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#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <signal.h>
#include <pthread.h>
#include <mhash.h>
#include "urweb.h"
#define MAX_RETRIES 5
static int try_rollback(uw_context ctx, void *logger_data, uw_logger log_error) {
int r = uw_rollback(ctx);
if (r) {
log_error(logger_data, "Error running SQL ROLLBACK\n");
uw_reset(ctx);
uw_write(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
uw_write(ctx, "Content-type: text/plain\r\n\r\n");
uw_write(ctx, "Error running SQL ROLLBACK\n");
}
return r;
}
uw_context uw_request_new_context(void *logger_data, uw_logger log_error, uw_logger log_debug) {
uw_context ctx = uw_init();
int retries_left = MAX_RETRIES;
while (1) {
failure_kind fk = uw_begin_init(ctx);
if (fk == SUCCESS) {
log_debug(logger_data, "Database connection initialized.\n");
break;
} else if (fk == BOUNDED_RETRY) {
if (retries_left) {
log_debug(logger_data, "Initialization error triggers bounded retry: %s\n", uw_error_message(ctx));
--retries_left;
} else {
log_error(logger_data, "Fatal initialization error (out of retries): %s\n", uw_error_message(ctx));
uw_free(ctx);
return NULL;
}
} else if (fk == UNLIMITED_RETRY)
log_debug(logger_data, "Initialization error triggers unlimited retry: %s\n", uw_error_message(ctx));
else if (fk == FATAL) {
log_error(logger_data, "Fatal initialization error: %s\n", uw_error_message(ctx));
uw_free(ctx);
return NULL;
} else {
log_error(logger_data, "Unknown uw_begin_init return code!\n");
uw_free(ctx);
return NULL;
}
}
return ctx;
}
#define KEYSIZE 16
#define PASSSIZE 4
#define HASH_ALGORITHM MHASH_SHA256
#define HASH_BLOCKSIZE 32
#define KEYGEN_ALGORITHM KEYGEN_MCRYPT
int uw_hash_blocksize = HASH_BLOCKSIZE;
static int password[PASSSIZE];
static unsigned char private_key[KEYSIZE];
static void init_crypto(void *logger_data, uw_logger log_error) {
KEYGEN kg = {{HASH_ALGORITHM, HASH_ALGORITHM}};
int i;
assert(mhash_get_block_size(HASH_ALGORITHM) == HASH_BLOCKSIZE);
for (i = 0; i < PASSSIZE; ++i)
password[i] = rand();
if (mhash_keygen_ext(KEYGEN_ALGORITHM, kg,
private_key, sizeof(private_key),
(unsigned char*)password, sizeof(password)) < 0) {
log_error(logger_data, "Key generation failed\n");
exit(1);
}
}
void uw_request_init(void *logger_data, uw_logger log_error, uw_logger log_debug) {
uw_context ctx;
failure_kind fk;
uw_global_init();
ctx = uw_request_new_context(logger_data, log_error, log_debug);
if (!ctx)
exit(1);
for (fk = uw_initialize(ctx); fk == UNLIMITED_RETRY; fk = uw_initialize(ctx)) {
log_debug(logger_data, "Unlimited retry during init: %s\n", uw_error_message(ctx));
uw_db_rollback(ctx);
uw_reset(ctx);
}
if (fk != SUCCESS) {
log_error(logger_data, "Failed to initialize database! %s\n", uw_error_message(ctx));
uw_db_rollback(ctx);
exit(1);
}
uw_free(ctx);
init_crypto(logger_data, log_error);
}
void uw_sign(const char *in, char *out) {
MHASH td;
td = mhash_hmac_init(HASH_ALGORITHM, private_key, sizeof(private_key),
mhash_get_hash_pblock(HASH_ALGORITHM));
mhash(td, in, strlen(in));
if (mhash_hmac_deinit(td, out) < 0)
fprintf(stderr, "Signing failed\n");
}
typedef struct uw_rc {
size_t path_copy_size;
char *path_copy;
} *uw_request_context;
uw_request_context uw_new_request_context(void) {
uw_request_context r = malloc(sizeof(struct uw_rc));
r->path_copy_size = 0;
r->path_copy = malloc(0);
return r;
}
void uw_free_request_context(uw_request_context r) {
free(r->path_copy);
free(r);
}
request_result uw_request(uw_request_context rc, uw_context ctx,
char *method, char *path, char *query_string,
char *body, size_t body_len,
void (*on_success)(uw_context), void (*on_failure)(uw_context),
void *logger_data, uw_logger log_error, uw_logger log_debug,
int sock) {
int retries_left = MAX_RETRIES;
char *s;
failure_kind fk;
int is_post = 0, do_normal_send = 1;
char *boundary = NULL;
size_t boundary_len;
char *inputs;
if (!strcmp(method, "POST")) {
char *clen_s = uw_Basis_requestHeader(ctx, "Content-length");
if (!clen_s) {
log_error(logger_data, "No Content-length with POST\n");
return FAILED;
}
int clen = atoi(clen_s);
if (clen < 0) {
log_error(logger_data, "Negative Content-length with POST\n");
return FAILED;
}
if (body_len < clen) {
log_error(logger_data, "Request doesn't contain all POST data (according to Content-Length)\n");
return FAILED;
}
is_post = 1;
clen_s = uw_Basis_requestHeader(ctx, "Content-type");
if (clen_s && !strncasecmp(clen_s, "multipart/form-data", 19)) {
if (strncasecmp(clen_s + 19, "; boundary=", 11)) {
log_error(logger_data, "Bad multipart boundary spec");
return FAILED;
}
boundary = clen_s + 28;
boundary[0] = '-';
boundary[1] = '-';
boundary_len = strlen(boundary);
}
} else if (strcmp(method, "GET")) {
log_error(logger_data, "Not ready for non-GET/POST command: %s\n", method);
return FAILED;
}
if (!strcmp(path, "/.msgs")) {
char *id = uw_Basis_requestHeader(ctx, "UrWeb-Client");
char *pass = uw_Basis_requestHeader(ctx, "UrWeb-Pass");
if (sock < 0) {
log_error(logger_data, ".msgs requested, but not socket supplied\n");
return FAILED;
}
if (id && pass) {
unsigned idn = atoi(id);
uw_client_connect(idn, atoi(pass), sock);
log_error(logger_data, "Processed request for messages by client %u\n\n", idn);
return KEEP_OPEN;
}
else {
log_error(logger_data, "Missing fields in .msgs request: %s, %s\n\n", id, pass);
return FAILED;
}
}
if (boundary) {
char *part = body, *after_sub_headers, *header, *after_header;
size_t part_len;
part = strstr(part, boundary);
if (!part) {
log_error(logger_data, "Missing first multipart boundary\n");
return FAILED;
}
part += boundary_len;
while (1) {
char *name = NULL, *filename = NULL, *type = NULL;
if (part[0] == '-' && part[1] == '-')
break;
if (*part != '\r') {
log_error(logger_data, "No \\r after multipart boundary\n");
return FAILED;
}
++part;
if (*part != '\n') {
log_error(logger_data, "No \\n after multipart boundary\n");
return FAILED;
}
++part;
if (!(after_sub_headers = strstr(part, "\r\n\r\n"))) {
log_error(logger_data, "Missing end of headers after multipart boundary\n");
return FAILED;
}
after_sub_headers[2] = 0;
after_sub_headers += 4;
for (header = part; after_header = strstr(header, "\r\n"); header = after_header + 2) {
char *colon, *after_colon;
*after_header = 0;
if (!(colon = strchr(header, ':'))) {
log_error(logger_data, "Missing colon in multipart sub-header\n");
return FAILED;
}
*colon++ = 0;
if (*colon++ != ' ') {
log_error(logger_data, "No space after colon in multipart sub-header\n");
return FAILED;
}
if (!strcasecmp(header, "Content-Disposition")) {
if (strncmp(colon, "form-data; ", 11)) {
log_error(logger_data, "Multipart data is not \"form-data\"\n");
return FAILED;
}
for (colon += 11; after_colon = strchr(colon, '='); colon = after_colon) {
char *data;
after_colon[0] = 0;
if (after_colon[1] != '"') {
log_error(logger_data, "Disposition setting is missing initial quote\n");
return FAILED;
}
data = after_colon+2;
if (!(after_colon = strchr(data, '"'))) {
log_error(logger_data, "Disposition setting is missing final quote\n");
return FAILED;
}
after_colon[0] = 0;
++after_colon;
if (after_colon[0] == ';' && after_colon[1] == ' ')
after_colon += 2;
if (!strcasecmp(colon, "name"))
name = data;
else if (!strcasecmp(colon, "filename"))
filename = data;
}
} else if (!strcasecmp(header, "Content-Type")) {
type = colon;
}
}
part = memmem(after_sub_headers, body + body_len - after_sub_headers, boundary, boundary_len);
if (!part) {
log_error(logger_data, "Missing boundary after multipart payload\n");
return FAILED;
}
part[-2] = 0;
part_len = part - after_sub_headers - 2;
part[0] = 0;
part += boundary_len;
if (filename) {
uw_Basis_file f = {filename, type, {part_len, after_sub_headers}};
if (uw_set_file_input(ctx, name, f)) {
log_error(logger_data, "%s\n", uw_error_message(ctx));
return FAILED;
}
} else if (uw_set_input(ctx, name, after_sub_headers)) {
log_error(logger_data, "%s\n", uw_error_message(ctx));
return FAILED;
}
}
}
else {
inputs = is_post ? body : query_string;
if (inputs) {
char *name, *value;
while (*inputs) {
name = inputs;
if (inputs = strchr(inputs, '&'))
*inputs++ = 0;
else
inputs = strchr(name, 0);
if (value = strchr(name, '=')) {
*value++ = 0;
if (uw_set_input(ctx, name, value)) {
log_error(logger_data, "%s\n", uw_error_message(ctx));
return FAILED;
}
}
else if (uw_set_input(ctx, name, "")) {
log_error(logger_data, "%s\n", uw_error_message(ctx));
return FAILED;
}
}
}
}
log_debug(logger_data, "Serving URI %s....\n", path);
while (1) {
size_t path_len = strlen(path);
on_success(ctx);
if (path_len + 1 > rc->path_copy_size) {
rc->path_copy_size = path_len + 1;
rc->path_copy = realloc(rc->path_copy, rc->path_copy_size);
}
strcpy(rc->path_copy, path);
fk = uw_begin(ctx, rc->path_copy);
if (fk == SUCCESS || fk == RETURN_BLOB) {
uw_commit(ctx);
return SERVED;
} else if (fk == BOUNDED_RETRY) {
if (retries_left) {
log_debug(logger_data, "Error triggers bounded retry: %s\n", uw_error_message(ctx));
--retries_left;
}
else {
log_error(logger_data, "Fatal error (out of retries): %s\n", uw_error_message(ctx));
try_rollback(ctx, logger_data, log_error);
uw_reset_keep_error_message(ctx);
on_failure(ctx);
uw_write_header(ctx, "Content-type: text/plain\r\n");
uw_write(ctx, "Fatal error (out of retries): ");
uw_write(ctx, uw_error_message(ctx));
uw_write(ctx, "\n");
return FAILED;
}
} else if (fk == UNLIMITED_RETRY)
log_debug(logger_data, "Error triggers unlimited retry: %s\n", uw_error_message(ctx));
else if (fk == FATAL) {
log_error(logger_data, "Fatal error: %s\n", uw_error_message(ctx));
try_rollback(ctx, logger_data, log_error);
uw_reset_keep_error_message(ctx);
on_failure(ctx);
uw_write_header(ctx, "Content-type: text/html\r\n");
uw_write(ctx, "<html><head><title>Fatal Error</title></head><body>");
uw_write(ctx, "Fatal error: ");
uw_write(ctx, uw_error_message(ctx));
uw_write(ctx, "\n</body></html>");
return FAILED;
} else {
log_error(logger_data, "Unknown uw_handle return code!\n");
try_rollback(ctx, logger_data, log_error);
uw_reset_keep_request(ctx);
on_failure(ctx);
uw_write_header(ctx, "Content-type: text/plain\r\n");
uw_write(ctx, "Unknown uw_handle return code!\n");
return FAILED;
}
if (try_rollback(ctx, logger_data, log_error))
return FAILED;
uw_reset_keep_request(ctx);
}
}
typedef struct {
void *logger_data;
uw_logger log_error, log_debug;
} loggers;
void *client_pruner(void *data) {
loggers *ls = (loggers *)data;
uw_context ctx = uw_request_new_context(ls->logger_data, ls->log_error, ls->log_debug);
if (!ctx)
exit(1);
while (1) {
uw_prune_clients(ctx);
sleep(5);
}
}
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