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 3efd8e31 2022-10-23 thomas 
 32 3efd8e31 2022-10-23 thomas #include "got_lib_poll.h"
 33 3efd8e31 2022-10-23 thomas 
 34 3efd8e31 2022-10-23 thomas #include "gotd.h"
 35 3efd8e31 2022-10-23 thomas 
 36 3efd8e31 2022-10-23 thomas const struct got_error *
 37 3efd8e31 2022-10-23 thomas gotd_imsg_recv_error(uint32_t *client_id, struct imsg *imsg)
 38 3efd8e31 2022-10-23 thomas {
 39 3efd8e31 2022-10-23 thomas 	struct gotd_imsg_error ierr;
 40 3efd8e31 2022-10-23 thomas 	size_t datalen;
 41 3efd8e31 2022-10-23 thomas 
 42 3efd8e31 2022-10-23 thomas 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 43 3efd8e31 2022-10-23 thomas 	if (datalen != sizeof(ierr))
 44 3efd8e31 2022-10-23 thomas 		return got_error(GOT_ERR_PRIVSEP_LEN);
 45 3efd8e31 2022-10-23 thomas 	memcpy(&ierr, imsg->data, sizeof(ierr));
 46 3efd8e31 2022-10-23 thomas 
 47 3efd8e31 2022-10-23 thomas 	if (client_id)
 48 3efd8e31 2022-10-23 thomas 		*client_id = ierr.client_id;
 49 3efd8e31 2022-10-23 thomas 
 50 3efd8e31 2022-10-23 thomas 	if (ierr.code == GOT_ERR_ERRNO)
 51 3efd8e31 2022-10-23 thomas 		errno = ierr.errno_code;
 52 3efd8e31 2022-10-23 thomas 
 53 3efd8e31 2022-10-23 thomas 	return got_error_msg(ierr.code, ierr.msg);
 54 3efd8e31 2022-10-23 thomas }
 55 3efd8e31 2022-10-23 thomas 
 56 3efd8e31 2022-10-23 thomas const struct got_error *
 57 3efd8e31 2022-10-23 thomas gotd_imsg_flush(struct imsgbuf *ibuf)
 58 3efd8e31 2022-10-23 thomas {
 59 eac60ea1 2022-12-04 thomas 	const struct got_error *err = NULL;
 60 3efd8e31 2022-10-23 thomas 
 61 eac60ea1 2022-12-04 thomas 	while (ibuf->w.queued > 0) {
 62 eac60ea1 2022-12-04 thomas 		err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
 63 eac60ea1 2022-12-04 thomas 		if (err)
 64 eac60ea1 2022-12-04 thomas 			break;
 65 3efd8e31 2022-10-23 thomas 
 66 eac60ea1 2022-12-04 thomas 		if (imsg_flush(ibuf) == -1) {
 67 eac60ea1 2022-12-04 thomas 			if (errno != EAGAIN) {
 68 eac60ea1 2022-12-04 thomas 				imsg_clear(ibuf);
 69 eac60ea1 2022-12-04 thomas 				err = got_error_from_errno("imsg_flush");
 70 eac60ea1 2022-12-04 thomas 				break;
 71 eac60ea1 2022-12-04 thomas 			}
 72 eac60ea1 2022-12-04 thomas 		}
 73 d4628c48 2023-02-03 thomas 	}
 74 3efd8e31 2022-10-23 thomas 
 75 eac60ea1 2022-12-04 thomas 	return err;
 76 3efd8e31 2022-10-23 thomas }
 77 3efd8e31 2022-10-23 thomas 
 78 3efd8e31 2022-10-23 thomas const struct got_error *
 79 3efd8e31 2022-10-23 thomas gotd_imsg_recv(struct imsg *imsg, struct imsgbuf *ibuf, size_t min_datalen)
 80 3efd8e31 2022-10-23 thomas {
 81 3efd8e31 2022-10-23 thomas 	ssize_t n;
 82 3efd8e31 2022-10-23 thomas 
 83 3efd8e31 2022-10-23 thomas 	n = imsg_get(ibuf, imsg);
 84 3efd8e31 2022-10-23 thomas 	if (n == -1)
 85 3efd8e31 2022-10-23 thomas 		return got_error_from_errno("imsg_get");
 86 3efd8e31 2022-10-23 thomas 
 87 3efd8e31 2022-10-23 thomas 	if (n == 0) {
 88 3efd8e31 2022-10-23 thomas 		n = imsg_read(ibuf);
 89 3efd8e31 2022-10-23 thomas 		if (n == -1) {
 90 3efd8e31 2022-10-23 thomas 			if (errno == EAGAIN)
 91 3efd8e31 2022-10-23 thomas 				return got_error(GOT_ERR_PRIVSEP_READ);
 92 3efd8e31 2022-10-23 thomas 			return got_error_from_errno("imsg_read");
 93 3efd8e31 2022-10-23 thomas 		}
 94 3efd8e31 2022-10-23 thomas 		if (n == 0)
 95 3efd8e31 2022-10-23 thomas 			return got_error(GOT_ERR_EOF);
 96 3efd8e31 2022-10-23 thomas 		n = imsg_get(ibuf, imsg);
 97 3efd8e31 2022-10-23 thomas 		if (n == -1)
 98 3efd8e31 2022-10-23 thomas 			return got_error_from_errno("imsg_get");
 99 3efd8e31 2022-10-23 thomas 	}
100 3efd8e31 2022-10-23 thomas 
101 3efd8e31 2022-10-23 thomas 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
102 3efd8e31 2022-10-23 thomas 		return got_error(GOT_ERR_PRIVSEP_LEN);
103 3efd8e31 2022-10-23 thomas 
104 3efd8e31 2022-10-23 thomas 	return NULL;
105 3efd8e31 2022-10-23 thomas }
106 3efd8e31 2022-10-23 thomas 
107 3efd8e31 2022-10-23 thomas const struct got_error *
108 3efd8e31 2022-10-23 thomas gotd_imsg_poll_recv(struct imsg *imsg, struct imsgbuf *ibuf, size_t min_datalen)
109 3efd8e31 2022-10-23 thomas {
110 3efd8e31 2022-10-23 thomas 	const struct got_error *err = NULL;
111 3efd8e31 2022-10-23 thomas 
112 3efd8e31 2022-10-23 thomas 	for (;;) {
113 3efd8e31 2022-10-23 thomas 		err = gotd_imsg_recv(imsg, ibuf, min_datalen);
114 3efd8e31 2022-10-23 thomas 		if (err == NULL || err->code != GOT_ERR_PRIVSEP_READ)
115 3efd8e31 2022-10-23 thomas 			return err;
116 3efd8e31 2022-10-23 thomas 
117 3efd8e31 2022-10-23 thomas 		err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);
118 3efd8e31 2022-10-23 thomas 		if (err)
119 3efd8e31 2022-10-23 thomas 			break;
120 3efd8e31 2022-10-23 thomas 	}
121 3efd8e31 2022-10-23 thomas 
122 3efd8e31 2022-10-23 thomas 	return err;
123 3efd8e31 2022-10-23 thomas }
124 3efd8e31 2022-10-23 thomas 
125 3efd8e31 2022-10-23 thomas int
126 3efd8e31 2022-10-23 thomas gotd_imsg_send_error(struct imsgbuf *ibuf, uint32_t peerid,
127 3efd8e31 2022-10-23 thomas     uint32_t client_id, const struct got_error *err)
128 3efd8e31 2022-10-23 thomas {
129 3efd8e31 2022-10-23 thomas 	const struct got_error *flush_err;
130 3efd8e31 2022-10-23 thomas 	struct gotd_imsg_error ierr;
131 3efd8e31 2022-10-23 thomas 	int ret;
132 3efd8e31 2022-10-23 thomas 
133 3efd8e31 2022-10-23 thomas 	ierr.code = err->code;
134 3efd8e31 2022-10-23 thomas 	if (err->code == GOT_ERR_ERRNO)
135 3efd8e31 2022-10-23 thomas 		ierr.errno_code = errno;
136 3efd8e31 2022-10-23 thomas 	else
137 3efd8e31 2022-10-23 thomas 		ierr.errno_code = 0;
138 3efd8e31 2022-10-23 thomas 	ierr.client_id = client_id;
139 3efd8e31 2022-10-23 thomas 	strlcpy(ierr.msg, err->msg, sizeof(ierr.msg));
140 3efd8e31 2022-10-23 thomas 
141 3efd8e31 2022-10-23 thomas 	ret = imsg_compose(ibuf, GOTD_IMSG_ERROR, peerid, getpid(), -1,
142 3efd8e31 2022-10-23 thomas 	    &ierr, sizeof(ierr));
143 3efd8e31 2022-10-23 thomas 	if (ret == -1)
144 3efd8e31 2022-10-23 thomas 		return -1;
145 3efd8e31 2022-10-23 thomas 
146 3efd8e31 2022-10-23 thomas 	flush_err = gotd_imsg_flush(ibuf);
147 3efd8e31 2022-10-23 thomas 	if (flush_err)
148 3efd8e31 2022-10-23 thomas 		return -1;
149 3efd8e31 2022-10-23 thomas 
150 3efd8e31 2022-10-23 thomas 	return 0;
151 3efd8e31 2022-10-23 thomas }
152 3efd8e31 2022-10-23 thomas 
153 3efd8e31 2022-10-23 thomas int
154 3efd8e31 2022-10-23 thomas gotd_imsg_send_error_event(struct gotd_imsgev *iev, uint32_t peerid,
155 3efd8e31 2022-10-23 thomas     uint32_t client_id, const struct got_error *err)
156 3efd8e31 2022-10-23 thomas {
157 3efd8e31 2022-10-23 thomas 	struct gotd_imsg_error ierr;
158 3efd8e31 2022-10-23 thomas 	int ret;
159 3efd8e31 2022-10-23 thomas 
160 3efd8e31 2022-10-23 thomas 	ierr.code = err->code;
161 3efd8e31 2022-10-23 thomas 	if (err->code == GOT_ERR_ERRNO)
162 3efd8e31 2022-10-23 thomas 		ierr.errno_code = errno;
163 3efd8e31 2022-10-23 thomas 	else
164 3efd8e31 2022-10-23 thomas 		ierr.errno_code = 0;
165 3efd8e31 2022-10-23 thomas 	ierr.client_id = client_id;
166 3efd8e31 2022-10-23 thomas 	strlcpy(ierr.msg, err->msg, sizeof(ierr.msg));
167 3efd8e31 2022-10-23 thomas 
168 3efd8e31 2022-10-23 thomas 	ret = gotd_imsg_compose_event(iev, GOTD_IMSG_ERROR, peerid, -1,
169 3efd8e31 2022-10-23 thomas 	    &ierr, sizeof(ierr));
170 3efd8e31 2022-10-23 thomas 	if (ret == -1)
171 3efd8e31 2022-10-23 thomas 		return -1;
172 3efd8e31 2022-10-23 thomas 
173 3efd8e31 2022-10-23 thomas 	return 0;
174 3efd8e31 2022-10-23 thomas }
175 3efd8e31 2022-10-23 thomas 
176 3efd8e31 2022-10-23 thomas void
177 3efd8e31 2022-10-23 thomas gotd_imsg_event_add(struct gotd_imsgev *iev)
178 3efd8e31 2022-10-23 thomas {
179 3efd8e31 2022-10-23 thomas 	iev->events = EV_READ;
180 3efd8e31 2022-10-23 thomas 	if (iev->ibuf.w.queued)
181 3efd8e31 2022-10-23 thomas 		iev->events |= EV_WRITE;
182 3efd8e31 2022-10-23 thomas 
183 3efd8e31 2022-10-23 thomas 	event_del(&iev->ev);
184 3efd8e31 2022-10-23 thomas 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
185 3efd8e31 2022-10-23 thomas 	event_add(&iev->ev, NULL);
186 3efd8e31 2022-10-23 thomas }
187 3efd8e31 2022-10-23 thomas 
188 3efd8e31 2022-10-23 thomas int
189 3efd8e31 2022-10-23 thomas gotd_imsg_compose_event(struct gotd_imsgev *iev, uint16_t type, uint32_t peerid,
190 3efd8e31 2022-10-23 thomas     int fd, void *data, uint16_t datalen)
191 3efd8e31 2022-10-23 thomas {
192 3efd8e31 2022-10-23 thomas 	int ret;
193 3efd8e31 2022-10-23 thomas 
194 3efd8e31 2022-10-23 thomas 	ret = imsg_compose(&iev->ibuf, type, peerid, getpid(), fd,
195 3efd8e31 2022-10-23 thomas 	    data, datalen);
196 3efd8e31 2022-10-23 thomas 	if (ret != -1)
197 3efd8e31 2022-10-23 thomas 		gotd_imsg_event_add(iev);
198 3efd8e31 2022-10-23 thomas 
199 3efd8e31 2022-10-23 thomas 	return ret;
200 3efd8e31 2022-10-23 thomas }
201 3efd8e31 2022-10-23 thomas 
202 3efd8e31 2022-10-23 thomas int
203 3efd8e31 2022-10-23 thomas gotd_imsg_forward(struct gotd_imsgev *iev, struct imsg *imsg, int fd)
204 3efd8e31 2022-10-23 thomas {
205 3efd8e31 2022-10-23 thomas 	return gotd_imsg_compose_event(iev, imsg->hdr.type, imsg->hdr.peerid,
206 3efd8e31 2022-10-23 thomas 	    fd, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE);
207 3efd8e31 2022-10-23 thomas }