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119 lines
2.8 KiB
119 lines
2.8 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include "ipc.h"
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int ipc_connect(const char* socket_path) {
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int err;
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int sock = socket(AF_UNIX, SOCK_SEQPACKET, 0);
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if (sock < 0) return -1;
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struct sockaddr_un addr = {
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.sun_family = AF_UNIX,
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};
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snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", socket_path);
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err = connect(sock, (struct sockaddr*)&addr, sizeof(addr));
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if (err != 0) {
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close(sock);
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return -1;
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}
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return sock;
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}
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int ipc_bind(const char* socket_path) {
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int err;
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unlink(socket_path);
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int sock = socket(AF_UNIX, SOCK_SEQPACKET, 0);
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struct sockaddr_un addr = {
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.sun_family = AF_UNIX,
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};
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snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", socket_path);
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err = bind(sock, (struct sockaddr *)&addr, sizeof(addr));
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assert(err == 0);
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err = listen(sock, 3);
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assert(err == 0);
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return sock;
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}
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int ipc_sendrecv_with_fds(bool send, int fd, void *buf, size_t buf_size, int* fds, int num_fds,
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int *out_num_fds) {
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int err;
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char control_buf[CMSG_SPACE(sizeof(int) * num_fds)];
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memset(control_buf, 0, CMSG_SPACE(sizeof(int) * num_fds));
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struct iovec iov = {
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.iov_base = buf,
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.iov_len = buf_size,
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};
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struct msghdr msg = {
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.msg_iov = &iov,
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.msg_iovlen = 1,
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};
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if (num_fds > 0) {
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assert(fds);
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msg.msg_control = control_buf;
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msg.msg_controllen = CMSG_SPACE(sizeof(int) * num_fds);
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}
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if (send) {
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if (num_fds) {
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struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
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assert(cmsg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(int) * num_fds);
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memcpy(CMSG_DATA(cmsg), fds, sizeof(int) * num_fds);
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// printf("send clen %d -> %d\n", num_fds, cmsg->cmsg_len);
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}
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return sendmsg(fd, &msg, 0);
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} else {
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int r = recvmsg(fd, &msg, 0);
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if (r < 0) return r;
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int recv_fds = 0;
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if (msg.msg_controllen > 0) {
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struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
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assert(cmsg);
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assert(cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS);
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recv_fds = (cmsg->cmsg_len - CMSG_LEN(0));
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assert(recv_fds > 0 && (recv_fds % sizeof(int)) == 0);
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recv_fds /= sizeof(int);
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// printf("recv clen %d -> %d\n", cmsg->cmsg_len, recv_fds);
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// assert(cmsg->cmsg_len == CMSG_LEN(sizeof(int) * num_fds));
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assert(fds && recv_fds <= num_fds);
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memcpy(fds, CMSG_DATA(cmsg), sizeof(int) * recv_fds);
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}
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if (msg.msg_flags) {
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for (int i=0; i<recv_fds; i++) {
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close(fds[i]);
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}
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return -1;
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}
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if (fds) {
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assert(out_num_fds);
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*out_num_fds = recv_fds;
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}
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return r;
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}
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}
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