commit - /dev/null
commit + 9ae1b92da58a0a52ae079e76ef9446fa8fdba319
blob - /dev/null
blob + e1f0afbdf2f7cfdc9e0036d326f9abc38efbf20e (mode 644)
--- /dev/null
+++ slowcgi.8
+.\" $OpenBSD: slowcgi.8,v 1.17 2022/08/06 17:11:36 op Exp $
+.\"
+.\" Copyright (c) 2013 Florian Obser <florian@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.
+.\"
+.Dd $Mdocdate: August 6 2022 $
+.Dt SLOWCGI 8
+.Os
+.Sh NAME
+.Nm slowcgi
+.Nd a FastCGI to CGI wrapper server
+.Sh SYNOPSIS
+.Nm
+.Op Fl dv
+.Op Fl p Ar path
+.Op Fl s Ar socket
+.Op Fl t Ar timeout
+.Op Fl U Ar user
+.Op Fl u Ar user
+.Sh DESCRIPTION
+.Nm
+is a server which implements the FastCGI Protocol to execute CGI scripts.
+FastCGI was designed to overcome the CGI protocol's scalability
+and resource sharing limitations.
+While CGI scripts need to be forked for every request, FastCGI scripts
+can be kept running and handle many HTTP requests.
+.Pp
+.Nm
+is a simple server that translates FastCGI requests to the CGI protocol.
+It executes the requested CGI script and translates its output back to the
+FastCGI protocol.
+.Pp
+Modern web frameworks and web applications usually come with the
+capability to run as FastCGI servers.
+.Nm
+is not intended for these applications.
+.Pp
+.Nm
+opens a socket at
+.Pa /var/www/run/slowcgi.sock ,
+owned by www:www,
+with permissions 0660.
+It will then
+.Xr chroot 8
+to
+.Pa /var/www
+and drop privileges to user
+.Qq www .
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl d
+Do not daemonize.
+If this option is specified,
+.Nm
+will run in the foreground and log to stderr.
+.It Fl p Ar path
+.Xr chroot 2
+to
+.Ar path .
+A
+.Ar path
+of
+.Pa /
+effectively disables the chroot.
+.It Fl s Ar socket
+Create and bind to alternative local socket at
+.Ar socket .
+.It Fl t Ar timeout
+Terminate the request after
+.Ar timeout
+seconds instead of the default 120 seconds.
+The CGI script is left to run but its standard input, output and error
+will be closed.
+.It Fl U Ar user
+Change the owner of
+.Pa /var/www/run/slowcgi.sock
+to
+.Ar user
+and its primary group instead of the default www:www.
+.It Fl u Ar user
+Drop privileges to
+.Ar user
+instead of default user www and
+.Xr chroot 8
+to
+the home directory of
+.Ar user .
+.It Fl v
+Enable more verbose (debug) logging.
+.El
+.Sh SEE ALSO
+.Xr httpd 8
+.Sh STANDARDS
+.Rs
+.%A Mark R. Brown
+.%D April 1996
+.%T FastCGI Specification
+.Re
+.Pp
+.Rs
+.%A D. Robinson, K. Coar
+.%D October 2004
+.%R RFC 3875
+.%T The Common Gateway Interface (CGI) Version 1.1
+.Re
+.Sh HISTORY
+The
+.Nm
+server first appeared in
+.Ox 5.4 .
+.Sh AUTHORS
+.An Florian Obser Aq Mt florian@openbsd.org
+.Sh BUGS
+.Nm
+only implements the parts of the FastCGI standard needed to execute
+CGI scripts.
+This is intentional.
blob - /dev/null
blob + 9a0f8b5656d10fd09e62691a5ca827d357f1ff7a (mode 644)
--- /dev/null
+++ slowcgi.c
+/* $OpenBSD: slowcgi.c,v 1.64 2022/08/07 07:43:53 op Exp $ */
+/*
+ * Copyright (c) 2013 David Gwynne <dlg@openbsd.org>
+ * Copyright (c) 2013 Florian Obser <florian@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/types.h>
+#include <sys/ioctl.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/un.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#include <err.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <event.h>
+#include <limits.h>
+#include <pwd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+
+#define TIMEOUT_DEFAULT 120
+#define TIMEOUT_MAX (86400 * 365)
+#define SLOWCGI_USER "www"
+
+#define FCGI_CONTENT_SIZE 65535
+#define FCGI_PADDING_SIZE 255
+#define FCGI_RECORD_SIZE \
+ (sizeof(struct fcgi_record_header) + FCGI_CONTENT_SIZE + FCGI_PADDING_SIZE)
+
+#define FCGI_ALIGNMENT 8
+#define FCGI_ALIGN(n) \
+ (((n) + (FCGI_ALIGNMENT - 1)) & ~(FCGI_ALIGNMENT - 1))
+
+#define STDOUT_DONE 1
+#define STDERR_DONE 2
+#define SCRIPT_DONE 4
+
+#define FCGI_BEGIN_REQUEST 1
+#define FCGI_ABORT_REQUEST 2
+#define FCGI_END_REQUEST 3
+#define FCGI_PARAMS 4
+#define FCGI_STDIN 5
+#define FCGI_STDOUT 6
+#define FCGI_STDERR 7
+#define FCGI_DATA 8
+#define FCGI_GET_VALUES 9
+#define FCGI_GET_VALUES_RESULT 10
+#define FCGI_UNKNOWN_TYPE 11
+#define FCGI_MAXTYPE (FCGI_UNKNOWN_TYPE)
+
+#define FCGI_REQUEST_COMPLETE 0
+#define FCGI_CANT_MPX_CONN 1
+#define FCGI_OVERLOADED 2
+#define FCGI_UNKNOWN_ROLE 3
+
+#define FD_RESERVE 5
+#define FD_NEEDED 6
+int cgi_inflight = 0;
+
+struct listener {
+ struct event ev, pause;
+};
+
+struct env_val {
+ SLIST_ENTRY(env_val) entry;
+ char *val;
+};
+SLIST_HEAD(env_head, env_val);
+
+struct fcgi_record_header {
+ uint8_t version;
+ uint8_t type;
+ uint16_t id;
+ uint16_t content_len;
+ uint8_t padding_len;
+ uint8_t reserved;
+}__packed;
+
+struct fcgi_response {
+ TAILQ_ENTRY(fcgi_response) entry;
+ uint8_t data[FCGI_RECORD_SIZE];
+ size_t data_pos;
+ size_t data_len;
+};
+TAILQ_HEAD(fcgi_response_head, fcgi_response);
+
+struct fcgi_stdin {
+ TAILQ_ENTRY(fcgi_stdin) entry;
+ uint8_t data[FCGI_RECORD_SIZE];
+ size_t data_pos;
+ size_t data_len;
+};
+TAILQ_HEAD(fcgi_stdin_head, fcgi_stdin);
+
+struct request {
+ LIST_ENTRY(request) entry;
+ struct event ev;
+ struct event resp_ev;
+ struct event tmo;
+ int fd;
+ uint8_t buf[FCGI_RECORD_SIZE];
+ size_t buf_pos;
+ size_t buf_len;
+ struct fcgi_response_head response_head;
+ struct fcgi_stdin_head stdin_head;
+ uint16_t id;
+ char script_name[PATH_MAX];
+ struct env_head env;
+ int env_count;
+ pid_t script_pid;
+ int script_status;
+ struct event script_ev;
+ struct event script_err_ev;
+ struct event script_stdin_ev;
+ int stdin_fd_closed;
+ int stdout_fd_closed;
+ int stderr_fd_closed;
+ uint8_t script_flags;
+ uint8_t request_started;
+ int inflight_fds_accounted;
+};
+
+LIST_HEAD(requests_head, request);
+
+struct slowcgi_proc {
+ struct requests_head requests;
+ struct event ev_sigchld;
+};
+
+struct fcgi_begin_request_body {
+ uint16_t role;
+ uint8_t flags;
+ uint8_t reserved[5];
+}__packed;
+
+struct fcgi_end_request_body {
+ uint32_t app_status;
+ uint8_t protocol_status;
+ uint8_t reserved[3];
+}__packed;
+
+__dead void usage(void);
+int slowcgi_listen(char *, struct passwd *);
+void slowcgi_paused(int, short, void *);
+int accept_reserve(int, struct sockaddr *, socklen_t *, int, int *);
+void slowcgi_accept(int, short, void *);
+void slowcgi_request(int, short, void *);
+void slowcgi_response(int, short, void *);
+void slowcgi_add_response(struct request *, struct fcgi_response *);
+void slowcgi_timeout(int, short, void *);
+void slowcgi_sig_handler(int, short, void *);
+size_t parse_record(uint8_t * , size_t, struct request *);
+void parse_begin_request(uint8_t *, uint16_t, struct request *,
+ uint16_t);
+void parse_params(uint8_t *, uint16_t, struct request *, uint16_t);
+void parse_stdin(uint8_t *, uint16_t, struct request *, uint16_t);
+void exec_cgi(struct request *);
+void script_in(int, struct event *, struct request *, uint8_t);
+void script_std_in(int, short, void *);
+void script_err_in(int, short, void *);
+void script_out(int, short, void *);
+void create_end_record(struct request *);
+void dump_fcgi_record(const char *,
+ struct fcgi_record_header *);
+void dump_fcgi_record_header(const char *,
+ struct fcgi_record_header *);
+void dump_fcgi_begin_request_body(const char *,
+ struct fcgi_begin_request_body *);
+void dump_fcgi_end_request_body(const char *,
+ struct fcgi_end_request_body *);
+void cleanup_request(struct request *);
+
+struct loggers {
+ __dead void (*err)(int, const char *, ...)
+ __attribute__((__format__ (printf, 2, 3)));
+ __dead void (*errx)(int, const char *, ...)
+ __attribute__((__format__ (printf, 2, 3)));
+ void (*warn)(const char *, ...)
+ __attribute__((__format__ (printf, 1, 2)));
+ void (*warnx)(const char *, ...)
+ __attribute__((__format__ (printf, 1, 2)));
+ void (*info)(const char *, ...)
+ __attribute__((__format__ (printf, 1, 2)));
+ void (*debug)(const char *, ...)
+ __attribute__((__format__ (printf, 1, 2)));
+};
+
+const struct loggers conslogger = {
+ err,
+ errx,
+ warn,
+ warnx,
+ warnx, /* info */
+ warnx /* debug */
+};
+
+__dead void syslog_err(int, const char *, ...)
+ __attribute__((__format__ (printf, 2, 3)));
+__dead void syslog_errx(int, const char *, ...)
+ __attribute__((__format__ (printf, 2, 3)));
+void syslog_warn(const char *, ...)
+ __attribute__((__format__ (printf, 1, 2)));
+void syslog_warnx(const char *, ...)
+ __attribute__((__format__ (printf, 1, 2)));
+void syslog_info(const char *, ...)
+ __attribute__((__format__ (printf, 1, 2)));
+void syslog_debug(const char *, ...)
+ __attribute__((__format__ (printf, 1, 2)));
+void syslog_vstrerror(int, int, const char *, va_list)
+ __attribute__((__format__ (printf, 3, 0)));
+
+const struct loggers syslogger = {
+ syslog_err,
+ syslog_errx,
+ syslog_warn,
+ syslog_warnx,
+ syslog_info,
+ syslog_debug
+};
+
+const struct loggers *logger = &conslogger;
+
+#define lerr(_e, _f...) logger->err((_e), _f)
+#define lerrx(_e, _f...) logger->errx((_e), _f)
+#define lwarn(_f...) logger->warn(_f)
+#define lwarnx(_f...) logger->warnx(_f)
+#define linfo(_f...) logger->info(_f)
+#define ldebug(_f...) logger->debug(_f)
+
+__dead void
+usage(void)
+{
+ extern char *__progname;
+ fprintf(stderr,
+ "usage: %s [-dv] [-p path] [-s socket] [-t timeout] [-U user] "
+ "[-u user]\n", __progname);
+ exit(1);
+}
+
+struct timeval timeout = { TIMEOUT_DEFAULT, 0 };
+struct slowcgi_proc slowcgi_proc;
+int debug = 0;
+int verbose = 0;
+int on = 1;
+char *fcgi_socket = "/var/www/run/slowcgi.sock";
+
+int
+main(int argc, char *argv[])
+{
+ extern char *__progname;
+ struct listener *l = NULL;
+ struct passwd *pw;
+ struct stat sb;
+ int c, fd;
+ const char *chrootpath = NULL;
+ const char *sock_user = SLOWCGI_USER;
+ const char *slowcgi_user = SLOWCGI_USER;
+ const char *errstr;
+
+ /*
+ * Ensure we have fds 0-2 open so that we have no fd overlaps
+ * in exec_cgi() later. Just exit on error, we don't have enough
+ * fds open to output an error message anywhere.
+ */
+ for (c=0; c < 3; c++) {
+ if (fstat(c, &sb) == -1) {
+ if ((fd = open("/dev/null", O_RDWR)) != -1) {
+ if (dup2(fd, c) == -1)
+ exit(1);
+ if (fd > c)
+ close(fd);
+ } else
+ exit(1);
+ }
+ }
+
+ while ((c = getopt(argc, argv, "dp:s:t:U:u:v")) != -1) {
+ switch (c) {
+ case 'd':
+ debug++;
+ break;
+ case 'p':
+ chrootpath = optarg;
+ break;
+ case 's':
+ fcgi_socket = optarg;
+ break;
+ case 't':
+ timeout.tv_sec = strtonum(optarg, 1, TIMEOUT_MAX,
+ &errstr);
+ if (errstr != NULL)
+ errx(1, "timeout is %s: %s", errstr, optarg);
+ break;
+ case 'U':
+ sock_user = optarg;
+ break;
+ case 'u':
+ slowcgi_user = optarg;
+ break;
+ case 'v':
+ verbose++;
+ break;
+ default:
+ usage();
+ /* NOTREACHED */
+ }
+ }
+
+ if (geteuid() != 0)
+ errx(1, "need root privileges");
+
+ if (!debug && daemon(0, 0) == -1)
+ err(1, "daemon");
+
+ if (!debug) {
+ openlog(__progname, LOG_PID|LOG_NDELAY, LOG_DAEMON);
+ logger = &syslogger;
+ }
+
+ ldebug("sock_user: %s", sock_user);
+ pw = getpwnam(sock_user);
+ if (pw == NULL)
+ lerrx(1, "no %s user", sock_user);
+
+ fd = slowcgi_listen(fcgi_socket, pw);
+
+ ldebug("slowcgi_user: %s", slowcgi_user);
+ pw = getpwnam(slowcgi_user);
+ if (pw == NULL)
+ lerrx(1, "no %s user", slowcgi_user);
+
+ if (chrootpath == NULL)
+ chrootpath = pw->pw_dir;
+
+ if (chroot(chrootpath) == -1)
+ lerr(1, "chroot(%s)", chrootpath);
+
+ ldebug("chroot: %s", chrootpath);
+
+ if (chdir("/") == -1)
+ lerr(1, "chdir(/)");
+
+ if (setgroups(1, &pw->pw_gid) ||
+ setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
+ setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
+ lerr(1, "unable to revoke privs");
+
+ if (pledge("stdio rpath unix proc exec", NULL) == -1)
+ lerr(1, "pledge");
+
+ LIST_INIT(&slowcgi_proc.requests);
+ event_init();
+
+ l = calloc(1, sizeof(*l));
+ if (l == NULL)
+ lerr(1, "listener ev alloc");
+
+ event_set(&l->ev, fd, EV_READ | EV_PERSIST, slowcgi_accept, l);
+ event_add(&l->ev, NULL);
+ evtimer_set(&l->pause, slowcgi_paused, l);
+
+ signal_set(&slowcgi_proc.ev_sigchld, SIGCHLD, slowcgi_sig_handler,
+ &slowcgi_proc);
+ signal(SIGPIPE, SIG_IGN);
+
+ signal_add(&slowcgi_proc.ev_sigchld, NULL);
+
+ event_dispatch();
+ return (0);
+}
+
+int
+slowcgi_listen(char *path, struct passwd *pw)
+{
+ struct sockaddr_un sun;
+ mode_t old_umask;
+ int fd;
+
+ if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC,
+ 0)) == -1)
+ lerr(1, "slowcgi_listen: socket");
+
+ bzero(&sun, sizeof(sun));
+ sun.sun_family = AF_UNIX;
+ if (strlcpy(sun.sun_path, path, sizeof(sun.sun_path)) >=
+ sizeof(sun.sun_path))
+ lerrx(1, "socket path too long");
+
+ if (unlink(path) == -1)
+ if (errno != ENOENT)
+ lerr(1, "slowcgi_listen: unlink %s", path);
+
+ old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
+
+ if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1)
+ lerr(1,"slowcgi_listen: bind: %s", path);
+
+ umask(old_umask);
+
+ if (chown(path, pw->pw_uid, pw->pw_gid) == -1)
+ lerr(1, "slowcgi_listen: chown: %s", path);
+
+ if (listen(fd, 5) == -1)
+ lerr(1, "listen");
+
+ ldebug("socket: %s", path);
+ return fd;
+}
+
+void
+slowcgi_paused(int fd, short events, void *arg)
+{
+ struct listener *l = arg;
+ event_add(&l->ev, NULL);
+}
+
+int
+accept_reserve(int sockfd, struct sockaddr *addr, socklen_t *addrlen,
+ int reserve, int *counter)
+{
+ int ret;
+ if (getdtablecount() + reserve +
+ ((*counter + 1) * FD_NEEDED) >= getdtablesize()) {
+ ldebug("inflight fds exceeded");
+ errno = EMFILE;
+ return -1;
+ }
+
+ if ((ret = accept4(sockfd, addr, addrlen, SOCK_NONBLOCK | SOCK_CLOEXEC))
+ > -1) {
+ (*counter)++;
+ ldebug("inflight incremented, now %d", *counter);
+ }
+ return ret;
+}
+
+void
+slowcgi_accept(int fd, short events, void *arg)
+{
+ struct listener *l;
+ struct sockaddr_storage ss;
+ struct timeval backoff;
+ struct request *c;
+ socklen_t len;
+ int s;
+
+ l = arg;
+ backoff.tv_sec = 1;
+ backoff.tv_usec = 0;
+ c = NULL;
+
+ len = sizeof(ss);
+ if ((s = accept_reserve(fd, (struct sockaddr *)&ss,
+ &len, FD_RESERVE, &cgi_inflight)) == -1) {
+ switch (errno) {
+ case EINTR:
+ case EWOULDBLOCK:
+ case ECONNABORTED:
+ return;
+ case EMFILE:
+ case ENFILE:
+ event_del(&l->ev);
+ evtimer_add(&l->pause, &backoff);
+ return;
+ default:
+ lerr(1, "accept");
+ }
+ }
+
+ c = calloc(1, sizeof(*c));
+ if (c == NULL) {
+ lwarn("cannot calloc request");
+ close(s);
+ cgi_inflight--;
+ return;
+ }
+ c->fd = s;
+ c->buf_pos = 0;
+ c->buf_len = 0;
+ c->request_started = 0;
+ c->stdin_fd_closed = c->stdout_fd_closed = c->stderr_fd_closed = 0;
+ c->inflight_fds_accounted = 0;
+ TAILQ_INIT(&c->response_head);
+ TAILQ_INIT(&c->stdin_head);
+
+ event_set(&c->ev, s, EV_READ | EV_PERSIST, slowcgi_request, c);
+ event_add(&c->ev, NULL);
+ event_set(&c->resp_ev, s, EV_WRITE | EV_PERSIST, slowcgi_response, c);
+ evtimer_set(&c->tmo, slowcgi_timeout, c);
+ evtimer_add(&c->tmo, &timeout);
+ LIST_INSERT_HEAD(&slowcgi_proc.requests, c, entry);
+}
+
+void
+slowcgi_timeout(int fd, short events, void *arg)
+{
+ cleanup_request((struct request*) arg);
+}
+
+void
+slowcgi_sig_handler(int sig, short event, void *arg)
+{
+ struct request *c;
+ struct slowcgi_proc *p;
+ pid_t pid;
+ int status;
+
+ p = arg;
+
+ switch (sig) {
+ case SIGCHLD:
+ while ((pid = waitpid(WAIT_ANY, &status, WNOHANG)) > 0) {
+ LIST_FOREACH(c, &p->requests, entry)
+ if (c->script_pid == pid)
+ break;
+ if (c == NULL) {
+ lwarnx("caught exit of unknown child %i", pid);
+ continue;
+ }
+
+ if (WIFSIGNALED(status))
+ c->script_status = WTERMSIG(status);
+ else
+ c->script_status = WEXITSTATUS(status);
+
+ if (c->script_flags == (STDOUT_DONE | STDERR_DONE))
+ create_end_record(c);
+ c->script_flags |= SCRIPT_DONE;
+
+ ldebug("wait: %s", c->script_name);
+ }
+ if (pid == -1 && errno != ECHILD)
+ lwarn("waitpid");
+ break;
+ default:
+ lerr(1, "unexpected signal: %d", sig);
+ break;
+ }
+}
+
+void
+slowcgi_add_response(struct request *c, struct fcgi_response *resp)
+{
+ struct fcgi_record_header *header;
+ size_t padded_len;
+
+ header = (struct fcgi_record_header*)resp->data;
+
+ /* The FastCGI spec suggests to align the output buffer */
+ padded_len = FCGI_ALIGN(resp->data_len);
+ if (padded_len > resp->data_len) {
+ /* There should always be FCGI_PADDING_SIZE bytes left */
+ if (padded_len > FCGI_RECORD_SIZE)
+ lerr(1, "response too long");
+ header->padding_len = padded_len - resp->data_len;
+ resp->data_len = padded_len;
+ }
+
+ TAILQ_INSERT_TAIL(&c->response_head, resp, entry);
+ event_add(&c->resp_ev, NULL);
+}
+
+void
+slowcgi_response(int fd, short events, void *arg)
+{
+ struct request *c;
+ struct fcgi_record_header *header;
+ struct fcgi_response *resp;
+ ssize_t n;
+
+ c = arg;
+
+ while ((resp = TAILQ_FIRST(&c->response_head))) {
+ header = (struct fcgi_record_header*) resp->data;
+ if (debug > 1)
+ dump_fcgi_record("resp ", header);
+
+ n = write(fd, resp->data + resp->data_pos, resp->data_len);
+ if (n == -1) {
+ if (errno == EAGAIN || errno == EINTR)
+ return;
+ cleanup_request(c);
+ return;
+ }
+ resp->data_pos += n;
+ resp->data_len -= n;
+ if (resp->data_len == 0) {
+ TAILQ_REMOVE(&c->response_head, resp, entry);
+ free(resp);
+ }
+ }
+
+ if (TAILQ_EMPTY(&c->response_head)) {
+ if (c->script_flags == (STDOUT_DONE | STDERR_DONE |
+ SCRIPT_DONE))
+ cleanup_request(c);
+ else
+ event_del(&c->resp_ev);
+ }
+}
+
+void
+slowcgi_request(int fd, short events, void *arg)
+{
+ struct request *c;
+ ssize_t n;
+ size_t parsed;
+
+ c = arg;
+
+ n = read(fd, c->buf + c->buf_pos + c->buf_len,
+ FCGI_RECORD_SIZE - c->buf_pos-c->buf_len);
+
+ switch (n) {
+ case -1:
+ switch (errno) {
+ case EINTR:
+ case EAGAIN:
+ return;
+ default:
+ goto fail;
+ }
+ break;
+
+ case 0:
+ ldebug("closed connection");
+ goto fail;
+ default:
+ break;
+ }
+
+ c->buf_len += n;
+
+ /*
+ * Parse the records as they are received. Per the FastCGI
+ * specification, the server need only receive the FastCGI
+ * parameter records in full; it is free to begin execution
+ * at that point, which is what happens here.
+ */
+ do {
+ parsed = parse_record(c->buf + c->buf_pos, c->buf_len, c);
+ c->buf_pos += parsed;
+ c->buf_len -= parsed;
+ } while (parsed > 0 && c->buf_len > 0);
+
+ /* Make space for further reads */
+ if (c->buf_len > 0) {
+ bcopy(c->buf + c->buf_pos, c->buf, c->buf_len);
+ c->buf_pos = 0;
+ }
+ return;
+fail:
+ cleanup_request(c);
+}
+
+void
+parse_begin_request(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
+{
+ /* XXX -- FCGI_CANT_MPX_CONN */
+ if (c->request_started) {
+ lwarnx("unexpected FCGI_BEGIN_REQUEST, ignoring");
+ return;
+ }
+
+ if (n != sizeof(struct fcgi_begin_request_body)) {
+ lwarnx("wrong size %d != %lu", n,
+ sizeof(struct fcgi_begin_request_body));
+ return;
+ }
+
+ c->request_started = 1;
+
+ c->id = id;
+ SLIST_INIT(&c->env);
+ c->env_count = 0;
+}
+
+void
+parse_params(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
+{
+ struct env_val *env_entry;
+ uint32_t name_len, val_len;
+
+ if (!c->request_started) {
+ lwarnx("FCGI_PARAMS without FCGI_BEGIN_REQUEST, ignoring");
+ return;
+ }
+
+ if (c->id != id) {
+ lwarnx("unexpected id, ignoring");
+ return;
+ }
+
+ /*
+ * If this is the last FastCGI parameter record,
+ * begin execution of the CGI script.
+ */
+ if (n == 0) {
+ exec_cgi(c);
+ return;
+ }
+
+ while (n > 0) {
+ if (buf[0] >> 7 == 0) {
+ name_len = buf[0];
+ n--;
+ buf++;
+ } else {
+ if (n > 3) {
+ name_len = ((buf[0] & 0x7f) << 24) +
+ (buf[1] << 16) + (buf[2] << 8) + buf[3];
+ n -= 4;
+ buf += 4;
+ } else
+ return;
+ }
+
+ if (n > 0) {
+ if (buf[0] >> 7 == 0) {
+ val_len = buf[0];
+ n--;
+ buf++;
+ } else {
+ if (n > 3) {
+ val_len = ((buf[0] & 0x7f) << 24) +
+ (buf[1] << 16) + (buf[2] << 8) +
+ buf[3];
+ n -= 4;
+ buf += 4;
+ } else
+ return;
+ }
+ } else
+ return;
+
+ if (n < name_len + val_len)
+ return;
+
+ if ((env_entry = malloc(sizeof(struct env_val))) == NULL) {
+ lwarnx("cannot allocate env_entry");
+ return;
+ }
+
+ if ((env_entry->val = calloc(sizeof(char), name_len + val_len +
+ 2)) == NULL) {
+ lwarnx("cannot allocate env_entry->val");
+ free(env_entry);
+ return;
+ }
+
+ bcopy(buf, env_entry->val, name_len);
+ buf += name_len;
+ n -= name_len;
+
+ env_entry->val[name_len] = '\0';
+ if (val_len < PATH_MAX && strcmp(env_entry->val,
+ "SCRIPT_NAME") == 0 && c->script_name[0] == '\0') {
+ bcopy(buf, c->script_name, val_len);
+ c->script_name[val_len] = '\0';
+ } else if (val_len < PATH_MAX && strcmp(env_entry->val,
+ "SCRIPT_FILENAME") == 0) {
+ bcopy(buf, c->script_name, val_len);
+ c->script_name[val_len] = '\0';
+ }
+ env_entry->val[name_len] = '=';
+
+ bcopy(buf, (env_entry->val) + name_len + 1, val_len);
+ buf += val_len;
+ n -= val_len;
+
+ SLIST_INSERT_HEAD(&c->env, env_entry, entry);
+ ldebug("env[%d], %s", c->env_count, env_entry->val);
+ c->env_count++;
+ }
+}
+
+void
+parse_stdin(uint8_t *buf, uint16_t n, struct request *c, uint16_t id)
+{
+ struct fcgi_stdin *node;
+
+ if (c->id != id) {
+ lwarnx("unexpected id, ignoring");
+ return;
+ }
+
+ if ((node = calloc(1, sizeof(struct fcgi_stdin))) == NULL) {
+ lwarnx("cannot calloc stdin node");
+ return;
+ }
+
+ bcopy(buf, node->data, n);
+ node->data_pos = 0;
+ node->data_len = n;
+
+ TAILQ_INSERT_TAIL(&c->stdin_head, node, entry);
+
+ if (event_initialized(&c->script_stdin_ev))
+ event_add(&c->script_stdin_ev, NULL);
+}
+
+size_t
+parse_record(uint8_t *buf, size_t n, struct request *c)
+{
+ struct fcgi_record_header *h;
+
+ if (n < sizeof(struct fcgi_record_header))
+ return (0);
+
+ h = (struct fcgi_record_header*) buf;
+
+ if (debug > 1)
+ dump_fcgi_record("", h);
+
+ if (n < sizeof(struct fcgi_record_header) + ntohs(h->content_len)
+ + h->padding_len)
+ return (0);
+
+ if (h->version != 1)
+ lerrx(1, "wrong version");
+
+ switch (h->type) {
+ case FCGI_BEGIN_REQUEST:
+ parse_begin_request(buf + sizeof(struct fcgi_record_header),
+ ntohs(h->content_len), c, ntohs(h->id));
+ break;
+ case FCGI_PARAMS:
+ parse_params(buf + sizeof(struct fcgi_record_header),
+ ntohs(h->content_len), c, ntohs(h->id));
+ break;
+ case FCGI_STDIN:
+ parse_stdin(buf + sizeof(struct fcgi_record_header),
+ ntohs(h->content_len), c, ntohs(h->id));
+ break;
+ default:
+ lwarnx("unimplemented type %d", h->type);
+ break;
+ }
+
+ return (sizeof(struct fcgi_record_header) + ntohs(h->content_len)
+ + h->padding_len);
+}
+
+/*
+ * Fork a new CGI process to handle the request, translating
+ * between FastCGI parameter records and CGI's environment variables,
+ * as well as between the CGI process' stdin/stdout and the
+ * corresponding FastCGI records.
+ */
+void
+exec_cgi(struct request *c)
+{
+ struct env_val *env_entry;
+ int s_in[2], s_out[2], s_err[2], i;
+ pid_t pid;
+ char *argv[2];
+ char **env;
+ char *path;
+
+ i = 0;
+
+ if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, s_in) == -1)
+ lerr(1, "socketpair");
+ if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, s_out) == -1)
+ lerr(1, "socketpair");
+ if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, s_err) == -1)
+ lerr(1, "socketpair");
+ cgi_inflight--;
+ c->inflight_fds_accounted = 1;
+ ldebug("fork: %s", c->script_name);
+
+ switch (pid = fork()) {
+ case -1:
+ c->script_status = errno;
+
+ lwarn("fork");
+
+ close(s_in[0]);
+ close(s_out[0]);
+ close(s_err[0]);
+
+ close(s_in[1]);
+ close(s_out[1]);
+ close(s_err[1]);
+
+ c->stdin_fd_closed = c->stdout_fd_closed =
+ c->stderr_fd_closed = 1;
+ c->script_flags = (STDOUT_DONE | STDERR_DONE | SCRIPT_DONE);
+
+ create_end_record(c);
+ return;
+ case 0:
+ /* Child process */
+ if (pledge("stdio rpath exec", NULL) == -1)
+ lerr(1, "pledge");
+ close(s_in[0]);
+ close(s_out[0]);
+ close(s_err[0]);
+
+ if (dup2(s_in[1], STDIN_FILENO) == -1)
+ _exit(1);
+ if (dup2(s_out[1], STDOUT_FILENO) == -1)
+ _exit(1);
+ if (dup2(s_err[1], STDERR_FILENO) == -1)
+ _exit(1);
+
+ close(s_in[1]);
+ close(s_out[1]);
+ close(s_err[1]);
+
+ signal(SIGPIPE, SIG_DFL);
+
+ path = strrchr(c->script_name, '/');
+ if (path != NULL) {
+ if (path != c->script_name) {
+ *path = '\0';
+ if (chdir(c->script_name) == -1)
+ lwarn("cannot chdir to %s",
+ c->script_name);
+ *path = '/';
+ } else
+ if (chdir("/") == -1)
+ lwarn("cannot chdir to /");
+ }
+
+ argv[0] = c->script_name;
+ argv[1] = NULL;
+ if ((env = calloc(c->env_count + 1, sizeof(char*))) == NULL)
+ _exit(1);
+ SLIST_FOREACH(env_entry, &c->env, entry)
+ env[i++] = env_entry->val;
+ env[i++] = NULL;
+ execve(c->script_name, argv, env);
+ lwarn("execve %s", c->script_name);
+ _exit(1);
+
+ }
+
+ /* Parent process*/
+ close(s_in[1]);
+ close(s_out[1]);
+ close(s_err[1]);
+
+ fcntl(s_in[0], F_SETFD, FD_CLOEXEC);
+ fcntl(s_out[0], F_SETFD, FD_CLOEXEC);
+ fcntl(s_err[0], F_SETFD, FD_CLOEXEC);
+
+ if (ioctl(s_in[0], FIONBIO, &on) == -1)
+ lerr(1, "script ioctl(FIONBIO)");
+ if (ioctl(s_out[0], FIONBIO, &on) == -1)
+ lerr(1, "script ioctl(FIONBIO)");
+ if (ioctl(s_err[0], FIONBIO, &on) == -1)
+ lerr(1, "script ioctl(FIONBIO)");
+
+ c->script_pid = pid;
+ event_set(&c->script_stdin_ev, s_in[0], EV_WRITE | EV_PERSIST,
+ script_out, c);
+ event_add(&c->script_stdin_ev, NULL);
+ event_set(&c->script_ev, s_out[0], EV_READ | EV_PERSIST,
+ script_std_in, c);
+ event_add(&c->script_ev, NULL);
+ event_set(&c->script_err_ev, s_err[0], EV_READ | EV_PERSIST,
+ script_err_in, c);
+ event_add(&c->script_err_ev, NULL);
+}
+
+void
+create_end_record(struct request *c)
+{
+ struct fcgi_response *resp;
+ struct fcgi_record_header *header;
+ struct fcgi_end_request_body *end_request;
+
+ if ((resp = calloc(1, sizeof(struct fcgi_response))) == NULL) {
+ lwarnx("cannot malloc fcgi_response");
+ return;
+ }
+ header = (struct fcgi_record_header*) resp->data;
+ header->version = 1;
+ header->type = FCGI_END_REQUEST;
+ header->id = htons(c->id);
+ header->content_len = htons(sizeof(struct
+ fcgi_end_request_body));
+ header->padding_len = 0;
+ header->reserved = 0;
+ end_request = (struct fcgi_end_request_body *) (resp->data +
+ sizeof(struct fcgi_record_header));
+ end_request->app_status = htonl(c->script_status);
+ end_request->protocol_status = FCGI_REQUEST_COMPLETE;
+ end_request->reserved[0] = 0;
+ end_request->reserved[1] = 0;
+ end_request->reserved[2] = 0;
+ resp->data_pos = 0;
+ resp->data_len = sizeof(struct fcgi_end_request_body) +
+ sizeof(struct fcgi_record_header);
+ slowcgi_add_response(c, resp);
+}
+
+void
+script_in(int fd, struct event *ev, struct request *c, uint8_t type)
+{
+ struct fcgi_response *resp;
+ struct fcgi_record_header *header;
+ ssize_t n;
+
+ if ((resp = calloc(1, sizeof(struct fcgi_response))) == NULL) {
+ lwarnx("cannot malloc fcgi_response");
+ return;
+ }
+ header = (struct fcgi_record_header*) resp->data;
+ header->version = 1;
+ header->type = type;
+ header->id = htons(c->id);
+ header->padding_len = 0;
+ header->reserved = 0;
+
+ n = read(fd, resp->data + sizeof(struct fcgi_record_header),
+ FCGI_CONTENT_SIZE);
+
+ if (n == -1) {
+ switch (errno) {
+ case EINTR:
+ case EAGAIN:
+ free(resp);
+ return;
+ default:
+ n = 0; /* fake empty FCGI_STD{OUT,ERR} response */
+ }
+ }
+ header->content_len = htons(n);
+ resp->data_pos = 0;
+ resp->data_len = n + sizeof(struct fcgi_record_header);
+ slowcgi_add_response(c, resp);
+
+ if (n == 0) {
+ if (type == FCGI_STDOUT)
+ c->script_flags |= STDOUT_DONE;
+ else
+ c->script_flags |= STDERR_DONE;
+
+ if (c->script_flags == (STDOUT_DONE | STDERR_DONE |
+ SCRIPT_DONE)) {
+ create_end_record(c);
+ }
+ event_del(ev);
+ close(fd);
+ if (type == FCGI_STDOUT)
+ c->stdout_fd_closed = 1;
+ else
+ c->stderr_fd_closed = 1;
+ }
+}
+
+void
+script_std_in(int fd, short events, void *arg)
+{
+ struct request *c = arg;
+ script_in(fd, &c->script_ev, c, FCGI_STDOUT);
+}
+
+void
+script_err_in(int fd, short events, void *arg)
+{
+ struct request *c = arg;
+ script_in(fd, &c->script_err_ev, c, FCGI_STDERR);
+}
+
+void
+script_out(int fd, short events, void *arg)
+{
+ struct request *c;
+ struct fcgi_stdin *node;
+ ssize_t n;
+
+ c = arg;
+
+ while ((node = TAILQ_FIRST(&c->stdin_head))) {
+ if (node->data_len == 0) { /* end of stdin marker */
+ close(fd);
+ c->stdin_fd_closed = 1;
+ break;
+ }
+ n = write(fd, node->data + node->data_pos, node->data_len);
+ if (n == -1) {
+ if (errno == EAGAIN || errno == EINTR)
+ return;
+ event_del(&c->script_stdin_ev);
+ return;
+ }
+ node->data_pos += n;
+ node->data_len -= n;
+ if (node->data_len == 0) {
+ TAILQ_REMOVE(&c->stdin_head, node, entry);
+ free(node);
+ }
+ }
+ event_del(&c->script_stdin_ev);
+}
+
+void
+cleanup_request(struct request *c)
+{
+ struct fcgi_response *resp;
+ struct fcgi_stdin *stdin_node;
+ struct env_val *env_entry;
+
+ evtimer_del(&c->tmo);
+ if (event_initialized(&c->ev))
+ event_del(&c->ev);
+ if (event_initialized(&c->resp_ev))
+ event_del(&c->resp_ev);
+ if (event_initialized(&c->script_ev)) {
+ if (!c->stdout_fd_closed)
+ close(EVENT_FD(&c->script_ev));
+ event_del(&c->script_ev);
+ }
+ if (event_initialized(&c->script_err_ev)) {
+ if (!c->stderr_fd_closed)
+ close(EVENT_FD(&c->script_err_ev));
+ event_del(&c->script_err_ev);
+ }
+ if (event_initialized(&c->script_stdin_ev)) {
+ if (!c->stdin_fd_closed)
+ close(EVENT_FD(&c->script_stdin_ev));
+ event_del(&c->script_stdin_ev);
+ }
+ close(c->fd);
+ while (!SLIST_EMPTY(&c->env)) {
+ env_entry = SLIST_FIRST(&c->env);
+ SLIST_REMOVE_HEAD(&c->env, entry);
+ free(env_entry->val);
+ free(env_entry);
+ }
+
+ while ((resp = TAILQ_FIRST(&c->response_head))) {
+ TAILQ_REMOVE(&c->response_head, resp, entry);
+ free(resp);
+ }
+ while ((stdin_node = TAILQ_FIRST(&c->stdin_head))) {
+ TAILQ_REMOVE(&c->stdin_head, stdin_node, entry);
+ free(stdin_node);
+ }
+ LIST_REMOVE(c, entry);
+ if (! c->inflight_fds_accounted)
+ cgi_inflight--;
+ free(c);
+}
+
+void
+dump_fcgi_record(const char *p, struct fcgi_record_header *h)
+{
+ dump_fcgi_record_header(p, h);
+
+ if (h->type == FCGI_BEGIN_REQUEST)
+ dump_fcgi_begin_request_body(p,
+ (struct fcgi_begin_request_body *)(h + 1));
+ else if (h->type == FCGI_END_REQUEST)
+ dump_fcgi_end_request_body(p,
+ (struct fcgi_end_request_body *)(h + 1));
+}
+
+void
+dump_fcgi_record_header(const char* p, struct fcgi_record_header *h)
+{
+ ldebug("%sversion: %d", p, h->version);
+ ldebug("%stype: %d", p, h->type);
+ ldebug("%srequestId: %d", p, ntohs(h->id));
+ ldebug("%scontentLength: %d", p, ntohs(h->content_len));
+ ldebug("%spaddingLength: %d", p, h->padding_len);
+ ldebug("%sreserved: %d", p, h->reserved);
+}
+
+void
+dump_fcgi_begin_request_body(const char *p, struct fcgi_begin_request_body *b)
+{
+ ldebug("%srole %d", p, ntohs(b->role));
+ ldebug("%sflags %d", p, b->flags);
+}
+
+void
+dump_fcgi_end_request_body(const char *p, struct fcgi_end_request_body *b)
+{
+ ldebug("%sappStatus: %d", p, ntohl(b->app_status));
+ ldebug("%sprotocolStatus: %d", p, b->protocol_status);
+}
+
+void
+syslog_vstrerror(int e, int priority, const char *fmt, va_list ap)
+{
+ char *s;
+
+ if (vasprintf(&s, fmt, ap) == -1) {
+ syslog(LOG_EMERG, "unable to alloc in syslog_vstrerror");
+ exit(1);
+ }
+ syslog(priority, "%s: %s", s, strerror(e));
+ free(s);
+}
+
+__dead void
+syslog_err(int ecode, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ syslog_vstrerror(errno, LOG_CRIT, fmt, ap);
+ va_end(ap);
+ exit(ecode);
+}
+
+__dead void
+syslog_errx(int ecode, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ vsyslog(LOG_CRIT, fmt, ap);
+ va_end(ap);
+ exit(ecode);
+}
+
+void
+syslog_warn(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ syslog_vstrerror(errno, LOG_ERR, fmt, ap);
+ va_end(ap);
+}
+
+void
+syslog_warnx(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ vsyslog(LOG_ERR, fmt, ap);
+ va_end(ap);
+}
+
+void
+syslog_info(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ vsyslog(LOG_INFO, fmt, ap);
+ va_end(ap);
+}
+
+void
+syslog_debug(const char *fmt, ...)
+{
+ if (verbose > 0) {
+ va_list ap;
+ va_start(ap, fmt);
+ vsyslog(LOG_DEBUG, fmt, ap);
+ va_end(ap);
+ }
+}
