449 lines
10 KiB
C
449 lines
10 KiB
C
#define _GNU_SOURCE
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#include <sys/types.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <time.h>
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#include "server.h"
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#include "connections.h"
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#include "response.h"
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#include "connections.h"
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#include "log.h"
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#include "plugin.h"
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#ifdef HAVE_FORK
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/* no need for waitpid if we don't have fork */
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#include <sys/wait.h>
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#endif
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typedef struct {
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buffer *path_rrdtool_bin;
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buffer *path_rrd;
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double requests, *requests_ptr;
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double bytes_written, *bytes_written_ptr;
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double bytes_read, *bytes_read_ptr;
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} plugin_config;
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typedef struct {
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PLUGIN_DATA;
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buffer *cmd;
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buffer *resp;
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int read_fd, write_fd;
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pid_t rrdtool_pid;
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int rrdtool_running;
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plugin_config **config_storage;
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plugin_config conf;
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} plugin_data;
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INIT_FUNC(mod_rrd_init) {
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plugin_data *p;
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p = calloc(1, sizeof(*p));
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p->resp = buffer_init();
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p->cmd = buffer_init();
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return p;
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}
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FREE_FUNC(mod_rrd_free) {
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plugin_data *p = p_d;
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size_t i;
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if (!p) return HANDLER_GO_ON;
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if (p->config_storage) {
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for (i = 0; i < srv->config_context->used; i++) {
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plugin_config *s = p->config_storage[i];
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buffer_free(s->path_rrdtool_bin);
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buffer_free(s->path_rrd);
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free(s);
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}
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}
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buffer_free(p->cmd);
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buffer_free(p->resp);
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free(p->config_storage);
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if (p->rrdtool_pid) {
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int status;
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close(p->read_fd);
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close(p->write_fd);
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#ifdef HAVE_FORK
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/* collect status */
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waitpid(p->rrdtool_pid, &status, 0);
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#endif
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}
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free(p);
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return HANDLER_GO_ON;
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}
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int mod_rrd_create_pipe(server *srv, plugin_data *p) {
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pid_t pid;
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int to_rrdtool_fds[2];
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int from_rrdtool_fds[2];
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#ifdef HAVE_FORK
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if (pipe(to_rrdtool_fds)) {
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log_error_write(srv, __FILE__, __LINE__, "ss",
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"pipe failed: ", strerror(errno));
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return -1;
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}
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if (pipe(from_rrdtool_fds)) {
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log_error_write(srv, __FILE__, __LINE__, "ss",
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"pipe failed: ", strerror(errno));
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return -1;
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}
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/* fork, execve */
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switch (pid = fork()) {
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case 0: {
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/* child */
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char **args;
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int argc;
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int i = 0;
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char *dash = "-";
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/* move stdout to from_rrdtool_fd[1] */
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close(STDOUT_FILENO);
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dup2(from_rrdtool_fds[1], STDOUT_FILENO);
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close(from_rrdtool_fds[1]);
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/* not needed */
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close(from_rrdtool_fds[0]);
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/* move the stdin to to_rrdtool_fd[0] */
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close(STDIN_FILENO);
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dup2(to_rrdtool_fds[0], STDIN_FILENO);
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close(to_rrdtool_fds[0]);
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/* not needed */
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close(to_rrdtool_fds[1]);
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close(STDERR_FILENO);
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if (srv->errorlog_mode == ERRORLOG_FILE) {
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dup2(srv->errorlog_fd, STDERR_FILENO);
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close(srv->errorlog_fd);
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}
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/* set up args */
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argc = 3;
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args = malloc(sizeof(*args) * argc);
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i = 0;
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args[i++] = p->conf.path_rrdtool_bin->ptr;
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args[i++] = dash;
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args[i++] = NULL;
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/* we don't need the client socket */
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for (i = 3; i < 256; i++) {
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close(i);
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}
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/* exec the cgi */
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execv(args[0], args);
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log_error_write(srv, __FILE__, __LINE__, "sss", "spawing rrdtool failed: ", strerror(errno), args[0]);
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/* */
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SEGFAULT();
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break;
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}
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case -1:
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/* error */
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log_error_write(srv, __FILE__, __LINE__, "ss", "fork failed: ", strerror(errno));
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break;
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default: {
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/* father */
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close(from_rrdtool_fds[1]);
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close(to_rrdtool_fds[0]);
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/* register PID and wait for them asyncronously */
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p->write_fd = to_rrdtool_fds[1];
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p->read_fd = from_rrdtool_fds[0];
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p->rrdtool_pid = pid;
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break;
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}
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}
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return 0;
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#else
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return -1;
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#endif
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}
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static int mod_rrdtool_create_rrd(server *srv, plugin_data *p, plugin_config *s) {
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struct stat st;
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/* check if DB already exists */
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if (0 == stat(s->path_rrd->ptr, &st)) {
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/* check if it is plain file */
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if (!S_ISREG(st.st_mode)) {
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log_error_write(srv, __FILE__, __LINE__, "sb",
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"not a regular file:", s->path_rrd);
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return HANDLER_ERROR;
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}
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} else {
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int r ;
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/* create a new one */
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BUFFER_COPY_STRING_CONST(p->cmd, "create ");
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buffer_append_string_buffer(p->cmd, s->path_rrd);
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buffer_append_string(p->cmd, " --step 60 ");
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buffer_append_string(p->cmd, "DS:InOctets:ABSOLUTE:600:U:U ");
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buffer_append_string(p->cmd, "DS:OutOctets:ABSOLUTE:600:U:U ");
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buffer_append_string(p->cmd, "DS:Requests:ABSOLUTE:600:U:U ");
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buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:1:600 ");
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buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:6:700 ");
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buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:24:775 ");
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buffer_append_string(p->cmd, "RRA:AVERAGE:0.5:288:797 ");
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buffer_append_string(p->cmd, "RRA:MAX:0.5:1:600 ");
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buffer_append_string(p->cmd, "RRA:MAX:0.5:6:700 ");
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buffer_append_string(p->cmd, "RRA:MAX:0.5:24:775 ");
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buffer_append_string(p->cmd, "RRA:MAX:0.5:288:797 ");
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buffer_append_string(p->cmd, "RRA:MIN:0.5:1:600 ");
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buffer_append_string(p->cmd, "RRA:MIN:0.5:6:700 ");
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buffer_append_string(p->cmd, "RRA:MIN:0.5:24:775 ");
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buffer_append_string(p->cmd, "RRA:MIN:0.5:288:797\n");
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if (-1 == (r = write(p->write_fd, p->cmd->ptr, p->cmd->used - 1))) {
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log_error_write(srv, __FILE__, __LINE__, "ss",
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"rrdtool-write: failed", strerror(errno));
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return HANDLER_ERROR;
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}
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buffer_prepare_copy(p->resp, 4096);
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if (-1 == (r = read(p->read_fd, p->resp->ptr, p->resp->size))) {
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log_error_write(srv, __FILE__, __LINE__, "ss",
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"rrdtool-read: failed", strerror(errno));
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return HANDLER_ERROR;
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}
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p->resp->used = r;
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if (p->resp->ptr[0] != 'O' ||
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p->resp->ptr[1] != 'K') {
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log_error_write(srv, __FILE__, __LINE__, "sbb",
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"rrdtool-response:", p->cmd, p->resp);
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return HANDLER_ERROR;
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}
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}
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return HANDLER_GO_ON;
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}
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#define PATCH(x) \
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p->conf.x = s->x;
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static int mod_rrd_patch_connection(server *srv, connection *con, plugin_data *p) {
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size_t i, j;
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plugin_config *s = p->config_storage[0];
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PATCH(path_rrdtool_bin);
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PATCH(path_rrd);
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p->conf.bytes_written_ptr = &(s->bytes_written);
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p->conf.bytes_read_ptr = &(s->bytes_read);
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p->conf.requests_ptr = &(s->requests);
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/* skip the first, the global context */
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for (i = 1; i < srv->config_context->used; i++) {
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data_config *dc = (data_config *)srv->config_context->data[i];
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s = p->config_storage[i];
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/* condition didn't match */
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if (!config_check_cond(srv, con, dc)) continue;
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/* merge config */
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for (j = 0; j < dc->value->used; j++) {
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data_unset *du = dc->value->data[j];
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if (buffer_is_equal_string(du->key, CONST_STR_LEN("rrdtool.db-name"))) {
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PATCH(path_rrd);
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/* get pointers to double values */
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p->conf.bytes_written_ptr = &(s->bytes_written);
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p->conf.bytes_read_ptr = &(s->bytes_read);
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p->conf.requests_ptr = &(s->requests);
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}
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}
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}
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return 0;
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}
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#undef PATCH
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SETDEFAULTS_FUNC(mod_rrd_set_defaults) {
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plugin_data *p = p_d;
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size_t i;
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config_values_t cv[] = {
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{ "rrdtool.binary", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_SERVER },
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{ "rrdtool.db-name", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
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{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
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};
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if (!p) return HANDLER_ERROR;
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p->config_storage = malloc(srv->config_context->used * sizeof(specific_config *));
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for (i = 0; i < srv->config_context->used; i++) {
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plugin_config *s;
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s = malloc(sizeof(plugin_config));
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s->path_rrdtool_bin = buffer_init();
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s->path_rrd = buffer_init();
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s->requests = 0;
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s->bytes_written = 0;
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s->bytes_read = 0;
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cv[0].destination = s->path_rrdtool_bin;
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cv[1].destination = s->path_rrd;
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p->config_storage[i] = s;
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if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {
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return HANDLER_ERROR;
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}
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if (i > 0 && !buffer_is_empty(s->path_rrdtool_bin)) {
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/* path_rrdtool_bin is a global option */
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log_error_write(srv, __FILE__, __LINE__, "s",
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"rrdtool.binary can only be set as a global option.");
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return HANDLER_ERROR;
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}
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}
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p->conf.path_rrdtool_bin = p->config_storage[0]->path_rrdtool_bin;
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p->rrdtool_running = 0;
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/* check for dir */
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if (buffer_is_empty(p->conf.path_rrdtool_bin)) {
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log_error_write(srv, __FILE__, __LINE__, "s",
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"rrdtool.binary has to be set");
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return HANDLER_ERROR;
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}
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/* open the pipe to rrdtool */
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if (mod_rrd_create_pipe(srv, p)) {
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return HANDLER_ERROR;
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}
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p->rrdtool_running = 1;
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return HANDLER_GO_ON;
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}
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TRIGGER_FUNC(mod_rrd_trigger) {
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plugin_data *p = p_d;
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size_t i;
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if (!p->rrdtool_running) return HANDLER_GO_ON;
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if ((srv->cur_ts % 60) != 0) return HANDLER_GO_ON;
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for (i = 0; i < srv->config_context->used; i++) {
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plugin_config *s = p->config_storage[i];
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int r;
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if (buffer_is_empty(s->path_rrd)) continue;
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/* write the data down every minute */
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if (HANDLER_GO_ON != mod_rrdtool_create_rrd(srv, p, s)) return HANDLER_ERROR;
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BUFFER_COPY_STRING_CONST(p->cmd, "update ");
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buffer_append_string_buffer(p->cmd, s->path_rrd);
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BUFFER_APPEND_STRING_CONST(p->cmd, " N:");
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buffer_append_off_t(p->cmd, s->bytes_read);
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BUFFER_APPEND_STRING_CONST(p->cmd, ":");
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buffer_append_off_t(p->cmd, s->bytes_written);
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BUFFER_APPEND_STRING_CONST(p->cmd, ":");
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buffer_append_long(p->cmd, s->requests);
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BUFFER_APPEND_STRING_CONST(p->cmd, "\n");
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if (-1 == (r = write(p->write_fd, p->cmd->ptr, p->cmd->used - 1))) {
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p->rrdtool_running = 0;
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log_error_write(srv, __FILE__, __LINE__, "ss",
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"rrdtool-write: failed", strerror(errno));
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return HANDLER_ERROR;
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}
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buffer_prepare_copy(p->resp, 4096);
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if (-1 == (r = read(p->read_fd, p->resp->ptr, p->resp->size))) {
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p->rrdtool_running = 0;
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log_error_write(srv, __FILE__, __LINE__, "ss",
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"rrdtool-read: failed", strerror(errno));
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return HANDLER_ERROR;
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}
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p->resp->used = r;
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if (p->resp->ptr[0] != 'O' ||
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p->resp->ptr[1] != 'K') {
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p->rrdtool_running = 0;
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log_error_write(srv, __FILE__, __LINE__, "sbb",
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"rrdtool-response:", p->cmd, p->resp);
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return HANDLER_ERROR;
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}
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s->requests = 0;
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s->bytes_written = 0;
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s->bytes_read = 0;
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}
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return HANDLER_GO_ON;
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}
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REQUESTDONE_FUNC(mod_rrd_account) {
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plugin_data *p = p_d;
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mod_rrd_patch_connection(srv, con, p);
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*(p->conf.requests_ptr) += 1;
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*(p->conf.bytes_written_ptr) += con->bytes_written;
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*(p->conf.bytes_read_ptr) += con->bytes_read;
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return HANDLER_GO_ON;
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}
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int mod_rrdtool_plugin_init(plugin *p) {
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p->version = LIGHTTPD_VERSION_ID;
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p->name = buffer_init_string("rrd");
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p->init = mod_rrd_init;
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p->cleanup = mod_rrd_free;
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p->set_defaults= mod_rrd_set_defaults;
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p->handle_trigger = mod_rrd_trigger;
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p->handle_request_done = mod_rrd_account;
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p->data = NULL;
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return 0;
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}
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