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298 lines
6.8 KiB
C
298 lines
6.8 KiB
C
#include "http.h"
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#include "server.h"
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#include "worker.h"
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#include "client.h"
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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/* HTTP Response */
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struct http_response *
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http_response_init(struct worker *w, int code, const char *msg) {
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/* create object */
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struct http_response *r = calloc(1, sizeof(struct http_response));
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r->code = code;
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r->msg = msg;
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r->w = w;
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http_response_set_header(r, "Server", "Webdis");
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/* Cross-Origin Resource Sharing, CORS. */
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http_response_set_header(r, "Allow", "GET,POST,PUT,OPTIONS");
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http_response_set_header(r, "Access-Control-Allow-Origin", "*");
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return r;
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}
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void
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http_response_set_header(struct http_response *r, const char *k, const char *v) {
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int i, pos = r->header_count;
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size_t key_sz = strlen(k);
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size_t val_sz = strlen(v);
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for(i = 0; i < r->header_count; ++i) {
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if(strncmp(r->headers[i].key, k, key_sz) == 0) {
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pos = i;
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/* free old value before replacing it. */
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free(r->headers[i].key);
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free(r->headers[i].val);
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break;
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}
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}
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/* extend array */
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if(pos == r->header_count) {
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r->headers = realloc(r->headers,
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sizeof(struct http_header)*(r->header_count + 1));
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r->header_count++;
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}
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/* copy key */
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r->headers[pos].key = calloc(key_sz + 1, 1);
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memcpy(r->headers[pos].key, k, key_sz);
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r->headers[pos].key_sz = key_sz;
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/* copy val */
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r->headers[pos].val = calloc(val_sz + 1, 1);
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memcpy(r->headers[pos].val, v, val_sz);
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r->headers[pos].val_sz = val_sz;
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if(!r->chunked && !strcmp(k, "Transfer-Encoding") && !strcmp(v, "chunked")) {
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r->chunked = 1;
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}
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}
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void
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http_response_set_body(struct http_response *r, const char *body, size_t body_len) {
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r->body = body;
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r->body_len = body_len;
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}
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static void
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http_response_cleanup(struct http_response *r, int fd, int success) {
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int i;
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/* cleanup buffer */
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free(r->out);
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if(!r->keep_alive || !success) {
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/* Close fd is client doesn't support Keep-Alive. */
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close(fd);
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}
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/* cleanup response object */
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for(i = 0; i < r->header_count; ++i) {
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free(r->headers[i].key);
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free(r->headers[i].val);
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}
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free(r->headers);
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free(r);
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}
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static void
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http_can_write(int fd, short event, void *p) {
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int ret;
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struct http_response *r = p;
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(void)event;
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ret = write(fd, r->out + r->sent, r->out_sz - r->sent);
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if(ret > 0)
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r->sent += ret;
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if(ret <= 0 || r->out_sz - r->sent == 0) { /* error or done */
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http_response_cleanup(r, fd, (int)r->out_sz == r->sent ? 1 : 0);
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} else { /* reschedule write */
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http_schedule_write(fd, r);
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}
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}
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void
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http_schedule_write(int fd, struct http_response *r) {
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if(r->w) { /* async */
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event_set(&r->ev, fd, EV_WRITE, http_can_write, r);
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event_base_set(r->w->base, &r->ev);
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event_add(&r->ev, NULL);
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} else { /* blocking */
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http_can_write(fd, 0, r);
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}
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}
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void
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http_response_write(struct http_response *r, int fd) {
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char *p;
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int i, ret;
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r->keep_alive = 0;
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r->out_sz = sizeof("HTTP/1.x xxx ")-1 + strlen(r->msg) + 2;
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r->out = calloc(r->out_sz + 1, 1);
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ret = sprintf(r->out, "HTTP/1.%d %d %s\r\n", (r->http_version?1:0), r->code, r->msg);
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(void)ret;
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p = r->out;
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if(r->code == 200 && r->body) {
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char content_length[10];
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sprintf(content_length, "%zd", r->body_len);
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http_response_set_header(r, "Content-Length", content_length);
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} else if(!r->chunked) {
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http_response_set_header(r, "Content-Length", "0");
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}
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for(i = 0; i < r->header_count; ++i) {
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/* "Key: Value\r\n" */
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size_t header_sz = r->headers[i].key_sz + 2 + r->headers[i].val_sz + 2;
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r->out = realloc(r->out, r->out_sz + header_sz);
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p = r->out + r->out_sz;
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/* add key */
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memcpy(p, r->headers[i].key, r->headers[i].key_sz);
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p += r->headers[i].key_sz;
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/* add ": " */
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*(p++) = ':';
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*(p++) = ' ';
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/* add value */
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memcpy(p, r->headers[i].val, r->headers[i].val_sz);
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p += r->headers[i].val_sz;
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/* add "\r\n" */
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*(p++) = '\r';
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*(p++) = '\n';
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r->out_sz += header_sz;
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if(strncasecmp("Connection", r->headers[i].key, r->headers[i].key_sz) == 0 &&
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strncasecmp("Keep-Alive", r->headers[i].val, r->headers[i].val_sz) == 0) {
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r->keep_alive = 1;
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}
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}
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/* end of headers */
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r->out = realloc(r->out, r->out_sz + 2);
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memcpy(r->out + r->out_sz, "\r\n", 2);
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r->out_sz += 2;
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/* append body if there is one. */
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if(r->body && r->body_len) {
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r->out = realloc(r->out, r->out_sz + r->body_len);
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memcpy(r->out + r->out_sz, r->body, r->body_len);
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r->out_sz += r->body_len;
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}
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/* send buffer to client */
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r->sent = 0;
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http_schedule_write(fd, r);
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}
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static void
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http_response_set_connection_header(struct http_client *c, struct http_response *r) {
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http_response_set_keep_alive(r, c->keep_alive);
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}
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/* Adobe flash cross-domain request */
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void
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http_crossdomain(struct http_client *c) {
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struct http_response *resp = http_response_init(NULL, 200, "OK");
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char out[] = "<?xml version=\"1.0\"?>\n"
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"<!DOCTYPE cross-domain-policy SYSTEM \"http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd\">\n"
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"<cross-domain-policy>\n"
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"<allow-access-from domain=\"*\" />\n"
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"</cross-domain-policy>\n";
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resp->http_version = c->http_version;
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http_response_set_connection_header(c, resp);
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http_response_set_header(resp, "Content-Type", "application/xml");
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http_response_set_body(resp, out, sizeof(out)-1);
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http_response_write(resp, c->fd);
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http_client_reset(c);
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}
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/* Simple error response */
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void
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http_send_error(struct http_client *c, short code, const char *msg) {
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struct http_response *resp = http_response_init(NULL, code, msg);
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resp->http_version = c->http_version;
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http_response_set_connection_header(c, resp);
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http_response_set_body(resp, NULL, 0);
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http_response_write(resp, c->fd);
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http_client_reset(c);
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}
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/**
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* Set Connection field, either Keep-Alive or Close.
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*/
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void
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http_response_set_keep_alive(struct http_response *r, int enabled) {
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if(enabled) {
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http_response_set_header(r, "Connection", "Keep-Alive");
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} else {
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http_response_set_header(r, "Connection", "Close");
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}
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}
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/* Response to HTTP OPTIONS */
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void
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http_send_options(struct http_client *c) {
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struct http_response *resp = http_response_init(NULL, 200, "OK");
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resp->http_version = c->http_version;
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http_response_set_connection_header(c, resp);
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http_response_set_header(resp, "Content-Type", "text/html");
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http_response_set_header(resp, "Content-Length", "0");
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http_response_write(resp, c->fd);
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http_client_reset(c);
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}
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/**
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* Write HTTP chunk.
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*/
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void
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http_response_write_chunk(int fd, struct worker *w, const char *p, size_t sz) {
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char *out, tmp[64];
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size_t out_sz;
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int chunk_size;
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struct http_response *r = http_response_init(w, 0, NULL);
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/* calculate format size */
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chunk_size = sprintf(tmp, "%x\r\n", (int)sz);
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out_sz = chunk_size + sz + 2;
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out = malloc(out_sz);
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memcpy(out, tmp, chunk_size);
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memcpy(out + chunk_size, p, sz);
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memcpy(out + chunk_size + sz, "\r\n", 2);
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/* send async write */
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r->out = out;
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r->out_sz = out_sz;
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http_schedule_write(fd, r);
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}
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