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#include <netinet/in.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <sys/sendfile.h>
#include <fcntl.h>
#include <unistd.h>
#include <poll.h>
#include <err.h>
#include <errno.h>
#include <pthread.h>
void send_answer(void * new_socket) {
FILE * f = fdopen((size_t) new_socket, "w");
puts("> sending answer...");
fputs("HTTP/1.0 200 OK\n", f);
fputs("content-type: text/html\n\n", f);
fputs("<html>", f);
fputs("<head>", f);
fputs("<title>test</title>", f);
fputs("<style>label { display:block }</style>", f);
fputs("</head>", f);
fputs("<form action=\"/\" method=\"post\" enctype=\"multipart/form-data\">", f);
fputs("<label>Line1<br/>\n", f);
fputs("<textarea type=\"text\" name=\"text\"></textarea>", f);
fputs("</label><br/>\n", f);
fputs("<input type=\"file\" name=\"okay\" value=\"ok\" />", f);
fputs("<input type=\"submit\" name=\"okay\" value=\"ok\" />", f);
fputs("</form>", f);
fputs("</html>\n\0", f);
fflush(f);
puts("> answer sent.");
fclose(f);
}
// #define FOREACH_HEADER(HEADER) \
// HEADER("Content-Type: multipart/form-data; boundary=")
// #define GENERATE_HEADERS(H) sizeof(H), H
//
// typedef struct {
// const int length;
// const char * string;
// } length_value;
//
// const length_value headers[] = {
// FOREACH_HEADER(GENERATE_HEADERS)
// };
void * next_customer(void * new_socket) {
if (new_socket == 0) return NULL;
const int MAX_HEADER_LINE_LENGTH = 1024;
const int MAX_BOUNDARY_LENGTH = 64;
char boundary[64] = {0};
int boundary_size = 0;
char current_name[64] = {0};
usleep(100); // wait to avoid poll, epoll or evil select
char * output_buffer = NULL;
size_t output_buffer_length = 0;
FILE * output = open_memstream(&output_buffer, &output_buffer_length);
FILE * f = fdopen((size_t) new_socket, "r");
char buffer[MAX_HEADER_LINE_LENGTH];
char * s = NULL;
while(1) {
// printf("[errno: %d] %s", errno, buffer);
s = fgets(buffer, MAX_HEADER_LINE_LENGTH, f);
if(boundary[0] != '\0' && buffer[0] == '-') { // first char minus. could be a new chunk of post data
int i = 0;
for(i = 1; i < MAX_HEADER_LINE_LENGTH; i++) {
if(buffer[i] != '-') { // skip all minus
if(0 == strncmp(&buffer[i], boundary, boundary_size)) {
fflush(output);
printf("> name='%s' value='%*s'\n", current_name, (int) output_buffer_length, output_buffer);
setenv(current_name, output_buffer, 0);
current_name[0] = '\0';
rewind(output);
i = 0;
puts("================================================================================");
}
break;
}
}
if (i == 0) continue;
}
if(!s || strspn(buffer, "\n\r") > 0) { // either LF or CR/LF (windows)
puts("END HEADER\n");
// s != NULL ? break : continue;
if(!s) break; else continue; // either eof or only end of (chunk-)header
}
const char header_multipart[] = "Content-Type: multipart/form-data; boundary=";
if (!boundary[0] && 0 == strncasecmp(buffer, header_multipart, sizeof(header_multipart) - 1)) {
// we could potentially optimize this part with strspn and moving the buffer point, why not?
for(int i=sizeof(header_multipart); i<MAX_HEADER_LINE_LENGTH; i++)
if(buffer[i] != '-') {
strncpy(boundary, &buffer[i], 64);
boundary_size = strnlen(boundary, 64);
boundary[boundary_size] = '\0';
printf("> [%s] %s\n", header_multipart, boundary);
break;
}
continue;
}
const char header_disposition[] = "Content-Disposition: form-data; ";
if (boundary[0] && 0 == strncasecmp(header_disposition, buffer, sizeof(header_disposition) - 1)) {
printf("> %s :: %s\n", header_disposition, buffer);
const char header_disposition_name[] = "name=\"";
s = strstr(&buffer[sizeof(header_disposition) - 1], header_disposition_name);
if(s) {
s += sizeof(header_disposition_name) - 1;
s[strcspn(s, "\"")] = '\0';
strncpy(current_name, s, 64);
printf("> /%s.*%s/ :: \"%s\"\n", header_disposition, header_disposition_name, s);
} else {
warnx("string not found in \"%s\".", &buffer[sizeof(header_disposition)]);
}
continue;
}// else { printf("FUCK: %*s [%d/%ld]\n", (int) sizeof(header_disposition), buffer, strncasecmp(header_disposition, buffer, sizeof(header_disposition)), sizeof(header_disposition)); }
printf("> [unknown] %s", buffer);
fputs(buffer, output);
// I think another if could now search for "Content-Disposition: form-data; " and store the remaining fields
// somewhere, e.g. name="okay"; filename="1.gif". Also there may also be a content-type per chunk, which we
// could also add and erase, where I have currently NEXT CHUNK.
// After that the text output (printf("%s", buffer)) will only contain content without headers, so that printf
// can then be replaced with some fwrite to a memstream and we are done :)
}
puts("> sending answer...");
send_answer(new_socket);
puts("> answer sent.");
puts("> file closed.");
//close((size_t) new_socket);
// pthread_exit(EXIT_SUCCESS);
return NULL;
}
void serve(int server_fd)
{
struct sockaddr_in address;
int addrlen = sizeof(address);
warn("waiting for connections on %d", server_fd);
for(size_t new_socket = 0
; 1 ; new_socket=accept(server_fd, (struct sockaddr*) &address, (socklen_t*) &addrlen))
{
warn("next: %ld\n", new_socket);
// set non blocking mode...
fcntl((size_t) new_socket, F_SETFL,
fcntl((size_t) new_socket, F_GETFL) | O_NONBLOCK);
next_customer((void*) new_socket);
// pthread_t thread_id;
// pthread_create(&thread_id, NULL, next_customer, (void*) new_socket);
// pthread_join(thread_id, NULL);
}
}
#define PORT 8080
int main(int argc, char const *argv[])
{
int server_fd;
int opt = 1;
struct sockaddr_in address;
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(PORT);
0 == (server_fd = socket(AF_INET, SOCK_STREAM, 0))
? err(errno, NULL)
: setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))
? err(errno, "setsockopt failed on socket with fileno %d", server_fd)
: bind(server_fd, (struct sockaddr*) &address, sizeof(address))
? err(errno, NULL)
: listen(server_fd, SOMAXCONN)
? err(errno, NULL)
: serve(server_fd);
return 0;
}
// vim: shiftwidth=2 tabstop=2 number
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