diff options
Diffstat (limited to 'pasta.c')
| -rw-r--r-- | pasta.c | 43 |
1 files changed, 28 insertions, 15 deletions
@@ -57,15 +57,13 @@ int pasta_child_pid; /** * pasta_child_handler() - Exit once shell exits (if we started it), reap clones - * @signal: Unused, handler deals with SIGCHLD only + * @signal: Signal number; this handler deals with SIGCHLD only */ void pasta_child_handler(int signal) { int errno_save = errno; siginfo_t infop; - (void)signal; - if (signal != SIGCHLD) return; @@ -169,10 +167,12 @@ void pasta_open_ns(struct ctx *c, const char *netns) * struct pasta_spawn_cmd_arg - Argument for pasta_spawn_cmd() * @exe: Executable to run * @argv: Command and arguments to run + * @ctx: Context to read config from */ struct pasta_spawn_cmd_arg { const char *exe; char *const *argv; + struct ctx *c; }; /** @@ -186,6 +186,7 @@ static int pasta_spawn_cmd(void *arg) { char hostname[HOST_NAME_MAX + 1] = HOSTNAME_PREFIX; const struct pasta_spawn_cmd_arg *a; + size_t conf_hostname_len; sigset_t set; /* We run in a detached PID and mount namespace: mount /proc over */ @@ -195,9 +196,15 @@ static int pasta_spawn_cmd(void *arg) if (write_file("/proc/sys/net/ipv4/ping_group_range", "0 0")) warn("Cannot set ping_group_range, ICMP requests might fail"); - if (!gethostname(hostname + sizeof(HOSTNAME_PREFIX) - 1, - HOST_NAME_MAX + 1 - sizeof(HOSTNAME_PREFIX)) || - errno == ENAMETOOLONG) { + a = (const struct pasta_spawn_cmd_arg *)arg; + + conf_hostname_len = strlen(a->c->hostname); + if (conf_hostname_len > 0) { + if (sethostname(a->c->hostname, conf_hostname_len)) + warn("Unable to set configured hostname"); + } else if (!gethostname(hostname + sizeof(HOSTNAME_PREFIX) - 1, + HOST_NAME_MAX + 1 - sizeof(HOSTNAME_PREFIX)) || + errno == ENAMETOOLONG) { hostname[HOST_NAME_MAX] = '\0'; if (sethostname(hostname, strlen(hostname))) warn("Unable to set pasta-prefixed hostname"); @@ -208,7 +215,6 @@ static int pasta_spawn_cmd(void *arg) sigaddset(&set, SIGUSR1); sigwaitinfo(&set, NULL); - a = (const struct pasta_spawn_cmd_arg *)arg; execvp(a->exe, a->argv); die_perror("Failed to start command or shell"); @@ -230,6 +236,7 @@ void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid, struct pasta_spawn_cmd_arg arg = { .exe = argv[0], .argv = argv, + .c = c, }; char uidmap[BUFSIZ], gidmap[BUFSIZ]; char *sh_argv[] = { NULL, NULL }; @@ -310,7 +317,7 @@ void pasta_ns_conf(struct ctx *c) if (c->pasta_conf_ns) { unsigned int flags = IFF_UP; - if (c->mtu != -1) + if (c->mtu) nl_link_set_mtu(nl_sock_ns, c->pasta_ifi, c->mtu); if (c->ifi6) /* Avoid duplicate address detection on link up */ @@ -489,17 +496,23 @@ void pasta_netns_quit_init(const struct ctx *c) */ void pasta_netns_quit_inotify_handler(struct ctx *c, int inotify_fd) { - char buf[sizeof(struct inotify_event) + NAME_MAX + 1]; - const struct inotify_event *in_ev = (struct inotify_event *)buf; + char buf[sizeof(struct inotify_event) + NAME_MAX + 1] + __attribute__ ((aligned(__alignof__(struct inotify_event)))); + const struct inotify_event *ev; + ssize_t n; + char *p; - if (read(inotify_fd, buf, sizeof(buf)) < (ssize_t)sizeof(*in_ev)) + if ((n = read(inotify_fd, buf, sizeof(buf))) < (ssize_t)sizeof(*ev)) return; - if (strncmp(in_ev->name, c->netns_base, sizeof(c->netns_base))) - return; + for (p = buf; p < buf + n; p += sizeof(*ev) + ev->len) { + ev = (const struct inotify_event *)p; - info("Namespace %s is gone, exiting", c->netns_base); - _exit(EXIT_SUCCESS); + if (!strncmp(ev->name, c->netns_base, sizeof(c->netns_base))) { + info("Namespace %s is gone, exiting", c->netns_base); + _exit(EXIT_SUCCESS); + } + } } /** |