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boinc/lib/gui_rpc_client.cpp

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// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2022 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
// This file is the underlying mechanism of GUI RPC client
// (not the actual RPCs)
#ifdef _WIN32
#include "boinc_win.h"
#include "../version.h"
#else
#include "config.h"
#ifdef __EMX__
#include <sys/time.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <cstdio>
#include <unistd.h>
#include <cstdlib>
#include <cstring>
#include <cstddef>
#endif
#include "diagnostics.h"
#include "parse.h"
#include "str_util.h"
#include "util.h"
#include "error_numbers.h"
#include "miofile.h"
#include "md5_file.h"
#include "network.h"
#include "common_defs.h"
#include "gui_rpc_client.h"
using std::string;
using std::vector;
RPC_CLIENT::RPC_CLIENT() {
sock = -1;
start_time = 0;
timeout = 0;
retry = 0;
memset(&addr, 0, sizeof(addr));
}
RPC_CLIENT::~RPC_CLIENT() {
close();
}
#ifdef _WIN32
static int addr_len(sockaddr_storage&) {
return (int) sizeof(sockaddr_in);
}
#else
static int addr_len(sockaddr_storage& s) {
if (s.ss_family == AF_INET6) {
return (int) sizeof(sockaddr_in6);
}
return (int) sizeof(sockaddr_in);
}
#endif
// if any RPC returns ERR_READ or ERR_WRITE,
// call this and then call init() again.
//
void RPC_CLIENT::close() {
//fprintf(stderr, "RPC_CLIENT::close called\n");
if (sock>=0) {
boinc_close_socket(sock);
sock = -1;
}
}
int RPC_CLIENT::get_ip_addr(const char* host, int port) {
memset(&addr, 0, sizeof(addr));
//printf("trying port %d\n", htons(addr.sin_port));
int retval;
if (host) {
retval = resolve_hostname_or_ip_addr(host, addr);
if (retval) {
return ERR_GETHOSTBYNAME;
}
} else {
sockaddr_in* sin = (sockaddr_in*)&addr;
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
}
if (port) {
port = htons(port);
} else {
port = htons(GUI_RPC_PORT);
}
#ifdef _WIN32
addr.sin_port = port;
#else
if (addr.ss_family == AF_INET) {
sockaddr_in* sin = (sockaddr_in*)&addr;
sin->sin_port = port;
} else {
sockaddr_in6* sin = (sockaddr_in6*)&addr;
sin->sin6_port = port;
}
#endif
return 0;
}
int RPC_CLIENT::init(const char* host, int port) {
int retval = get_ip_addr(host, port);
if (retval) return retval;
boinc_socket(sock, AF_INET);
// set up receive timeout; avoid hang if client doesn't respond
//
#ifdef _WIN32
DWORD dwTime = 30000;
if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&dwTime, sizeof dwTime)) {
// not fatal
}
#else
struct timeval tv;
tv.tv_sec = 30;
tv.tv_usec = 0;
if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, sizeof tv)) {
// not fatal
}
#endif
retval = connect(sock, (const sockaddr*)(&addr), addr_len(addr));
if (retval) {
#ifdef _WIN32
BOINCTRACE("RPC_CLIENT::init connect 2: Winsock error '%d'\n", WSAGetLastError());
#endif
BOINCTRACE("RPC_CLIENT::init connect on %d returned %d\n", sock, retval);
//perror("connect");
close();
return ERR_CONNECT;
}
return 0;
}
int RPC_CLIENT::init_asynch(
const char* host, double _timeout, bool _retry, int port
) {
int retval;
retry = _retry;
timeout = _timeout;
retval = get_ip_addr(host, port);
if (retval) return retval;
retval = boinc_socket(sock, AF_INET);
BOINCTRACE("init_asynch() boinc_socket: %d\n", sock);
if (retval) return retval;
retval = boinc_socket_asynch(sock, true);
if (retval) {
BOINCTRACE("init_asynch() boinc_socket_asynch: %d\n", retval);
}
start_time = dtime();
retval = connect(sock, (const sockaddr*)(&addr), addr_len(addr));
if (retval) {
//perror("init_asynch(): connect");
BOINCTRACE("init_asynch() connect: %d\n", retval);
}
return 0;
}
int RPC_CLIENT::init_poll() {
fd_set read_fds, write_fds, error_fds;
struct timeval tv;
int retval;
FD_ZERO(&read_fds);
FD_ZERO(&write_fds);
FD_ZERO(&error_fds);
FD_SET(sock, &read_fds);
FD_SET(sock, &write_fds);
FD_SET(sock, &error_fds);
BOINCTRACE("init_poll(): sock = %d\n", sock);
tv.tv_sec = tv.tv_usec = 0;
if (-1 == select(FD_SETSIZE, &read_fds, &write_fds, &error_fds, &tv)) {
BOINCTRACE("init_poll(): select(): %s (%d)\n", strerror(errno), errno);
return ERR_SELECT;
}
retval = 0;
if (FD_ISSET(sock, &error_fds)) {
retval = ERR_CONNECT;
} else if (FD_ISSET(sock, &write_fds)) {
retval = get_socket_error(sock);
if (!retval) {
BOINCTRACE("init_poll(): connected\n");
retval = boinc_socket_asynch(sock, false);
if (retval) {
BOINCTRACE("init_poll(): boinc_socket_asynch: %d\n", retval);
return retval;
}
return 0;
} else {
BOINCTRACE("init_poll(): get_socket_error(): %d\n", retval);
}
}
if (dtime() > start_time + timeout) {
BOINCTRACE("asynch init timed out\n");
return ERR_CONNECT;
}
if (retval) {
if (retry) {
boinc_close_socket(sock);
retval = boinc_socket(sock, AF_INET);
retval = boinc_socket_asynch(sock, true);
retval = connect(sock, (const sockaddr*)(&addr), addr_len(addr));
BOINCTRACE("init_poll(): retrying connect: %d\n", retval);
return ERR_RETRY;
} else {
return ERR_CONNECT;
}
}
return ERR_RETRY;
}
int RPC_CLIENT::init_unix_domain() {
#if defined(_WIN32)
fprintf(stderr, "Unix domain not implemented in Windows\n");
return -1;
#else
struct sockaddr_un addr_un;
int retval = boinc_socket(sock, AF_UNIX);
if (retval) return retval;
addr_un.sun_family = AF_UNIX;
#ifdef __APPLE__
addr_un.sun_len = sizeof(addr_un);
#endif
strcpy(addr_un.sun_path, GUI_RPC_FILE);
socklen_t len = offsetof(sockaddr_un, sun_path) + strlen(GUI_RPC_FILE);
if (connect(sock, (struct sockaddr*)&addr_un, len) < 0) {
boinc_close_socket(sock);
return ERR_CONNECT;
}
return 0;
#endif
}
int RPC_CLIENT::authorize(const char* passwd) {
bool found=false, authorized;
int retval, n;
char nonce[256], nonce_hash[256], buf[1024];
RPC rpc(this);
XML_PARSER xp(&rpc.fin);
retval = rpc.do_rpc("<auth1/>\n");
if (retval) return retval;
while (!xp.get_tag()) {
if (!xp.is_tag) continue;
if (xp.parse_str("nonce", nonce, sizeof(nonce))) {
found = true;
break;
}
}
free(rpc.mbuf);
rpc.mbuf = 0;
if (!found) {
//fprintf(stderr, "Nonce not found\n");
return ERR_AUTHENTICATOR;
}
n = snprintf(buf, sizeof(buf), "%s%s", nonce, passwd);
if (n >= (int)sizeof(buf)) {
return ERR_AUTHENTICATOR;
}
md5_block((const unsigned char*)buf, (int)strlen(buf), nonce_hash);
snprintf(buf, sizeof(buf), "<auth2>\n<nonce_hash>%s</nonce_hash>\n</auth2>\n", nonce_hash);
retval = rpc.do_rpc(buf);
if (retval) return retval;
while (!xp.get_tag()) {
if (!xp.is_tag) continue;
if (xp.parse_bool("authorized", authorized)) {
if (authorized) return 0;
break;
}
}
return ERR_AUTHENTICATOR;
}
int RPC_CLIENT::send_request(const char* p) {
string buf;
buf = "<boinc_gui_rpc_request>\n";
buf += p;
buf += "</boinc_gui_rpc_request>\n\003";
int n = send(sock, buf.c_str(), (int)buf.size(), 0);
if (n < 0) {
//printf("send: %d\n", n);
//perror("send");
return ERR_WRITE;
}
return 0;
}
// get reply from server. Caller must free buf
//
int RPC_CLIENT::get_reply(char*& mbuf) {
char buf[8193];
MFILE mf;
int n;
mf.puts(""); // make sure buffer is non-NULL
while (1) {
n = recv(sock, buf, 8192, 0);
if (n <= 0) return ERR_READ;
buf[n]=0;
mf.puts(buf);
if (strchr(buf, '\003')) break;
}
mf.get_buf(mbuf, n);
return 0;
}
RPC::RPC(RPC_CLIENT* rc) : xp(&fin) {
mbuf = 0;
rpc_client = rc;
}
RPC::~RPC() {
if (mbuf) free(mbuf);
}
// return value indicates only whether network comm succeeded
// (not whether the op succeeded)
//
int RPC::do_rpc(const char* req) {
int retval;
//fprintf(stderr, "RPC::do_rpc rpc_client->sock = '%d'", rpc_client->sock);
if (rpc_client->sock == -1) return ERR_CONNECT;
#ifdef DEBUG
puts(req);
#endif
retval = rpc_client->send_request(req);
if (retval) return retval;
retval = rpc_client->get_reply(mbuf);
if (retval) return retval;
fin.init_buf_read(mbuf);
#ifdef DEBUG
puts(mbuf);
#endif
return 0;
}
// parse an RPC reply, of the form
//
// <success/>
// or
// <error>error message</error>
// or
// <status>N</status>
//
int RPC::parse_reply() {
char buf[256], error_msg[256];
int n;
while (fin.fgets(buf, 256)) {
if (strstr(buf, "boinc_gui_rpc_reply>")) {
continue;
}
if (strstr(buf, "<success")) return 0;
if (parse_int(buf, "<status>", n)) {
return n;
}
if (strstr(buf, "<unauthorized/>")) return ERR_AUTHENTICATOR;
if (parse_str(buf, "<error>", error_msg, sizeof(error_msg))) {
fprintf(stderr, "%s: GUI RPC error: %s\n",
time_to_string(dtime()), error_msg
);
if (strstr(error_msg, "unauthorized")) return ERR_AUTHENTICATOR;
if (strstr(error_msg, "Missing authenticator")) return ERR_AUTHENTICATOR;
if (strstr(error_msg, "Missing URL")) return ERR_INVALID_URL;
if (strstr(error_msg, "Already attached to project")) return ERR_ALREADY_ATTACHED;
return -1;
}
}
return -1;
}
// Look for a GUI RPC password file and read it.
// If fail, return a prescriptive message.
// Win/Mac: look in
// - current dir
// Linux: look in:
// - current dir
// - a directory specified in /etc/boinc-client/config.properties
// - /var/lib/boinc-client
//
// Note: the Manager (on all platforms) has a -datadir cmdline option.
// If present, it chdirs to that directory.
int read_gui_rpc_password(char* buf, string& msg) {
char msg_buf[5120];
FILE* f = fopen(GUI_RPC_PASSWD_FILE, "r");
if (!f) {
#if defined(__linux__)
#define HELP_URL "https://boinc.berkeley.edu/gui_rpc.php"
char path[MAXPATHLEN];
if (errno == EACCES) {
snprintf(msg_buf, sizeof(msg_buf),
"%s exists but can't be read. See %s",
GUI_RPC_PASSWD_FILE, HELP_URL
);
msg = msg_buf;
return ERR_FOPEN;
}
// look for config file
//
FILE* g = fopen(LINUX_CONFIG_FILE, "r");
if (g) {
char buf2[MAXPATHLEN];
char *p = 0;
while (fgets(buf2, MAXPATHLEN, g)) {
strip_whitespace(buf2);
p = strstr(buf2, "data_dir=");
if (p) break;
}
fclose(g);
if (p) {
p += strlen("data_dir=");
snprintf(path, sizeof(path), "%s/%s", p, GUI_RPC_PASSWD_FILE);
f = fopen(path, "r");
if (!f) {
if (errno == EACCES) {
snprintf(msg_buf, sizeof(msg_buf),
"%s exists but can't be read. See %s",
path, HELP_URL
);
} else {
snprintf(msg_buf, sizeof(msg_buf), "%s not found. See %s",
path, HELP_URL
);
}
msg = msg_buf;
return ERR_FOPEN;
}
} else {
snprintf(msg_buf, sizeof(msg_buf),
"No data_dir= found in %s. See %s",
LINUX_CONFIG_FILE, HELP_URL
);
msg = msg_buf;
return ERR_FOPEN;
}
} else {
// no config file; look in default data dir
//
snprintf(path, sizeof(path), "%s/%s", LINUX_DEFAULT_DATA_DIR, GUI_RPC_PASSWD_FILE);
f = fopen(path, "r");
if (!f) {
if (errno == EACCES) {
snprintf(msg_buf, sizeof(msg_buf),
"%s exists but can't be read. See %s",
path, HELP_URL
);
msg = msg_buf;
return ERR_FOPEN;
}
snprintf(msg_buf, sizeof(msg_buf), "%s not found. See %s",
GUI_RPC_PASSWD_FILE, HELP_URL
);
msg = msg_buf;
return ERR_FOPEN;
}
}
#else
// non-Linux
if (errno == EACCES) {
snprintf(msg_buf, sizeof(msg_buf),
"%s exists but can't be read. Make sure your account is in the 'boinc_users' group",
GUI_RPC_PASSWD_FILE
);
} else {
snprintf(msg_buf, sizeof(msg_buf), "%s not found. Try reinstalling BOINC.",
GUI_RPC_PASSWD_FILE
);
}
msg = msg_buf;
return ERR_FOPEN;
#endif
}
buf[0] = 0;
if (fgets(buf, 256, f)) {
strip_whitespace(buf);
}
fclose(f);
return 0;
}
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