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qubes-restore: some syscall error checking

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This commit is contained in:
Vincent Penquerc'h 2013-12-30 09:15:55 -05:00 committed by Marek Marczykowski-Górecki
parent 8c7a5e5933
commit 2cf4ad18eb
1 changed files with 30 additions and 6 deletions
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36
dispvm/qubes-restore.c
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@ -207,7 +207,10 @@ char *get_vmname_from_savefile(int fd)
static char buf[4096];
char *name;
char *slash;
lseek(fd, 0, SEEK_SET);
if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
perror("lseek vm conf");
exit(1);
}
buflen = read(fd, buf, sizeof(buf) - 1);
if (buflen < 0) {
perror("read vm conf");
@ -260,7 +263,10 @@ void fix_conffile(FILE *conf, int conf_templ, int dispid, int netvm_id)
char *pattern, *patternend;
/* read config template */
lseek(conf_templ, 0, SEEK_SET);
if (lseek(conf_templ, 0, SEEK_SET) == (off_t)-1) {
perror("lseek vm conf");
exit(1);
}
while ((cur_len = read(conf_templ, buf+cur_len, sizeof(buf)-cur_len)) > 0) {
buflen+=cur_len;
}
@ -358,9 +364,18 @@ int get_netvm_id_from_name(char *name)
exit(1);
}
n = read(fd, netvm_id, sizeof(netvm_id) - 1);
if (n < 0) {
perror("read netvm_id");
exit(1);
}
close(fd);
netvm_id[n] = 0;
return atoi(netvm_id);
n = atoi(netvm_id);
if (n == 0) {
fprintf(stderr, "bad netvm id\n");
exit(1);
}
return n;
}
void setup_xenstore(int netvm_id, int domid, int dvmid, char *name)
@ -400,10 +415,19 @@ int get_next_disposable_id()
perror("open dispVM.seq");
exit(1);
}
read(fd, &seq, sizeof(seq));
if (read(fd, &seq, sizeof(seq)) != sizeof(seq)) {
perror("read dispVM.seq");
exit(1);
}
seq++;
lseek(fd, 0, SEEK_SET);
write(fd, &seq, sizeof(seq));
if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
perror("seek dispVM.seq");
exit(1);
}
if (write(fd, &seq, sizeof(seq)) != sizeof(seq)) {
perror("write dispVM.seq");
exit(1);
}
close(fd);
return seq;
}