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add support for protecting references against 'got send -f' to gotd ok op@
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  1 3efd8e31 2022-10-23 thomas /*

  2 3efd8e31 2022-10-23 thomas  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>

  3 3efd8e31 2022-10-23 thomas  *

  4 3efd8e31 2022-10-23 thomas  * Permission to use, copy, modify, and distribute this software for any

  5 3efd8e31 2022-10-23 thomas  * purpose with or without fee is hereby granted, provided that the above

  6 3efd8e31 2022-10-23 thomas  * copyright notice and this permission notice appear in all copies.

  7 3efd8e31 2022-10-23 thomas  *

  8 3efd8e31 2022-10-23 thomas  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

  9 3efd8e31 2022-10-23 thomas  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 10 3efd8e31 2022-10-23 thomas  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 11 3efd8e31 2022-10-23 thomas  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 12 3efd8e31 2022-10-23 thomas  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 13 3efd8e31 2022-10-23 thomas  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 14 3efd8e31 2022-10-23 thomas  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 15 3efd8e31 2022-10-23 thomas  */

 16 3efd8e31 2022-10-23 thomas 

 17 3efd8e31 2022-10-23 thomas #include <sys/queue.h>

 18 3efd8e31 2022-10-23 thomas #include <sys/types.h>

 19 3efd8e31 2022-10-23 thomas #include <sys/uio.h>

 20 3efd8e31 2022-10-23 thomas 

 21 3efd8e31 2022-10-23 thomas #include <errno.h>

 22 3efd8e31 2022-10-23 thomas #include <event.h>

 23 3efd8e31 2022-10-23 thomas #include <imsg.h>

 24 3efd8e31 2022-10-23 thomas #include <limits.h>

 25 3efd8e31 2022-10-23 thomas #include <poll.h>

 26 3efd8e31 2022-10-23 thomas #include <stdio.h>

 27 3efd8e31 2022-10-23 thomas #include <string.h>

 28 3efd8e31 2022-10-23 thomas #include <unistd.h>

 29 3efd8e31 2022-10-23 thomas 

 30 3efd8e31 2022-10-23 thomas #include "got_error.h"

 31 6d7eb4f7 2023-04-04 thomas #include "got_path.h"

 32 3efd8e31 2022-10-23 thomas 

 33 3efd8e31 2022-10-23 thomas #include "got_lib_poll.h"

 34 3efd8e31 2022-10-23 thomas 

 35 3efd8e31 2022-10-23 thomas #include "gotd.h"

 36 3efd8e31 2022-10-23 thomas 

 37 3efd8e31 2022-10-23 thomas const struct got_error *

 38 3efd8e31 2022-10-23 thomas gotd_imsg_recv_error(uint32_t *client_id, struct imsg *imsg)

 39 3efd8e31 2022-10-23 thomas {

 40 3efd8e31 2022-10-23 thomas 	struct gotd_imsg_error ierr;

 41 3efd8e31 2022-10-23 thomas 	size_t datalen;

 42 3efd8e31 2022-10-23 thomas 

 43 3efd8e31 2022-10-23 thomas 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;

 44 3efd8e31 2022-10-23 thomas 	if (datalen != sizeof(ierr))

 45 3efd8e31 2022-10-23 thomas 		return got_error(GOT_ERR_PRIVSEP_LEN);

 46 3efd8e31 2022-10-23 thomas 	memcpy(&ierr, imsg->data, sizeof(ierr));

 47 3efd8e31 2022-10-23 thomas 

 48 3efd8e31 2022-10-23 thomas 	if (client_id)

 49 3efd8e31 2022-10-23 thomas 		*client_id = ierr.client_id;

 50 3efd8e31 2022-10-23 thomas 

 51 3efd8e31 2022-10-23 thomas 	if (ierr.code == GOT_ERR_ERRNO)

 52 3efd8e31 2022-10-23 thomas 		errno = ierr.errno_code;

 53 3efd8e31 2022-10-23 thomas 

 54 3efd8e31 2022-10-23 thomas 	return got_error_msg(ierr.code, ierr.msg);

 55 3efd8e31 2022-10-23 thomas }

 56 3efd8e31 2022-10-23 thomas 

 57 3efd8e31 2022-10-23 thomas const struct got_error *

 58 3efd8e31 2022-10-23 thomas gotd_imsg_flush(struct imsgbuf *ibuf)

 59 3efd8e31 2022-10-23 thomas {

 60 eac60ea1 2022-12-04 thomas 	const struct got_error *err = NULL;

 61 3efd8e31 2022-10-23 thomas 

 62 eac60ea1 2022-12-04 thomas 	while (ibuf->w.queued > 0) {

 63 eac60ea1 2022-12-04 thomas 		err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);

 64 eac60ea1 2022-12-04 thomas 		if (err)

 65 eac60ea1 2022-12-04 thomas 			break;

 66 3efd8e31 2022-10-23 thomas 

 67 eac60ea1 2022-12-04 thomas 		if (imsg_flush(ibuf) == -1) {

 68 eac60ea1 2022-12-04 thomas 			if (errno != EAGAIN) {

 69 eac60ea1 2022-12-04 thomas 				imsg_clear(ibuf);

 70 eac60ea1 2022-12-04 thomas 				err = got_error_from_errno("imsg_flush");

 71 eac60ea1 2022-12-04 thomas 				break;

 72 eac60ea1 2022-12-04 thomas 			}

 73 eac60ea1 2022-12-04 thomas 		}

 74 d4628c48 2023-02-03 thomas 	}

 75 3efd8e31 2022-10-23 thomas 

 76 eac60ea1 2022-12-04 thomas 	return err;

 77 3efd8e31 2022-10-23 thomas }

 78 3efd8e31 2022-10-23 thomas 

 79 3efd8e31 2022-10-23 thomas const struct got_error *

 80 3efd8e31 2022-10-23 thomas gotd_imsg_recv(struct imsg *imsg, struct imsgbuf *ibuf, size_t min_datalen)

 81 3efd8e31 2022-10-23 thomas {

 82 3efd8e31 2022-10-23 thomas 	ssize_t n;

 83 3efd8e31 2022-10-23 thomas 

 84 3efd8e31 2022-10-23 thomas 	n = imsg_get(ibuf, imsg);

 85 3efd8e31 2022-10-23 thomas 	if (n == -1)

 86 3efd8e31 2022-10-23 thomas 		return got_error_from_errno("imsg_get");

 87 3efd8e31 2022-10-23 thomas 

 88 3efd8e31 2022-10-23 thomas 	if (n == 0) {

 89 3efd8e31 2022-10-23 thomas 		n = imsg_read(ibuf);

 90 3efd8e31 2022-10-23 thomas 		if (n == -1) {

 91 3efd8e31 2022-10-23 thomas 			if (errno == EAGAIN)

 92 3efd8e31 2022-10-23 thomas 				return got_error(GOT_ERR_PRIVSEP_READ);

 93 3efd8e31 2022-10-23 thomas 			return got_error_from_errno("imsg_read");

 94 3efd8e31 2022-10-23 thomas 		}

 95 3efd8e31 2022-10-23 thomas 		if (n == 0)

 96 3efd8e31 2022-10-23 thomas 			return got_error(GOT_ERR_EOF);

 97 3efd8e31 2022-10-23 thomas 		n = imsg_get(ibuf, imsg);

 98 3efd8e31 2022-10-23 thomas 		if (n == -1)

 99 3efd8e31 2022-10-23 thomas 			return got_error_from_errno("imsg_get");

100 3efd8e31 2022-10-23 thomas 	}

101 3efd8e31 2022-10-23 thomas 

102 3efd8e31 2022-10-23 thomas 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)

103 3efd8e31 2022-10-23 thomas 		return got_error(GOT_ERR_PRIVSEP_LEN);

104 3efd8e31 2022-10-23 thomas 

105 3efd8e31 2022-10-23 thomas 	return NULL;

106 3efd8e31 2022-10-23 thomas }

107 3efd8e31 2022-10-23 thomas 

108 3efd8e31 2022-10-23 thomas const struct got_error *

109 3efd8e31 2022-10-23 thomas gotd_imsg_poll_recv(struct imsg *imsg, struct imsgbuf *ibuf, size_t min_datalen)

110 3efd8e31 2022-10-23 thomas {

111 3efd8e31 2022-10-23 thomas 	const struct got_error *err = NULL;

112 3efd8e31 2022-10-23 thomas 

113 3efd8e31 2022-10-23 thomas 	for (;;) {

114 3efd8e31 2022-10-23 thomas 		err = gotd_imsg_recv(imsg, ibuf, min_datalen);

115 3efd8e31 2022-10-23 thomas 		if (err == NULL || err->code != GOT_ERR_PRIVSEP_READ)

116 3efd8e31 2022-10-23 thomas 			return err;

117 3efd8e31 2022-10-23 thomas 

118 3efd8e31 2022-10-23 thomas 		err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);

119 3efd8e31 2022-10-23 thomas 		if (err)

120 3efd8e31 2022-10-23 thomas 			break;

121 3efd8e31 2022-10-23 thomas 	}

122 3efd8e31 2022-10-23 thomas 

123 3efd8e31 2022-10-23 thomas 	return err;

124 3efd8e31 2022-10-23 thomas }

125 3efd8e31 2022-10-23 thomas 

126 3efd8e31 2022-10-23 thomas int

127 3efd8e31 2022-10-23 thomas gotd_imsg_send_error(struct imsgbuf *ibuf, uint32_t peerid,

128 3efd8e31 2022-10-23 thomas     uint32_t client_id, const struct got_error *err)

129 3efd8e31 2022-10-23 thomas {

130 3efd8e31 2022-10-23 thomas 	const struct got_error *flush_err;

131 3efd8e31 2022-10-23 thomas 	struct gotd_imsg_error ierr;

132 3efd8e31 2022-10-23 thomas 	int ret;

133 3efd8e31 2022-10-23 thomas 

134 3efd8e31 2022-10-23 thomas 	ierr.code = err->code;

135 3efd8e31 2022-10-23 thomas 	if (err->code == GOT_ERR_ERRNO)

136 3efd8e31 2022-10-23 thomas 		ierr.errno_code = errno;

137 3efd8e31 2022-10-23 thomas 	else

138 3efd8e31 2022-10-23 thomas 		ierr.errno_code = 0;

139 3efd8e31 2022-10-23 thomas 	ierr.client_id = client_id;

140 3efd8e31 2022-10-23 thomas 	strlcpy(ierr.msg, err->msg, sizeof(ierr.msg));

141 3efd8e31 2022-10-23 thomas 

142 3efd8e31 2022-10-23 thomas 	ret = imsg_compose(ibuf, GOTD_IMSG_ERROR, peerid, getpid(), -1,

143 3efd8e31 2022-10-23 thomas 	    &ierr, sizeof(ierr));

144 3efd8e31 2022-10-23 thomas 	if (ret == -1)

145 3efd8e31 2022-10-23 thomas 		return -1;

146 3efd8e31 2022-10-23 thomas 

147 3efd8e31 2022-10-23 thomas 	flush_err = gotd_imsg_flush(ibuf);

148 3efd8e31 2022-10-23 thomas 	if (flush_err)

149 3efd8e31 2022-10-23 thomas 		return -1;

150 3efd8e31 2022-10-23 thomas 

151 3efd8e31 2022-10-23 thomas 	return 0;

152 3efd8e31 2022-10-23 thomas }

153 3efd8e31 2022-10-23 thomas 

154 3efd8e31 2022-10-23 thomas int

155 3efd8e31 2022-10-23 thomas gotd_imsg_send_error_event(struct gotd_imsgev *iev, uint32_t peerid,

156 3efd8e31 2022-10-23 thomas     uint32_t client_id, const struct got_error *err)

157 3efd8e31 2022-10-23 thomas {

158 3efd8e31 2022-10-23 thomas 	struct gotd_imsg_error ierr;

159 3efd8e31 2022-10-23 thomas 	int ret;

160 3efd8e31 2022-10-23 thomas 

161 3efd8e31 2022-10-23 thomas 	ierr.code = err->code;

162 3efd8e31 2022-10-23 thomas 	if (err->code == GOT_ERR_ERRNO)

163 3efd8e31 2022-10-23 thomas 		ierr.errno_code = errno;

164 3efd8e31 2022-10-23 thomas 	else

165 3efd8e31 2022-10-23 thomas 		ierr.errno_code = 0;

166 3efd8e31 2022-10-23 thomas 	ierr.client_id = client_id;

167 3efd8e31 2022-10-23 thomas 	strlcpy(ierr.msg, err->msg, sizeof(ierr.msg));

168 3efd8e31 2022-10-23 thomas 

169 3efd8e31 2022-10-23 thomas 	ret = gotd_imsg_compose_event(iev, GOTD_IMSG_ERROR, peerid, -1,

170 3efd8e31 2022-10-23 thomas 	    &ierr, sizeof(ierr));

171 3efd8e31 2022-10-23 thomas 	if (ret == -1)

172 3efd8e31 2022-10-23 thomas 		return -1;

173 3efd8e31 2022-10-23 thomas 

174 3efd8e31 2022-10-23 thomas 	return 0;

175 3efd8e31 2022-10-23 thomas }

176 3efd8e31 2022-10-23 thomas 

177 3efd8e31 2022-10-23 thomas void

178 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(struct gotd_imsgev *iev)

179 3efd8e31 2022-10-23 thomas {

180 3efd8e31 2022-10-23 thomas 	iev->events = EV_READ;

181 3efd8e31 2022-10-23 thomas 	if (iev->ibuf.w.queued)

182 3efd8e31 2022-10-23 thomas 		iev->events |= EV_WRITE;

183 3efd8e31 2022-10-23 thomas 

184 3efd8e31 2022-10-23 thomas 	event_del(&iev->ev);

185 3efd8e31 2022-10-23 thomas 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);

186 3efd8e31 2022-10-23 thomas 	event_add(&iev->ev, NULL);

187 3efd8e31 2022-10-23 thomas }

188 3efd8e31 2022-10-23 thomas 

189 3efd8e31 2022-10-23 thomas int

190 3efd8e31 2022-10-23 thomas gotd_imsg_compose_event(struct gotd_imsgev *iev, uint16_t type, uint32_t peerid,

191 3efd8e31 2022-10-23 thomas     int fd, void *data, uint16_t datalen)

192 3efd8e31 2022-10-23 thomas {

193 3efd8e31 2022-10-23 thomas 	int ret;

194 3efd8e31 2022-10-23 thomas 

195 3efd8e31 2022-10-23 thomas 	ret = imsg_compose(&iev->ibuf, type, peerid, getpid(), fd,

196 3efd8e31 2022-10-23 thomas 	    data, datalen);

197 3efd8e31 2022-10-23 thomas 	if (ret != -1)

198 3efd8e31 2022-10-23 thomas 		gotd_imsg_event_add(iev);

199 3efd8e31 2022-10-23 thomas 

200 3efd8e31 2022-10-23 thomas 	return ret;

201 3efd8e31 2022-10-23 thomas }

202 3efd8e31 2022-10-23 thomas 

203 3efd8e31 2022-10-23 thomas int

204 3efd8e31 2022-10-23 thomas gotd_imsg_forward(struct gotd_imsgev *iev, struct imsg *imsg, int fd)

205 3efd8e31 2022-10-23 thomas {

206 3efd8e31 2022-10-23 thomas 	return gotd_imsg_compose_event(iev, imsg->hdr.type, imsg->hdr.peerid,

207 3efd8e31 2022-10-23 thomas 	    fd, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE);

208 3efd8e31 2022-10-23 thomas }