/**
* coopgammad -- Cooperative gamma server
* Copyright (C) 2016 Mattias Andrée (maandree@kth.se)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "server.h"
#include "chaining.h"
#include "../state.h"
#include "../communication.h"
#include "../util.h"
#include "../gamma-server/server.h"
#include <libclut.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
/**
* Handle a closed connection
*
* @param client The file descriptor for the client
* @return Zero on success, -1 on error
*/
int connection_closed(int client)
{
size_t i, j, k;
int remove;
for (i = 0; i < outputs_n; i++)
{
struct output* output = outputs + i;
ssize_t updated = -1;
for (j = k = 0; j < output->table_size; j += !remove, k++)
{
remove = output->table_filters[j].client == client;
remove = remove && (output->table_filters[j].lifespan == LIFESPAN_UNTIL_DEATH);
if (remove)
{
filter_destroy(output->table_filters + j);
libgamma_gamma_ramps8_destroy(&(output->table_sums[j].u8));
output->table_size -= 1;
if (updated == -1)
updated = (ssize_t)j;
}
output->table_filters[j] = output->table_filters[k];
output->table_sums[j] = output->table_sums[k];
}
if (updated >= 0)
if (flush_filters(output, (size_t)updated) < 0)
return -1;
}
return 0;
}
/**
* Handle a ‘Command: get-gamma’ message
*
* @param conn The index of the connection
* @param message_id The value of the ‘Message ID’ header
* @param crtc The value of the ‘CRTC’ header
* @param coalesce The value of the ‘Coalesce’ header
* @param high_priority The value of the ‘High priority’ header
* @param low_priority The value of the ‘Low priority’ header
* @return Zero on success (even if ignored), -1 on error,
* 1 if connection closed
*/
int handle_get_gamma(size_t conn, const char* restrict message_id, const char* restrict crtc,
const char* restrict coalesce, const char* restrict high_priority,
const char* restrict low_priority)
{
struct output* restrict output;
int64_t high, low;
int coal;
char* restrict buf;
size_t start, end, len, n, i;
char depth[3];
char tables[sizeof("Tables: \n") + 3 * sizeof(size_t)];
if (crtc == NULL) return send_error("protocol error: 'CRTC' header omitted");
if (coalesce == NULL) return send_error("protocol error: 'Coalesce' header omitted");
if (high_priority == NULL) return send_error("protocol error: 'High priority' header omitted");
if (low_priority == NULL) return send_error("protocol error: 'Low priority' header omitted");
high = (int64_t)atoll(high_priority);
low = (int64_t)atoll(low_priority);
if (!strcmp(coalesce, "yes"))
coal = 1;
else if (!strcmp(coalesce, "no"))
coal = 0;
else
return send_error("protocol error: recognised value for 'Coalesce' header");
output = output_find_by_name(crtc, outputs, outputs_n);
if (output == NULL)
return send_error("selected CRTC does not exist");
else if (output->supported == LIBGAMMA_NO)
return send_error("selected CRTC does not support gamma adjustments");
for (start = 0; start < output->table_size; start++)
if (output->table_filters[start].priority <= high)
break;
for (end = output->table_size; end > 0; end--)
if (output->table_filters[end - 1].priority >= low)
break;
switch (output->depth)
{
case -2: strcpy(depth, "d"); break;
case -1: strcpy(depth, "f"); break;
default:
sprintf(depth, "%i", output->depth);
break;
}
if (coal)
{
*tables = '\0';
n = output->ramps_size;
}
else
{
sprintf(tables, "Tables: %zu\n", end - start);
n = (sizeof(int64_t) + output->ramps_size) * (end - start);
for (i = start; i < end; i++)
n += strlen(output->table_filters[i].class) + 1;
}
MAKE_MESSAGE(&buf, &n, 0,
"In response to: %s\n"
"Depth: %s\n"
"Red size: %zu\n"
"Green size: %zu\n"
"Blue size: %zu\n"
"%s"
"Length: %zu\n"
"\n",
message_id, depth, output->red_size, output->green_size,
output->blue_size, tables, n);
if (coal)
{
if (start == 0)
memcpy(buf + n, output->table_sums[end].u8.red, output->ramps_size);
else
{
union gamma_ramps ramps;
if (make_plain_ramps(&ramps, output))
{
int saved_errno = errno;
free(buf);
errno = saved_errno;
return -1;
}
for (i = start; i < end; i++)
apply_filter(&ramps, output->table_filters[i].ramps, output->depth, &ramps);
memcpy(buf + n, ramps.u8.red, output->ramps_size);
libgamma_gamma_ramps8_destroy(&(ramps.u8));
}
n += output->ramps_size;
}
else
for (i = start; i < end; i++)
{
#if defined(__clang__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wcast-align"
#endif
*(int64_t*)(buf + n) = output->table_filters[i].priority;
#if defined(__clang__)
# pragma GCC diagnostic pop
#endif
n += sizeof(int64_t);
len = strlen(output->table_filters[i].class) + 1;
memcpy(buf + n, output->table_filters[i].class, len);
n += len;
memcpy(buf + n, output->table_filters[i].ramps, output->ramps_size);
n += output->ramps_size;
}
return send_message(conn, buf, n);
}
/**
* Handle a ‘Command: set-gamma’ message
*
* @param conn The index of the connection
* @param message_id The value of the ‘Message ID’ header
* @param crtc The value of the ‘CRTC’ header
* @param priority The value of the ‘Priority’ header
* @param class The value of the ‘Class’ header
* @param lifespan The value of the ‘Lifespan’ header
* @return Zero on success (even if ignored), -1 on error,
* 1 if connection closed
*/
int handle_set_gamma(size_t conn, const char* restrict message_id, const char* restrict crtc,
const char* restrict priority, const char* restrict class, const char* restrict lifespan)
{
struct message* restrict msg = inbound + conn;
struct output* restrict output = NULL;
struct filter filter;
char* restrict p;
char* restrict q;
int saved_errno;
ssize_t r;
if (crtc == NULL) return send_error("protocol error: 'CRTC' header omitted");
if (class == NULL) return send_error("protocol error: 'Class' header omitted");
if (lifespan == NULL) return send_error("protocol error: 'Lifespan' header omitted");
filter.client = connections[conn];
filter.priority = priority == NULL ? 0 : (int64_t)atoll(priority);
filter.ramps = NULL;
output = output_find_by_name(crtc, outputs, outputs_n);
if (output == NULL)
return send_error("CRTC does not exists");
p = strstr(class, "::");
if ((p == NULL) || (p == class))
return send_error("protocol error: malformatted value for 'Class' header");
q = strstr(p + 2, "::");
if ((q == NULL) || (q == p))
return send_error("protocol error: malformatted value for 'Class' header");
if (!strcmp(lifespan, "until-removal"))
filter.lifespan = LIFESPAN_UNTIL_REMOVAL;
else if (!strcmp(lifespan, "until-death"))
filter.lifespan = LIFESPAN_UNTIL_DEATH;
else if (!strcmp(lifespan, "remove"))
filter.lifespan = LIFESPAN_REMOVE;
else
return send_error("protocol error: recognised value for 'Lifespan' header");
if (filter.lifespan == LIFESPAN_REMOVE)
{
if (msg->payload_size)
fprintf(stderr, "%s: ignoring superfluous payload on Command: set-gamma message with "
"Lifespan: remove\n", argv0);
if (priority != NULL)
fprintf(stderr, "%s: ignoring superfluous Priority header on Command: set-gamma message with "
"Lifespan: remove\n", argv0);
}
else if (msg->payload_size != output->ramps_size)
return send_error("invalid payload: size of message payload does matched the expectancy");
else if (priority == NULL)
return send_error("protocol error: 'Priority' header omitted");
filter.class = memdup(class, strlen(class) + 1);
if (filter.class == NULL)
goto fail;
if (filter.lifespan != LIFESPAN_REMOVE)
{
filter.ramps = memdup(msg->payload, msg->payload_size);
if (filter.ramps == NULL)
goto fail;
}
if ((r = add_filter(output, &filter)) < 0)
goto fail;
filter.class = NULL;
filter.ramps = NULL;
if (flush_filters(output, (size_t)r))
goto fail;
return send_errno(0);
fail:
saved_errno = errno;
send_errno(saved_errno);
free(filter.class);
free(filter.ramps);
errno = saved_errno;
return -1;
}
/**
* Recalculate the resulting gamma and
* update push the new gamma ramps to the CRTC
*
* @param output The output
* @param first_updated The index of the first added or removed filter
* @return Zero on success, -1 on error
*/
int flush_filters(struct output* restrict output, size_t first_updated)
{
union gamma_ramps plain;
union gamma_ramps* last;
size_t i;
if (first_updated == 0)
{
if (make_plain_ramps(&plain, output) < 0)
return -1;
last = &plain;
}
else
last = output->table_sums + (first_updated - 1);
for (i = first_updated; i < output->table_size; i++)
{
apply_filter(output->table_sums + i, output->table_filters[i].ramps, output->depth, last);
last = output->table_sums + i;
}
set_gamma(output, last);
if (first_updated == 0)
libgamma_gamma_ramps8_destroy(&(plain.u8));
return 0;
}
