Annotation of embedaddon/tmux/compat/imsg.c, revision 1.1
1.1 ! misho 1: /* $OpenBSD: imsg.c,v 1.15 2017/04/11 09:57:19 reyk 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/types.h>
! 20: #include <sys/socket.h>
! 21: #include <sys/uio.h>
! 22:
! 23: #include <errno.h>
! 24: #include <stdlib.h>
! 25: #include <string.h>
! 26: #include <unistd.h>
! 27:
! 28: #include "compat.h"
! 29: #include "imsg.h"
! 30:
! 31: int imsg_fd_overhead = 0;
! 32:
! 33: int imsg_get_fd(struct imsgbuf *);
! 34:
! 35: void
! 36: imsg_init(struct imsgbuf *ibuf, int fd)
! 37: {
! 38: msgbuf_init(&ibuf->w);
! 39: memset(&ibuf->r, 0, sizeof(ibuf->r));
! 40: ibuf->fd = fd;
! 41: ibuf->w.fd = fd;
! 42: ibuf->pid = getpid();
! 43: TAILQ_INIT(&ibuf->fds);
! 44: }
! 45:
! 46: ssize_t
! 47: imsg_read(struct imsgbuf *ibuf)
! 48: {
! 49: struct msghdr msg;
! 50: struct cmsghdr *cmsg;
! 51: union {
! 52: struct cmsghdr hdr;
! 53: char buf[CMSG_SPACE(sizeof(int) * 1)];
! 54: } cmsgbuf;
! 55: struct iovec iov;
! 56: ssize_t n = -1;
! 57: int fd;
! 58: struct imsg_fd *ifd;
! 59:
! 60: memset(&msg, 0, sizeof(msg));
! 61: memset(&cmsgbuf, 0, sizeof(cmsgbuf));
! 62:
! 63: iov.iov_base = ibuf->r.buf + ibuf->r.wpos;
! 64: iov.iov_len = sizeof(ibuf->r.buf) - ibuf->r.wpos;
! 65: msg.msg_iov = &iov;
! 66: msg.msg_iovlen = 1;
! 67: msg.msg_control = &cmsgbuf.buf;
! 68: msg.msg_controllen = sizeof(cmsgbuf.buf);
! 69:
! 70: if ((ifd = calloc(1, sizeof(struct imsg_fd))) == NULL)
! 71: return (-1);
! 72:
! 73: again:
! 74: if (getdtablecount() + imsg_fd_overhead +
! 75: (int)((CMSG_SPACE(sizeof(int))-CMSG_SPACE(0))/sizeof(int))
! 76: >= getdtablesize()) {
! 77: errno = EAGAIN;
! 78: free(ifd);
! 79: return (-1);
! 80: }
! 81:
! 82: if ((n = recvmsg(ibuf->fd, &msg, 0)) == -1) {
! 83: if (errno == EINTR)
! 84: goto again;
! 85: goto fail;
! 86: }
! 87:
! 88: ibuf->r.wpos += n;
! 89:
! 90: for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
! 91: cmsg = CMSG_NXTHDR(&msg, cmsg)) {
! 92: if (cmsg->cmsg_level == SOL_SOCKET &&
! 93: cmsg->cmsg_type == SCM_RIGHTS) {
! 94: int i;
! 95: int j;
! 96:
! 97: /*
! 98: * We only accept one file descriptor. Due to C
! 99: * padding rules, our control buffer might contain
! 100: * more than one fd, and we must close them.
! 101: */
! 102: j = ((char *)cmsg + cmsg->cmsg_len -
! 103: (char *)CMSG_DATA(cmsg)) / sizeof(int);
! 104: for (i = 0; i < j; i++) {
! 105: fd = ((int *)CMSG_DATA(cmsg))[i];
! 106: if (ifd != NULL) {
! 107: ifd->fd = fd;
! 108: TAILQ_INSERT_TAIL(&ibuf->fds, ifd,
! 109: entry);
! 110: ifd = NULL;
! 111: } else
! 112: close(fd);
! 113: }
! 114: }
! 115: /* we do not handle other ctl data level */
! 116: }
! 117:
! 118: fail:
! 119: free(ifd);
! 120: return (n);
! 121: }
! 122:
! 123: ssize_t
! 124: imsg_get(struct imsgbuf *ibuf, struct imsg *imsg)
! 125: {
! 126: size_t av, left, datalen;
! 127:
! 128: av = ibuf->r.wpos;
! 129:
! 130: if (IMSG_HEADER_SIZE > av)
! 131: return (0);
! 132:
! 133: memcpy(&imsg->hdr, ibuf->r.buf, sizeof(imsg->hdr));
! 134: if (imsg->hdr.len < IMSG_HEADER_SIZE ||
! 135: imsg->hdr.len > MAX_IMSGSIZE) {
! 136: errno = ERANGE;
! 137: return (-1);
! 138: }
! 139: if (imsg->hdr.len > av)
! 140: return (0);
! 141: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
! 142: ibuf->r.rptr = ibuf->r.buf + IMSG_HEADER_SIZE;
! 143: if (datalen == 0)
! 144: imsg->data = NULL;
! 145: else if ((imsg->data = malloc(datalen)) == NULL)
! 146: return (-1);
! 147:
! 148: if (imsg->hdr.flags & IMSGF_HASFD)
! 149: imsg->fd = imsg_get_fd(ibuf);
! 150: else
! 151: imsg->fd = -1;
! 152:
! 153: memcpy(imsg->data, ibuf->r.rptr, datalen);
! 154:
! 155: if (imsg->hdr.len < av) {
! 156: left = av - imsg->hdr.len;
! 157: memmove(&ibuf->r.buf, ibuf->r.buf + imsg->hdr.len, left);
! 158: ibuf->r.wpos = left;
! 159: } else
! 160: ibuf->r.wpos = 0;
! 161:
! 162: return (datalen + IMSG_HEADER_SIZE);
! 163: }
! 164:
! 165: int
! 166: imsg_compose(struct imsgbuf *ibuf, uint32_t type, uint32_t peerid, pid_t pid,
! 167: int fd, const void *data, uint16_t datalen)
! 168: {
! 169: struct ibuf *wbuf;
! 170:
! 171: if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL)
! 172: return (-1);
! 173:
! 174: if (imsg_add(wbuf, data, datalen) == -1)
! 175: return (-1);
! 176:
! 177: wbuf->fd = fd;
! 178:
! 179: imsg_close(ibuf, wbuf);
! 180:
! 181: return (1);
! 182: }
! 183:
! 184: int
! 185: imsg_composev(struct imsgbuf *ibuf, uint32_t type, uint32_t peerid, pid_t pid,
! 186: int fd, const struct iovec *iov, int iovcnt)
! 187: {
! 188: struct ibuf *wbuf;
! 189: int i, datalen = 0;
! 190:
! 191: for (i = 0; i < iovcnt; i++)
! 192: datalen += iov[i].iov_len;
! 193:
! 194: if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL)
! 195: return (-1);
! 196:
! 197: for (i = 0; i < iovcnt; i++)
! 198: if (imsg_add(wbuf, iov[i].iov_base, iov[i].iov_len) == -1)
! 199: return (-1);
! 200:
! 201: wbuf->fd = fd;
! 202:
! 203: imsg_close(ibuf, wbuf);
! 204:
! 205: return (1);
! 206: }
! 207:
! 208: /* ARGSUSED */
! 209: struct ibuf *
! 210: imsg_create(struct imsgbuf *ibuf, uint32_t type, uint32_t peerid, pid_t pid,
! 211: uint16_t datalen)
! 212: {
! 213: struct ibuf *wbuf;
! 214: struct imsg_hdr hdr;
! 215:
! 216: datalen += IMSG_HEADER_SIZE;
! 217: if (datalen > MAX_IMSGSIZE) {
! 218: errno = ERANGE;
! 219: return (NULL);
! 220: }
! 221:
! 222: hdr.type = type;
! 223: hdr.flags = 0;
! 224: hdr.peerid = peerid;
! 225: if ((hdr.pid = pid) == 0)
! 226: hdr.pid = ibuf->pid;
! 227: if ((wbuf = ibuf_dynamic(datalen, MAX_IMSGSIZE)) == NULL) {
! 228: return (NULL);
! 229: }
! 230: if (imsg_add(wbuf, &hdr, sizeof(hdr)) == -1)
! 231: return (NULL);
! 232:
! 233: return (wbuf);
! 234: }
! 235:
! 236: int
! 237: imsg_add(struct ibuf *msg, const void *data, uint16_t datalen)
! 238: {
! 239: if (datalen)
! 240: if (ibuf_add(msg, data, datalen) == -1) {
! 241: ibuf_free(msg);
! 242: return (-1);
! 243: }
! 244: return (datalen);
! 245: }
! 246:
! 247: void
! 248: imsg_close(struct imsgbuf *ibuf, struct ibuf *msg)
! 249: {
! 250: struct imsg_hdr *hdr;
! 251:
! 252: hdr = (struct imsg_hdr *)msg->buf;
! 253:
! 254: hdr->flags &= ~IMSGF_HASFD;
! 255: if (msg->fd != -1)
! 256: hdr->flags |= IMSGF_HASFD;
! 257:
! 258: hdr->len = (uint16_t)msg->wpos;
! 259:
! 260: ibuf_close(&ibuf->w, msg);
! 261: }
! 262:
! 263: void
! 264: imsg_free(struct imsg *imsg)
! 265: {
! 266: freezero(imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE);
! 267: }
! 268:
! 269: int
! 270: imsg_get_fd(struct imsgbuf *ibuf)
! 271: {
! 272: int fd;
! 273: struct imsg_fd *ifd;
! 274:
! 275: if ((ifd = TAILQ_FIRST(&ibuf->fds)) == NULL)
! 276: return (-1);
! 277:
! 278: fd = ifd->fd;
! 279: TAILQ_REMOVE(&ibuf->fds, ifd, entry);
! 280: free(ifd);
! 281:
! 282: return (fd);
! 283: }
! 284:
! 285: int
! 286: imsg_flush(struct imsgbuf *ibuf)
! 287: {
! 288: while (ibuf->w.queued)
! 289: if (msgbuf_write(&ibuf->w) <= 0)
! 290: return (-1);
! 291: return (0);
! 292: }
! 293:
! 294: void
! 295: imsg_clear(struct imsgbuf *ibuf)
! 296: {
! 297: int fd;
! 298:
! 299: msgbuf_clear(&ibuf->w);
! 300: while ((fd = imsg_get_fd(ibuf)) != -1)
! 301: close(fd);
! 302: }
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