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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"
int uw_backlog = 10;
int uw_bufsize = 1024;
typedef struct node {
int fd;
struct node *next;
} *node;
static node front = NULL, back = NULL;
static int empty() {
return front == NULL;
}
static void enqueue(int fd) {
node n = malloc(sizeof(struct node));
n->fd = fd;
n->next = NULL;
if (back)
back->next = n;
else
front = n;
back = n;
}
static int dequeue() {
int ret = front->fd;
front = front->next;
if (!front)
back = NULL;
return ret;
}
static pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t queue_cond = PTHREAD_COND_INITIALIZER;
#define MAX_RETRIES 5
static int try_rollback(uw_context ctx) {
int r = uw_rollback(ctx);
if (r) {
printf("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;
}
static uw_context new_context() {
uw_context ctx = uw_init();
int retries_left = MAX_RETRIES;
while (1) {
failure_kind fk = uw_begin_init(ctx);
if (fk == SUCCESS) {
printf("Database connection initialized.\n");
break;
} else if (fk == BOUNDED_RETRY) {
if (retries_left) {
printf("Initialization error triggers bounded retry: %s\n", uw_error_message(ctx));
--retries_left;
} else {
printf("Fatal initialization error (out of retries): %s\n", uw_error_message(ctx));
uw_free(ctx);
return NULL;
}
} else if (fk == UNLIMITED_RETRY)
printf("Initialization error triggers unlimited retry: %s\n", uw_error_message(ctx));
else if (fk == FATAL) {
printf("Fatal initialization error: %s\n", uw_error_message(ctx));
uw_free(ctx);
return NULL;
} else {
printf("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() {
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) {
printf("Key generation failed\n");
exit(1);
}
}
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)
printf("Signing failed");
}
static void *worker(void *data) {
int me = *(int *)data, retries_left = MAX_RETRIES;
uw_context ctx = new_context();
size_t buf_size = 2;
char *buf = malloc(buf_size);
size_t path_copy_size = 0;
char *path_copy = malloc(path_copy_size);
while (1) {
char *back = buf, *s, *post;
int sock, dont_close = 0;
pthread_mutex_lock(&queue_mutex);
while (empty())
pthread_cond_wait(&queue_cond, &queue_mutex);
sock = dequeue();
pthread_mutex_unlock(&queue_mutex);
printf("Handling connection with thread #%d.\n", me);
while (1) {
unsigned retries_left = MAX_RETRIES;
int r;
if (back - buf == buf_size - 1) {
char *new_buf;
buf_size *= 2;
new_buf = realloc(buf, buf_size);
back = new_buf + (back - buf);
buf = new_buf;
}
r = recv(sock, back, buf_size - 1 - (back - buf), 0);
if (r < 0) {
fprintf(stderr, "Recv failed\n");
break;
}
if (r == 0) {
printf("Connection closed.\n");
break;
}
//printf("Received %d bytes.\n", r);
back += r;
*back = 0;
if (s = strstr(buf, "\r\n\r\n")) {
failure_kind fk;
int is_post = 0, do_normal_send = 1;
char *boundary = NULL;
size_t boundary_len;
char *cmd, *path, *headers, *inputs, *after_headers;
//printf("All: %s\n", buf);
s[2] = 0;
after_headers = s + 4;
if (!(s = strstr(buf, "\r\n"))) {
fprintf(stderr, "No newline in buf\n");
break;
}
*s = 0;
headers = s + 2;
cmd = s = buf;
//printf("Read: %s\n", buf);
if (!strsep(&s, " ")) {
fprintf(stderr, "No first space in HTTP command\n");
break;
}
uw_set_headers(ctx, headers);
if (!strcmp(cmd, "POST")) {
char *clen_s = uw_Basis_requestHeader(ctx, "Content-length");
if (!clen_s) {
fprintf(stderr, "No Content-length with POST\n");
goto done;
}
int clen = atoi(clen_s);
if (clen < 0) {
fprintf(stderr, "Negative Content-length with POST\n");
goto done;
}
while (back - after_headers < clen) {
if (back - buf == buf_size - 1) {
char *new_buf;
buf_size *= 2;
new_buf = realloc(buf, buf_size);
back = new_buf + (back - buf);
headers = new_buf + (headers - buf);
uw_headers_moved(ctx, headers);
after_headers = new_buf + (after_headers - buf);
s = new_buf + (s - buf);
buf = new_buf;
}
r = recv(sock, back, buf_size - 1 - (back - buf), 0);
if (r < 0) {
fprintf(stderr, "Recv failed\n");
goto done;
}
if (r == 0) {
printf("Connection closed.\n");
goto done;
}
back += r;
*back = 0;
}
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)) {
fprintf(stderr, "Bad multipart boundary spec");
break;
}
boundary = clen_s + 28;
boundary[0] = '-';
boundary[1] = '-';
boundary_len = strlen(boundary);
}
} else if (strcmp(cmd, "GET")) {
fprintf(stderr, "Not ready for non-GET/POST command: %s\n", cmd);
break;
}
path = s;
if (!strsep(&s, " ")) {
fprintf(stderr, "No second space in HTTP command\n");
break;
}
if (!strcmp(path, "/.msgs")) {
char *id = uw_Basis_requestHeader(ctx, "UrWeb-Client");
char *pass = uw_Basis_requestHeader(ctx, "UrWeb-Pass");
if (id && pass) {
unsigned idn = atoi(id);
uw_client_connect(idn, atoi(pass), sock);
dont_close = 1;
fprintf(stderr, "Processed request for messages by client %u\n\n", idn);
}
else {
fprintf(stderr, "Missing fields in .msgs request: %s, %s\n\n", id, pass);
}
break;
}
if (boundary) {
char *part = after_headers, *after_sub_headers, *header, *after_header;
size_t part_len;
part = strstr(part, boundary);
if (!part) {
fprintf(stderr, "Missing first multipart boundary\n");
break;
}
part += boundary_len;
while (1) {
char *name = NULL, *filename = NULL, *type = NULL;
if (part[0] == '-' && part[1] == '-')
break;
if (*part != '\r') {
fprintf(stderr, "No \\r after multipart boundary\n");
goto done;
}
++part;
if (*part != '\n') {
fprintf(stderr, "No \\n after multipart boundary\n");
goto done;
}
++part;
if (!(after_sub_headers = strstr(part, "\r\n\r\n"))) {
fprintf(stderr, "Missing end of headers after multipart boundary\n");
goto done;
}
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, ':'))) {
fprintf(stderr, "Missing colon in multipart sub-header\n");
goto done;
}
*colon++ = 0;
if (*colon++ != ' ') {
fprintf(stderr, "No space after colon in multipart sub-header\n");
goto done;
}
if (!strcasecmp(header, "Content-Disposition")) {
if (strncmp(colon, "form-data; ", 11)) {
fprintf(stderr, "Multipart data is not \"form-data\"\n");
goto done;
}
for (colon += 11; after_colon = strchr(colon, '='); colon = after_colon) {
char *data;
after_colon[0] = 0;
if (after_colon[1] != '"') {
fprintf(stderr, "Disposition setting is missing initial quote\n");
goto done;
}
data = after_colon+2;
if (!(after_colon = strchr(data, '"'))) {
fprintf(stderr, "Disposition setting is missing final quote\n");
goto done;
}
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, back - after_sub_headers, boundary, boundary_len);
if (!part) {
fprintf(stderr, "Missing boundary after multipart payload\n");
goto done;
}
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)) {
puts(uw_error_message(ctx));
goto done;
}
} else if (uw_set_input(ctx, name, after_sub_headers)) {
puts(uw_error_message(ctx));
goto done;
}
}
}
else {
if (is_post)
inputs = after_headers;
else if (inputs = strchr(path, '?'))
*inputs++ = 0;
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)) {
puts(uw_error_message(ctx));
goto done;
}
}
else if (uw_set_input(ctx, name, "")) {
puts(uw_error_message(ctx));
goto done;
}
}
}
}
printf("Serving URI %s....\n", path);
while (1) {
size_t path_len = strlen(path);
uw_write_header(ctx, "HTTP/1.1 200 OK\r\n");
if (path_len + 1 > path_copy_size) {
path_copy_size = path_len + 1;
path_copy = realloc(path_copy, path_copy_size);
}
strcpy(path_copy, path);
fk = uw_begin(ctx, path_copy);
if (fk == SUCCESS || fk == RETURN_BLOB) {
uw_commit(ctx);
break;
} else if (fk == BOUNDED_RETRY) {
if (retries_left) {
printf("Error triggers bounded retry: %s\n", uw_error_message(ctx));
--retries_left;
}
else {
printf("Fatal error (out of retries): %s\n", uw_error_message(ctx));
try_rollback(ctx);
uw_reset_keep_error_message(ctx);
uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
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");
break;
}
} else if (fk == UNLIMITED_RETRY)
printf("Error triggers unlimited retry: %s\n", uw_error_message(ctx));
else if (fk == FATAL) {
printf("Fatal error: %s\n", uw_error_message(ctx));
try_rollback(ctx);
uw_reset_keep_error_message(ctx);
uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\r\n");
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>");
break;
} else {
printf("Unknown uw_handle return code!\n");
try_rollback(ctx);
uw_reset_keep_request(ctx);
uw_write_header(ctx, "HTTP/1.1 500 Internal Server Error\n\r");
uw_write_header(ctx, "Content-type: text/plain\r\n");
uw_write(ctx, "Unknown uw_handle return code!\n");
break;
}
if (try_rollback(ctx))
break;
uw_reset_keep_request(ctx);
}
uw_send(ctx, sock);
printf("Done with client.\n\n");
uw_memstats(ctx);
break;
}
}
done:
if (!dont_close)
close(sock);
uw_reset(ctx);
}
}
static void *client_pruner(void *data) {
uw_context ctx = new_context();
if (!ctx)
exit(1);
while (1) {
uw_prune_clients(ctx);
sleep(5);
}
}
static void help(char *cmd) {
printf("Usage: %s [-p <port>] [-t <thread-count>]\n", cmd);
}
static void sigint(int signum) {
printf("Exiting....\n");
exit(0);
}
static void initialize() {
uw_context ctx;
failure_kind fk;
init_crypto();
ctx = new_context();
if (!ctx)
exit(1);
for (fk = uw_initialize(ctx); fk == UNLIMITED_RETRY; fk = uw_initialize(ctx)) {
printf("Unlimited retry during init: %s\n", uw_error_message(ctx));
uw_db_rollback(ctx);
uw_reset(ctx);
}
if (fk != SUCCESS) {
printf("Failed to initialize database! %s\n", uw_error_message(ctx));
uw_db_rollback(ctx);
exit(1);
}
uw_free(ctx);
}
int main(int argc, char *argv[]) {
// The skeleton for this function comes from Beej's sockets tutorial.
int sockfd; // listen on sock_fd
struct sockaddr_in my_addr;
struct sockaddr_in their_addr; // connector's address information
int sin_size, yes = 1;
int uw_port = 8080, nthreads = 1, i, *names, opt;
signal(SIGINT, sigint);
signal(SIGPIPE, SIG_IGN);
while ((opt = getopt(argc, argv, "hp:t:")) != -1) {
switch (opt) {
case '?':
fprintf(stderr, "Unknown command-line option");
help(argv[0]);
return 1;
case 'h':
help(argv[0]);
return 0;
case 'p':
uw_port = atoi(optarg);
if (uw_port <= 0) {
fprintf(stderr, "Invalid port number\n");
help(argv[0]);
return 1;
}
break;
case 't':
nthreads = atoi(optarg);
if (nthreads <= 0) {
fprintf(stderr, "Invalid thread count\n");
help(argv[0]);
return 1;
}
break;
default:
fprintf(stderr, "Unexpected getopt() behavior\n");
return 1;
}
}
uw_global_init();
initialize();
names = calloc(nthreads, sizeof(int));
sockfd = socket(PF_INET, SOCK_STREAM, 0); // do some error checking!
if (sockfd < 0) {
fprintf(stderr, "Listener socket creation failed\n");
return 1;
}
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) < 0) {
fprintf(stderr, "Listener socket option setting failed\n");
return 1;
}
my_addr.sin_family = AF_INET; // host byte order
my_addr.sin_port = htons(uw_port); // short, network byte order
my_addr.sin_addr.s_addr = INADDR_ANY; // auto-fill with my IP
memset(my_addr.sin_zero, '\0', sizeof my_addr.sin_zero);
if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr) < 0) {
fprintf(stderr, "Listener socket bind failed\n");
return 1;
}
if (listen(sockfd, uw_backlog) < 0) {
fprintf(stderr, "Socket listen failed\n");
return 1;
}
sin_size = sizeof their_addr;
printf("Listening on port %d....\n", uw_port);
{
pthread_t thread;
int name;
if (pthread_create(&thread, NULL, client_pruner, &name)) {
fprintf(stderr, "Error creating pruner thread\n");
return 1;
}
}
for (i = 0; i < nthreads; ++i) {
pthread_t thread;
names[i] = i;
if (pthread_create(&thread, NULL, worker, &names[i])) {
fprintf(stderr, "Error creating worker thread #%d\n", i);
return 1;
}
}
while (1) {
int new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
if (new_fd < 0) {
fprintf(stderr, "Socket accept failed\n");
return 1;
}
printf("Accepted connection.\n");
pthread_mutex_lock(&queue_mutex);
enqueue(new_fd);
pthread_cond_broadcast(&queue_cond);
pthread_mutex_unlock(&queue_mutex);
}
}
|