relay.c

   1 /*
   2  * uhttpd - Tiny single-threaded httpd
   3  *
   4  *   Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
   5  *   Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #include <signal.h>
  21 #include "uhttpd.h"
  22
  23 void uh_relay_free(struct relay *r)
  24 {
  25         if (!r->cl)
  26                 return;
  27
  28         if (r->proc.pending)
  29                 kill(r->proc.pid, SIGKILL);
  30
  31         uloop_timeout_cancel(&r->timeout);
  32         uloop_process_delete(&r->proc);
  33         ustream_free(&r->sfd.stream);
  34         close(r->sfd.fd.fd);
  35
  36         r->cl = NULL;
  37 }
  38
  39 void uh_relay_close(struct relay *r, int ret)
  40 {
  41         struct ustream *us = &r->sfd.stream;
  42
  43         if (!us->notify_read)
  44                 return;
  45
  46         us->notify_read = NULL;
  47         us->notify_write = NULL;
  48         us->notify_state = NULL;
  49
  50         if (r->close)
  51                 r->close(r, ret);
  52 }
  53
  54 static void relay_error(struct relay *r)
  55 {
  56         struct ustream *s = &r->sfd.stream;
  57         int len;
  58
  59         r->error = true;
  60         s->eof = true;
  61         ustream_get_read_buf(s, &len);
  62         if (len)
  63                 ustream_consume(s, len);
  64         ustream_state_change(s);
  65 }
  66
  67 static void relay_process_headers(struct relay *r)
  68 {
  69         struct ustream *s = &r->sfd.stream;
  70         char *buf, *newline;
  71         int len;
  72
  73         if (!r->header_cb)
  74                 return;
  75
  76         while (r->header_cb) {
  77                 int line_len;
  78                 char *val;
  79
  80                 buf = ustream_get_read_buf(s, &len);
  81                 if (!buf || !len)
  82                         break;
  83
  84                 newline = strchr(buf, '\n');
  85                 if (!newline)
  86                         break;
  87
  88                 line_len = newline + 1 - buf;
  89                 if (newline > buf && newline[-1] == '\r')
  90                         newline--;
  91
  92                 *newline = 0;
  93                 if (newline == buf) {
  94                         r->header_cb = NULL;
  95                         if (r->header_end)
  96                                 r->header_end(r);
  97                         ustream_consume(s, line_len);
  98                         break;
  99                 }
 100
 101                 val = uh_split_header(buf);
 102                 if (!val) {
 103                         relay_error(r);
 104                         return;
 105                 }
 106
 107                 r->header_cb(r, buf, val);
 108                 ustream_consume(s, line_len);
 109         }
 110 }
 111
 112 static void relay_read_cb(struct ustream *s, int bytes)
 113 {
 114         struct relay *r = container_of(s, struct relay, sfd.stream);
 115         struct client *cl = r->cl;
 116         struct ustream *us = cl->us;
 117         char *buf;
 118         int len;
 119
 120         if (r->process_done)
 121                 uloop_timeout_set(&r->timeout, 1);
 122
 123         if (!r->error)
 124                 relay_process_headers(r);
 125
 126         if (r->header_cb) {
 127                 /*
 128                  * if eof, ensure that remaining data is discarded, so the
 129                  * state change cb will tear down the stream
 130                  */
 131                 if (s->eof)
 132                         relay_error(r);
 133                 return;
 134         }
 135
 136         if (!s->eof && ustream_pending_data(us, true)) {
 137                 ustream_set_read_blocked(s, true);
 138                 return;
 139         }
 140
 141         buf = ustream_get_read_buf(s, &len);
 142         if (!buf || !len)
 143                 return;
 144
 145         if (!r->skip_data)
 146                 uh_chunk_write(cl, buf, len);
 147
 148         ustream_consume(s, len);
 149 }
 150
 151 static void relay_close_if_done(struct uloop_timeout *timeout)
 152 {
 153         struct relay *r = container_of(timeout, struct relay, timeout);
 154         struct ustream *s = &r->sfd.stream;
 155
 156         while (ustream_poll(&r->sfd.stream));
 157
 158         if (!(r->process_done || s->eof) || ustream_pending_data(s, false))
 159                 return;
 160
 161         uh_relay_close(r, r->ret);
 162 }
 163
 164 static void relay_state_cb(struct ustream *s)
 165 {
 166         struct relay *r = container_of(s, struct relay, sfd.stream);
 167
 168         if (r->process_done)
 169                 uloop_timeout_set(&r->timeout, 1);
 170 }
 171
 172 static void relay_proc_cb(struct uloop_process *proc, int ret)
 173 {
 174         struct relay *r = container_of(proc, struct relay, proc);
 175
 176         r->process_done = true;
 177         r->ret = ret;
 178         uloop_timeout_set(&r->timeout, 1);
 179 }
 180
 181 void uh_relay_kill(struct client *cl, struct relay *r)
 182 {
 183         struct ustream *us = &r->sfd.stream;
 184
 185         kill(r->proc.pid, SIGKILL);
 186         us->eof = true;
 187         ustream_state_change(us);
 188 }
 189
 190 void uh_relay_open(struct client *cl, struct relay *r, int fd, int pid)
 191 {
 192         struct ustream *us = &r->sfd.stream;
 193
 194         r->cl = cl;
 195         us->notify_read = relay_read_cb;
 196         us->notify_state = relay_state_cb;
 197         us->string_data = true;
 198         ustream_fd_init(&r->sfd, fd);
 199
 200         r->proc.pid = pid;
 201         r->proc.cb = relay_proc_cb;
 202         uloop_process_add(&r->proc);
 203
 204         r->timeout.cb = relay_close_if_done;
 205 }