diff options
| -rw-r--r-- | slirp/misc.c | 142 |
1 files changed, 71 insertions, 71 deletions
diff --git a/slirp/misc.c b/slirp/misc.c index 4840187750..7362e14339 100644 --- a/slirp/misc.c +++ b/slirp/misc.c @@ -73,85 +73,92 @@ fork_exec(struct socket *so, const char *ex) #else -/* - * XXX This is ugly - * We create and bind a socket, then fork off to another - * process, which connects to this socket, after which we - * exec the wanted program. If something (strange) happens, - * the accept() call could block us forever. - */ +static int +slirp_socketpair_with_oob(int sv[2]) +{ + struct sockaddr_in addr = { + .sin_family = AF_INET, + .sin_port = 0, + .sin_addr.s_addr = INADDR_ANY, + }; + socklen_t addrlen = sizeof(addr); + int ret, s; + + sv[1] = -1; + s = qemu_socket(AF_INET, SOCK_STREAM, 0); + if (s < 0 || bind(s, (struct sockaddr *)&addr, addrlen) < 0 || + listen(s, 1) < 0 || + getsockname(s, (struct sockaddr *)&addr, &addrlen) < 0) { + goto err; + } + + sv[1] = qemu_socket(AF_INET, SOCK_STREAM, 0); + if (sv[1] < 0) { + goto err; + } + /* + * This connect won't block because we've already listen()ed on + * the server end (even though we won't accept() the connection + * until later on). + */ + do { + ret = connect(sv[1], (struct sockaddr *)&addr, addrlen); + } while (ret < 0 && errno == EINTR); + if (ret < 0) { + goto err; + } + + do { + sv[0] = accept(s, (struct sockaddr *)&addr, &addrlen); + } while (sv[0] < 0 && errno == EINTR); + if (sv[0] < 0) { + goto err; + } + + closesocket(s); + return 0; + +err: + error_report("Error: slirp_socketpair(): %s", strerror(errno)); + if (s >= 0) { + closesocket(s); + } + if (sv[1] >= 0) { + closesocket(sv[1]); + } + return -1; +} + int fork_exec(struct socket *so, const char *ex) { - int s, cs; - struct sockaddr_in addr, csaddr; - socklen_t addrlen = sizeof(addr); - socklen_t csaddrlen = sizeof(csaddr); - int opt; char **argv; - int ret; + int opt, c, sp[2]; pid_t pid; DEBUG_CALL("fork_exec"); DEBUG_ARG("so = %p", so); DEBUG_ARG("ex = %p", ex); - addr.sin_family = AF_INET; - addr.sin_port = 0; - addr.sin_addr.s_addr = INADDR_ANY; - - s = qemu_socket(AF_INET, SOCK_STREAM, 0); - if (s < 0 || bind(s, (struct sockaddr *)&addr, addrlen) < 0 || - listen(s, 1) < 0) { - error_report("Error: inet socket: %s", strerror(errno)); - if (s >= 0) { - closesocket(s); - } + if (slirp_socketpair_with_oob(sp) < 0) { return 0; } - if (getsockname(s, (struct sockaddr *)&csaddr, &csaddrlen) < 0) { - closesocket(s); - return 0; - } - cs = qemu_socket(AF_INET, SOCK_STREAM, 0); - if (cs < 0) { - closesocket(s); - return 0; - } - csaddr.sin_addr = loopback_addr; - /* - * This connect won't block because we've already listen()ed on - * the server end (even though we won't accept() the connection - * until later on). - */ - do { - ret = connect(cs, (struct sockaddr *)&csaddr, csaddrlen); - } while (ret < 0 && errno == EINTR); - if (ret < 0) { - closesocket(s); - closesocket(cs); - return 0; - } - pid = fork(); switch(pid) { case -1: error_report("Error: fork failed: %s", strerror(errno)); - closesocket(cs); - close(s); + closesocket(sp[0]); + closesocket(sp[1]); return 0; case 0: - setsid(); - - /* Set the DISPLAY */ - close(s); - dup2(cs, 0); - dup2(cs, 1); - dup2(cs, 2); - for (s = getdtablesize() - 1; s >= 3; s--) - close(s); + setsid(); + dup2(sp[1], 0); + dup2(sp[1], 1); + dup2(sp[1], 2); + for (c = getdtablesize() - 1; c >= 3; c--) + close(c); argv = g_strsplit(ex, " ", -1); execvp(argv[0], (char **)argv); @@ -163,19 +170,12 @@ fork_exec(struct socket *so, const char *ex) exit(1); default: + so->s = sp[0]; + closesocket(sp[1]); qemu_add_child_watch(pid); - closesocket(cs); - /* - * This should never block, because we already connect()ed - * on the child end before we forked. - */ - do { - so->s = accept(s, (struct sockaddr *)&addr, &addrlen); - } while (so->s < 0 && errno == EINTR); - closesocket(s); - socket_set_fast_reuse(so->s); - opt = 1; - qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int)); + socket_set_fast_reuse(so->s); + opt = 1; + qemu_setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int)); qemu_set_nonblock(so->s); return 1; } |