Annotation of src/usr.bin/tmux/imsg.c, Revision 1.1
1.1 ! nicm 1: /* $OpenBSD: imsg.c,v 1.18 2009/08/08 18:33:40 nicm Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
! 5: *
! 6: * Permission to use, copy, modify, and distribute this software for any
! 7: * purpose with or without fee is hereby granted, provided that the above
! 8: * copyright notice and this permission notice appear in all copies.
! 9: *
! 10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 17: */
! 18:
! 19: #include <sys/param.h>
! 20: #include <sys/queue.h>
! 21: #include <sys/socket.h>
! 22: #include <sys/uio.h>
! 23:
! 24: #include <errno.h>
! 25: #include <stdlib.h>
! 26: #include <string.h>
! 27: #include <unistd.h>
! 28:
! 29: #include "imsg.h"
! 30:
! 31: int imsg_get_fd(struct imsgbuf *);
! 32:
! 33: void
! 34: imsg_init(struct imsgbuf *ibuf, int fd)
! 35: {
! 36: msgbuf_init(&ibuf->w);
! 37: bzero(&ibuf->r, sizeof(ibuf->r));
! 38: ibuf->fd = fd;
! 39: ibuf->w.fd = fd;
! 40: ibuf->pid = getpid();
! 41: TAILQ_INIT(&ibuf->fds);
! 42: }
! 43:
! 44: ssize_t
! 45: imsg_read(struct imsgbuf *ibuf)
! 46: {
! 47: struct msghdr msg;
! 48: struct cmsghdr *cmsg;
! 49: union {
! 50: struct cmsghdr hdr;
! 51: char buf[CMSG_SPACE(sizeof(int) * 16)];
! 52: } cmsgbuf;
! 53: struct iovec iov;
! 54: ssize_t n;
! 55: int fd;
! 56: struct imsg_fd *ifd;
! 57:
! 58: bzero(&msg, sizeof(msg));
! 59:
! 60: iov.iov_base = ibuf->r.buf + ibuf->r.wpos;
! 61: iov.iov_len = sizeof(ibuf->r.buf) - ibuf->r.wpos;
! 62: msg.msg_iov = &iov;
! 63: msg.msg_iovlen = 1;
! 64: msg.msg_control = &cmsgbuf.buf;
! 65: msg.msg_controllen = sizeof(cmsgbuf.buf);
! 66:
! 67: if ((n = recvmsg(ibuf->fd, &msg, 0)) == -1) {
! 68: if (errno != EINTR && errno != EAGAIN) {
! 69: return (-1);
! 70: }
! 71: return (-2);
! 72: }
! 73:
! 74: ibuf->r.wpos += n;
! 75:
! 76: for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
! 77: cmsg = CMSG_NXTHDR(&msg, cmsg)) {
! 78: if (cmsg->cmsg_level == SOL_SOCKET &&
! 79: cmsg->cmsg_type == SCM_RIGHTS) {
! 80: fd = (*(int *)CMSG_DATA(cmsg));
! 81: if ((ifd = calloc(1, sizeof(struct imsg_fd))) == NULL) {
! 82: /* XXX: this return can leak */
! 83: return (-1);
! 84: }
! 85: ifd->fd = fd;
! 86: TAILQ_INSERT_TAIL(&ibuf->fds, ifd, entry);
! 87: }
! 88: /* we do not handle other ctl data level */
! 89: }
! 90:
! 91: return (n);
! 92: }
! 93:
! 94: ssize_t
! 95: imsg_get(struct imsgbuf *ibuf, struct imsg *imsg)
! 96: {
! 97: size_t av, left, datalen;
! 98:
! 99: av = ibuf->r.wpos;
! 100:
! 101: if (IMSG_HEADER_SIZE > av)
! 102: return (0);
! 103:
! 104: memcpy(&imsg->hdr, ibuf->r.buf, sizeof(imsg->hdr));
! 105: if (imsg->hdr.len < IMSG_HEADER_SIZE ||
! 106: imsg->hdr.len > MAX_IMSGSIZE) {
! 107: errno = ERANGE;
! 108: return (-1);
! 109: }
! 110: if (imsg->hdr.len > av)
! 111: return (0);
! 112: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
! 113: ibuf->r.rptr = ibuf->r.buf + IMSG_HEADER_SIZE;
! 114: if ((imsg->data = malloc(datalen)) == NULL)
! 115: return (-1);
! 116:
! 117: if (imsg->hdr.flags & IMSGF_HASFD)
! 118: imsg->fd = imsg_get_fd(ibuf);
! 119: else
! 120: imsg->fd = -1;
! 121:
! 122: memcpy(imsg->data, ibuf->r.rptr, datalen);
! 123:
! 124: if (imsg->hdr.len < av) {
! 125: left = av - imsg->hdr.len;
! 126: memmove(&ibuf->r.buf, ibuf->r.buf + imsg->hdr.len, left);
! 127: ibuf->r.wpos = left;
! 128: } else
! 129: ibuf->r.wpos = 0;
! 130:
! 131: return (datalen + IMSG_HEADER_SIZE);
! 132: }
! 133:
! 134: int
! 135: imsg_compose(struct imsgbuf *ibuf, u_int32_t type, u_int32_t peerid,
! 136: pid_t pid, int fd, void *data, u_int16_t datalen)
! 137: {
! 138: struct buf *wbuf;
! 139:
! 140: if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL)
! 141: return (-1);
! 142:
! 143: if (imsg_add(wbuf, data, datalen) == -1)
! 144: return (-1);
! 145:
! 146: wbuf->fd = fd;
! 147:
! 148: imsg_close(ibuf, wbuf);
! 149:
! 150: return (1);
! 151: }
! 152:
! 153: int
! 154: imsg_composev(struct imsgbuf *ibuf, u_int32_t type, u_int32_t peerid,
! 155: pid_t pid, int fd, const struct iovec *iov, int iovcnt)
! 156: {
! 157: struct buf *wbuf;
! 158: int i, datalen = 0;
! 159:
! 160: for (i = 0; i < iovcnt; i++)
! 161: datalen += iov[i].iov_len;
! 162:
! 163: if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL)
! 164: return (-1);
! 165:
! 166: for (i = 0; i < iovcnt; i++)
! 167: if (imsg_add(wbuf, iov[i].iov_base, iov[i].iov_len) == -1)
! 168: return (-1);
! 169:
! 170: wbuf->fd = fd;
! 171:
! 172: imsg_close(ibuf, wbuf);
! 173:
! 174: return (1);
! 175: }
! 176:
! 177: /* ARGSUSED */
! 178: struct buf *
! 179: imsg_create(struct imsgbuf *ibuf, u_int32_t type, u_int32_t peerid,
! 180: pid_t pid, u_int16_t datalen)
! 181: {
! 182: struct buf *wbuf;
! 183: struct imsg_hdr hdr;
! 184:
! 185: datalen += IMSG_HEADER_SIZE;
! 186: if (datalen > MAX_IMSGSIZE) {
! 187: errno = ERANGE;
! 188: return (NULL);
! 189: }
! 190:
! 191: hdr.type = type;
! 192: hdr.flags = 0;
! 193: hdr.peerid = peerid;
! 194: if ((hdr.pid = pid) == 0)
! 195: hdr.pid = ibuf->pid;
! 196: if ((wbuf = buf_dynamic(datalen, MAX_IMSGSIZE)) == NULL) {
! 197: return (NULL);
! 198: }
! 199: if (imsg_add(wbuf, &hdr, sizeof(hdr)) == -1)
! 200: return (NULL);
! 201:
! 202: return (wbuf);
! 203: }
! 204:
! 205: int
! 206: imsg_add(struct buf *msg, void *data, u_int16_t datalen)
! 207: {
! 208: if (datalen)
! 209: if (buf_add(msg, data, datalen) == -1) {
! 210: buf_free(msg);
! 211: return (-1);
! 212: }
! 213: return (datalen);
! 214: }
! 215:
! 216: void
! 217: imsg_close(struct imsgbuf *ibuf, struct buf *msg)
! 218: {
! 219: struct imsg_hdr *hdr;
! 220:
! 221: hdr = (struct imsg_hdr *)msg->buf;
! 222:
! 223: hdr->flags &= ~IMSGF_HASFD;
! 224: if (msg->fd != -1)
! 225: hdr->flags |= IMSGF_HASFD;
! 226:
! 227: hdr->len = (u_int16_t)msg->wpos;
! 228:
! 229: buf_close(&ibuf->w, msg);
! 230: }
! 231:
! 232: void
! 233: imsg_free(struct imsg *imsg)
! 234: {
! 235: free(imsg->data);
! 236: }
! 237:
! 238: int
! 239: imsg_get_fd(struct imsgbuf *ibuf)
! 240: {
! 241: int fd;
! 242: struct imsg_fd *ifd;
! 243:
! 244: if ((ifd = TAILQ_FIRST(&ibuf->fds)) == NULL)
! 245: return (-1);
! 246:
! 247: fd = ifd->fd;
! 248: TAILQ_REMOVE(&ibuf->fds, ifd, entry);
! 249: free(ifd);
! 250:
! 251: return (fd);
! 252: }
! 253:
! 254: int
! 255: imsg_flush(struct imsgbuf *ibuf)
! 256: {
! 257: while (ibuf->w.queued)
! 258: if (msgbuf_write(&ibuf->w) < 0)
! 259: return (-1);
! 260: return (0);
! 261: }
! 262:
! 263: void
! 264: imsg_clear(struct imsgbuf *ibuf)
! 265: {
! 266: int fd;
! 267:
! 268: msgbuf_clear(&ibuf->w);
! 269: while ((fd = imsg_get_fd(ibuf)) != -1)
! 270: close(fd);
! 271: }
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