))) {
f = fopen(path, "rb");
}
if(f != NULL) {
struct MHD_Response *response = MHD_create_response_from_callback(
statbuf.st_size, statbuf.st_blksize,
&file_reader, f,
&file_close
);
ret = MHD_queue_response(
connection,
MHD_HTTP_OK,
response
);
MHD_destroy_response(response);
return ret;
} else {
struct MHD_Response *response = MHD_create_response_from_buffer(
strlen(server->page),
(void *)server->page,
MHD_RESPMEM_PERSISTENT
);
ret = MHD_queue_response(
connection,
MHD_HTTP_OK,
response
);
MHD_destroy_response(response);
return ret;
}
}
}
return MHD_NO;
}
static void request_completed_callback (
void *cls,
struct MHD_Connection *connection,
void **con_cls,
enum MHD_RequestTerminationCode toe
) {
struct Request *request = *con_cls;
destroy_post_collector(&request->pp);
free(request);
}
static struct MHD_Daemon *d = NULL;
int web_begin(struct Server *server, int port) {
assert(d == NULL);
server->page = PAGE;
d = MHD_start_daemon(
MHD_USE_THREAD_PER_CONNECTION,
port,
NULL, NULL,
&handler, server,
MHD_OPTION_NOTIFY_COMPLETED, &request_completed_callback, NULL,
MHD_OPTION_END
);
if (d == NULL) return 1;
return 0;
}
int web_join(struct Server *server) {
assert(d != NULL);
MHD_stop_daemon(d);
d = NULL;
return 0;
}
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