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/* $OpenBSD: bgplgd.c,v 1.3 2022/10/17 15:42:19 claudio Exp $ */
/*
* Copyright (c) 2020 Claudio Jeker <claudio@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <err.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "bgplgd.h"
#define NCMDARGS 4
#define OMETRIC_TYPE \
"application/openmetrics-text; version=1.0.0; charset=utf-8"
const struct cmd {
const char *path;
char *args[NCMDARGS];
unsigned int qs_mask;
int barenbr;
const char *content_type;
} cmds[] = {
{ "/interfaces", { "show", "interfaces", NULL }, 0 },
{ "/memory", { "show", "rib", "memory", NULL }, 0 },
{ "/neighbors", { "show", "neighbor", NULL }, QS_MASK_NEIGHBOR, 1 },
{ "/nexthops", { "show", "nexthop", NULL }, 0 },
{ "/rib", { "show", "rib", "detail", NULL }, QS_MASK_RIB },
{ "/rtr", { "show", "rtr", NULL }, 0 },
{ "/sets", { "show", "sets", NULL }, 0 },
{ "/summary", { "show", NULL }, 0 },
{ "/metrics", { "show", "metrics", NULL }, 0, 0, OMETRIC_TYPE },
{ NULL }
};
static int
command_from_path(const char *path, struct lg_ctx *ctx)
{
size_t i;
for (i = 0; cmds[i].path != NULL; i++) {
if (strcmp(cmds[i].path, path) == 0) {
ctx->command = &cmds[i];
ctx->qs_mask = cmds[i].qs_mask;
return 0;
}
}
return 404;
}
/*
* Prepare a request into a context to call bgpctl.
* Parse method, path and querystring. On failure return the correct
* HTTP error code. On success 0 is returned.
*/
int
prep_request(struct lg_ctx *ctx, const char *meth, const char *path,
const char *qs)
{
if (meth == NULL || path == NULL)
return 500;
if (strcmp(meth, "GET") != 0)
return 405;
if (command_from_path(path, ctx) != 0)
return 404;
if (parse_querystring(qs, ctx) != 0)
return 400;
return 0;
}
/*
* Entry point from the FastCGI handler.
* This runs as an own process and must use STDOUT and STDERR.
* The log functions should no longer be used here.
*/
void
bgpctl_call(struct lg_ctx *ctx)
{
char *argv[64];
size_t i, argc = 0;
argv[argc++] = bgpctlpath;
argv[argc++] = "-j";
argv[argc++] = "-s";
argv[argc++] = bgpctlsock;
for (i = 0; ctx->command->args[i] != NULL; i++)
argv[argc++] = ctx->command->args[i];
argc = qs_argv(argv, argc, sizeof(argv) / sizeof(argv[0]), ctx,
ctx->command->barenbr);
argv[argc++] = NULL;
signal(SIGPIPE, SIG_DFL);
/* Write server header first */
if (ctx->command->content_type == NULL)
printf("Content-type: application/json\r\n\r\n");
else
printf("Content-type: %s\r\n\r\n", ctx->command->content_type);
fflush(stdout);
execvp(bgpctlpath, argv);
err(1, "failed to execute %s", bgpctlpath);
}
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