/* $OpenBSD: imsg.c,v 1.1 2006/06/01 14:12:20 norby Exp $ */ /* * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <sys/types.h> #include <sys/uio.h> #include <errno.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "dvmrpd.h" #include "log.h" void imsg_init(struct imsgbuf *ibuf, int fd, void (*handler)(int, short, void *)) { msgbuf_init(&ibuf->w); bzero(&ibuf->r, sizeof(ibuf->r)); ibuf->fd = fd; ibuf->w.fd = fd; ibuf->pid = getpid(); ibuf->handler = handler; TAILQ_INIT(&ibuf->fds); } ssize_t imsg_read(struct imsgbuf *ibuf) { ssize_t n; if ((n = recv(ibuf->fd, ibuf->r.buf + ibuf->r.wpos, sizeof(ibuf->r.buf) - ibuf->r.wpos, 0)) == -1) { if (errno != EINTR && errno != EAGAIN) { log_warn("imsg_read: pipe read error"); return (-1); } return (0); } ibuf->r.wpos += n; return (n); } ssize_t imsg_get(struct imsgbuf *ibuf, struct imsg *imsg) { size_t av, left, datalen; av = ibuf->r.wpos; if (IMSG_HEADER_SIZE > av) return (0); memcpy(&imsg->hdr, ibuf->r.buf, sizeof(imsg->hdr)); if (imsg->hdr.len < IMSG_HEADER_SIZE || imsg->hdr.len > MAX_IMSGSIZE) { log_warnx("imsg_get: imsg hdr len %u out of bounds, type=%u", imsg->hdr.len, imsg->hdr.type); return (-1); } if (imsg->hdr.len > av) return (0); datalen = imsg->hdr.len - IMSG_HEADER_SIZE; ibuf->r.rptr = ibuf->r.buf + IMSG_HEADER_SIZE; if ((imsg->data = malloc(datalen)) == NULL) { log_warn("imsg_get"); return (-1); } memcpy(imsg->data, ibuf->r.rptr, datalen); if (imsg->hdr.len < av) { left = av - imsg->hdr.len; memmove(&ibuf->r.buf, ibuf->r.buf + imsg->hdr.len, left); ibuf->r.wpos = left; } else ibuf->r.wpos = 0; return (datalen + IMSG_HEADER_SIZE); } int imsg_compose(struct imsgbuf *ibuf, enum imsg_type type, u_int32_t peerid, pid_t pid, void *data, u_int16_t datalen) { struct buf *wbuf; int n; if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL) return (-1); if (imsg_add(wbuf, data, datalen) == -1) return (-1); if ((n = imsg_close(ibuf, wbuf)) < 0) return (-1); return (n); } /* ARGSUSED */ struct buf * imsg_create(struct imsgbuf *ibuf, enum imsg_type type, u_int32_t peerid, pid_t pid, u_int16_t datalen) { struct buf *wbuf; struct imsg_hdr hdr; if (datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE) { log_warnx("imsg_create: len %u > MAX_IMSGSIZE; " "type %u peerid %lu", datalen + IMSG_HEADER_SIZE, type, peerid); return (NULL); } hdr.len = (u_int16_t)(datalen + IMSG_HEADER_SIZE); hdr.type = type; hdr.peerid = peerid; if ((hdr.pid = pid) == 0) hdr.pid = ibuf->pid; if ((wbuf = buf_open(hdr.len)) == NULL) { log_warn("imsg_create: buf_open"); return (NULL); } if (imsg_add(wbuf, &hdr, sizeof(hdr)) == -1) return (NULL); return (wbuf); } int imsg_add(struct buf *msg, void *data, u_int16_t datalen) { if (datalen) if (buf_add(msg, data, datalen) == -1) { log_warnx("imsg_add: buf_add error"); buf_free(msg); return (-1); } return (datalen); } int imsg_close(struct imsgbuf *ibuf, struct buf *msg) { int n; if ((n = buf_close(&ibuf->w, msg)) < 0) { log_warnx("imsg_close: buf_close error"); buf_free(msg); return (-1); } imsg_event_add(ibuf); return (n); } void imsg_free(struct imsg *imsg) { free(imsg->data); }