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ldn: Use fixed-size buffer for sendto(), and make sure the data from recvfrom() is NUL-terminated.

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yellows8 2020-05-24 15:50:22 -04:00
parent 52bdce1eb0
commit 25cdf12ab0
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1 changed files with 2 additions and 1 deletions
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network/ldn/source/main.c
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@ -291,7 +291,7 @@ int main(int argc, char **argv)
else if (kDown & KEY_DUP) strncpy(tmpstr, "Button DUP pressed.", sizeof(tmpstr)-1); else if (kDown & KEY_DUP) strncpy(tmpstr, "Button DUP pressed.", sizeof(tmpstr)-1);
else if (kDown & KEY_DDOWN) strncpy(tmpstr, "Button DDOWN pressed.", sizeof(tmpstr)-1); else if (kDown & KEY_DDOWN) strncpy(tmpstr, "Button DDOWN pressed.", sizeof(tmpstr)-1);
ssize_t ret = sendto(sockfd, tmpstr, strlen(tmpstr), 0, (struct sockaddr*) &serv_addr, sizeof(struct sockaddr_in)); ssize_t ret = sendto(sockfd, tmpstr, sizeof(tmpstr), 0, (struct sockaddr*) &serv_addr, sizeof(struct sockaddr_in));
int tmp = errno; int tmp = errno;
printf("sendto(): %ld", ret); printf("sendto(): %ld", ret);
if (ret < 0) printf(", %s", strerror(tmp)); if (ret < 0) printf(", %s", strerror(tmp));
@ -306,6 +306,7 @@ int main(int argc, char **argv)
socklen_t fromlen = sizeof(struct sockaddr_in); socklen_t fromlen = sizeof(struct sockaddr_in);
ssize_t ret = recvfrom(sockfd, tmpstr, sizeof(tmpstr), MSG_DONTWAIT, (struct sockaddr*) &src_addr, &fromlen); ssize_t ret = recvfrom(sockfd, tmpstr, sizeof(tmpstr), MSG_DONTWAIT, (struct sockaddr*) &src_addr, &fromlen);
tmpstr[sizeof(tmpstr)-1] = 0;
if (ret>0) printf("Received data: %s\n", tmpstr); if (ret>0) printf("Received data: %s\n", tmpstr);
} }