#include "para.h"
#include "error.h"
#include "crypt.h"
+#include "sideband.h"
#include "command.h"
#include "server.cmdline.h"
#include "string.h"
extern struct sender senders[];
int send_afs_status(struct command_context *cc, int parser_friendly);
-const char *status_item_list[] = {STATUS_ITEM_ARRAY};
-
static void dummy(__a_unused int s)
{
}
return msg;
}
-static char *get_status(struct misc_meta_data *nmmd, int parser_friendly)
+static unsigned get_status(struct misc_meta_data *nmmd, int parser_friendly,
+ char **result)
{
char mtime[30] = "";
char *status, *flags; /* vss status info */
free(flags);
free(status);
free(ut);
- return b.buf;
+ *result = b.buf;
+ return b.offset;
}
static int check_sender_args(int argc, char * const * argv, struct sender_command_data *scd)
return 1;
}
+/**
+ * Send a sideband packet through a blocking file descriptor.
+ *
+ * \param scc fd and crypto keys.
+ * \param buf The buffer to send.
+ * \param numbytes The size of \a buf.
+ * \param band The sideband designator of this packet.
+ * \param dont_free If true, never deallocate \a buf.
+ *
+ * The nonblock flag must be disabled for the file descriptor given by \a scc.
+ *
+ * Stream cipher encryption is automatically activated if neccessary via the
+ * sideband transformation, depending on the value of \a band.
+ *
+ * \return Standard.
+ *
+ * \sa \ref send_sb_va().
+ */
+int send_sb(struct stream_cipher_context *scc, void *buf, size_t numbytes,
+ int band, bool dont_free)
+{
+ int ret;
+ struct sb_context *sbc;
+ struct iovec iov[2];
+ struct sb_buffer sbb = SBB_INIT(band, buf, numbytes);
+ sb_transformation trafo = band < SBD_PROCEED? NULL : sc_trafo;
+
+ sbc = sb_new_send(&sbb, dont_free, trafo, scc->send);
+ do {
+ ret = sb_get_send_buffers(sbc, iov);
+ ret = xwritev(scc->fd, iov, ret);
+ if (ret < 0)
+ goto fail;
+ } while (sb_sent(sbc, ret) == false);
+ return 1;
+fail:
+ sb_free(sbc);
+ return ret;
+}
+
+/**
+ * Create a variable sized buffer and send it as a sideband packet.
+ *
+ * \param scc Passed to \ref send_sb.
+ * \param band See \ref send_sb.
+ * \param fmt The format string.
+ *
+ * \return The return value of the underlying call to \ref send_sb.
+ */
+__printf_3_4 int send_sb_va(struct stream_cipher_context *scc, int band,
+ const char *fmt, ...)
+{
+ va_list ap;
+ char *msg;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = xvasprintf(&msg, fmt, ap);
+ va_end(ap);
+ return send_sb(scc, msg, ret, band, false);
+}
+
+int send_strerror(struct command_context *cc, int err)
+{
+ return cc->use_sideband?
+ send_sb_va(&cc->scc, SBD_ERROR_LOG, "%s\n", para_strerror(err))
+ :
+ sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(err));
+}
+
+/**
+ * Send a sideband packet through a blocking file descriptor.
+ *
+ * \param scc fd and crypto keys.
+ * \param expected_band The expected band designator.
+ * \param max_size Passed to \ref sb_new_recv().
+ * \param result Body of the sideband packet is returned here.
+ *
+ * If \a expected_band is not \p SBD_ANY, the band designator of the received
+ * sideband packet is compared to \a expected_band and a mismatch is considered
+ * an error.
+ *
+ * \return Standard.
+ */
+int recv_sb(struct stream_cipher_context *scc,
+ enum sb_designator expected_band,
+ size_t max_size, struct iovec *result)
+{
+ int ret;
+ struct sb_context *sbc;
+ struct iovec iov;
+ struct sb_buffer sbb;
+ sb_transformation trafo;
+
+ trafo = expected_band != SBD_ANY && expected_band < SBD_PROCEED?
+ NULL : sc_trafo;
+ sbc = sb_new_recv(max_size, trafo, scc->recv);
+ for (;;) {
+ sb_get_recv_buffer(sbc, &iov);
+ ret = recv_bin_buffer(scc->fd, iov.iov_base, iov.iov_len);
+ if (ret == 0)
+ ret = -E_EOF;
+ if (ret < 0)
+ goto fail;
+ ret = sb_received(sbc, ret, &sbb);
+ if (ret < 0)
+ goto fail;
+ if (ret > 0)
+ break;
+ }
+ ret = -E_BAD_BAND;
+ if (expected_band != SBD_ANY && sbb.band != expected_band)
+ goto fail;
+ *result = sbb.iov;
+ return 1;
+fail:
+ sb_free(sbc);
+ return ret;
+}
+
int com_sender(struct command_context *cc)
{
- int i, ret;
+ int i, ret = 0;
char *msg = NULL;
struct sender_command_data scd;
if (cc->argc < 2) {
for (i = 0; senders[i].name; i++) {
- char *tmp = make_message("%s%s\n",
- msg? msg : "", senders[i].name);
+ char *tmp;
+ ret = xasprintf(&tmp, "%s%s\n", msg? msg : "",
+ senders[i].name);
free(msg);
msg = tmp;
}
+ if (cc->use_sideband)
+ return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
ret = sc_send_buffer(&cc->scc, msg);
free(msg);
return ret;
if (scd.sender_num < 0)
return ret;
msg = senders[scd.sender_num].help();
+ if (cc->use_sideband)
+ return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT,
+ false);
ret = sc_send_buffer(&cc->scc, msg);
free(msg);
return ret;
int com_si(struct command_context *cc)
{
int i, ret;
- char *ut;
- char *sender_info = NULL;
+ char *msg, *ut, *sender_info = NULL;
if (cc->argc != 1)
return -E_COMMAND_SYNTAX;
free(info);
}
ut = get_server_uptime_str(now);
- ret = sc_send_va_buffer(&cc->scc, "version: " GIT_VERSION "\n"
+ ret = xasprintf(&msg, "version: " GIT_VERSION "\n"
"up: %s\nplayed: %u\n"
"server_pid: %d\n"
"afs_pid: %d\n"
mutex_unlock(mmd_mutex);
free(ut);
free(sender_info);
+ if (cc->use_sideband)
+ return send_sb(&cc->scc, msg, ret, SBD_OUTPUT, false);
+ ret = sc_send_bin_buffer(&cc->scc, msg, ret);
+ free(msg);
return ret;
}
/* version */
int com_version(struct command_context *cc)
{
+ char *msg;
+ size_t len;
+
if (cc->argc != 1)
return -E_COMMAND_SYNTAX;
- return sc_send_buffer(&cc->scc, VERSION_TEXT("server")
- "built: " BUILD_DATE "\n"
- UNAME_RS ", " CC_VERSION "\n"
- );
+ msg = VERSION_TEXT("server") "built: " BUILD_DATE "\n" UNAME_RS
+ ", " CC_VERSION "\n";
+ len = strlen(msg);
+ if (cc->use_sideband)
+ return send_sb(&cc->scc, msg, len, SBD_OUTPUT, true);
+ return sc_send_bin_buffer(&cc->scc, msg, len);
}
#define EMPTY_STATUS_ITEMS \
*
* This is used by vss when currently no audio file is open.
*/
-static char *empty_status_items(int parser_friendly)
+static unsigned empty_status_items(int parser_friendly, char **result)
{
+ static char *esi;
+ static unsigned len;
+
+ if (esi)
+ goto out;
+
if (parser_friendly)
- return make_message(
+ len = xasprintf(&esi,
#define ITEM(x) "0004 %02x:\n"
EMPTY_STATUS_ITEMS
#undef ITEM
EMPTY_STATUS_ITEMS
#undef ITEM
);
- return make_message(
- #define ITEM(x) "%s:\n"
- EMPTY_STATUS_ITEMS
- #undef ITEM
- #define ITEM(x) ,status_item_list[SI_ ## x]
- EMPTY_STATUS_ITEMS
- #undef ITEM
- );
+ else
+ len = xasprintf(&esi,
+ #define ITEM(x) "%s:\n"
+ EMPTY_STATUS_ITEMS
+ #undef ITEM
+ #define ITEM(x) ,status_item_list[SI_ ## x]
+ EMPTY_STATUS_ITEMS
+ #undef ITEM
+ );
+out:
+ *result = esi;
+ return len;
}
#undef EMPTY_STATUS_ITEMS
{
int i, ret;
struct misc_meta_data tmp, *nmmd = &tmp;
- char *s;
+ char *s, *esi = NULL;
int32_t num = 0;
int parser_friendly = 0;
return -E_COMMAND_SYNTAX;
for (;;) {
mmd_dup(nmmd);
- s = get_status(nmmd, parser_friendly);
- ret = sc_send_buffer(&cc->scc, s);
- free(s);
+ ret = get_status(nmmd, parser_friendly, &s);
+ if (cc->use_sideband)
+ ret = send_sb(&cc->scc, s, ret, SBD_OUTPUT, false);
+ else {
+ ret = sc_send_bin_buffer(&cc->scc, s, ret);
+ free(s);
+ }
if (ret < 0)
goto out;
if (nmmd->vss_status_flags & VSS_NEXT) {
- static char *esi;
- if (!esi)
- esi = empty_status_items(parser_friendly);
- ret = sc_send_buffer(&cc->scc, esi);
+ ret = empty_status_items(parser_friendly, &esi);
+ if (cc->use_sideband)
+ ret = send_sb(&cc->scc, esi, ret, SBD_OUTPUT,
+ true);
+ else
+ ret = sc_send_bin_buffer(&cc->scc, esi, ret);
if (ret < 0)
goto out;
} else
if (num > 0 && !--num)
goto out;
sleep(50);
+ ret = -E_SERVER_CRASH;
if (getppid() == 1)
- return -E_SERVER_CRASH;
+ goto out;
}
out:
+ free(esi);
return ret;
}
-static int send_list_of_commands(struct stream_cipher_context *scc, struct server_command *cmd,
+static int send_list_of_commands(struct command_context *cc, struct server_command *cmd,
const char *handler)
{
- int ret, i;
+ int ret;
+ char *msg = NULL;
- for (i = 1; cmd->name; cmd++, i++) {
- char *perms = cmd_perms_itohuman(cmd->perms);
- ret = sc_send_va_buffer(scc, "%s\t%s\t%s\t%s\n", cmd->name,
- handler,
- perms,
- cmd->description);
+ for (; cmd->name; cmd++) {
+ char *tmp, *perms = cmd_perms_itohuman(cmd->perms);
+ tmp = make_message("%s\t%s\t%s\t%s\n", cmd->name, handler,
+ perms, cmd->description);
free(perms);
- if (ret < 0)
- return ret;
+ msg = para_strcat(msg, tmp);
+ free(tmp);
}
- return 1;
+ if (cc->use_sideband)
+ return send_sb(&cc->scc, msg, strlen(msg), SBD_OUTPUT, false);
+ ret = sc_send_buffer(&cc->scc, msg);
+ free(msg);
+ return ret;
}
/* returns string that must be freed by the caller */
int com_help(struct command_context *cc)
{
struct server_command *cmd;
- char *perms, *handler;
+ char *perms, *handler, *buf;
int ret;
if (cc->argc < 2) {
/* no argument given, print list of commands */
- if ((ret = send_list_of_commands(&cc->scc, server_cmds, "server")) < 0)
+ if ((ret = send_list_of_commands(cc, server_cmds, "server")) < 0)
return ret;
- return send_list_of_commands(&cc->scc, afs_cmds, "afs");
+ return send_list_of_commands(cc, afs_cmds, "afs");
}
/* argument given for help */
cmd = get_cmd_ptr(cc->argv[1], &handler);
if (!cmd)
return -E_BAD_CMD;
perms = cmd_perms_itohuman(cmd->perms);
- ret = sc_send_va_buffer(&cc->scc,
- "%s - %s\n\n"
+ ret = xasprintf(&buf, "%s - %s\n\n"
"handler: %s\n"
"permissions: %s\n"
"usage: %s\n\n"
);
free(perms);
free(handler);
+ if (cc->use_sideband)
+ return send_sb(&cc->scc, buf, ret, SBD_OUTPUT, false);
+ ret = sc_send_buffer(&cc->scc, buf);
+ free(buf);
return ret;
}
para_sigaction(SIGHUP, SIG_DFL);
}
+static int parse_auth_request(char *buf, int len, struct user **u,
+ bool *use_sideband)
+{
+ int ret;
+ char *p, *username, **features = NULL;
+ size_t auth_rq_len = strlen(AUTH_REQUEST_MSG);
+
+ *u = NULL;
+ *use_sideband = false;
+ if (len < auth_rq_len + 2)
+ return -E_AUTH_REQUEST;
+ if (strncmp(buf, AUTH_REQUEST_MSG, auth_rq_len) != 0)
+ return -E_AUTH_REQUEST;
+ username = buf + auth_rq_len;
+ p = strchr(username, ' ');
+ if (p) {
+ int i;
+ if (p == username)
+ return -E_AUTH_REQUEST;
+ *p = '\0';
+ p++;
+ create_argv(p, ",", &features);
+ for (i = 0; features[i]; i++) {
+ if (strcmp(features[i], "sideband") == 0)
+ *use_sideband = true;
+ else {
+ ret = -E_BAD_FEATURE;
+ goto out;
+ }
+ }
+ }
+ PARA_DEBUG_LOG("received auth request for user %s (sideband = %s)\n",
+ username, *use_sideband? "true" : "false");
+ *u = lookup_user(username);
+ ret = 1;
+out:
+ free_argv(features);
+ return ret;
+}
+
+#define HANDSHAKE_BUFSIZE 4096
+
+static int parse_sb_command(struct command_context *cc, struct iovec *iov)
+{
+ int ret, i;
+ char *p, *end;
+
+ ret = -E_BAD_CMD;
+ if (iov->iov_base == NULL || iov->iov_len == 0)
+ goto out;
+ p = iov->iov_base;
+ p[iov->iov_len - 1] = '\0'; /* just to be sure */
+ cc->cmd = get_cmd_ptr(p, NULL);
+ if (!cc->cmd)
+ goto out;
+ ret = check_perms(cc->u->perms, cc->cmd);
+ if (ret < 0)
+ goto out;
+ end = iov->iov_base + iov->iov_len;
+ for (i = 0, p = iov->iov_base; p < end; i++)
+ p += strlen(p) + 1;
+ cc->argc = i;
+ cc->argv = para_malloc((cc->argc + 1) * sizeof(char *));
+ for (i = 0, p = iov->iov_base; p < end; i++) {
+ cc->argv[i] = para_strdup(p);
+ p += strlen(p) + 1;
+ }
+ cc->argv[cc->argc] = NULL;
+ ret = cc->argc;
+out:
+ free(iov->iov_base);
+ return ret;
+}
+
/**
* Perform user authentication and execute a command.
*
__noreturn void handle_connect(int fd, const char *peername)
{
int ret;
- char buf[4096];
unsigned char rand_buf[CHALLENGE_SIZE + 2 * SESSION_KEY_LEN];
unsigned char challenge_hash[HASH_SIZE];
- char *p, *command = NULL;
+ char *p, *command = NULL, *buf = para_malloc(HANDSHAKE_BUFSIZE) /* must be on the heap */;
size_t numbytes;
struct command_context cc_struct = {.peer = peername}, *cc = &cc_struct;
goto net_err;
/* send Welcome message */
ret = write_va_buffer(fd, "This is para_server, version "
- PACKAGE_VERSION ".\n" );
+ PACKAGE_VERSION ".\n"
+ "Features: sideband,foo\n"
+ );
if (ret < 0)
goto net_err;
/* recv auth request line */
- ret = recv_buffer(fd, buf, sizeof(buf));
+ ret = recv_buffer(fd, buf, HANDSHAKE_BUFSIZE);
if (ret < 0)
goto net_err;
- if (ret < 10) {
- ret = -E_AUTH_REQUEST;
- goto net_err;
- }
- ret = -E_AUTH_REQUEST;
- if (strncmp(buf, AUTH_REQUEST_MSG, strlen(AUTH_REQUEST_MSG)))
+ ret = parse_auth_request(buf, ret, &cc->u, &cc->use_sideband);
+ if (ret < 0)
goto net_err;
p = buf + strlen(AUTH_REQUEST_MSG);
PARA_DEBUG_LOG("received auth request for user %s\n", p);
}
PARA_DEBUG_LOG("sending %u byte challenge + rc4 keys (%zu bytes)\n",
CHALLENGE_SIZE, numbytes);
- ret = write_all(fd, buf, numbytes);
- if (ret < 0)
- goto net_err;
- /* recv challenge response */
- ret = recv_bin_buffer(fd, buf, HASH_SIZE);
- if (ret < 0)
- goto net_err;
- numbytes = ret;
- PARA_DEBUG_LOG("received %d bytes challenge response\n", ret);
+ if (cc->use_sideband) {
+ struct iovec iov;
+ ret = send_sb(&cc->scc, buf, numbytes, SBD_CHALLENGE, false);
+ buf = NULL;
+ if (ret < 0)
+ goto net_err;
+ ret = recv_sb(&cc->scc, SBD_CHALLENGE_RESPONSE,
+ HANDSHAKE_BUFSIZE, &iov);
+ if (ret < 0)
+ goto net_err;
+ buf = iov.iov_base;
+ numbytes = iov.iov_len;
+ } else {
+ ret = write_all(fd, buf, numbytes);
+ if (ret < 0)
+ goto net_err;
+ /* recv challenge response */
+ ret = recv_bin_buffer(fd, buf, HASH_SIZE);
+ if (ret < 0)
+ goto net_err;
+ numbytes = ret;
+ }
+ PARA_DEBUG_LOG("received %zu bytes challenge response\n", numbytes);
ret = -E_BAD_USER;
if (!cc->u)
goto net_err;
/* init stream cipher keys with the second part of the random buffer */
cc->scc.recv = sc_new(rand_buf + CHALLENGE_SIZE, SESSION_KEY_LEN);
cc->scc.send = sc_new(rand_buf + CHALLENGE_SIZE + SESSION_KEY_LEN, SESSION_KEY_LEN);
- ret = sc_send_buffer(&cc->scc, PROCEED_MSG);
- if (ret < 0)
- goto net_err;
- ret = read_command(&cc->scc, &command);
- if (ret == -E_COMMAND_SYNTAX)
- goto err_out;
+ if (cc->use_sideband)
+ ret = send_sb(&cc->scc, NULL, 0, SBD_PROCEED, false);
+ else
+ ret = sc_send_buffer(&cc->scc, PROCEED_MSG);
if (ret < 0)
goto net_err;
- ret = -E_BAD_CMD;
- cc->cmd = parse_cmd(command);
- if (!cc->cmd)
- goto err_out;
- /* valid command, check permissions */
- ret = check_perms(cc->u->perms, cc->cmd);
- if (ret < 0)
- goto err_out;
- /* valid command and sufficient perms */
- ret = create_argv(command, "\n", &cc->argv);
- if (ret < 0)
- goto err_out;
- cc->argc = ret;
+ if (cc->use_sideband) {
+ struct iovec iov;
+ ret = recv_sb(&cc->scc, SBD_COMMAND, MAX_COMMAND_LEN, &iov);
+ if (ret < 0)
+ goto net_err;
+ ret = parse_sb_command(cc, &iov);
+ if (ret < 0)
+ goto err_out;
+ cc->argc = ret;
+ } else {
+ ret = read_command(&cc->scc, &command);
+ if (ret == -E_COMMAND_SYNTAX)
+ goto err_out;
+ if (ret < 0)
+ goto net_err;
+ ret = -E_BAD_CMD;
+ cc->cmd = parse_cmd(command);
+ if (!cc->cmd)
+ goto err_out;
+ /* valid command, check permissions */
+ ret = check_perms(cc->u->perms, cc->cmd);
+ if (ret < 0)
+ goto err_out;
+ /* valid command and sufficient perms */
+ ret = create_argv(command, "\n", &cc->argv);
+ if (ret < 0)
+ goto err_out;
+ cc->argc = ret;
+ }
PARA_NOTICE_LOG("calling com_%s() for %s@%s\n", cc->cmd->name,
cc->u->name, peername);
ret = cc->cmd->handler(cc);
if (ret >= 0)
goto out;
err_out:
- sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
+ if (send_strerror(cc, -ret) >= 0 && cc->use_sideband)
+ send_sb(&cc->scc, NULL, 0, SBD_EXIT__FAILURE, true);
net_err:
PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
out:
+ free(buf);
free(command);
sc_free(cc->scc.recv);
sc_free(cc->scc.send);
mmd->events++;
mmd->active_connections--;
mutex_unlock(mmd_mutex);
+ if (ret < 0)
+ exit(EXIT_FAILURE);
+ if (!cc->use_sideband)
+ exit(EXIT_SUCCESS);
+ ret = send_sb(&cc->scc, NULL, 0, SBD_EXIT__SUCCESS, true);
+ if (ret < 0)
+ PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
}